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Effect of impurities on ultra-pure hydrogen production by pressure vacuum swing adsorption
Ayub Golmakani,Seyed Ali Nabavi,Vasilije Manovi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
The most viable technology for production of ultra-pure hydrogen (>99.99%), required for fuel cells, issteam methane reforming (SMR) coupled with pressure vacuum swing adsorption (PVSA). A PVSAprocess with a two-layer bed of activated carbon (AC)/zeolite 5A for ultra-pure hydrogen production fromsyngas was developed and simulated with the aim of exploring the effect of impurities on energyintensity of the process. The simulated concentration profiles showed that CH4 was removed by thefirsthalf of the AC layer, CO2 and CO were mostly removed by the end of that layer, but zeolite 5A (the secondlayer) could not completely remove the remaining N2. Further, the effect of the N2 on performance of thePVSA process was demonstrated by simulating purification of two feeds with 3.1 and 1.1 vol% N2,respectively. The 2% drop in N2 concentration in the syngas feed resulted in decreased energyconsumption of the PVSA process from 940 kJ/kg to 430 kJ/kg H2, while H2 recovery increased from 47% to55%. Therefore, the presence of N2 has a very large impact on recovery and energy intensity of the ultrapurehydrogen production process, and development of adsorbents with better N2 removal performanceis required.
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