Synthesis, characterization and corrosion performance evaluation of DDR membrane for H 2 separation from HI decomposition reaction

Closed form solutions of convection‐diffusion mechanisms in two dimensions for H2 separation from (H2/CO2) mixture at room temperature

“…, were found to be consistently below five, [29] which is lower than the value reported by Muhammad et al [30] The microwave-assisted DDR zeolite membrane synthesis is also an interesting pathway towards reducing the processing time of the reaction. Few mathematical models of membrane-based gas separation processes are primarily dedicated towards finding the molar diffusivities for mixture of light gases and pure gases.…”

“…71-0962. [29] Therefore, the formation of crystalline DDR zeolite layer on the pre-existing clay-alumina tubular support, which was seeded on the support within 2 days, was confirmed by the XRD study.…”

Fast synthesis of submicron all-silica CHA zeolite particles using a seeding method

“…For example, the pore aperture of zeolite SAPO-34 (CHA structure with 8-MR pores) is $0.38 nm, which allows the selective diffusion of CO 2 (kinetic diameter 0.33 nm) to the inner pore structure, while excluding the larger CH 4 (0.38 nm) molecule. 6 Among 8-MR zeolites, SAPO-34 (CHA type), [6][7][8][9][10][11][12][13][14] CHA [15][16][17] and DDR membranes [18][19][20][21][22] have been extensively studied for CO 2 separation. Great CO 2 -CH 4 separation performance was realized on SAPO-34 zeolite membrane; however, the hydrophilic nature of SAPO-34 zeolite makes it difficult for the application of SAPO-34 membrane for natural gas separation.…”

Small-Pore Zeolite Membranes: A Review of Gas Separation Applications and Membrane Preparation

“…The DDR membrane was defective after calcination. The membrane was repaired by chemical vapor deposition (CVD) with silica for six days at 823 K. The high H 2 /CO 2 selectivity, which was not observed by other researchers for DDR zeolite membranes [118,119], might be caused by a continuous amorphous silica film acting as an effective membrane for H 2 /CO 2 separation. [101,[115][116][117][118][119][120][121][122][123].…”

“…Figure3. H 2 /CO 2 separation performance for different types of small-pore zeolite membranes[101,[115][116][117][118][119][120][121][122][123]. * denotes results from pure gas permeation tests.…”