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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( 1 0 )中至少有部分钛是以六配位存在 .在NO存在的情况下 ,在 2 73K下光催化剂Ti HMS受紫外光照射后 ,导致NO分解生成N2 ,O2 和N2 O .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 .
The mesoporous molecular sieves HMS with large specific surface area and pore volume with different contents of titanium were prepared at room temperature.XRD spectra showed that these Ti HMS samples showed good hexagonal crystal structure.The UV absorption spectra of Ti HMS samples after calcination The results of XAFS spectra show that the titanium ions in the Ti HMS (1) and Ti HMS (2) frameworks exist as tetracoordinates and at least some of the Ti in Ti HMS (10) , The photocatalyst Ti HMS at 2 73K is irradiated by ultraviolet light, which leads to the decomposition of NO to form N2, O2 and N2 O. The experimental results show that Ti HMS (1) with highly dispersed tetrahedral coordination titanium makes NO Highly efficient and highly selective decomposition generates N2 and O2; with the increase of titanium content, the photocatalytic activity decreases.