Hydrogenation of CO2 to methanol over Cu/ZnCr catalyst
| Autor: | Hong Xie, Bing Liu, Lian Yun, Shuhao Xiong |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
020209 energy
General Chemical Engineering Organic Chemistry Energy Engineering and Power Technology 02 engineering and technology Water-gas shift reaction Methane Catalysis Metal chemistry.chemical_compound Fuel Technology 020401 chemical engineering chemistry visual_art 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium Methanol 0204 chemical engineering Selectivity Nuclear chemistry |
| Zdroj: | Fuel. 256:115975 |
| ISSN: | 0016-2361 |
| DOI: | 10.1016/j.fuel.2019.115975 |
| Popis: | In this study, Cu/ZnCr catalysts were prepared by the impregnation method, and were characterize by BET, XRD, H2-TPR technologies. The as-prepared Cu/ZnCr catalysts were studied for the CO2 hydrogenation in a fixed-bed reactor. Both the metal sites and the support showed a great influence on the efficiency of the CO2 hydrogenation. It was found that the ratio of Zn/Cr had a great effect on the methanol selectivity, while it did not influence the catalyst activity in terms of CO2 conversion. XRD results confirmed the existence of some dissociative ZnO in the 10Cu/ZnCr-3.5 catalyst. The complex of ZnO and ZnCr2O4 in the 10Cu/ZnCr-3.5 catalyst inhibited the reverse water gas shift reaction, and promoted the formation of methanol. Interestingly, the content of Co was also found to have a great influence on the product selectivity. The formation of CO could be inhibited drastically by the addition of Co to the 10Cu/ZnCr-3.5 catalyst, but Co accelerated the hydrogenation of CO2 to methane. 10Cu/ZnCr-3.5 was still the best catalyst for the hydrogenation of CO2 into methanol. At 300 °C and 2 MPa, the STY of methanol reached 4.7 mmol/gcat/h (XCO2 = 25.1%, SMeOH = 31.1%) over the 10Cu/ZnCr-3.5 catalyst. |
| Databáze: | OpenAIRE |
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