低碳化学与化工2025，Vol.50Issue(1)：101-110,10.DOI:10.12434/j.issn.2097-2547.20240170
废粘土砖合成A型分子筛和A/X共晶分子筛及其CO2吸附性能
Synthesis of type A zeolite and A/X eutectic zeolite from waste clay brick and their CO2 adsorption performances
摘要
Abstract
The utilization of solid waste resources is of important significance.Waste clay brick was used as the raw material to synthesize high CO2 adsorption performance type A zeolite and A/X eutectic zeolite through the hydrothermal method.The effects of alkali to ash ratio(mass ratio),calcination temperature,crystallization temperature and crystallization time on the synthesis of zeolite from waste clay brick were investigated.The synthesized zeolites were characterized using XRD,XRF,SEM,N2 adsorption/desorption and FTIR.The results show that,with a fixed Si to Al ratio(mole ratio)of 1,the optimal morphology of type A zeolite and A/X eutectic zeolite is obtained under the conditions of an alkali to ash ratio of 0.6 and 1.6,respectively,calcination temperature of 750 ℃,crystallization temperature of 90 ℃ and crystallization time of 24 h.Testing reveals that their specific surface areas are 61.3 m2/g and 326.7 m2/g,and their CO2 adsorption capacities are 2.96 mmol/g and 3.22 mmol/g at 30 ℃ under a CO2 atmosphere(CO2 volume fraction of 10％),respectively.After five regeneration cycles,their adsorption capacities remain above 88％of the initial adsorption capacity.The CO2 adsorption mechanism of the two zeolites was studied through adsorption kinetics and rate-limiting diffusion models.It is found that CO2 molecules are adsorbed on the zeolites due to internal/external pore diffusion and intermolecular Coulomb forces,mainly through physical adsorption.This study can provide a reference for the synthesis and application of zeolites from waste clay brick.关键词
废粘土砖/A型分子筛/A/X共晶分子筛/CO2吸附Key words
waste clay brick/type A zeolite/A/X eutectic zeolite/CO2 adsorption分类
化学化工引用本文复制引用
陈云,龚海淳,许培峰,马永清,王君雅,张玉..废粘土砖合成A型分子筛和A/X共晶分子筛及其CO2吸附性能[J].低碳化学与化工,2025,50(1):101-110,10.基金项目
云南省重点研发计划(202303AC100008) （202303AC100008）
云南省应用基础研究计划(202101AT070107). （202101AT070107）
