Improvement in thermal stability and catalytic activity of titanium species in mesoporous titanosilicates by addition of ammonium salts
Improvement in thermal stability and catalytic activity of titanium species in mesoporous titanosilicates by addition of ammonium salts
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DOI：
10.1016/j.jcat.2006.09.007
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发表时间：
2006-12-10
影响因子：
7.3
通讯作者：
Tatsumi, Takashi
中科院分区：
文献类型：
--
作者：
Meng, Xiangju;Fan, Weibin;Tatsumi, Takashi
Mesoporous titanosilicates (MTS-9A) with thermally stable titanium species were synthesized by adding ammonium salts in the preparation procedure. Characterization results show that hexagonal mesoporous titanosilicates (MTS-9A) contain primary and secondary structural building units of zeolite in the framework, in a similar manner to MTS-9. The promoted condensation of Ti-containing silica network in MTS-9A leads to higher thermal stability of four-coordinated titanium species compared with MTS-9, as evidenced by UV-vis and Si-29 NMR spectra. Catalytic tests indicate that MTS-9A samples show high activity in hydroxylation of both small (phenol) and bulky reactants (2,3,6-trimethylphenol) before and after calcination. Moreover, the recycled catalyst retains high conversion, confirming the high thermal stability of titanium species. (c) 2006 Elsevier Inc. All rights reserved.
