Lei Zhang, Zhihao Shu, Ji’E Tang, Xinmiao Wang, Bin Xie, Tiandi Tang
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引用次数: 0
摘要
开发高效的烯烃环氧化催化剂是烯烃环氧化工业应用的关键。本文通过水热法合成了具有不同表面性质（BMO-x, x = A， B， C）的钼酸铋样品，并在环己烯环氧化反应中进行了测试。BMO-A催化剂表现出优异的催化活性，环己烯转化率为67.3%，环氧化物选择性为83.6%，优于BMO-B（转化率17.4%，选择性40.2%）和BMO-C（转化率27.0%，选择性59.1%）催化剂。这种增强的活性归因于BMO-A具有较高的表面交换氧百分比、较高的表面Mo/Bi比和最佳的表面润湿性。BMO-A催化剂具有较高的表面交换氧率、较高的表面Mo/Bi比和适宜的表面润湿性，具有较高的环氧化性能。具体来说，BMO-A具有更多的交换氧，有利于H2O2分子的吸附，随后与环己烯反应生成环氧环己烷。BMO-A的亲水表面进一步增强了反应界面处H2O2的富集。本研究为烯烃环氧化反应制备高活性催化剂提供了新的思路。图形抽象
Investigation of Catalytic Performance of γ-Bi2MoO6 Material on the Epoxidation of the Cyclohexene
The development of efficient catalyst for the epoxidation of alkenes is crucial in industrial application. Herein, bismuth molybdate samples with different surface properties (BMO-x, x = A, B, and C) were synthesized via a hydrothermal method and tested in cyclohexene epoxidation. The BMO-A catalyst exhibited superior catalytic activity, achieving a 67.3% cyclohexene conversion with 83.6% epoxide selectivity, outperforming the BMO-B (17.4% conversion, 40.2% selectivity) and BMO-C (27.0% conversion, 59.1% selectivity) catalysts. This enhanced activity is attributed to BMO-A’s higher percentage of surface exchangeable oxygen, high surface Mo/Bi ratio, and optimal surface wettability. The high epoxidation performance of the BMO-A catalyst was attributed to its larger percentage of surface exchangeable oxygen, high surface Mo/Bi ratio, and suitable surface wettability. Specifically, the BMO-A with more exchangeable oxygen facilitated the adsorption of H2O2 molecules, and subsequent reaction with cyclohexene to yield epoxy-cyclohexane. The hydrophilic surface of BMO-A further enhanced H2O2 enrichment at the reaction interface. This work provides a new strategy for preparing highly active catalyst for the epoxidation of alkenes.
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.
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