An efficient regeneration method to encapsulate the poisonous amorphous TiO2-SiO2 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 H2O2 molecules to acid sites of Ti-rich nanoparticles, thus lowering the inefficient decomposition of H2O2 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% H2O2 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. The deactivated HTS zeolite from cyclohexanone ammoximation can be regenerated via encapsulating the toxically amorphous TiO2-SiO2 nanoparticles inside zeolite crystal. It is demonstrated that the encapsulation of Ti-rich nanoparticles reduces the accessibility of H2O2 molecules to acid sites of Ti-rich nanoparticles, thus lowering the inefficient decomposition of H2O2 oxidant during catalytic reactions.

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poisonous amorphous tio2sio2 nanoparticles of tirich nanoparticles synthesis phenol hydroxylation reaction ts1 postsynthesis h2o2 oxidant catalytic reactions industrial zeolite catalyst lifetime toxically amorphous tio2sio2 nanoparticles cyclohexanone ammoximation deactivated hts

Min Lin, Xingtian Shu,Changjiu Xia, Xinxin Peng, Guangtong Xu, Bin Zhu,.Regeneration of Deactivated Hollow Titanium Silicalite Zeolite from Commercial Ammoximation Process by Encapsulating Amorphous TiO2-SiO2 Nanoparticles inside Zeolite Crystal. 1 (14),4192-4187.

Min Lin, et al."Regeneration of Deactivated Hollow Titanium Silicalite Zeolite from Commercial Ammoximation Process by Encapsulating Amorphous TiO2-SiO2 Nanoparticles inside Zeolite Crystal" 1

Min Lin, Xingtian Shu,Changjiu Xia, Xinxin Peng, Guangtong Xu, Bin Zhu,"Regeneration of Deactivated Hollow Titanium Silicalite Zeolite from Commercial Ammoximation Process by Encapsulating Amorphous TiO2-SiO2 Nanoparticles inside Zeolite Crystal"