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Shi, Ziyi
Publications (10 of 16) Show all publications
Jin, Y., Liu, S., Shi, Z., Wang, S., Wen, Y., Zaini, I. N., . . . Yang, W. (2024). A novel three-stage ex-situ catalytic pyrolysis process for improved bio-oil yield and quality from lignocellulosic biomass. Energy, 295, Article ID 131029.
Open this publication in new window or tab >>A novel three-stage ex-situ catalytic pyrolysis process for improved bio-oil yield and quality from lignocellulosic biomass
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2024 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 295, article id 131029Article in journal (Refereed) Published
Abstract [en]

This study aims to improve the quality and yield of bio-oil produced from ex-situ catalytic pyrolysis of lignocellulosic biomass (sawdust) using a combination of stage catalysts with Al-MCM-41, HZSM-5, and ZrO2. The research employed various methods, including thermogravimetric analysis (TGA), differential scanning calorimetry, bench-scale experiments, and process simulations to analyze the kinetics, thermodynamics, products, and energy flows of the catalytic upgrading process. The introduction of ZrO2 enhances the yield of monoaromatic hydrocarbons (MAHs) in heavy organics. Compared with the dual-catalyst case, the MAHs yield escalates by approximately 344% at a catalyst ratio of 1:3:0.25. Additionally, GC-MS data indicate that the incorporation of ZrO2 promotes the deoxygenation reaction of the guaiacol compound and the oligomerization reactions of PAHs. The integration of ZrO2 as the third catalyst enhances the yield of heavy organics significantly, achieving 16.85% at a catalyst ratio of 1:3:1, which increases by nearly 35.6% compared to the dual-catalyst case. Also, the addition of ZrO2 as the third catalyst enhanced the energy distribution in heavy organics. These findings suggest that the combination of these catalysts improves the fuel properties and yields of the bio-oil.

Place, publisher, year, edition, pages
Elsevier Ltd, 2024
Keywords
Bio-oil, Process simulation, Pyrolysis, Staged catalyst, TGA
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-344932 (URN)10.1016/j.energy.2024.131029 (DOI)001224241400001 ()2-s2.0-85188595056 (Scopus ID)
Note

QC 20240524

Available from: 2024-04-03 Created: 2024-04-03 Last updated: 2024-05-24Bibliographically approved
Shi, Z., Jin, Y., Han, T., Yang, H., Gond, R., Subasi, Y., . . . Yang, W. (2024). Bio-based anode material production for lithium–ion batteries through catalytic graphitization of biochar: the deployment of hybrid catalysts. Scientific Reports, 14(1), Article ID 3966.
Open this publication in new window or tab >>Bio-based anode material production for lithium–ion batteries through catalytic graphitization of biochar: the deployment of hybrid catalysts
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2024 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 14, no 1, article id 3966Article in journal (Refereed) Published
Abstract [en]

Producing sustainable anode materials for lithium-ion batteries (LIBs) through catalytic graphitization of renewable biomass has gained significant attention. However, the technology is in its early stages due to the bio-graphite's comparatively low electrochemical performance in LIBs. This study aims to develop a process for producing LIB anode materials using a hybrid catalyst to enhance battery performance, along with readily available market biochar as the raw material. Results indicate that a trimetallic hybrid catalyst (Ni, Fe, and Mn in a 1:1:1 ratio) is superior to single or bimetallic catalysts in converting biochar to bio-graphite. The bio-graphite produced under this catalyst exhibits an 89.28% degree of graphitization and a 73.95% conversion rate. High-resolution transmission electron microscopy (HRTEM) reveals the dissolution–precipitation mechanism involved in catalytic graphitization. Electrochemical performance evaluation showed that the trimetallic hybrid catalyst yielded bio-graphite with better electrochemical performances than those obtained through single or bimetallic hybrid catalysts, including a good reversible capacity of about 293 mAh g−1 at a current density of 20 mA/g and a stable cycle performance with a capacity retention of over 98% after 100 cycles. This study proves the synergistic efficacy of different metals in catalytic graphitization, impacting both graphite crystalline structure and electrochemical performance.

