Local Structures of Active Sites on Ti-MCM-41 and Their Photocatalytic Reactivity for the Decomposition of NO
Local Structures of Active Sites on Ti-MCM-41 and Their Photocatalytic Reactivity for the Decomposition of NO
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Ti-MCM-41活性位点的局部结构及其光催化分解NO的反应活性
DOI：
10.1023/b:catl.0000004111.02392.75
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发表时间：
2003
影响因子：
2.8
通讯作者：
M. Anpo
中科院分区：
文献类型：
--
作者：
Yun Hu;S. Higashimoto;G. Martra;Jinlong Zhang;M. Matsuoka;S. Coluccia;M. Anpo
采用XAFS、FT-IR和光致发光等方法对室温下制备的Ti含量为0.15- 2.00wt%的Ti-MCM-41介孔分子筛进行了表征。对于Ti含量高达0.60重量%，孤立的四面体配位的钛氧化物物种被发现形成在MCM-41网络结构，而在更高的钛含量，二聚体或低聚体的钛氧化物物种，与Ti（IV）在四面体协调，成为压倒性的。结果发现，只有高度分散的孤立的四面体配位的钛氧化物物种作为活性位点的NO光催化分解成N2和O2。
The characterization of mesoporous Ti-MCM-41 prepared at ambient temperature, with Ti contents in the 0.15–2.00 wt% range, was carried out using XAFS, FT-IR and photoluminescence methods. For Ti contents up to 0.60 wt%, isolated tetrahedrally coordinated Ti-oxide species was found to be formed in the MCM-41 network structures, while at higher titanium contents, dimeric or oligomeric Ti-oxide species, with Ti (IV) in tetrahedral coordination, became overwhelming. It was found that only the highly dispersed isolated tetrahedrally coordinated Ti-oxide species act as active sites in the photocatalytic decomposition of NO into N2 and O2.