摘要
在工业生产过程中,CO_(2)的大量排放导致温室效应和环境污染等问题,已成为人们关注的热点。因氧化钙在捕获CO_(2)过程中吸附容量高且成本低廉,从而受到了广泛关注。但在高温条件下,氧化钙易形成大颗粒,导致其吸收容量降低,因此限制了其在CO_(2)捕获方面的应用。金属氧化物的加入可以使钙基吸附剂表现出更加优越的热稳定性,进而增强CO_(2)捕集特性。掺杂惰性氧化物SiO_(2)可增大吸附剂的孔隙度,形成支撑骨架来增强二氧化碳吸附性。惰性金属MgO在钙基吸附剂中可形成支撑骨架,但实际吸附容量较低、热稳定性较差以及吸附动力学特性较慢,使其在CO_(2)捕集领域的实际应用程度受到一定制约。在钙基吸附剂中掺杂适量的Al2O3可提高吸附剂在高温煅烧循环中的稳定性,但掺杂过量Al2O3则会降低吸附容量。金属氧化物ZrO_(2)掺杂钙基吸附剂表现出优异的吸附性能,经常掺杂在钙基吸附剂中在高温循环煅烧中使用,具有较高稳定性。金属氧化物NiO具有低廉的成本、丰富的储备量和高温稳定性等特点。不同的金属氧化物掺杂钙基吸附剂具有不同的原理,各自具有优势,应选择合适的金属氧化物进行掺杂改性,获得最大程度的捕获容量。
The greenhouse effect and environmental pollution caused by the large amount of CO_(2) emitted from industrial production has become a hot topic of concemn.Calcium oxide has been widely concerned due to its high adsorption capacity and low cost during CO_(2)capture.However,calcium oxide is easy to form large particles under high temperature conditions,resulting in a decrease in its absorption capacity,thus limiting its application in CO_(2)capture.The addition of metal oxides can make calcium-based adsorbent exhibit better thermal stability,thus enhancingthe CO_(2) capture characteristics.The doping of inert oxide SiO_(2) can increase the porosity of adsorbent and form a supporting skeleton to enhance CO_(2)adsorption.Inert metal MgO can form a supporting skeleton in calcium-based adsorbent,but its practical application in the field of CO_(2) capture is limited due to its low adsorption capacity,poor thermal stability and slow adsorption kinetics.Doping an appropriate amount of Al_(2)O_(3)in calcium-based adsorbent can improve the stability of adsorbent in high-temperature calcination cycle,but doping too much Al_(2)O_(3)may reduce the adsorption capacity.Metal oxide ZrO_(2) doped calcium-based adsorbent shows excellent adsorption properties,and ZrO_(2) is often doped in calcium-based adsorbent for use in high-temperaturecyclic calcinationwith high stability.Metaloxide NiO has the characteristics of low cost,abundant reserves and high temperature stability.Different metal oxide doped calcium-based adsorbents have different principles,and each has its own advantages.Suitable metal oxides should be selected for doping modification to obtain maximum capture capacity.
作者
丁巍巍
刘瑞
吴爽
Ding Weiwei;Liu Rui;Wu Shuang(College of Marine Science and Environment,Dalian Ocean University,Dalian Liaoning 116023)
出处
《中外能源》
CAS
2024年第7期87-95,共9页
Sino-Global Energy
关键词
二氧化碳吸附
钙基吸附剂
金属氧化物
掺杂
carbon dioxide adsorption
calcium-based adsorbent
metal oxide
doping