Place, publisher, year, edition, pages
Springer Nature, 2024
Keywords
Bio-graphite, Biochar, Catalytic graphitization, Lithium-ion battery, Pyrolysis
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-344002 (URN)10.1038/s41598-024-54509-8 (DOI)38368434 (PubMedID)2-s2.0-85185354006 (Scopus ID)
Note

QC 20240229

Available from: 2024-02-28 Created: 2024-02-28 Last updated: 2024-02-29Bibliographically approved
Yang, H., Zaini, I. N., Pan, R., Jin, Y., Wang, Y., Li, L., . . . Han, T. (2024). Distributed electrified heating for efficient hydrogen production. Nature Communications, 15(1), Article ID 3868.
Open this publication in new window or tab >>Distributed electrified heating for efficient hydrogen production
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2024 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 15, no 1, article id 3868Article in journal (Refereed) Published
Abstract [en]

This study introduces a distributed electrified heating approach that is able to innovate chemical engineering involving endothermic reactions. It enables rapid and uniform heating of gaseous reactants, facilitating efficient conversion and high product selectivity at specific equilibrium. Demonstrated in catalyst-free CH4 pyrolysis, this approach achieves stable production of H2 (530 g h−1 L reactor−1) and carbon nanotube/fibers through 100% conversion of high-throughput CH4 at 1150 °C, surpassing the results obtained from many complex metal catalysts and high-temperature technologies. Additionally, in catalytic CH4 dry reforming, the distributed electrified heating using metallic monolith with unmodified Ni/MgO catalyst washcoat showcased excellent CH4 and CO2 conversion rates, and syngas production capacity. This innovative heating approach eliminates the need for elongated reactor tubes and external furnaces, promising an energy-concentrated and ultra-compact reactor design significantly smaller than traditional industrial systems, marking a significant advance towards more sustainable and efficient chemical engineering society.

Place, publisher, year, edition, pages
Nature Research, 2024
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-346497 (URN)10.1038/s41467-024-47534-8 (DOI)38719793 (PubMedID)2-s2.0-85192354703 (Scopus ID)
Note

QC 20240517

Available from: 2024-05-16 Created: 2024-05-16 Last updated: 2024-05-17Bibliographically approved
Jin, Y., Yang, H., Guo, S., Shi, Z., Han, T., Gond, R., . . . Yang, W. (2023). Carbon and H-2 recoveries from plastic waste by using a metal-free porous biocarbon catalyst. Journal of Cleaner Production, 404, Article ID 136926.
Open this publication in new window or tab >>Carbon and H-2 recoveries from plastic waste by using a metal-free porous biocarbon catalyst
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2023 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 404, article id 136926Article in journal (Refereed) Published
Abstract [en]

Carbon and H2 recoveries from plastic waste enable high value-added utilizations of plastic waste while mini-mizing its GHG emissions. The objective of this study is to explore the use of a metal-free biocarbon catalyst for waste plastic pyrolysis and in-line catalytic cracking to produce H2-rich gases and carbon. The results show that the biocarbon catalyst exhibits a good catalytic effect and stability for various plastic wastes. Increasing the C/P ratio from 0 to 2, induce an increase in the conversion rate of C and H in plastics to carbon and H2 from 57.1% to 68.7%, and from 22.7% to 53.5%, respectively. Furthermore, a carbon yield as high as 580.6 mg/gplastic and an H2 yield as high as 68.6 mg/gplastic can be obtained. The hierarchical porous structure with tortuous channels of biocarbon extends the residence time of pyrolysis volatiles in the high-temperature catalytic region and thereby significantly promotes cracking reactions.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Biocarbon catalyst, Plastic pyrolysis, Hydrogen, Catalytic cracking
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-327174 (URN)10.1016/j.jclepro.2023.136926 (DOI)000971689600001 ()2-s2.0-85151275989 (Scopus ID)
Note

QC 20230524

Available from: 2023-05-24 Created: 2023-05-24 Last updated: 2023-11-03Bibliographically approved
Shi, Z., Jin, Y., Svanberg, R., Han, T., Minidis, A. B. E., Ann-Sofi, K. D., . . . Yang, W. (2023). Continuous catalytic pyrolysis of biomass using a fluidized bed with commercial-ready catalysts for scale-up. Energy, 273, Article ID 127288.
Open this publication in new window or tab >>Continuous catalytic pyrolysis of biomass using a fluidized bed with commercial-ready catalysts for scale-up
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2023 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 273, article id 127288Article in journal (Refereed) Published
Abstract [en]

