Premium
Regeneration of Deactivated Hollow Titanium Silicalite Zeolite from Commercial Ammoximation Process by Encapsulating Amorphous TiO 2 ‐SiO 2 Nanoparticles inside Zeolite Crystal
Author(s) -
Xia Changjiu,
Lin Min,
Peng Xinxin,
Zhu Bin,
Xu Guangtong,
Shu Xingtian
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600283
Subject(s) - zeolite , materials science , nanoparticle , catalysis , chemical engineering , amorphous solid , hydrothermal circulation , titanium , hydrothermal synthesis , crystal (programming language) , inorganic chemistry , nanotechnology , organic chemistry , chemistry , metallurgy , programming language , computer science , engineering
An efficient regeneration method to encapsulate the poisonous amorphous TiO 2 ‐SiO 2 nanoparticles within zeolite crystal via post‐synthesis has been developed. It is demonstrated that the encapsulation of Ti‐rich nanoparticles can reduce the accessibility of H 2 O 2 molecules to acid sites of Ti‐rich nanoparticles, thus lowering the inefficient decomposition of H 2 O 2 oxidant during catalytic reactions. Furthermore, the regenerated HTS zeolite is of smaller particle size than conventional TS‐1 zeolite due to the existence of deactivated HTS as crystal seed during hydrothermal synthesis. Consequently, the regenerated HTS zeolite shows as high catalytic performance as fresh TS‐1 zeolite in phenol hydroxylation reaction with 30 wt% H 2 O 2 aqueous solution as oxidant. Importantly, this study exploits a novel concept on updating the lifetime of industrial zeolite catalyst, which is of both academic and practical significance.