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Microemulsion-prepared Ni catalysts supported on cerium-lanthanum oxide for the selective catalytic oxidation of ammonia in gasified biomass
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
2006 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 64, no 02-jan, 96-102 p.Article in journal (Refereed) Published
Abstract [en]

Nickel (Ni) catalysts supported on cerium-lanthanum oxide were prepared by two different preparation techniques and have been tested in the temperature range of 500-750 degrees C for selective catalytic oxidation of ammonia to nitrogen in gasified biomass. The two different catalyst preparation methods used are the conventional and the microemulsion (water-in-oil). The effect on catalytic activity of different Ni loadings was also tested in combination with the preparation method. Catalyst characterisation was focused on BET and XRD analysis. Cordierite monoliths were used in a tubular quartz reactor for the purpose of the activity tests. For simulating the gasified biomass fuel, 400 ppm NH3 was added to the fuel. Water was also present during the activity tests, which were carried out at fuel rich conditions. Results showed that the microemulsion-prepared catalysts obtained higher performance than the conventional ones, with the best catalyst reaching 98% ammonia conversion and 99% nitrogen selectivity at 750 degrees C. The more the Ni supported on the catalyst, the higher the catalytic activity. Constant conversion and negligible carbon deposition were two other important characteristics for the microemulsion-prepared catalysts.

Place, publisher, year, edition, pages
2006. Vol. 64, no 02-jan, 96-102 p.
Keyword [en]
microemulsion, selective catalytic oxidation, gasified biomass, ammonia conversion, nitrogen selectivity, gasification gas, nh3, temperature, nitrogen, pressure, n-2
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-15619DOI: 10.1016/j.apcatb.2005.10.024ISI: 000236926700013Scopus ID: 2-s2.0-33645242386OAI: oai:DiVA.org:kth-15619DiVA: diva2:333661
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Nanomaterials for membranes and catalysts
Open this publication in new window or tab >>Nanomaterials for membranes and catalysts
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Nanotechnology is a relatively new research topic that attracts increasing interest from scientists and engineers all over the world, due to its novel applications. The use of nanomaterials has extended to a broad range of applications, for example chemical synthesis, microporous media synthesis and catalytic combustion, contributing to achievement of improved or promising results. Microemulsion (ME) is considered a powerful tool for synthesis of nanomaterials, due to its unique properties. This thesis concentrates on the use of the ME as a catalyst synthesis route for obtaining metal nanoparticles for two challenging concepts: Hydrogen production by a membrane reactor and selective catalytic oxidation (SCO) of ammonia in gasified biomass.

Particularly for the scope of the fist concept presented in this thesis, palladium nanoparticles were synthesised from ME in order to be deposited on zeolite composite membranes to improve the H2 / CO2 separation (hydrogen production) ability. The membranes impregnated with Pd nanoparticles were then tested in a metal reactor for the permeance and selectivity towards H2 and CO2. Regarding the second concept, cerium-lanthanum oxide nanoparticles were prepared by conventional methods and from ME in order to be tested for their activity towards SCO of ammonia in gasified biomass.

The environmental importance of these two applications under investigation is great, since both are involved in processes contributing to the minimisation of the harmful exhaust gases released to the atmosphere from numerous industrial applications, such as the oil industry and heat-and-power production (for example combustion of natural gas or biomass in a gas turbine cycle). Regarding these applications, separation and capture of CO2 from exhaust gases and oxidation of the fuel-bound ammonia in gasified biomass directly to nitrogen, minimising at the same time NOx formation, are rated as very important technologies. The results obtained from this work and presented analytically in this thesis are considered successful and at the same time promising, since further research on the ME method can even lead to improvement of the current achievements.

The first part (Chapter 2) of the thesis gives a general background on the ME method and the applications in the two concepts under investigation. Additionally, it describes how the nanoparticles corresponding to the concepts were synthesised.

The second part (Chapter 3) of the thesis describes the different Pd-nanoparticle impregnation methods on the zeolite composite membranes and the results obtained form the permeation tests. In parallel with impregnation methods, various aspects that affect the Pd impregnation efficiency and the membrane performance such as duration, temperature and calcination conditions are discussed thoroughly.

The third and final part of the thesis (Chapter 4) concerns the preparation of the cerium-lanthanum oxide catalysts and the activity tests (under simulated gasified biomass fuel conditions) carried out in order to monitor the activity of these catalysts towards the SCO of ammonia. Additionally, a comparison of the activity between identical catalysts prepared by conventional methods and the ME method is discussed.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 56 p.
Series
Trita-KET, ISSN 1104-3466 ; 220
Keyword
nanotechnology, microemulsion, nanoparticles, hydrogen production, CO2 capture, selective catalytic oxidation of ammonia, activity, gasified biomass
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-446 (URN)
Presentation
2005-10-07, sammanträdesrummet 591, Teknikringen 42, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101216Available from: 2005-09-29 Created: 2005-09-29 Last updated: 2010-12-16Bibliographically approved

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