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论文类型：期刊论文

发表时间：2016-11-16

发表刊物：CHEMISTRYSELECT

收录刊物：SCIE

卷号：1

期号：19

页面范围：6160-6166

ISSN号：2365-6549

关键字：heterogeneous catalysis; hollow; nanoparticles; oxidation; post-synthesis; titanium silicalite-1; zeolites

摘要：A titanium silicalite-1 (TS-1) extrudate with high content of titanium on the external surface was post-synthesized by using the mixed solution of tetrapropylammonium hydroxide and the hydrolysate of tetrabutyl titanate. The influence of Ti concentration in the post-synthesis solution on the physicochemical properties and catalytic performance of TS-1 was also studied. The amorphous silica support covering on the external surface of TS-1 was crystallized, and some hollows appeared in the samples that were post-synthesized. Most titanium introduced by this method are located at the external surface of the new generated TS-1 particles. The molar ratio of Si/Ti on the external surface decreases with the increase of the Ti concentration in the post-synthesis solution. The catalytic activity for phenol hydroxylation over the TS-1 samples is enhanced after the post-synthesis due to the new generated framework Ti on the external surface, providing the reactants more easily adsorbable active centers. A proper Ti concentration (10 vol%) in the post-synthesis solution leads to the highest catalytic activity by obtaining a proper ratio of tetrahedral and octahedral Ti to anatase TiO2.