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   Investigation of Methane Adsorption on Molecular Sieve Zeolite (From Natural Materials)  
نویسنده Esfandian Hossein ,Garshasbi Vahid
منبع Gas Processing Journal - 2020 - دوره : 8 - شماره : 2 - صفحه:35 -50
چکیده    In this study, kaolin, bentonite, and feldspar were used as a lowcost source of si and al to synthesize the molecular sieve 13x. the synthesized zeolites were characterized by xrd, ftir, sem, tga, and bet analysis and used as a suitable adsorbent for ch4 adsorption. the surface areas were 591, 505, 472, and 588 m2/g for natural kaolin (13xk), bentonite (13xb), feldspar (13xf) and commercial molecular sieve 13x (13x–c), respectively. the 13xk had the highest thermal stability than 13xb and 13xf. the adsorption capacities (pressure >20bar) of 13x (kaolin), 13x (bentonite), and 13x(feldspar) were 3.6, 2.4, and 1.95 mmol/g, respectively. the adsorption data were fitted to some isotherms including langmuir, freundlich, sips, bet, and toth. it was found that the sips model showed better fitting in comparison to other models. the thermodynamic of adsorption was also investigated; the positive value of ∆s_ads^0 revealed the increased randomness at the solidsolution interface during the gas adsorption. the thermodynamic study also indicated that the adsorption process was exothermic and spontaneous. the adsorption capacities of synthesized 13x samples were compared to other adsorbents; it was found that 13x–k showed considerable performance and can be introduced as a suitable adsorbent for applications on a large scale.
کلیدواژه Methane ,13x ,Adsorption ,Isotherm ,Thermodynamic
آدرس Amol University Of Special Modern Technologies, Faculty Of Engineering Technologies, Iran, Iran University Of Science And Technology, Faculty Of Chemistry, Iran
پست الکترونیکی garshasbi@iust.ac.ir

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