【摘要】 选用Pt为活性组分,γ-Al2O3、γ-Al2O3-碳纳米管(CNT)和活性碳纤维布(ACC)为载体,制备了用于热电薄膜氢气传感器的负载型Pt催化剂,研究了3种载体对负载型Pt催化剂活性的影响。实验结果表明,在载体中加入CNT可有效提高负载型Pt催化剂的活性;ACC的高比表面积使Pt/ACC催化剂的活性最高。确定了Pt/ACC催化剂的最佳制备条件:Pt质量分数19.9%,还原温度180℃,还原时间3h。将Pt/ACC催化剂与热电薄膜结合进行氢敏性能测试,测试结果显示,使用Pt/ACC催化剂的热电薄膜氢气传感器在室温下即具有优异的性能,在30℃下表现出最高的饱和温差(47℃)和快速响应与恢复性能;在160℃以下对工作气体的选择性极佳。更多还原

【Abstract】 Supported Pt catalysts used in thermoelectric film hydrogen sensor were prepared by sol-gel method and impregnation separately.Effects of three supports,namely γ-Al2O3,γ-Al2O3-carbon nanotube(CNT)and active carbon fiber fabric(ACC),on catalyst activity were investigated.CNT can effectively enhance activity of the catalyst.ACC with high specific surface area results in the highest activity of Pt/ACC catalyst.Optimal conditions for preparation of Pt/ACC catalyst were:Pt mass fraction 19.9%,reduction temperature 180 ℃ and reduction time 3 h.Pt/ACC catalyst in thermoelectric film hydrogen sensor exhibits excellent hydrogen-sensing properties at room temperature with high temperature difference(47 ℃)output,quick response and recovery capability.The selectivity to hydrogen gas on Pt/ACC catalyst is very good below 160 ℃.更多还原