海绵钯表面CO、O2、CH4的吸附特性

Adsorption Isotherms for CO 2, O, and CH4 on Porous Palladium

摘要:

在300 K和0~13.3 kPa压力范围内，测量了海绵钯表面对CO、O2、CH4的吸附等温线。结果表明：钯表面对CO的吸附量先随压力的升高而增加，之后呈现饱和吸附状态；对O2的吸附至少可以分3个区间，在0~100 Pa压力区间，吸附量随压力升高快速增加，此后直至4 kPa的区间内，吸附量随压力升高较缓慢增加，但当压力高于4 kPa时，吸附量随压力的升高而增加又变得较为显著；CH4的吸附量相对较小，并持续随压力升高而缓慢增加。在整个压力测量区间，CO、CH4的吸附等温线符合兰缪尔模型，而O2的吸附等温线只

Abstract:

At 300 K and between 0~13.3 kPa, adsorption isotherms for O2, CO, CH4 on porous palladium were measured by using PVT method in low-vacuum system. The results indicate that Adsorption isotherms for CO on Pd is identical with the type adsorption isotherms that the amount adsorbed of CO increases with increasing pressure(<2.6 kPa), but little additional CO adsorbs with pressure increasing(<13.3 kPa). Isotherm for adsorption of O2 or CH4 has a different effect in contrast to CO, i.e. significant adsorption of O2 even at low pressure (<100 Pa), and the isotherms doesn’t saturate at higher pressure(<13.3 kPa), and the amount adsorbed of CH4 is little and increases slightly with equilibrium pressure rising sharply (<13.3 kPa). And isotherm for adsorption of CO or CH4 can been classified Longmuir adsorption type, and that of O2 can been described by Longmuir adsorption model only when equilibrium pressure is less than 1.33 kPa