Preparation and decarburization characteristics of SiO2-Al2O3 composite aerogel modified by potassium carbonate

In this paper, the preparation of potassium carbonate modified SiO2-Al2O3 composite aerogel, carbonation characteristics K2CO3 and decarburization regeneration cycle were studied. The influence loading rate on CO2 adsorption was studied by using a fixed bed reactor, microstructure samples analyzed combining SEM BET. results show that during alkali fusion sintering Na2CO3, Si-O-Si Si-O-Al bonds break, crystal structure is destroyed, covalent bond mullite transformed into ionic nepheline. Through orthogonal test, taking specific surface area aerogel as measurement index, optimal calcination conditions are determined follows: 900 ℃, reaction for 60 min, Na2CO3 addition ratio 0.5. more loaded, less corresponding active sites carrier. When 30%, maximum capacity 2.86 mmol·g–1. Excess will plug pore structure, destroy diffusion CO2, reduce utilization efficiency. percentage mesoporous volume decreased from 94.21% to 89.32%, indicating component mainly filled in mesoporous. After 10 tests, adsorbent 10.49%. stable performance excellent.