Annealing and TMOS coating on PSF/ZTC mixed matrix membrane for enhanced CO₂/CH₄and H₂/CH₄separation

Abstract

Recently, natural gas (mostly methane) is frequently used as fuel, while hydrogen is a promising renewable energy source. However, each gas produced contains impurity gases. As a result, membrane separation is required. The mixed matrix membrane (MMM) is a promising membrane. The huge surface area and well-defined pore structure of zeolite templated carbon (ZTC)-based MMM allow for effective separation. However, the interfacial vacuum in MMM is difficult to avoid, contributing to poor separation performance. This research tries to improve separation performance by altering membrane surfaces. MMM PSF/ZTC was modified by annealing at 120, 150, and 190°C; coating using 0.01, 0.03, and 0.05 mol tetramethyl orthosilicate (TMOS); and a combination of both, i.e. annealing at 190°C and coating using 0.03 mol TMOS. MMM PSF/ZTC successfully significantly improved CO 2 /CH 4 selectivity by a combination of annealing at 190°C and coating 0.03 mol TMOS from 1.37 to 5.90 (331%), and H 2 /CH 4 selectivity by coating with 0.03 mol TMOS from 4.58 to 65.76 (1378%). The enhancement of selectivity was due to structural changes to the membrane that became denser and smoother, which SEM and AFM observed. In this study, annealing and coating treatments are the methods investigated for improving the polymer matrix and filler particle adhesion.

Porous Cu-BTC Metal–Organic Frameworks Anchored on Dialdehyde Wood Sponge as Material for CO2 Capture and Separation

“…Nevertheless, the value of adsorption heats for both fall within the 20–23 and 44–47 kJ/mol ranges, exhibiting relatively small fluctuations. The variation of Q st in the initial low adsorption range provides insights into the uniformity of the surface; a smaller fluctuation in Q st indicates higher uniformity of the adsorption sites. , Because of the strong binding ability of the hydroxyl group to carbon dioxide, the HKUST-1/DWS with a low hydroxyl content has a lower enthalpy of adsorption. A lower Q st value suggests a weaker binding strength, facilitating physical desorption and benefiting material reuse.…”

Decreasing free fatty acid of crude palm oil with polyvinylidene fluoride hollow fiber membranes using a combination of chitosan and glutaraldehyde

“…Due to phase inversion between the coagulation liquid and polymer solution during the dry/wet spinning process, all hollow ber membranes exhibited nger-like pores. 37,38 Coating 0.1 g of CS on a PVDF hollow ber membrane still preserved the nger-like pore structure. Moreover, the addition of CS results in the formation of larger channels inside the nger-like pore.…”

Utilization of polyphenylene sulfide as an organic additive to enhance gas separation performance in polysulfone membranes

“…24 Many studies report the use of inorganic materials as PSf llers to improve the separation performance. [25][26][27] However, employing inorganic ller is challenging due to the incompatibility issue which lead into surface defect and affecting the separation performance. 28 Porous organic materials have potential to be used as membrane ller and can solve the compatibility issues.…”