Comparative Study on the Effect of Cerina and Alumina on the Catalytic Activity of CuO-ZnO Based Catalyst in CO2 Hydrogenation to Methanol

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2024-07-13 DOI:10.1007/s10562-024-04756-1

Allam Djaouida, Hocine Smain, Thomas Sébastien, Parkhomenko Ksenia, Roger Anne-Cécile, Kaci Samira

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Abstract

Ternary Cu/ZnO/Al₂O₃ and Cu/ZnO/CeO₂ catalysts were prepared by polyol method and tested for gas-phase low-temperature methanol synthesis from hydrogenation of CO₂. The catalysts were characterized by N₂ physisorption, SEM–EDX, XRD, H₂-TPR and XPS. The activity of the catalysts was evaluated in a fixed-bed micro-reactor at atmospheric pressure and 40 bar at different reaction temperatures, and H₂/CO₂ ratio of 3:1. The results showed that the nature of the promoter influenced the physicochemical properties of the catalysts as well as the catalytic activity and product selectivity. Compared with ternary Cu/ZnO/Al₂O₃ catalyst, Cu/ZnO/CeO₂ catalyst indicated that modifcation of CuO/ZnO catalyst with CeO₂ promoted the CuO dispersion, reduced the CuO crystallite size, decreased the reduction temperature of highly dispersed CuO, decreased the activation energy and improved the catalytic activity of the Cu/ZnO/CeO₂ catalyst.

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铈和氧化铝对基于 CuO-ZnO 的催化剂在 CO2 加氢制甲醇中催化活性影响的比较研究

采用多元醇法制备了 Cu/ZnO/Al2O3 和 Cu/ZnO/CeO2 三元催化剂，并进行了二氧化碳加氢气相低温合成甲醇的测试。催化剂的表征包括 N2 物理吸附、SEM-EDX、XRD、H2-TPR 和 XPS。在固定床微反应器中，在常压和 40 巴、不同反应温度以及 H2/CO2 比为 3:1 的条件下，对催化剂的活性进行了评估。结果表明，促进剂的性质影响了催化剂的理化性质以及催化活性和产品选择性。与 Cu/ZnO/Al2O3 三元催化剂相比，Cu/ZnO/CeO2 催化剂表明，用 CeO2 对 CuO/ZnO 催化剂进行改性可促进 CuO 的分散，减小 CuO 结晶尺寸，降低高度分散 CuO 的还原温度，降低活化能，提高 Cu/ZnO/CeO2 催化剂的催化活性。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.