Gas-phase photo-oxidation of toluene using nanometer-size TiO2 catalysts
Gas-phase photo-oxidation of toluene using nanometer-size TiO2 catalysts
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DOI：
10.1016/s0926-3373(00)00211-3
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发表时间：
2001-02-12
影响因子：
22.1
通讯作者：
Lee, CY
中科院分区：
文献类型：
--
作者：
Maira, AJ;Yeung, KL;Lee, CY
采用改进的溶胶-凝胶法制备了粒径为6、11、16、20 nm的纳米TiO2催化剂。在干燥和潮湿条件下，研究了TiO2粒径对甲苯气相光催化氧化反应的影响。反应的主要产物是二氧化碳和水，但也检测到少量苯甲醛。粒径越小（即6膜），甲苯转化成CO2和H2O的转化率越高，矿化越彻底。6纳米TiO2催化剂具有优异的甲苯光降解性能，主要是由于电子效应和结构效应（即尺寸效应和系综效应）。利用EPR光谱分析了6 nm TiO2与较大尺寸催化剂的结构差异。(C) 2001 Elsevier Science B.V.版权所有
A modified sol-gel process was used to prepare nanostructured TiO2 catalysts of controlled particle size (i.e. 6, 11, 16 and 20 nm). The influence of the TiO2 particle size in the gas phase photocatalytic oxidation of toluene was investigated under both dry and humid conditions. The main products of reaction were carbon dioxide and water, although small amounts of benzaldehyde were also detected. The smaller particle size (i.e. 6 fim) lead to higher conversion and complete mineralization of toluene into CO2 and H2O. Both electronic and structural effects (i.e. size and ensemble effects) are responsible for the excellent performance of 6 nm TiO2 catalyst for toluene photo-degradation. The structural differences between 6 nm TiO2 and larger catalysts were analyzed using EPR spectroscopy. (C) 2001 Elsevier Science B.V. All rights reserved.