Preparation and performance optimization of Na2CO3-based CO2 forming adsorbent by graphite-casting method
Na2CO3-based adsorbent pellets loaded on Al2O3 were prepared by graphite-casting method.The effects of calcination temperature on the decarburization characteristics and microstructure of Na2CO3/Al2O3 adsorbent pellets were investigated.High temperature calcination could significantly improve the decarburization performance of Na2CO3/Al2O3,and the CO2 adsorption capacities of Na10Al at 300℃ and 900℃ were 0.621mmol/g and 1.1mmol/g,respectively.The SEM and BET test results showed that the residual graphite on the surface of the pellets could be completely decomposed by calcination at 900℃,which eliminated the adverse effect of the hydrophobicity of graphite,and had a good pore structure and a dense Na2CO3 adsorption active site.The loading capacity of Na2CO3(10%—40%,mass fraction)was further optimized,and it was found that Na2CO3 was evenly distributed on the surface of Na2CO3/Al2O3 loaded with 20%,showing the best adsorption performance of 1.62mmol/g.Na2CO3/Al2O3 loaded with 10%Na2CO3 had the best pore structure(specific surface area of 83.417m2/g)and mechanical properties(compressive strength of 95.1MPa).Then ultrasonic cleaning replaced high-temperature calcination to remove graphite,and the structural characteristics of Na2CO3/Al2O3 loaded with 20%Na2CO3 were optimized.The adsorption capacity of Na2CO3/Al2O3 after ultrasonic cleaning was 1.715mmol/g,the specific surface area was 73.941m2/g and the compressive strength was 52.3MPa.The adsorbent pellets prepared by the optimized graphite-casting method had a potential application prospect.
Na2CO3/Al2O3adsorbentCO2 capturegraphite-casting methodultrasonic cleaningfixed bed
国家科技期刊平台
NSTL
万方数据
