关键词: 催化剂, 核壳结构, 模板法, 氧化, 苯甲醇

Abstract:

Exploring effective nano-Au loading mechanism can improve the loading capacity, stability and distribution anchoring effect of Au nanoparticles (NPs), so as to construct the high-performance catalytic reaction system. The amino functionalized polymer template method was adopted to fabricate the Au@H-mCeO₂ hollow core-shell composite catalyst with the mCeO₂ mesoporous shell and encapsulated nanosized Au active sites. Due to the excellent oxygen overflow property of mCeO₂ and the enhanced synergistic effect between Au and mCeO₂, the catalyst showed significantly better catalytic performance than mTiO₂ and mSiO₂ shell deposited catalysts in the solvent-free selective catalytic oxidation of benzyl alcohol into benzaldehyde. Under the optimal reaction conditions, the conversion of benzyl alcohol catalyzed by Au@H-mCeO₂ catalyst reached 60% and the selectivity of benzaldehyde was 88%. The recombination process of in-situ supported Au NPs assisted by amino functionalized polymer template and mesoporous oxide encapsulation of mCeO₂ can better disperse and stabilize the catalytic active sites of Au NPs. Thus, in the cyclic reaction and thermal filtration experiments, the aggregation and loss of Au NPs can be effectively inhibited, so that the excellent catalytic reaction activity and stability of the catalyst can be maintained.

Key words: catalyst, core-shell structure, template method, oxidation, benzyl alcohol