| Synthesis of AlPO-18 Zeolite Membrane by Sonication-
Assisted Hydrothermal Method for H2 Separation from
Blast Furnace Flue Gas |
Hillol Acharjee,a, b Biswajit Majee,b Jugal Kishore Dasb, c and Nandini Dasa, b, *
Pages : 166-177
DOI : 10.1080/0371750X.2024.2369577 |
| Abstract |
| In this study, AlPO-18 zeolite has been synthesized at temperatures ranging from
140o to 180oC and varying synthesis time from 3 to 20 h using sonication mediated
hydrothermal process. The characterization results of the synthesized powders and
membranes revealed that phase pure AlPO-18 zeolite has been formed at 150oC for
15 h under sonication energy of 250 W. For comparison, the same has been synthesized
by the conventional method for 200oC and 69 h. In the sonochemical process, H2O
molecule splits into hydrogen radicals (H•) and hydroxyl (•OH) radicals with intense
local heating and high pressure during the collapsing of cavitation, which initiates
the formation of dihydrogen phosphite (H2PO3•) and dihydrogen phosphate (H2PO4•)
radicals and facilitate the formation of AlPO-18 zeolite. Finally, the performance of the
membranes has been studied with varying feed pressures for different binary gas
mixtures and single gases, and simulated blast furnace (BF) gas has been used to
study the separation efficiency of the membranes. The highest separation factors,
calculated from BF mixture gas of H2/CO2 and H2/N2 have been achieved as 8.7 and 21,
respectively. These results show the possibility of hydrogen recovery from BF flue
gas to convert waste to wealth.
[Keywords: AlPO-18 zeolite, Membrane, Sonochemical process, Blast furnace flue
gas, H2 enrichment] |
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