Poly(amidoamine) (PAMAM) dendrimers were incorporated into a cross-linked poly(vinyl alcohol) (PVA) matrix to improve CO 2 separation performance at elevated pressures. An organic metal compound was selected as a cross-linker of PVA. The resulting self-standing PAMAM/ cross-linked PVA membrane containing 41.6wt% of PAMAM dendrimer had both good pressure tolerance and CO 2 permeance. The CO 2/H 2 selectivity was almost constant when the CO 2 partial pressure in feed gas was from 80 to 560kPa at 40°C. CO 2/H 2 selectivity and CO 2 permeance of the membrane were 32 and 1.6×10 -12m 3(STP)/(m 2sPa), respectively, at 560kPa CO 2 partial pressure in the feed gas. Both CO 2 permeance and CO 2/H 2 selectivity increased as the operation temperature of the membrane was increased from 25 to 60°C. A membrane containing 63.3wt% of the dendrimer showed CO 2/H 2 selectivity and CO 2 permeance of 42 and 1.2×10 -11m 3(STP)/(m 2sPa), respectively, at 560kPa of CO 2 partial pressure and 60°C. The PAMAM/ cross-linked PVA hybrid membranes are durable under high pressure operation and thus show promise for applications requiring the separation of CO 2 from H 2 under pressurized conditions, such as in the integrated coal gasification combined cycle (IGCC) processes.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation