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Mesoporous titanosilicate nanoparticles: facile preparation and application in heterogeneous epoxidation of cyclohexene
Jiang, Yanqiu1; Zhao, Yong1; Xu, Xianzhu1; Lin, Kaifeng1; Wang, Dan2
2016
Source PublicationRSC ADVANCES
ISSN2046-2069
Volume6Issue:81Pages:77481-77488
Abstract

Mesoporous titanosilicate nanoparticles with a size of 40 to 75 nm (Nano-Ti-MCM-41) were hydrothermally synthesized from a titanosilicate (TiSil) solution with cetyltrimethylammonium bromide (CTAB) as the template and with a cationic polymer as the size-controlling agent. The particle size is proposed to be controlled by adjusting the size of TiSil-CTA(+) micelles influenced by the charge interaction between negatively charged titanosilicate and polymer cationic ions during the formation of TiSil-CTA+ micelles. The presence of n-hexane and hydrogen peroxide in the preparation process proved to favor a well-ordered mesostructure in these nanoparticles: the mesostructure became disordered without using hexane and hydrogen peroxide although the size of mesoporous titanosilicate particles remained in the nanometer scale. The characterization results showed that Nano-Ti-MCM-41 possesses hierarchical porosity (bimodal mesopores) and an ordered mesoporous structure and that the titanium species are predominately located in tetrahedral framework positions. Nano-Ti-MCM-41 is a highly active catalyst for the epoxidation of cyclohexene with hydrogen peroxide, and displayed higher turnover numbers (TONs) based on the cyclohexene conversions and higher selectivity ratio between cyclohexene epoxide and 1,2-cyclohexanediol compared with traditional Ti-MCM-41 prepared without the cationic polymer. The improved catalytic performances are mainly ascribed to the decrease in the particle size of Ti-MCM-41, resulting in the enhanced accessibility of the reactants to the catalytic Ti species via the shorter channels of Nano-Ti-MCM-41 and in the shorter residence time of cyclohexene epoxide in the mesopores of the nanoparticles. Importantly, the mesoporous titanosilicate nanoparticles are stable catalysts immune to titanium leaching, suggesting their good recyclability potential in the epoxidation with aqueous H2O2.

SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1039/c6ra10145c
Indexed BySCI
Language英语
WOS KeywordMOLECULAR-SIEVES ; HOLLOW SPHERES ; SILICA NANOPARTICLES ; CONTROLLED MORPHOLOGIES ; MESOSTRUCTURED SILICA ; HIERARCHICAL ORDER ; CATALYTIC-ACTIVITY ; CATIONIC POLYMER ; TI-MCM-41 ; MCM-41
WOS Research AreaChemistry
WOS SubjectChemistry, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China(51472062 ; Fundamental Research Funds for the Central Universities(HIT. IBRSEM. 201326) ; Program for Science and Technology Innovation Talent in Harbin(2013RFQXJ004) ; 21303031)
WOS IDWOS:000382482200040
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21474
Collection多相复杂系统国家重点实验室
Affiliation1.Harbin Inst Technol, Sch Chem & Chem Engn, MIIT Key Lab Crit Mat Technol New Energy Convers, Harbin 150080, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Yanqiu,Zhao, Yong,Xu, Xianzhu,et al. Mesoporous titanosilicate nanoparticles: facile preparation and application in heterogeneous epoxidation of cyclohexene[J]. RSC ADVANCES,2016,6(81):77481-77488.
APA Jiang, Yanqiu,Zhao, Yong,Xu, Xianzhu,Lin, Kaifeng,&Wang, Dan.(2016).Mesoporous titanosilicate nanoparticles: facile preparation and application in heterogeneous epoxidation of cyclohexene.RSC ADVANCES,6(81),77481-77488.
MLA Jiang, Yanqiu,et al."Mesoporous titanosilicate nanoparticles: facile preparation and application in heterogeneous epoxidation of cyclohexene".RSC ADVANCES 6.81(2016):77481-77488.
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