介孔ZnO制备方法对ZnO负载的Pd催化剂甲醇水蒸气重整性能的影响

以三嵌段高聚物F-127为模板剂,采用水热法和沉淀法分别合成了介孔氧化锌m-ZnO(H)和m-ZnO(C),再以沉积-沉淀法制备m-ZnO负载的Pd基催化剂,并考察了其甲醇水蒸气重整制氢反应性能。利用XRD、FT-IR和BET等手段对载体及催化剂进行了表征。发现不同制备方法所制得的m-ZnO的性能有较大差异,其中m-ZnO(H)具有较大的BET比表面积、孔容和孔壁厚度。因此,以m-ZnO(H)为载体的Pd基催化剂对甲醇水蒸气重整制氢反应具有较高的催化活性、氢气产率和二氧化碳选择性。

Effects of preparation methods of mesoporous ZnO on methanol steam reforming performances of ZnO supported Pd catalysts

Using triblock copolymer Pluronic F-127(F-127) as template reagent, mesoporous zinc oxide m-ZnO(H) and m-ZnO(C) were synthesized by hydrothermal and precipitation methods, respectively. Pd-based catalysts supported on m-ZnO(H) and m-ZnO(C) supports were prepared by deposition-precipitation method and their catalytic performances for steam reforming of methanol were investigated. The as synthesized samples were characterized by means of BET, FT-IR and XRD methods. It was found that preparation methods had marked influence on the properties of the m-ZnO. Comparing with m-ZnO(C) prepared by precipitation method, m-ZnO(H) prepared by hydrothermal method had larger BET surface area, pore volume and thickness of pore wall, thus Pd/m-ZnO catalyst had higher catalytic activity, hydrogen yield and carbon dioxide selectivity for steam reforming of methanol.