Amorphous titania was added to the gel for titanium silicalite synthesis using TPABr as templating agent. In the hydrothermal condition, a nanostructured titanium silicalite grew on the amorphous titania owing to the ...Amorphous titania was added to the gel for titanium silicalite synthesis using TPABr as templating agent. In the hydrothermal condition, a nanostructured titanium silicalite grew on the amorphous titania owing to the restriction effect of titania. The resulting material had low XRD crystallinity (below 40%) but high IR crystallinity ( I 550 / I 450 >0 7). High resolution TEM showed that the material contained particles with dimension less than 50 nm. A typical catalyst with n (Si)/ n (Ti)=2 contained secondary porous structure with diameter of about 8 nm, which was disclosed by N 2 desorption data. The catalytic activity of TS/TiO 2 catalyst was even higher than TS 1 catalyst in epoxidation of 3 chloropropylene with aqueous hydrogen peroxide. A new cheap method to prepare the highly active catalyst for selective oxidation was provided.展开更多
钛硅分子筛(TS-1)并不是一种新型催化剂,其开发并成功应用于催化丙烯转化为环氧丙烷已近40年。现在,通过结合各种研究方法,来自苏黎世联邦理工学院、科隆大学、弗里茨·哈伯研究所(Fritz Haber Institute)和巴斯夫的科学家团队共同...钛硅分子筛(TS-1)并不是一种新型催化剂,其开发并成功应用于催化丙烯转化为环氧丙烷已近40年。现在,通过结合各种研究方法,来自苏黎世联邦理工学院、科隆大学、弗里茨·哈伯研究所(Fritz Haber Institute)和巴斯夫的科学家团队共同揭示了这种催化剂出乎意料的作用机制。这些研究结果将有助于推动催化剂研究向前迈出重要的一步。展开更多
文摘Amorphous titania was added to the gel for titanium silicalite synthesis using TPABr as templating agent. In the hydrothermal condition, a nanostructured titanium silicalite grew on the amorphous titania owing to the restriction effect of titania. The resulting material had low XRD crystallinity (below 40%) but high IR crystallinity ( I 550 / I 450 >0 7). High resolution TEM showed that the material contained particles with dimension less than 50 nm. A typical catalyst with n (Si)/ n (Ti)=2 contained secondary porous structure with diameter of about 8 nm, which was disclosed by N 2 desorption data. The catalytic activity of TS/TiO 2 catalyst was even higher than TS 1 catalyst in epoxidation of 3 chloropropylene with aqueous hydrogen peroxide. A new cheap method to prepare the highly active catalyst for selective oxidation was provided.
文摘钛硅分子筛(TS-1)并不是一种新型催化剂,其开发并成功应用于催化丙烯转化为环氧丙烷已近40年。现在,通过结合各种研究方法,来自苏黎世联邦理工学院、科隆大学、弗里茨·哈伯研究所(Fritz Haber Institute)和巴斯夫的科学家团队共同揭示了这种催化剂出乎意料的作用机制。这些研究结果将有助于推动催化剂研究向前迈出重要的一步。
