Adsorption Properties of Modified Clinoptilolite for Methane and Nitrogen

Autor:	Zhang Yinnian, Xueqin Liu, Hu Hongjie, Xiaofei Hao, Limei Wu, Zhen Li
Jazyk:	angličtina
Rok vydání:	2018
Předmět:	Coalbed methane clinoptilolite chemistry.chemical_element 02 engineering and technology 010402 general chemistry lcsh:Technology 01 natural sciences Methane Article chemistry.chemical_compound Adsorption General Materials Science ion-exchange nitrogen/methane separation lcsh:Microscopy lcsh:QC120-168.85 Clinoptilolite Aqueous solution lcsh:QH201-278.5 lcsh:T 021001 nanoscience & nanotechnology Nitrogen 0104 chemical sciences Pressure swing adsorption chemistry Chemical engineering lcsh:TA1-2040 Gravimetric analysis lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971
Zdroj:	Materials Volume 11 Issue 10 Materials, Vol 11, Iss 10, p 2024 (2018)
ISSN:	1996-1944
Popis:	Coalbed methane (CBM) is a kind of unconventional gas. CBM often contains a great deal of air when it comes out of the well. So, it must be condensed and purified before it can be applied. In this paper, raw clinoptilolite (Cp) was treated with grinding, gravimetric concentration, and ion-exchange using different aqueous solutions of salts. Then, the modified Cp powder was prepared into particles as adsorbents. Then, the adsorbents were used for nitrogen/methane separation in pressure swing adsorption (PSA) at the same condition of 0.2 MPa and 298 K. Research results indicated that there were micropores and lots of mesopores in the Cp, and the pores were mainly slit holes formed by sheet stacking. The adsorbents of NH4-Cp, Cs-Cp, and Cu-Cp showed good equilibrium selectivity for CH4, and the equilibrium separation factors of CH4 and N2 were 2.56, 2.31, and 1.95, respectively. The adsorbents of Na-Cp and Ag-Cp showed good equilibrium selectivity for N2, and the equilibrium separation factors of N2 and CH4 were 7.25 and 6.53, respectively. Consequently, the adsorbent of Na-Cp was suitable for nitrogen/methane mixture separation, which could make the concentration of methane concentrated from 19.7% to 30.72%.
Databáze:	OpenAIRE
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