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Pure H 2 production through hollow fiber hydrogen‐selective MFI zeolite membranes using steam as sweep gas
Author(s) -
Zhang Yuting,
Sun Qi,
Gu Xuehong
Publication year - 2015
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14924
Subject(s) - steam reforming , membrane , zeolite , hydrogen , permeation , chemistry , chemical engineering , hydrogen production , membrane reactor , fiber , diffusion , materials science , volumetric flow rate , hollow fiber membrane , analytical chemistry (journal) , chromatography , catalysis , thermodynamics , organic chemistry , engineering , biochemistry , physics
Hollow fiber MFI zeolite membranes were modified by catalytic cracking deposition of methyldiethoxysilane to enhance their H 2 /CO 2 separation performance and further used in high temperature water gas shift membrane reactor. Steam was used as the sweep gas in the MR for the production of pure H 2 . Extensive investigations were conducted on MR performance by variations of temperature, feed pressure, sweep steam flow rate, and steam‐to‐CO ratio. CO conversion was obviously enhanced in the MR as compared with conventional packed‐bed reactor (PBR) due to the coupled effects of H 2 removal as well as counter‐diffusion of sweep steam. Significant increment in CO conversion for MR vs. PBR was obtained at relatively low temperature and steam‐to‐CO ratio. A high H 2 permeate purity of 98.2% could be achieved in the MR swept by steam. Moreover, the MR exhibited an excellent long‐term operating stability for 100 h in despite of the membrane quality. © 2015 American Institute of Chemical Engineers AIChE J , 61: 3459–3469, 2015