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采用溶胶-凝胶法制备了WO3/TiO2纳米复合催化剂,通过XRD、IR、UVDRS技术对材料的表面性质与构造、光响应性能进行了表征,并研究了该催化剂作用下光催化甲烷和水生成甲醇的反应性能;考察了煅烧温度、WO3掺杂量对光催化活性的影响,并研究了反应条件对甲醇产量的影响。结果表明:掺入WO3使TiO2光催化活性提高,扩大了光激发波长范围;催化剂煅烧温度为600℃、WO3摩尔分数为3%时,光催化性能最佳;在紫外光照射下,光激发WO3/TiO2表面产生光生空穴,催化甲烷转化为甲醇,甲烷转化率为16.2%,对甲醇的选择性达到76%。
The WO3 / TiO2 nanocomposite catalysts were prepared by sol-gel method. The surface properties, structure and photo-responsive properties of the composites were characterized by XRD, IR and UVDRS. The photocatalytic activities of methane and water Methanol. The effect of calcination temperature and amount of WO3 on the photocatalytic activity was investigated. The effect of reaction conditions on the yield of methanol was also investigated. The results showed that the photocatalytic activity of WO3 increased with the addition of WO3 and the optical excitation wavelength range was broadened. When the calcination temperature of the catalyst was 600 ℃ and the mole fraction of WO3 was 3%, the photocatalytic activity was the best. Under UV irradiation, / TiO 2 surface generated photo-generated holes, catalytic methane into methanol, methane conversion was 16.2%, the selectivity of methanol reached 76%.