Oxidation of styrene to benzaldehyde and styrene oxide over nickel and copper ceria solution combustion catalysts

MATEC Web of Conferences Pub Date : 2023-01-01 DOI:10.1051/matecconf/202337401004

Qinisani Gazu, Mzamo L. Shozi, P. Mpungose

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Abstract

CeO2, Cu0.05Ce0.95O2-δ, Ni0.04Ce0.96O2-δ, Cu0.05Ni0.05Ce0.90O2-δ, catalysts were synthesised via solution combustion technique using urea as a fuel. The as pre-preared catalysts were characterised via X-ray powder diffraction, Brunauer-Emmett-Teller surface area analysis, transmission and scanning electron microscopy analysis. The characterisation techniques strongly suggested that all the catalysts were prepared successfully, and that copper and nickel were successfully incorporated into the lattice structure of ceria. The effect of the reaction conditions on the catalytic properties of the synthesised material were studied in detail using Cu0.05Ni0.05Ce0.90O2-δ as the model catalyst. The effect of temperature, solvents and co-oxidants was investigated in optimisation studies. A combination of acetonitrile, tert-butyl hydroperoxide and a temperature of 60 °C were found to be optimal after 24 hours and used for all catalysts. All catalysts were found to be active in styrene oxidation under these conditions, with styrene conversion as high as 69% over Ni0.04Ce0.96O2-δ, and selectivity to benzaldehyde and styrene oxide 38 and 26% respectively.

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苯乙烯在镍和铜铈溶液燃烧催化剂上氧化为苯甲醛和苯乙烯氧化物

以尿素为燃料，采用溶液燃烧技术合成了CeO2、Cu0.05Ce0.95O2-δ、Ni0.04Ce0.96O2-δ、Cu0.05Ni0.05Ce0.90O2-δ等催化剂。通过x射线粉末衍射、布鲁诺尔-埃米特-泰勒表面积分析、透射电镜和扫描电镜对制备的催化剂进行了表征。表征技术有力地表明，所有的催化剂都是成功制备的，并且铜和镍成功地结合到二氧化铈的晶格结构中。以Cu0.05Ni0.05Ce0.90O2-δ为模型催化剂，详细研究了反应条件对合成材料催化性能的影响。在优化研究中考察了温度、溶剂和共氧化剂的影响。24小时后发现，乙腈、过氧化叔丁基和60℃的温度组合是最佳的，所有催化剂都使用。在此条件下，所有催化剂对苯乙烯的氧化都很有活性，在Ni0.04Ce0.96O2-δ上苯乙烯的转化率高达69%，对苯甲醛和苯乙烯的选择性分别为38%和26%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

MATEC Web of Conferences

自引率

0.00%

发文量

342

审稿时长

6 weeks

期刊介绍： MATEC Web of Conferences is an Open Access publication series dedicated to archiving conference proceedings dealing with all fundamental and applied research aspects related to Materials science, Engineering and Chemistry. All engineering disciplines are covered by the aims and scope of the journal: civil, naval, mechanical, chemical, and electrical engineering as well as nanotechnology and metrology. The journal concerns also all materials in regard to their physical-chemical characterization, implementation, resistance in their environment… Other subdisciples of chemistry, such as analytical chemistry, petrochemistry, organic chemistry…, and even pharmacology, are also welcome. MATEC Web of Conferences offers a wide range of services from the organization of the submission of conference proceedings to the worldwide dissemination of the conference papers. It provides an efficient archiving solution, ensuring maximum exposure and wide indexing of scientific conference proceedings. Proceedings are published under the scientific responsibility of the conference editors.