Simple CTAB surfactant-assisted hierarchical lamellar MWW   titanosilicate: a high-performance catalyst for selective oxidations   involving bulky substrates

doi:10.1039/c7cy00756f

CORC > 北京大学 > 化学与分子工程学院

	Simple CTAB surfactant-assisted hierarchical lamellar MWW titanosilicate: a high-performance catalyst for selective oxidations involving bulky substrates
	Ji, Xinyi ; Xu, Le ; Du, Xin ; Lu, Xinqing ; Lu, Wanpeng ; Sun, Junliang ; Wu, Peng
刊名	CATALYSIS SCIENCE & TECHNOLOGY
	2017
关键词	MOLECULAR-SIEVE STRUCTURAL-CHARACTERIZATION CYCLOHEXANONE AMMOXIMATION POROUS MATERIALS TI-MWW ZEOLITE EPOXIDATION TITANIUM SITES MFI
DOI	10.1039/c7cy00756f
英文摘要	A novel multilamellar titanosilicate composed of MWW-type nanosheets, Ti-ECNU-7P layered precursor, was directly synthesized for the first time with the assistance of boron atoms as the crystallization-supporting agent and a simple surfactant cetyltrimethylammonium bromide (CTAB) as the interlayer swelling and pillaring agent. The new Ti-ECNU-7P materials were hydrothermally synthesized readily in a wide Si/Ti molar ratio range of 10-200, when the Si/B molar ratio was 10. Ti-ECNU-7P possessed a multilamellar mesostructure, which was constructed via alternate stacking of 2.5 nm MWW zeolite nanosheets and ca. 2.4 nm CTAB molecules. This lamellar titanosilicate possessed large interlayer spacing hardly achieved by conventional hydrothermal synthesis. Subsequent acid treatment and calcination on the multilamellar precursor effectively removed the extraframework Ti species, the organic species intercalated and the majority of framework boron atoms, leading to a hierarchical titanosilicate Ti-ECNU-7 catalyst with relatively high external surface area and high concentration of Ti species on the crystal surface. The catalytic performance of hierarchical Ti-ECNU-7 nanosheets was comprehensively investigated and compared with that of typical titanosilicates in the epoxidation of various bulky alkenes with different oxidants, including aqueous H2O2, tert-butyl hydroperoxide and cumene hydroperoxide. Owing to the hierarchical architecture and more accessible active sites on the external surface, the hierarchical Ti-ECNU-7 catalyst proved to be more active than conventional titanosilicates for selective oxidations involving either bulky substrates or oxidants. Additionally, it was robust against Ti leaching and irreversible deactivation.; National Natural Science Foundation of China [21533002, 21373089]; China Ministry of Science and Technology [2016YFA0202804]; Ph.D Programs Foundation of Ministry of Education [2012007613000]; China Postdoctoral Science Foundation [2015M580012]; SCI(E); ARTICLE; 13; 2874-2885; 7
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/472223]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Ji, Xinyi,Xu, Le,Du, Xin,et al. Simple CTAB surfactant-assisted hierarchical lamellar MWW titanosilicate: a high-performance catalyst for selective oxidations involving bulky substrates[J]. CATALYSIS SCIENCE & TECHNOLOGY,2017.
APA	Ji, Xinyi.,Xu, Le.,Du, Xin.,Lu, Xinqing.,Lu, Wanpeng.,...&Wu, Peng.(2017).Simple CTAB surfactant-assisted hierarchical lamellar MWW titanosilicate: a high-performance catalyst for selective oxidations involving bulky substrates.CATALYSIS SCIENCE & TECHNOLOGY.
MLA	Ji, Xinyi,et al."Simple CTAB surfactant-assisted hierarchical lamellar MWW titanosilicate: a high-performance catalyst for selective oxidations involving bulky substrates".CATALYSIS SCIENCE & TECHNOLOGY (2017).