Effect of propane on the kinetics of carbon dioxide adsorption in NaA zeolites

A.Yu. Khodakov, L.V.C. Rees
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引用次数: 11

Abstract

Results obtained in a batch adsorption system with constant volume showed that preadsorption of small amounts of propane on NaA zeolite can significantly slow down the rate of carbon dioxide uptake. The observed decrease in the carbon dioxide uptake rate was related to a decrease in accessibility of the external surface of the microcrystallites due to the effect of an external film resistance created by the preadsorbed propane molecules. Small amounts of preadsorbed propane localized inside the zeolite microcrystallites were found to have no affect on the CO2 adsorption rate. Experiments carried out using the frequency response technique confirmed the significant influence of the external film resistance on the kinetics of adsorption of carbon dioxide/propane mixtures on 4A zeolite even at low propane concentrations (2–3%).

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丙烷对NaA沸石吸附二氧化碳动力学的影响
在定容间歇式吸附系统中获得的结果表明,NaA沸石上预吸附少量丙烷可以显著减缓二氧化碳的吸收速度。所观察到的二氧化碳吸收率的降低与微晶外表面可接近性的降低有关,这是由于预吸附丙烷分子产生的外膜阻力的影响。少量丙烷预吸附在沸石微晶内部,对CO2的吸附速率没有影响。利用频率响应技术进行的实验证实,即使在低丙烷浓度(2-3%)下,外膜阻力对二氧化碳/丙烷混合物在4A沸石上的吸附动力学也有显著影响。
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