在常温下制备了具有不同钛含量的大比表面积和孔体积的介孔分子筛HMS.XRD谱表明，这些Ti-HMS样品呈现出很好的六方晶形.经焙烧后，Ti-HMS样品的UV吸收光谱和XAFS谱结果表明，在Ti-HMS(1)和Ti-HMS(2)骨架中的钛离子以四配位存在，而在Ti-HMS(10)中至少有部分钛是以六配位存在.在NO存在的情况下，在273K下光催化剂Ti-HMS受紫外光照射后，导致NO分解生成N2，O2和N2O.实验结果表明，具有高分散四配位钛的Ti-HMS(1)使NO以高效率、高选择性分解生成N2和O2;随着钛含量的增加，其光催化活性反而降低.
Various Ti-containing HMS mesoporous molecular sie ves, havinglarge surface area and pore volume, have been prepared at ambient te mp erature. The Ti-HMS samples exhibited a well-defined XRD pattern typical of he xagonal lattice. UV-Vis and XAFS spectra of the calcined Ti-HMS samples indi cated that the Ti ions are tetrahedrally coordinated in the framework of HMS for Ti-HMS(1) and Ti-HMS(2), while for Ti-HMS(10), at least a fraction of Ti ion s is in octahedral coordination. UV irradiation on the Ti-HMS samples in the presence of NO at 273 K led to decomposition o f NO to N2, O2, and N2O with different yields and distributions. The photocatalytic performance of the TiO2 appears to be c ompletely modified by the incorporation structure and the reaction environment. High efficiency and selectivity for formation of N2 and O2 in the photocat alytic decomposition of NO were achieved over Ti-HMS(1) having highly dispe r sed tetrahedral titanium species, but the activity decreased with the increase of Ti content in the sample.
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