High-pressure sour gas adsorption on zeolite 4A

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• 作者：Kyle G. Wynnyk ; Behnaz Hojjati ; Payman Pirzadeh ; Robert A. Marriott
• 关键词：Sour gas conditioning ; Zeolite 4A ; Adsorption ; High ; pressure ; Hydrogen sulfide ; Carbonyl sulfide ; Carbon dioxide ; Methane
• 刊名：Adsorption
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：23
• 期：1
• 页码：149-162
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Industrial Chemistry/Chemical Engineering; Surfaces and Interfaces, Thin Films; Engineering Thermodynamics, Heat and Mass Transfer;
• 出版者：Springer US
• ISSN：1572-8757
• 卷排序：23

文摘

In an effort to measure self-consistent adsorption isotherms for sour gas species on zeolite 4A, two high-pressure manometric adsorption instruments have been built for measurement up to p = 225 bar. A comparison of CO₂ adsorption up to p = 200 bar on Fitrasorb F400 activated carbon shows the reliability of these instruments. For the purpose of this work, high purity zeolite 4A was synthesized and characterized by SEM/EDX, XRD, FTIR, and DLS. High-pressure adsorption isotherms (absolute and excess) for CO₂, COS, CH₄ and H₂S adsorption on zeolite 4A have been reported for T = 0, 25, and 50 °C along with corresponding parameters for the modified Tóth isotherm. The adsorption of COS on zeolite 4A showed some unexpected results, where (i) lower temperature isotherms were dominated by size effects, (ii) the adsorption capacity was half that of CO₂ or H₂S, and (iii) computational calculations for HOMO bond orientation indicate that COS should be excluded from zeolite 4A, despite the experimental results.