CAJ | 학술논문

采用共沉淀法制备不同物质的量比Mn掺杂的铁基载氧体( Mn-Fe2 O3),并进行XRD、BET和TEM表征。开展不同温度下Mn-Fe2 O3与CO的化学链燃烧实验,研究载氧体的反应特性,确定较优的掺杂量和反应温度。结果表明,适量的Mn掺杂有助于改善铁基载氧体的反应活性,Fe：Mn物质的量为50：1时燃烧反应转化率最高。多循环化学链燃烧实验证实了载氧体稳定性较好。不同升温速率(30、40、50℃/min)下反应动力学分析表明,Mn-Fe2 O3与CO的化学链燃烧还原反应均属于随机成核和随后生长的Avrami-Erofeev方程模型,并依据模型分别计算出了该模型的活化能和频率因子。
채용공침정법제비불동물질적량비Mn참잡적철기재양체( Mn-Fe2 O3),병진행XRD、BET화TEM표정。개전불동온도하Mn-Fe2 O3여CO적화학련연소실험,연구재양체적반응특성,학정교우적참잡량화반응온도。결과표명,괄량적Mn참잡유조우개선철기재양체적반응활성,Fe：Mn물질적량위50：1시연소반응전화솔최고。다순배화학련연소실험증실료재양체은정성교호。불동승온속솔(30、40、50℃/min)하반응동역학분석표명,Mn-Fe2 O3여CO적화학련연소환원반응균속우수궤성핵화수후생장적Avrami-Erofeev방정모형,병의거모형분별계산출료해모형적활화능화빈솔인자。
Mn-doped Fe2 O3 oxygen carriers with different molar ratios of Fe to Mn were prepared by co-precipitation method, which were characterized by XRD, BET and TEM. Chemical looping combustion tests between Mn-Fe2 O3 and CO at different temperatures were performed to investigate the reaction characteristics, and to determine the optimized Mn doping amount and reaction temperature. The results reveal that a rational Mn doping could enhance the reactivity of iron-base oxygen carrier, and the optimal Fe/Mn molar ratio is 50. Multi-cycle experiments confirm the high stability of the optimized oxygen carrier. Furthermore, the reaction kinetic analysis at heating rates of 30, 40, 50℃/min shows that the Avrami-Erofeev model is suitable for the reactions, and the activation energy and pre-exponential factor can be calculated according to the kinetic model.