摘要
实验采用共沉淀法以Ca(Ac)2.H2O作为CaO前驱体,经NH3.H2O沉淀、静置、醇洗、烘干制备锆改性钙基高温二氧化碳吸收剂,并考察锆添加量、反应温度及时间、CO2分压等因素对其吸收性能的影响。经锆改性后,吸收剂中掺杂ZrO2形成了良好的介孔结构,可维持较高的碳酸化转化率,提高吸收剂的循环热稳定性。测试结果表明,当Zr/Ca=1:40,CO2分压为30%,碳酸化温度为650℃,反应时间30 min,再生温度为800℃,再生时间30 min反应条件下,最大吸收转化率达到82.6%,且吸收剂在10次循环吸收反应后仍保持较高的碳酸化转化率73.6%,不产生团聚现象,呈现良好的分散性。实验制备的吸收剂在高温下具备了良好的吸收性能和循环再生稳定性,对CO2的吸收具有较大的潜力,为强化甲烷水蒸气重整制氢工艺的可行性研究提供了基础。
Zirconium modified calcium oxide for high temperature CO2 absorption was prepared by co-precipitation method with Ca（Ac）2·H2O as calcium precursor,following steps of precipitation with NH3.H2O,alcohol washing,drying and calcination.Influences of sorbent preparation conditions on the sorbent structure and absorption performance were investigated with absorption activity evaluation,XRD,SEM and TG.Experiments showed that the doping of Zr in the sorbent was benefit in maintaining the mesoporous structure of CaO,leading a high conversion rate of carbonation and enhancing the thermal stability of the sorbent.Under the experimental conditions of Zr/Ca of 1/40,CO2 partial pressure 30%,carbonation temperature of 650℃,reaction time 30min and regeneration at 800℃ for 30min,the maximum conversion rate of sorption reached 82.6%,and remained 73.6% after 10 cycles,and no severe sintering was observed.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2011年第2期85-90,共6页
Environmental Science & Technology
关键词
二氧化锆
改性
钙基吸收剂
二氧化碳
zirconia
modified
calcium-based sorbent
carbon dioxide
作者简介
黄绍兰（1984-），女，硕士研究生，研究方向为大气污染控制，（手机）13269381350（电子信箱）shaolan2010@163．com；
通讯作者，（手机）13910534504（电子信箱）tonghua@mail．buct.edu．cn。
