Study on the effects of Rh loading on the selectivity to methanol and ethanol in CO<sub>2</sub> hydrogenation reaction over Rh/CeO<sub>2</sub> catalyst

ZHENG Ke; LIU Bing; XU Yuebing; LIU Xiaohao

doi:10.1016/S1872-5813(24)60450-0

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ZHENG Ke, LIU Bing, XU Yuebing, LIU Xiaohao. Study on the effects of Rh loading on the selectivity to methanol and ethanol in CO2 hydrogenation reaction over Rh/CeO2 catalyst[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(24)60450-0

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ZHENG Ke, LIU Bing, XU Yuebing, LIU Xiaohao. Study on the effects of Rh loading on the selectivity to methanol and ethanol in CO₂ hydrogenation reaction over Rh/CeO₂ catalyst[J]. Journal of Fuel Chemistry and Technology. doi: 10.1016/S1872-5813(24)60450-0

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Study on the effects of Rh loading on the selectivity to methanol and ethanol in CO₂ hydrogenation reaction over Rh/CeO₂ catalyst

doi: 10.1016/S1872-5813(24)60450-0

School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China

Funds: The project was supported by the National Key Research and Development program of China (2023YFB4103201) and the National Natural Science Foundation of China (22379053).

Received Date: 2024-03-01
Accepted Date: 2024-03-25
Rev Recd Date: 2024-03-22

Available Online: 2024-04-29

Abstract

Abstract

The capture and hydrogenation of carbon dioxide (CO₂) into high-value chemicals such as alcohols is one of the important ways to reduce CO₂ emissions and achieve the circular economy. This study investigated the catalytic performance of Rh/CeO₂ catalysts with different Rh loadings in the range of 0.1%−2.0% in the CO₂ hydrogenation reaction. Various characterizations including XRD, Raman, H₂-TPR, CO₂-TPD, CO-DRIFTS, and XPS were employed to reveal the influence of Rh loading on the catalytic activity and product selectivity. The results showed that ethanol was the major product for CO₂ hydrogenation reaction at 250 ℃ and 3.0 MPa over 0.1% Rh/CeO₂ catalyst. With the increase of Rh loading, CO₂ conversion increased along with the decline in ethanol selectivity. When Rh loading reached 2.0%, the main product shifted to methanol. The difference in product selectivity over Rh/CeO₂ catalysts with changed Rh loadings is related to the different structure and electronic properties of Rh. Atomically dispersed Rh⁺ species favor the stabilization of CO* and its subsequent C−C coupling with CH₃* to form ethanol, while metallic Rh clusters facilitate the hydrogenation of CO* to form methanol.
- CO₂ hydrogenation,
- methanol,
- ethanol,
- oxygen vacancies,
- single atom,
- cluster

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References(37)

References

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