Guo Qinghua, Huang Yuchen, He Qing, Gong Yan, Yu Guangsuo
Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, P. R. China.
State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, Ningxia, P. R. China.
ACS Omega. 2021 Jan 6;6(2):1584-1592. doi: 10.1021/acsomega.0c05425. eCollection 2021 Jan 19.
In this work, the effect of an iron-based catalyst from coal liquefaction on coal gasification was studied. Two catalyst loading methods and three catalyst loading contents were taken into consideration. Besides, the carbon structure, surface morphology, and element distribution of coal char and gasified semi-char were investigated, and the interactions between the catalyst and internal minerals of coal were studied. The results showed that the coal char prepared by wet impregnation had higher reactivity than that prepared by a dry mixing method. From the perspective of improving the coal reactivity, the optimal addition method should be wet impregnation with a 2% catalyst. The model-free and model-fitting methods were applied to study the catalytic gasification kinetics. The iron-based catalyst would be broken during wet impregnation, and the catalyst fragments could stick to the surface of coal char, resulting in higher reactivity. The graphitization of char increased with the addition of the iron-based catalyst. This can imply that the carbon structure cannot effectively represent the gasification reactivity in the presence of the iron-based catalyst. The Iron-based catalyst can accelerate the gasification rate alone and can also provide higher catalytic activity with the internal minerals of coal.
本工作研究了煤液化铁基催化剂对煤气化的影响。考虑了两种催化剂负载方式和三种催化剂负载量。此外，还研究了煤焦和气化半焦的碳结构、表面形貌及元素分布，并研究了催化剂与煤内部矿物质之间的相互作用。结果表明，湿浸渍法制备的煤焦比干混法制备的煤焦具有更高的反应活性。从提高煤反应活性的角度来看，最佳添加方式应为2%催化剂的湿浸渍法。采用无模型和模型拟合方法研究了催化气化动力学。铁基催化剂在湿浸渍过程中会破碎，催化剂碎片会附着在煤焦表面，从而导致更高的反应活性。随着铁基催化剂的添加，焦炭的石墨化程度增加。这意味着在铁基催化剂存在下，碳结构不能有效地代表气化反应活性。铁基催化剂可单独加速气化速率，也可与煤内部矿物质一起提供更高的催化活性。
