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Studies on CeO2-based Aerogel Catalysts Used for Preferential Oxidation of Carbon Monoxide in Excess Hydrogen

Author: LiJian
Tutor: BaiXue
School: Inner Mongolia University of Technology
Course: Industrial Catalysis
Keywords: Selective oxidation Carbon monoxide Aerogel Cerium oxide Rare earths
CLC: O643.36
Type: Master's thesis
Year: 2007
Downloads: 85
Quote: 1
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Abstract


In recent years, due to the important status of fuel cell technology on the environment and the potential application of the selective oxidation catalyst in the fuel cell, the research and development of such catalysts increasingly attention. This work was prepared by supercritical drying method of Ce O2 Zr, Ce x 1-x O2 and Ce < sub> 0.49 Zr 0.49 RE0.02 O2 (RE = La, Sm, Pr) airgel ultrafine powder, and carrier impregnated Preparation of CuO / Ce O2 CuO / Ce x the Zr -x the O2 CuO / Ce < sub> 0.49 Zr , RE , 0.49 0.02 O 2 (RE = La, Sm, Pr) catalyst; atmospheric pressure and analog investigated the catalytic activity of the catalyst, selective, anti-C O2 and H2O performance proton exchange membrane fuel cell feed gas conditions; H2-TPR (H2-TPR), X-ray diffraction analysis (XRD) of the catalysts were characterized by BET (SBET) test method. Experimental results show that: were prepared by impregnation of CeO 2 aerogels supported CuO catalyst (12 wt%) of CuO / CeO 2 applied to the catalytic oxidation of CO in the hydrogen-rich showed high activity and selectivity; of CuO and CeO 2 strong interaction between the results of its role in the Cu species in CeO 2 surface is highly fragmented, Moreover, there are different species of copper on the catalyst surface, the existence of these different copper species to promote the performance of the catalyst is the catalytic oxidation of CO CeXZr 1-X O 2 aerogels supported CuO catalyst CuO/CexZr1-X O2 series of catalysts were prepared by impregnation, the the catalytic activity of CuO / Ce O2 has not improved significantly, but its selective anti-H2O and C O2 performance improved to varying degrees. This may be because the zirconium added to change the vector nature of the interaction between the carrier and copper changed, affects the activity of the catalyst. Prepared by impregnation and adding rare earth elements La, Sm, Pr of Ce 0.98 RE 0.02 O 2 Ce 0.49 the Zr 0.49 RE0.02 O2 CuO airgel supported catalyst that CuO / Ce 0.98 RE 0.02 the O 2 and CuO / Ce , 0.49 Zr 0.49 RE0.02 O2 , the experimental results show that the rare earth component La Sm, the Pr to join and CuO / CeO 2 CO selective oxidation catalytic activity decreased compared, but La, Sm added to improve its anti-CO 2 Performance play a role.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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