The use of catalytic fast pyrolysis (CFP) of biomass to produce high-quality bio-oils as potential substitutes for conventional fuels plays an essential role in the decarbonization of the world. In this study, continuous CFP tests of sawdust using three commercial-ready catalysts were performed. The overall objective is to screen appropriate catalysts and catalyst loading amounts for further commercialization and upgrading by evaluating the quality of the organic fraction bio-oils and clarifying the relationship between the hydrogen-to-carbon atomic effective (H/ Ceff) ratio and bio-oil yield. The results displayed that, owing to a cracking effect of the catalyst, all catalytic cases had higher H/Ceff ratios and larger relative area percentages of hydrocarbons determined by NMR. Thermogravimetric analysis reveals that, compared to non-catalytic bio-oils, catalytic bio-oils showed more distillates in the diesel range. Increasing the catalyst-loading amount also showed the same effect. Overall, all bio-oil products from catalytic cases had H/Ceff ratios higher than 0.6, indicating the production of promising oil for hydrodeoxygenation. By analyzing and fitting the data from this work and comparing with the literature, it could be concluded that its yield would decrease as the bio-oil product quality increases (the H/Ceff ratios increase).

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Biomass, Bio-oil, Catalytic fast pyrolysis, The hydrogen-to-carbon atomic effective ratio
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-326644 (URN)10.1016/j.energy.2023.127288 (DOI)000965087900001 ()2-s2.0-85150893147 (Scopus ID)
Note

QC 20230509

Available from: 2023-05-09 Created: 2023-05-09 Last updated: 2023-05-09Bibliographically approved
Jin, Y., Shi, Z., Han, T., Yang, H., Asfaw, H. D., Gond, R., . . . Yang, W. (2023). From Waste Biomass to Hard Carbon Anodes: Predicting the Relationship between Biomass Processing Parameters and Performance of Hard Carbons in Sodium-Ion Batteries. Processes, 11(3), Article ID 764.
Open this publication in new window or tab >>From Waste Biomass to Hard Carbon Anodes: Predicting the Relationship between Biomass Processing Parameters and Performance of Hard Carbons in Sodium-Ion Batteries
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2023 (English)In: Processes, ISSN 2227-9717, Vol. 11, no 3, article id 764Article, review/survey (Refereed) Published
Abstract [en]

Sodium-ion batteries (SIBs) serve as the most promising next-generation commercial batteries besides lithium-ion batteries (LIBs). Hard carbon (HC) from renewable biomass resources is the most commonly used anode material in SIBs. In this contribution, we present a review of the latest progress in the conversion of waste biomass to HC materials, and highlight their application in SIBs. Specifically, the following topics are discussed in the review: (1) the mechanism of sodium-ion storage in HC, (2) the HC precursor's sources, (3) the processing methods and conditions of the HCs production, (4) the impact of the biomass types and carbonization temperature on the carbon structure, and (5) the effect of various carbon structures on electrochemical performance. Data from various publications have been analyzed to uncover the relationship between the processing conditions of biomass and the resulting structure of the final HC product, as well as its electrochemical performance. Our results indicate the existence of an ideal temperature range (around 1200 to 1400 degrees C) that enhances the formation of graphitic domains in the final HC anode and reduces the formation of open pores from the biomass precursor. This results in HC anodes with high storage capacity (>300 mAh/g) and high initial coulombic efficiency (ICE) (>80%).

Place, publisher, year, edition, pages
MDPI AG, 2023
Keywords
waste biomass, hard carbon, sodium ion batteries, sodium-ion storage, anode material
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-326634 (URN)10.3390/pr11030764 (DOI)000967839300001 ()2-s2.0-85151727689 (Scopus ID)
Note

QC 20230509

Available from: 2023-05-09 Created: 2023-05-09 Last updated: 2023-05-09Bibliographically approved
Wang, S., Wang, Y., Shi, Z., Sun, K., Wen, Y., Niedzwiecki, L., . . . Wang, C. H. (2023). Van Krevelen diagrams based on machine learning visualize feedstock-product relationships in thermal conversion processes. Communications Chemistry, 6(1), Article ID 273.
Open this publication in new window or tab >>Van Krevelen diagrams based on machine learning visualize feedstock-product relationships in thermal conversion processes
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2023 (English)In: Communications Chemistry, E-ISSN 2399-3669, Vol. 6, no 1, article id 273Article in journal (Refereed) Published
Abstract [en]

