真实空气作氧化剂在金基催化剂上催化氧化乳酸乙酯制丙酮酸乙酯

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL Catalysis Surveys from Asia Pub Date : 2022-05-21 DOI:10.1007/s10563-022-09359-7
Shiyao Lu, Jian Zhang, Zhiyi Wu, Zerui Su, Jianbin Huang, Yehao Liang, Feng-Shou Xiao
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引用次数: 0

摘要

采用简便方法制备了负载在Ni-Al混合金属氧化物(Au/NiAl-MMO)上的高度分散的Au纳米颗粒,该纳米颗粒在真实空气为氧化剂的条件下对乳酸乙酯的好氧氧化效果显著,在240℃的连续固定床反应器中乳酸乙酯转化率为72.6%,丙酮酸乙酯选择性为88.3%。该催化剂在长期稳定性试验中保持了其催化性能。对反应物和基本反应步骤的动力学依赖顺序进行表征和实验研究,证实Au/NiAl-MMO催化剂遵循Mars-van Krevelen机理,以O2活化为基本反应步骤。准原位x射线光电子能谱分析表明,Au/NiAl-MMO催化剂的活性位点为Au纳米粒子。本研究为开发以真实空气为氧化剂的负载型金属催化剂制备乳酸乙酯的好氧反应提供了一种新技术。摘要制备了分散的金纳米颗粒催化剂,用于乳酸乙酯在真实空气中的高效催化氧化。
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Catalytic Oxidation of Ethyl Lactate to Ethyl Pyruvate over Au-Based Catalyst Using Authentic Air as Oxidant

Highly dispersed Au nanoparticles supported on Ni–Al mixed metal oxides (Au/NiAl-MMO) were prepared by a facile method, which is significantly efficient for the aerobic oxidation of ethyl lactate using authentic air as the oxidant, achieving 72.6% ethyl lactate conversion and 88.3% selectivity to ethyl pyruvate at 240 °C in a continuous fixed-bed reactor. The catalyst retained its catalytic performance during a long-term stability test. Characterization and experimental studies on the kinetic dependence sequence of the reactants and elementary reaction steps confirmed that the Au/NiAl-MMO catalyst followed the Mars–van Krevelen mechanism, with the activation of O2 as the elementary step. The quasi in situ X-ray photoelectron spectroscopy spectra demonstrated that the active sites in the Au/NiAl-MMO catalyst were Au nanoparticles. This work may provide a novel technique for developing more efficient supported metal catalysts for the aerobic oxidation of ethyl lactate using authentic air as the oxidant.

Graphical abstract

Highly dispersed Au nanoparticle catalyst was facilely prepared for the efficient catalytic oxidation of ethyl lactate with authentic air.

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来源期刊
Catalysis Surveys from Asia
Catalysis Surveys from Asia 化学-物理化学
CiteScore
4.80
自引率
0.00%
发文量
29
审稿时长
>12 weeks
期刊介绍: Early dissemination of important findings from Asia which may lead to new concepts in catalyst design is the main aim of this journal. Rapid, invited, short reviews and perspectives from academia and industry will constitute the major part of Catalysis Surveys from Asia . Surveys of recent progress and activities in catalytic science and technology and related areas in Asia will be covered regularly as well. We would appreciate critical comments from colleagues throughout the world about articles in Catalysis Surveys from Asia . If requested and thought appropriate, the comments will be included in the journal. We will be very happy if this journal stimulates global communication between scientists and engineers in the world of catalysis.
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