Zinc oxide-modified mordenite as an effective catalyst for the dehydrogenation of (bio)ethanol to acetaldehyde†
Zinc oxide-modified mordenite as an effective catalyst for the dehydrogenation of (bio)ethanol to acetaldehyde†
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DOI：
10.1039/d1se00091h
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发表时间：
2021-03-15
影响因子：
5.6
通讯作者：
Taylor, Russell A.
中科院分区：
文献类型：
--
作者：
Raynes, Samuel J.;Taylor, Russell A.
乙醇直接转化为乙醛是生物乙醇级联转化为更高价值化学品和开发可持续燃料的重要一步。在此，通过简单的湿法浸渍法制备的碱性阳离子交换丝光沸石负载氧化锌（ZnO/M-MOR）被证明是一种选择性且稳定的催化剂，用于在400℃连续流动条件下乙醇直接脱氢为乙醛。通过改变 ZnO 负载量和沸石抗衡阳离子（Na、K、Rb、Cs），确定了最佳催化剂材料，ZnO/Rb-MOR 负载量为 3.5 wt% Zn。通过简单改变骨架外碱金属阳离子，乙醛生产率（标准化为 Zn）可提高 80% 以上，乙烯选择性可降低至 0.9%。非常低的乙烯产量导致碳质沉积物含量低，因此在短时间内运行时的失活程度最小（
The direct transformation of ethanol to acetaldehyde is an important step in the cascade conversion of bioethanol to higher value chemicals and for the development of sustainable fuels. Herein, zinc oxide supported on alkali cation-exchanged mordenite (ZnO/M-MOR) prepared by a simple wetness impregnation method, is shown to be a selective and stable catalyst for the direct dehydrogenation of ethanol to acetaldehyde at 400 degrees C under continuous flow conditions. Through variation of the ZnO loading and the zeolite counter-cation (Na, K, Rb, Cs), an optimum catalyst material was identified, ZnO/Rb-MOR loaded at 3.5 wt% Zn. Acetaldehyde productivity (normalised to Zn) could be increased by over 80% and ethylene selectivity reduced to 0.9% through simple variation of the extra-framework alkali cation. Very low ethylene production leads to low levels of carbonaceous deposits and therefore minimal deactivation at short time on stream (