钛
催化作用
锐钛矿
钛酸酯
材料科学
化学工程
氢氧化物
二氧化钛
氧化钛
无定形固体
金红石
无机化学
煅烧
四氯化钛
比表面积
介孔材料
光催化
钛铁矿
化学
结晶学
有机化学
冶金
陶瓷
工程类
作者
Yi Zuo,Min Liu,Mengtong Ma,Yanli Wang,Xinwen Guo,Chunshan Song
标识
DOI:10.1002/slct.201601430
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.
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