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Effect of A-site disubstituted of lanthanide perovskite on catalytic activity and reaction kinetics analysis of coal combustion

机译：钙钛矿型镧系元素A位双取代对煤燃烧催化活性和反应动力学分析的影响

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摘要

Perovskite catalysts are increasingly devoted to the field of coal combustion due to their special crystal structure and excellent catalytic effect. In this study, the lanthanide perovskite type catalyst La(0.8-x)Sr0.2KxMnO3 (x is the doping amount of K+) was prepared by sol-gel method, and the effect of K+ amount on the catalytic activity for coal combustion was investigated in detail. The catalyst was well characterized and the thermal dynamic parameters of coal catalytic combustion were calculated by the single reaction (SR) model and the distributed activation energy (DAE) model. The results show that the doping amount of K+ affects the specific surface area and particle size of the catalyst, due to the relatively large ionic radius of K+ and the effect of doping on the valence of other cations. The highest combustion reaction rate was achieved over La0.66Sr0.2K0.14MnO3, and it will change the specific surface area and particle size of the catalyst extremely. The dynamic calculation shows that there is a compensation relationship between the activation energy and the frequency factor. The DAE model can get the variation of activation energy in different reaction stages, and the final calculation results are in good agreement with the experimental results.
机译：钙钛矿催化剂由于其特殊的晶体结构和出色的催化作用而越来越多地致力于煤炭燃烧领域。本研究采用溶胶-凝胶法制备了镧系钙钛矿型催化剂La（0.8-x）Sr0.2KxMnO3（x为K +的掺杂量），并研究了K +量对煤燃烧催化活性的影响。详细。通过单反应（SR）模型和分布活化能（DAE）模型，对催化剂进行了很好的表征，并计算了煤催化燃烧的热力学参数。结果表明，由于K +的相对较大的离子半径以及掺杂对其他阳离子的化合价的影响，K +的掺杂量会影响催化剂的比表面积和粒径。在La0.66Sr0.2K0.14MnO3上达到了最高的燃烧反应速率，它将极大地改变催化剂的比表面积和粒径。动态计算表明，活化能与频率因子之间存在补偿关系。 DAE模型可以得到不同反应阶段活化能的变化，最终计算结果与实验结果吻合良好。

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