Binary adsorption of CO₂/CH₄ in binderless beads of 13X zeolite

详细信息    查看全文

• 作者：Jos茅 A.C. Silva ; Adelino F. Cunha ; Kristin Schumann ; Al铆rio E. Rodrigues
• 关键词：Binderless 13X zeolite ; Binary adsorption of CO2/CH4 ; Fixed bed adsorption ; Selectivity CO2/CH4
• 刊名：Microporous and Mesoporous Materials
• 出版年：15 March, 2014
• 年：2014
• 卷：187
• 期：Complete
• 页码：100-107
• 全文大小：812 K

文摘

The binary sorption CO₂ and CH₄ in binderless beads of 13X zeolite has been investigated between 313 and 473 K and total pressure up to 5 atm through fixed bed adsorption experiments. The amount adsorbed of CO₂ and CH₄ is around 4.7 mmol/g_ads and 0.4 mmol/g_ads, respectively, at 313 K and 3.7 atm in a 50/50 equimolar mixture. In a 25(CO₂)/75(CH₄) mixture the amount adsorbed is 4.0 and 0.84 mmol/g at the same temperature and pressure. Experimental selectivities CO₂/CH₄ range from 37 at a low pressure of 0.667 atm to approximately 5 at the high temperature of 423 K. Comparing these values with the ones in literature CO₂ adsorption capacity is 20% higher than in CECA 13X binder pellets. The CO₂/CH₄ binary isotherms were fitted with the extended Fowler model that takes into account interaction between adsorbed molecules at adjacent sites suggesting a moderate attraction between CO₂ and CH₄. The model is validated through a graphical method using the single component isotherm parameters. The breakthrough curves measured show a plateau of pure CH₄ of approximately 6 min depending of the operating conditions chosen.