Mesoporous titanosilicate nanoparticles: facile preparation and application in heterogeneous epoxidation of cyclohexene
文献类型:期刊论文
作者 | Jiang, Yanqiu1; Zhao, Yong1; Xu, Xianzhu1; Lin, Kaifeng1; Wang, Dan2 |
刊名 | RSC ADVANCES
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出版日期 | 2016 |
卷号 | 6期号:81页码:77481-77488 |
ISSN号 | 2046-2069 |
英文摘要 | 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. |
WOS标题词 | Science & Technology ; Physical Sciences |
类目[WOS] | Chemistry, Multidisciplinary |
研究领域[WOS] | Chemistry |
关键词[WOS] | MOLECULAR-SIEVES ; HOLLOW SPHERES ; SILICA NANOPARTICLES ; CONTROLLED MORPHOLOGIES ; MESOSTRUCTURED SILICA ; HIERARCHICAL ORDER ; CATALYTIC-ACTIVITY ; CATIONIC POLYMER ; TI-MCM-41 ; MCM-41 |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000382482200040 |
源URL | [http://ir.ipe.ac.cn/handle/122111/21474] ![]() |
专题 | 过程工程研究所_多相复杂系统国家重点实验室 |
作者单位 | 1.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 |
推荐引用方式 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. |
入库方式: OAI收割
来源:过程工程研究所
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