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首页> 外文期刊>Catalysis science & technology >Synergistic effect between Cu-Cr bimetallic oxides supported on g-C3N4 for the selective oxidation of toluene to benzaldehyde
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Synergistic effect between Cu-Cr bimetallic oxides supported on g-C3N4 for the selective oxidation of toluene to benzaldehyde

机译：之间的协同效应Cu-Cr双金属氧化物支持g-C3N4选择性氧化甲苯,苯甲醛

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摘要

A well-defined catalyst with Cu-Cr bimetallic oxides supported on g-C3N4 was prepared via direct heating treatment of metallic precursors incipiently decorated with melamine. The obtained catalysts were used in the selective oxidation of toluene to benzaldehyde with H2O2 as the oxidant, the prepared bimetallic Cu-Cr catalysts outperformed their monometallic counterparts, and the highest benzaldehyde yield can reach 42.9% within 5 h under mild reaction conditions. It was found that some metal oxides were coated with g-C3N4 to form a core/shell-like structure, which hindered the metal leaching. XPS analysis indicated the presence of some low valence Cu species and the electronic interactions between the Cu and Cr species. The bimetallic Cu-Cr catalysts had a larger specific surface area and pore volume compared to the monometallic ones. Besides, the effects of the reaction parameters on catalytic activity were investigated in detail. The kinetics study indicated that toluene oxidation was a first order reaction and the apparent activation energy was calculated to be 24.3 kJ mol(-1). The recycling tests verified the good reusability of the prepared catalyst, making it promising in the future practical catalysis application. Finally, a possible reaction mechanism for the selective oxidation of toluene over the supported catalyst was proposed.
机译：一个定义良好的催化剂与Cu-Cr双金属氧化物支持g-C3N4是通过准备的直接加热治疗金属前体早期地装饰着三聚氰胺。用于选择性氧化催化剂甲苯,苯甲醛与过氧化氢作为氧化剂,准备的双金属Cu-Cr催化剂优于单本位制的同行苯甲醛最高收益率可以达到42.9%在温和的反应条件下在5 h。发现一些金属氧化物涂层g-C3N4形成核心/似壳的结构阻碍了金属浸出。表示一些低价铜的存在物种和电子之间的相互作用铜和铬物种。有一个更大的比表面积和催化剂孔隙体积相比单本位制的国家。此外,反应参数的影响研究了催化活性细节。氧化反应是一级反应,表观活化能计算24.3 kJ摩尔(1)。法制备的催化剂的可重用性好,制作它承诺在未来实际催化应用程序。甲苯的选择性氧化的机制在催化剂提出了支持。

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