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首页> 外文期刊>Journal of photochemistry and photobiology, C. Photochemistry reviews >Local structures, excited states, and photocatalytic reactivities of highly dispersed catalysts constructed within zeolites
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Local structures, excited states, and photocatalytic reactivities of highly dispersed catalysts constructed within zeolites

机译：沸石中高度分散的催化剂的局部结构，激发态和光催化反应性

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摘要

Transition metal oxides (Ti, V, Mo, Cr) incorporated within the framework of zeolites as well as transition metal ions (Cu~+, Ag~+, Pr~(3+)) exchanged within the zeolite cavities were found to exhibit high and unique photocatalytic activities for various reactions such as the decomposition of NO_x (NO, N_2O) into N_2 and O_2 or the reduction of CO_2 with H_2O to produce CH_4 and CH_3OH. Various in situ spectroscopic investigations of these catalytic systems using photoluminescence, X-ray absorption fine structure (XAFS) (X-ray absorption near edge structure (XANES) and Fourier transform of EXAFS (FT-EXAFS)), electron spin resonance (ESR), FT-IR, etc. revealed that the photo-excited states of these transition metal oxides or ions play a vital role in these photocatalytic reactions. The photocatalytic reactivity of these oxides and ions in their efficiency and selectivity were found to depend strongly on their local structures, which are controlled by the unique and restricted framework structures of zeolites.
机译：发现掺入沸石骨架的过渡金属氧化物（Ti，V，Mo，Cr）以及在沸石腔内交换的过渡金属离子（Cu〜+，Ag〜+，Pr〜（3+））表现出较高的以及各种反应的独特光催化活性，例如NO_x（NO，N_2O）分解为N_2和O_2或用H_2O还原CO_2以生成CH_4和CH_3OH。使用光致发光，X射线吸收精细结构（XAFS）（X射线吸收近边缘结构（XANES）和EXAFS的傅立叶变换（FT-EXAFS）），电子自旋共振（ESR）对这些催化体系进行各种原位光谱研究FT-IR等揭示了这些过渡金属氧化物或离子的光激发态在这些光催化反应中起着至关重要的作用。发现这些氧化物和离子在其效率和选择性方面的光催化反应性在很大程度上取决于它们的局部结构，该局部结构由沸石的独特且受限制的骨架结构控制。

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