02375nas a2200241   4500008004100000022001400041245011000055210006900165260000900234300001200243490000700255520154900262653001401811653002301825653002601848653001101874653002301885653003001908100002401938700002001962700002601982856012502008       2024                        eng d  a0360-319900aPressure swing adsorption of Li exchange hierarchical X zeolite for pure hydrogen from binary gas mixture0 aPressure swing adsorption of Li exchange hierarchical X zeolite   cJUL   a138-1470 v733 a<p>
	This study reports the separation of pure hydrogen (H2) employing pressure swing adsorption (PSA). The Li-X and Li-hierarchical X (Li-H-X) zeolite were prepared by an ion exchange process. The sorbents were evaluated through several experiments including, breakthrough, empty bed contact time (EBCT), single-bed, and two-bed PSA with different steps. The effect of pressure, purity, and recovery relationship was developed. The highpressure PSA study was performed at 4, 6, and 10 bar with varying feed flow rates to assess their efficacy in pure H2 separation using binary gas stream (H2/CO2, 75/25 vol.%). The breakthrough adsorption capacity of Li-H-X exhibited 3.4 mmol g-1 and 0.212 mmol g-1 of CO2 and H2, respectively. Li-H-X shows -8% higher CO2 sorption capacity than the Li-X sorbent at 1 bar and 300 K due to the large meso-microporous structure of the sorbent. The two-bed PSA purity and recovery were found higher than single-bed PSA. Using two-bed PSA, the Li-H-X achieved a 99.5% of purity, 92.9% of recovery, and 10.4 mL min-1 g-1 of productivity, which was -16% higher recovery and productivity than single-bed PSA at a flow rate of 1200 mL min-1 at 6 bar. With increasing the pressure and flow rate, the recovery of Li-H-X was enhanced up to 93.7% with 99.1%-99.9% H2 purity. The long-term PSA was run using Li-H-X sorbent for 7.5 h with 230 cycles with H2 purity between 98.5 and 99.5% at 6 bar. Interestingly, the adsorbent shows the scalability of PSA for efficient H2 separation for a binary mixture of H2/CO2.</p>
10aadsorbent10aBinary gas mixture10aHydrogen purification10aLi-H-X10aMesoporous zeolite10aPressure swing adsorption1 aShrotri, Aadesh, R.1 aBirje, Amit, R.1 aNandanwar, Sachin, U.  uhttps://library.ncl.res.in/content/pressure-swing-adsorption-li-exchange-hierarchical-x-zeolite-pure-hydrogen-binary-gas02284nas a2200229   4500008004100000022001400041245013800055210006900193260000800262300001200270490000800282520147000290653001401760653002201774653002301796653002201819653002201841653001601863100002401879700002601903856012501929       2025                        eng d  a0360-319900aOptimizing H2/CO2 binary gas mixture separation using Li-K-ETS-10 zeolite: Breakthrough analysis and impact of operational conditions0 aOptimizing H2CO2 binary gas mixture separation using LiKETS10 ze  cMAR  a673-6830 v1053 a<p>
	The polycation-exchanged ETS-10 (Li-K-ETS-10) zeolite was employed as a sorbent in breakthrough experiments using a binary H2/CO2 (75/25%) gas mixture. The data compared with parent adsorbent (NaK)-ETS-10, and mono cation exchange of ETS-10 (K-ETS-10 and Li-ETS-10). Adsorbents underwent for various characterization including XRD, Raman, FTIR, EDS, CO2-TPD, BET surface area, and pore diameter of samples to understand the physicochemical properties. CO2-TPD shows that Li-K-ETS-10 has higher basicity than parent (NaK)-ETS-10. The process parameters were optimized to ensure a higher CO2 sorption capacity and better H2 purity including effects of flow rate, pressure, temperature, feed concentration, bed height, and recyclability. The adsorption capacities of CO2 and H2 were found to be 1.57 mmol g- 1 and 0.24 mmol g-1, respectively, at 1 bar and a flow rate of 200 mL min- 1. These values represent a 40% improvement over (NaK)-ETS-10 and a-10.4% improvement over Li-ETS-10. At 6 bar, the CO2 and H2 adsorption capacities reached 2.79 mmol g- 1 and 0.22 mmol g-1, respectively. The higher CO2 sorption over Li-K-ETS-10 leads due to improve in basic sites and physical properties of sample compare to studied adsorbent. The experimental data of binary gas mixture was used to evaluate the kinetic models including Thomas, and Yoon-Nelson. This results implies that Li-K-ETS-10 is the promising candidates for H2 separation from binary gas mixture.</p>
10aadsorbent10aBinary gas stream10aBreakthrough study10aH2/CO2 separation10aKinetic modelling10aLi-K-ETS-101 aShrotri, Aadesh, R.1 aNandanwar, Sachin, U.  uhttps://library.ncl.res.in/content/optimizing-h2co2-binary-gas-mixture-separation-using-li-k-ets-10-zeolite-breakthrough