SBA-15/CMS composite membrane for H2 purification and CO2 capture: Effect of pore size, pore volume, and loading weight on separation performance

摘要

This study investigated the effect of the SBA-15 filler texture on the gas separation performance of poly-phenyiene oxide (PPO)-derived composite CMS membranes, specifically on hydrogen separation and carbon capture. Four types of SBA-15 fillers were synthesized via the template method using different aging temperatures. The results indicate that the pore size, pore volume, and Si-OH groups of the SBA-15 silica affected the final amorphous carbon structure, which led to better gas separation performance. SBA-15 prepared at 120 °C had better separation performance than SBA-15 prepared at the other aging temperatures. The silica structures create void spaces and nanopore channels in the resultant carbon film and cross-link with polymer chains, resulting in excellent ideal separation performance. The effect of the SBA-15 loading weight, which was varied from 0.025 to 0.4 wt%, was also investigated. The results show that the H2 permeability through PPO/SBA-15 remarkably increased from 319 to 2420 Barrer [1 Barren 1 × 10~(10) cm~3 (STP) cm/(cm~2 s cmHg)] with increasing loading weight from 0.025 to 0.1 wt%.