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Review on the two-step-conversion of CO2 driven by solar energy
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0002-2992-6814
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2013 (English)In: The Journal of Macro Trends in Energy and Sustainability, ISSN 2333-0511, Vol. 1, no 1Article in journal (Refereed) Published
Abstract [en]

The catalytic conversions of CO2 and H2O emerge as an attractive way to recycle CO2 and H2O to provide synthesis gas as an alternative fuel. Two-step-conversion method with catalysts shows a better performance among different techniques for converting CO2. Solar energy is highly interesting for researchers since it is renewable, feasible and abundant. This article reviews the different aspects of two-step-conversion of CO2 driven by solar energy, including the catalysts used for conversions, and the conversion systems with solar energy. The article focuses on ceria (CeO2) as the promising catalyst, and the looping circulating fluidized bed as the reactors for conversion systems with the prospect. The factors affecting the gas-solid interaction in fluidization are also reviewed. As the conclusion, the two-step conversion of CO2 driven by solar energy appears competitive and ceria gets advantages among the involved catalysts.

Place, publisher, year, edition, pages
2013. Vol. 1, no 1
Keyword [en]
Thermochemical, Two - step, CO2 conversion, Solar energy, Fluidization, Ceria
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-153641OAI: oai:DiVA.org:kth-153641DiVA: diva2:752785
Note

QC 20141006

Available from: 2014-10-06 Created: 2014-10-06 Last updated: 2017-01-13Bibliographically approved
In thesis
1. A novel solar-driven system for two-step conversion of CO2 with ceria-based catalysts
Open this publication in new window or tab >>A novel solar-driven system for two-step conversion of CO2 with ceria-based catalysts
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Global warming is an unequivocal fact proved by the persistent rise of the average temperature of the earth. IPCC reported that scientists were more than 90 % certain that most of the global warming was caused by increasing concentrations of greenhouse gases (GHG) produced by human activities. One alternative to combat the GHG is to explore technologies for utilizing CO2 already generated by current energy systems and develop methods to convert CO2 into useful combustible gases.

Two-step conversion of CO2 with catalysts is one of the most promising methods. Ceria (CeO2) is chosen as the main catalyst for this conversion in the thesis. It releases O2 when it is reduced in a heating process, and then absorbs O2 from CO2 to produce CO when it is re-oxidized in a cooling process.

To make the conversion economic, solar power is employed to drive the conversion system. In this thesis, a flexible system with fluidized bed reactors (FBRs) is introduced.

The thermogravimetric analysis (TGA) was carried out to examine the performance of ceria during its reduction and oxidation. Subsequently, the exergy analysis was used to evaluate the system’s capability on exporting work. The theoretical fuel to chemical efficiency varied from 4.85 % to 43.2 % for CO2 conversions.

To investigate the operation mechanism of the system, a mathematical model was built up for the dynamic simulation of the system. Variables such as temperatures and efficiencies were calculated and recorded for different cases. The optimum working condition was found out to be at 1300 ⁰C for the commercial type of ceria.

Finally, an experimental system was set up. The hydrodynamics and heat transfer in the fluidized bed reactor were studied. A CFD model was built up and validated with the experimental trials around 120 ⁰C. The model was then used as a reliable tool for the optimization of the reactor.

The entire work in the thesis follows the procedure of developing an engineering system. It forms a solid basis for further improvements of the system to recycle CO2.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xxv, 159 p.
Series
TRITA-KRV, ISSN 1100-7990 ; 14:05
Keyword
CO2 conversion, solar, ceria, thermogravimetric test, exergy analysis, simulink, fluidized bed, gas-solid flow, simulation
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-152899 (URN)978-91-7595-285-7 (ISBN)
Public defence
2014-10-24, Sal M235 (Learning Theatre), Brinellvägen 68, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20141006

Available from: 2014-10-06 Created: 2014-10-02 Last updated: 2014-10-06Bibliographically approved

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