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Reversing Titanium Oligomer Formation towards High‐Efficiency and Green Synthesis of Titanium‐Containing Molecular Sieves
Author(s) -
Lin Dong,
Zhang Quande,
Qin Zhengxing,
Li Qing,
Feng Xiang,
Song Zhaoning,
Cai Zhenping,
Liu Yibin,
Chen Xiaobo,
Chen De,
Mintova Svetlana,
Yang Chaohe
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202011821
Subject(s) - molecular sieve , titanium , anatase , propene , catalysis , monomer , chemistry , hydrothermal synthesis , oligomer , environmentally friendly , hydrolysis , hydrothermal circulation , materials science , chemical engineering , organic chemistry , photocatalysis , polymer , ecology , biology , engineering
Green and efficient synthesis of titanium‐containing molecular sieves is limited by the quantity of environmentally unfriendly additives and complicated synthesis procedures required. Oligomerization of Ti monomers into anatase TiO 2 is the typical outcome of such procedures because of a mismatch between hydrolysis rates of Si and Ti precursors. We report a simple and generic additive‐free route for the synthesis of Ti‐containing molecular sieves (MFI, MEL, and BEA). This approach successfully reverses the formation of Ti oligomers to match hydrolysis rates of Ti and Si species with the assistance of hydroxyl free radicals generated in situ from ultraviolet irradiation. Moreover, fantastic catalytic performance for propene epoxidation with H 2 and O 2 was observed. Compared with the conventional hydrothermal method, this approach opens up new opportunities for high‐efficiency, environmentally benign, and facile production of pure titanium‐containing molecular sieves.