Hydrogen production via steam reforming of methanol on Cu/ZnO/Al2O3 catalysts: Effects of Al2O3 precursors

Q3 Energy 燃料化学学报 Pub Date : 2024-10-01 DOI:10.1016/S1872-5813(24)60459-7
HUANG Min , BO Qifei , LI Juan , QIAO Jingxuan , YUAN Shanliang , ZHANG Biao , CHEN Honglin , JIANG Yi
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Abstract

A series of Cu/ZnO/Al2O3 catalysts were prepared by co-precipitation method. This research focuses on investigating the influence of different Al2O3 precursors on the catalyst structure through thorough structural characterization techniques. Additionally, the catalytic performance of these catalysts in methanol reforming for hydrogen production was systematically evaluated. The results indicate that the simultaneous co-precipitation of Al3+ with Cu2+ and Zn2+ leads to partial substitution of Cu-Zn in the basic carbonates by Al3+. This substitution forms a hydrotalcite-like structure and strengthens Zn-Al interactions. On the contrary, after the co-precipitation of Cu2+ and Zn2+, introducing the Al2O3 precursor has a positive effect on eliminating the adverse effects of Al3+ on Cu-Zn substitution in basic carbonates. This process promotes the Cu-ZnO interaction, facilitates the dispersion of CuO species, and enhances the reducibility of catalysts. It also improves the dispersion of Cu on the surface, and ultimately enhanced the catalytic activity. Notably, the catalyst prepared using pseudo-boehmite as the Al2O3 precursor exhibited the highest activity. Under the conditions of a H2O/CH3OH molar ratio of 1.2 and a reaction temperature of 493 K, methanol conversion reached 94.8%, and the H2 space-time yield was 97.5 mol/(kg·h). The catalyst activity remained relatively stable after continuous operation for 25 h. Even after being heat-treated at 723 K for 10 h, the activity loss of the catalyst was only 5.37%.
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在 Cu/ZnO/Al2O3 催化剂上通过甲醇蒸汽转化制氢:Al2O3 前驱体的影响
通过共沉淀法制备了一系列 Cu/ZnO/Al2O3 催化剂。本研究的重点是通过全面的结构表征技术研究不同 Al2O3 前驱体对催化剂结构的影响。此外,还系统评估了这些催化剂在甲醇重整制氢过程中的催化性能。结果表明,Al3+ 与 Cu2+ 和 Zn2+ 同时共沉淀会导致碱式碳酸盐中的 Cu-Zn 被 Al3+ 部分取代。这种置换形成了类似水滑石的结构,并加强了 Zn-Al 的相互作用。相反,在 Cu2+ 和 Zn2+ 共沉淀后,引入 Al2O3 前驱体对消除 Al3+ 对碱性碳酸盐中 Cu-Zn 取代的不利影响有积极作用。这一过程促进了 Cu-ZnO 的相互作用,有利于 CuO 物种的分散,并提高了催化剂的还原性。它还改善了 Cu 在表面的分散,最终提高了催化活性。值得注意的是,用假沸石作为 Al2O3 前驱体制备的催化剂活性最高。在 H2O/CH3OH 摩尔比为 1.2 和反应温度为 493 K 的条件下,甲醇转化率达到 94.8%,H2 时空产率为 97.5 mol/(kg-h)。即使在 723 K 温度下加热 10 小时,催化剂的活性损失也仅为 5.37%。
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来源期刊
燃料化学学报
燃料化学学报 Chemical Engineering-Chemical Engineering (all)
CiteScore
2.80
自引率
0.00%
发文量
5825
期刊介绍: Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.
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