Feedstock properties play a crucial role in thermal conversion processes, where understanding the influence of these properties on treatment performance is essential for optimizing both feedstock selection and the overall process. In this study, a series of van Krevelen diagrams were generated to illustrate the impact of H/C and O/C ratios of feedstock on the products obtained from six commonly used thermal conversion techniques: torrefaction, hydrothermal carbonization, hydrothermal liquefaction, hydrothermal gasification, pyrolysis, and gasification. Machine learning methods were employed, utilizing data, methods, and results from corresponding studies in this field. Furthermore, the reliability of the constructed van Krevelen diagrams was analyzed to assess their dependability. The van Krevelen diagrams developed in this work systematically provide visual representations of the relationships between feedstock and products in thermal conversion processes, thereby aiding in optimizing the selection of feedstock and the choice of thermal conversion technique.

Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-341602 (URN)10.1038/s42004-023-01077-z (DOI)001122502600001 ()2-s2.0-85179331588 (Scopus ID)
Note

QC 20231227

Available from: 2023-12-27 Created: 2023-12-27 Last updated: 2024-02-29Bibliographically approved
Wang, S., Shi, Z., Jin, Y., Zaini, I. N., Li, Y., Tang, C., . . . Jönsson, P. G. (2022). A machine learning model to predict the pyrolytic kinetics of different types of feedstocks. Energy Conversion and Management, 260, 115613, Article ID 115613.
Open this publication in new window or tab >>A machine learning model to predict the pyrolytic kinetics of different types of feedstocks
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2022 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 260, p. 115613-, article id 115613Article in journal (Refereed) Published
Abstract [en]

An in-depth knowledge of pyrolytic kinetics is vital for understanding the thermal decomposition process. Numerous experimental studies have investigated the kinetic performance of the pyrolysis of different raw materials. An accurate prediction of pyrolysis kinetics could substantially reduce the efforts of researchers and decrease the cost of experiments. In this work, a model to predict the mean values of model-free activation energies of pyrolysis for five types of feedstocks was successfully constructed using the random forest machine learning method. The coefficient of determination of the fitting result reached a value as high as 0.9964, which indicates significant potential for making a quick initial pyrolytic kinetic estimation using machine learning methods. Specifically, from the results of a partial dependence analysis of the lignocellulose-type feedstock, the atomic ratios of H/C and O/C were found to have negative correlations with the pyrolytic activation energies. However, the effect of the ash content on the activation energy strongly depended on the organic component species present in the lignocellulose feedstocks. This work confirms the possibility of predicting model-free pyrolytic activation energies by utilizing machine learning methods, which can improve the efficiency and understanding of the kinetic analysis of pyrolysis for biomass and fossil investigations.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Pyrolysis, Machine learning, Random forest, Kinetics, Prediction
National Category
Computer Sciences Bioprocess Technology
Identifiers
urn:nbn:se:kth:diva-313738 (URN)10.1016/j.enconman.2022.115613 (DOI)000801918600002 ()2-s2.0-85128461436 (Scopus ID)
Note

QC 20220613

Available from: 2022-06-13 Created: 2022-06-13 Last updated: 2022-06-25Bibliographically approved
Wang, S., Wen, Y., Shi, Z., Niedzwiecki, L., Baranowski, M., Czerep, M., . . . Yang, W. (2022). Effect of hydrothermal carbonization pretreatment on the pyrolysis behavior of the digestate of agricultural waste: A view on kinetics and thermodynamics. Chemical Engineering Journal, 431, 133881, Article ID 133881.
Open this publication in new window or tab >>Effect of hydrothermal carbonization pretreatment on the pyrolysis behavior of the digestate of agricultural waste: A view on kinetics and thermodynamics
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2022 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 431, p. 133881-, article id 133881Article in journal (Refereed) Published
Abstract [en]

