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采用热重分析法研究了铁含量对焦炭反应的影响规律。利用液相吸附法制备了不同Fe2O3含量的焦炭样品,通过对样品的微观分析和焦炭反应动力学的研究,阐释了铁元素对反应机理的影响。结果表明,铁对焦炭溶损反应具有正催化作用,且催化作用随铁含量的增大而加强;铁的存在降低了焦炭反应的起始反应温度和剧烈反应温度,导致焦炭过早破碎,影响焦炭强度;同时铁的存在也降低了焦炭溶损反应的反应级数和活化能。反应级数从无Fe2O3添加时的1.53级降为零级。研究表明,Fe2O3均匀分布在焦炭表面使其能提供更多的有效催化活性中心,进而对溶损反应起到催化作用。
The influence of iron content on coke reaction was studied by thermogravimetric analysis. Coke samples with different content of Fe2O3 were prepared by liquid-phase adsorption method. The effects of iron on the reaction mechanism were elucidated through the microscopic analysis of the sample and the kinetics of coke reaction. The results showed that iron had a positive catalytic effect on the loss reaction of coke, and the catalytic effect was enhanced with the increase of iron content. The presence of iron reduced the initial reaction temperature and severe reaction temperature of coke reaction, resulting in premature crushing of coke Coke strength; the presence of iron also reduces the reaction order and activation energy of the coke dissolution reaction. The reaction order was reduced from 1.53 without Fe2O3 to zero. The results show that the uniform distribution of Fe2O3 on the surface of coke makes it possible to provide more active sites for catalytic activity, which can catalyze the reaction.