载氧体化学链催化氧化净化室内空气污染

Chemical looping catalytic oxidation purification of indoor air pollutants using oxygen carrier

为实现新装修室内空气污染的高效净化,研究以联合溶胶凝胶-共浸渍法,制备多孔复合NiO-CeO_(2)-Fe_(2)O_(3)载氧体,在固定床反应器中对微量甲醛、甲苯和苯污染物进行了单独和同时化学链催化氧化净化研究。结果表明:载氧体均能将3种污染物催化氧化净化,床层穿透前的净化尾气污染物含量均能达到0。3种污染物净化的难易程度为苯、甲苯和甲醛,同时净化的穿透时间均很短,表明了载氧体催化氧化净化这3种微量空气污染物的弱选择性。12环反应和再生研究表明,载氧体具有较好的化学链氧传递和氧化还原反应性。未反应核收缩模型能较好地描述载氧体催化氧化净化过程,主要速率控制步骤为表面化学反应控制。

In order to realize efficient purification of newly decorated indoor air pollutants,the porous composite NiO-CeO_(2)-Fe_(2)O_(3)oxygen carrier was prepared by sol-gel combined with co-impregnation methods.The performance of the catalyst for single and simultaneous oxidation purification of trace formaldehyde,toluene and benzene pollutants was studied in a fixed bed reactor.The results show that the oxygen carrier can purify three pollutants by chemical looping catalytic oxidation method,and the pollutants contents of the purified tail gas can reach zero in pre-breakthrough stage.The purification difficulty of the three pollutants is put in order of benzene,toluene and formaldehyde.The breakthrough time of simultaneous purification is very short.The studies on the reaction and regeneration of 12 cycles illustrate that the oxygen carrier has good stability of chemical looping oxygen transfer and redox reactions.The results reaction kinetics show that the unreacted nuclear shrinkage model can describe the catalytic oxidation purification process of oxygen carrier catalyst.The main rate control step is the surface chemical reaction control.