Anaerobic digestion is the most promising disposal methods to treat organic waste. Also, a feasible management is necessary for the resulted digestate. Hydrothermal carbonization (HTC) combination with pyrolysis could be a proper solution to use for the treatment of digestate. In this study, the effect of an HTC on the pyrolysis of the digestate of agricultural waste (AWD) was investigated, focusing on the kinetic and thermodynamic aspects. Three model-free methods, including Friedman, KAS, and OFW methods, were used to evaluate the kinetic performance of the total and pseudo pyrolytic reactions of AWD and its hydrochar. Furthermore, kinetic predictions were made to provide more information for further studies. It was found that the HTC treatment decreased the activation energy ranges of the pyrolysis of AWD from 182.9-274.43 kJ/mol to 144.59-205.20 kJ/mol by using the Friedman method. For a more thorough understanding of the effect of HTC treatment on the pyrolysis of AWD, the pyrolysis reactions of AWD and its hydrochar were divided into two pseudoreactions using the Fraser-Suzuki deconvolution method. The mean activation energy of the deduced pseudo 2 pyrolytic reaction of hydrochar was 175.64 kJ/mol, which was 28.11 kJ/mol less than that of AWD. In addition, the Delta H(double dagger )values of the pseudo 2 reactions of AWD and its hydrochar were 197.97 and 169.68 kJ/mol, respectively. The results of kinetic isothermal predictions suggested that the peak temperature for the further research and application of the pyrolysis of AWD and its hydmchar should not be lower than 450 degrees C.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Agricultural waste, Anaerobic digestion, Hydrothermal carbonization, Pyrolysis, Kinetics and thermodynamics, Kinetic prediction
National Category
Bioenergy Other Chemistry Topics Energy Engineering
Identifiers
urn:nbn:se:kth:diva-306765 (URN)10.1016/j.cej.2021.133881 (DOI)000729447000005 ()2-s2.0-85120493301 (Scopus ID)
Note

QC 20211230

Available from: 2021-12-30 Created: 2021-12-30 Last updated: 2022-09-27Bibliographically approved
Wen, Y., Wang, S., Shi, Z., Zaini, I. N., Niedzwiecki, L., Aragon-Briceno, C., . . . Yang, W. (2022). H2-rich syngas production from pyrolysis of agricultural waste digestate coupled with the hydrothermal carbonization process. Energy Conversion and Management, 269, 116101-116101, Article ID 116101.
Open this publication in new window or tab >>H2-rich syngas production from pyrolysis of agricultural waste digestate coupled with the hydrothermal carbonization process
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2022 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 269, p. 116101-116101, article id 116101Article in journal (Refereed) Published
Abstract [en]

A novel process to produce a H2-rich syngas from a high moisture-containing agricultural waste digestate is proposed. This process combines the use of hydrothermal carbonization (HTC), dewatering, pyrolysis, and catalytic reforming. Due to the feature of the high moisture content in the digestate, the effect of the HTC and dewatering on the process performance is of interest, and four scenarios were considered. Furthermore, three pyrolytic temperatures were chosen to understand the effect of pyrolysis conditions on the produced H2-rich syngas. A life cycle assessment was conducted to investigate the environmental impact of the proposed process. Results show that the application of HTC technology, increases the process efficiency, produces less syngas from one ton of digestate, lowers the cumulative energy demand and the negative carbon emissions. When the dewatering technology is used, the syngas yield is promoted but the H2 concentration in the syngas is reduced. The H2 to CO molar ratio reaches the maximum value of 9.2 when using a 450 ˚C pyrolysis temperature, by only using HTC. When the combining process of HTC and dewatering is used, it results in the highest process efficiency, but the smallest relative negative CO2 equivalent emissions by treating one ton of dry digestate.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Advanced biofuel, Agricultural waste digestate, Green hydrogen, Life cycle assessment, Pyrolysis
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-319112 (URN)10.1016/j.enconman.2022.116101 (DOI)000861078700001 ()2-s2.0-85136146236 (Scopus ID)
Funder
Swedish Research Council FormasSwedish Research CouncilEuropean CommissionSwedish Research Council FormasSwedish Research CouncilEuropean Commission
Note

QC 20221003

Available from: 2022-09-26 Created: 2022-09-26 Last updated: 2023-09-21Bibliographically approved
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