期刊
ACS APPLIED MATERIALS & INTERFACES
卷 3, 期 6, 页码 2154-2160出版社
AMER CHEMICAL SOC
DOI: 10.1021/am200380a
关键词
Ti-MCM-41; pore expansion; swelling agent; shape selectivity; organic carbonate
资金
- Natural Science Foundation of China [20506018, 21006068]
- Program of Introducing Talents of Discipline to Universities [B06006]
- National Key Project for the 11th Five Year Plan [2006BAE02B00]
- Program for New Century Excellent Talents in University
This paper describes a method to regulate porosity of Ti-containing mesoporous molecular sieves (Ti-MCM-41) by employing swelling agents that are hydrophobic in nature, such as dodecylamine, n-heptane, and sym-trimethylbenzene (TMB). Physicochemical properties of the samples were investigated using XRD, FT-IR, IR spectra of pyridine absorption, UV-vis, TEM, and N-2 adsorption-desorption techniques. Addition of favorable swelling agents leads to an increase in pore size accompanied by retaining the mesostructure with a certain decrease of structure ordering. Swelling agents also have significant impact on the integration of Ti into the silica framework, which further affect the formation of Lewis acid sites. N-heptane is the most favorable agent for pore expansion of Ti-MCM-41. The material with n-heptane/CTAB ratio of 1 exhibits the largest pore size of 48.3 angstrom, and mesopore volume of 1.266 cm(3)/g and narrow pore-size distribution. We also demonstrated that shape-selective transesterification catalytic activity of Ti-MCM-41 was greatly enhanced because of pore expansion.
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