Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO<sub>2</sub> Catalysts at Low Temperature
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-ZrO<sub>2</sub> catalysts increases the basicity and promotes the decarboxylation route, convertin...
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MDPI AG
2021-09-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/11/9/1104 |
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| author | Zahra Rajabi Li Jones Michela Martinelli Dali Qian Donald C. Cronauer A. Jeremy Kropf Caleb D. Watson Gary Jacobs |
| author_facet | Zahra Rajabi Li Jones Michela Martinelli Dali Qian Donald C. Cronauer A. Jeremy Kropf Caleb D. Watson Gary Jacobs |
| author_sort | Zahra Rajabi |
| collection | DOAJ |
| description | 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-ZrO<sub>2</sub> catalysts increases the basicity and promotes the decarboxylation route, converting ethanol to mainly H<sub>2</sub>, CO<sub>2</sub>, and CH<sub>4</sub> 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. |
| first_indexed | 2024-03-10T07:49:45Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T07:49:45Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-d370712b0c1d42bba45c52ee5e7822d62023-11-22T12:21:27ZengMDPI AGCatalysts2073-43442021-09-01119110410.3390/catal11091104Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO<sub>2</sub> Catalysts at Low TemperatureZahra Rajabi0Li Jones1Michela Martinelli2Dali Qian3Donald C. Cronauer4A. Jeremy Kropf5Caleb D. Watson6Gary Jacobs7Department of Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USADepartment of Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USAUniversity of Kentucky Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, USAUniversity of Kentucky Electron Microscopy Center, University of Kentucky, ASTeCC Building—Room A004, Lexington, KY 40508, USAArgonne National Laboratory, Lemont, IL 60439, USAArgonne National Laboratory, Lemont, IL 60439, USADepartment of Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USADepartment of Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USAThe 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-ZrO<sub>2</sub> catalysts increases the basicity and promotes the decarboxylation route, converting ethanol to mainly H<sub>2</sub>, CO<sub>2</sub>, and CH<sub>4</sub> 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.https://www.mdpi.com/2073-4344/11/9/1104ethanol steam reforming (ESR)DRIFTSCs dopingzirconiadecarboxylationdecarbonylation |
| spellingShingle | Zahra Rajabi Li Jones Michela Martinelli Dali Qian Donald C. Cronauer A. Jeremy Kropf Caleb D. Watson Gary Jacobs Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO<sub>2</sub> Catalysts at Low Temperature Catalysts ethanol steam reforming (ESR) DRIFTS Cs doping zirconia decarboxylation decarbonylation |
| title | Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO<sub>2</sub> Catalysts at Low Temperature |
| title_full | Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO<sub>2</sub> Catalysts at Low Temperature |
| title_fullStr | Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO<sub>2</sub> Catalysts at Low Temperature |
| title_full_unstemmed | Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO<sub>2</sub> Catalysts at Low Temperature |
| title_short | Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO<sub>2</sub> Catalysts at Low Temperature |
| title_sort | influence of cs promoter on ethanol steam reforming selectivity of pt m zro sub 2 sub catalysts at low temperature |
| topic | ethanol steam reforming (ESR) DRIFTS Cs doping zirconia decarboxylation decarbonylation |
| url | https://www.mdpi.com/2073-4344/11/9/1104 |
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