基于Pt/C/FN疏水催化剂的常温氢氧复合反应

Recombination of H_2 and O_2 Catalyzed by Hydrophobic Pt/C/FN Catalyst at Ambient Temperature

用高压微波加热法制备了w(Pt)=10%的Pt/C催化剂,得到Pt的粒径d=(2.1±0.7)nm,再将Pt/C催化剂与聚四氟乙烯(PTFE)一起负载于泡沫镍(FN),制备疏水催化剂Pt/C/FN。用Pt/C/FN催化常温氢氧复合反应,研究了温度和H2流速对H2转化率的影响。与商用亲水催化剂Pt/Al2O3相比,Pt/C/FN催化剂活性明显更高。潮湿及干燥条件下测试了Pt/C/FN疏水催化剂的活性,潮湿条件下其活性仅有少量下降。富氧条件下考察了CO对Pt/C/FN疏水催化剂活性的影响,CO对H转化率的影响较小。

Pt/C（w（Pt）=10%） catalyst was prepared by microwave heating method at high pressure,and the average size of Pt particles was（2.1±0.7） nm.Then polytetrafluoroethylene（PTFE） and the Pt/C catalyst were supported on foamed nickel（FN） to obtain hydrophobic Pt/C/FN catalyst.The effects of reaction temperature and H2 flow rate on the catalytic activity of the Pt/C/FN catalyst were determined for the recombination reaction of H2-O2 at ambient temperature.The catalytic activity of the hydrophobic Pt/C/FN catalyst is found to be remarkablely higher than that of the commercial hydrophilic Pt/Al2O3 catalyst. Its catalytm activity decreases little under moist environment, compared with dried condition. The influence of CO on its catalytic activity was examined under excess O2. The H2 conversion is influenced by CO slightly.