CH_4/N_2 separation on methane molecules grade diameter channel molecular sieves with a CHA-type structure |
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| Authors: | Hua Shang Yuping Li Jiaqi Liu Xuan Tang Jiangfeng Yang Jinping Li |
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| Affiliation: | 1.Research Institute of Special Chemicals, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;3.Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, China |
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| Abstract: | Samples of methane molecules grade diameter channel CHA-type molecular sieves (Chabazite-K, SAPO-34 and SSZ-13) were investigated using the adsorption separation of CH4/N2 mixtures. The isotherms recorded for CH4 and N2 follow a typical type-Ι behavior, which were fitted well with the Sips model (R2>0.999) and the selectivity was calculated using IAST theory. The results reveal that Chabazite-K has the highest selectivity (SCH4/N2=5.5). SSZ-13 has the largest capacity, which can adsorb up to a maximum of 30.957 cm3·g-1 (STP) of CH4, due to it having the largest pore volume and surface area, but the lowest selectivity (SCH4/N2=2.5). From the breakthrough test, we can conclude that SSZ-13 may be a suitable candidate for the recovery of CH4 from low concentration methane (CH4<20%) based on its larger pore volume and higher CH4 capacity. Chabazite-K is more suited to the separation of high concentration methane (CH4>50%) due to its higher selectivity. |
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| Keywords: | Molecular sieves Adsorption CH4/N2 Separation Breakthrough |
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