Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO2 Catalysts at Low Temperature

Catalysts

A. Jeremy Kropf¹  Donald C. Cronauer¹  Caleb D. Watson²  Zahra Rajabi²  Li Jones²  Gary Jacobs²  Michela Martinelli³  Dali Qian⁴ 

[1] Argonne National Laboratory, Lemont, IL 60439, USA;Department of Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA;University of Kentucky Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, USA;University of Kentucky Electron Microscopy Center, University of Kentucky, ASTeCC Building—Room A004, Lexington, KY 40508, USA;

关键词: ethanol steam reforming (ESR);    DRIFTS;    Cs doping;    zirconia;    decarboxylation;    decarbonylation;   

DOI  :  10.3390/catal11091104

来源: DOAJ

【 摘 要 】

The decarboxylation pathway in ethanol steam reforming ultimately favors higher selectivity to hydrogen over the decarbonylation mechanism. The addition of an optimized amount of Cs to Pt/m-ZrO₂ catalysts increases the basicity and promotes the decarboxylation route, converting ethanol to mainly H₂, CO₂, and CH₄ at low temperature with virtually no decarbonylation being detected. This offers the potential to feed the product stream into a conventional methane steam reformer for the production of hydrogen with higher selectivity. DRIFTS and the temperature-programmed reaction of ethanol steam reforming, as well as fixed bed catalyst testing, revealed that the addition of just 2.9% Cs was able to stave off decarbonylation almost completely by attenuating the metallic function. This occurs with a decrease in ethanol conversion of just 16% relative to the undoped catalyst. In comparison with our previous work with Na, this amount is—on an equivalent atomic basis—just 28% of the amount of Na that is required to achieve the same effect. Thus, Cs is a much more efficient promoter than Na in facilitating decarboxylation.

【 授权许可】

Unknown