Abstract
The combustible gas produced by coal pyrolysis can be used as a clean fuel to reduce environmental pollution caused by coal combustion. In order to improve the efficiency of coal pyrolysis to prepare flammable gases, Ni-Co supported pyrolysis catalysts were prepared by equal volume impregnation method using the pyrolysis coke of different pyrolysis final temperatures as the carrier in this study. The effects of different pyrolysis final temperatures and different metal loadings on pyrolysis products were studied. The cracking mechanism of the catalysts was characterized by BET, XRD, XPS and SEM. The results show that: (1) the catalytic efficiency of pyrolysis coke catalyst is mainly related to the metal type and loading of the additive. (2) The optimum preparation conditions for the supported catalyst are: use pyrolysis coke with 750 °C final pyrolysis temperature as the carrier, the loading amount of Ni is 5%, and the loading amount of Co is 8%.
Highlights
Coal energy has made an indispensable contribution to the development of human society; we have paid a heavy price for this at the same time
Coal gasification refers to the process of carbon oxide, hydrogen and methane produced from coal or semi-coke with catalyst by heterogeneous reaction, it is mainly the interaction between carbon in a solid fuel with oxygen, water vapor, carbon dioxide, and hydrogen in the gas phase
It can be known that the gas yield of tar cracking is the highest when the pyrolysis coke catalyst prepared at the final pyrolysis temperature of 750 °C, so the pyrolysis coke catalyst with the final temperature of 750 °C is selected for subsequent experiments
Summary
Coal energy has made an indispensable contribution to the development of human society; we have paid a heavy price for this at the same time. A part of the side chains with stronger chemical bond starts to cleave when the temperature rises to a certain value, which leads the concentration of free radicals increasing In this process, the small molecular compound and radicals enter the gas phase from the coal plastid by diffusion, and a secondary reaction occurs while moving in the diffusion process, combined with each other to form heavy tar and semi-coke due to the polycondensation[3,4,5,6]. Coal gasification refers to the process of carbon oxide, hydrogen and methane produced from coal or semi-coke with catalyst by heterogeneous reaction, it is mainly the interaction between carbon in a solid fuel with oxygen, water vapor, carbon dioxide, and hydrogen in the gas phase.
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