Zhang Man, Ban Hongyu, Wang Zhiqing, Xiang Xinning, Wang Xiaolei, Zhang Qian
School of Chemical Safety, North China Institute of Science and Technology, Langfang 065201, China.
The System Design Institute of Mechanical-Electrical Engineering, Beijing 100854, China.
Molecules. 2023 Sep 23;28(19):6779. doi: 10.3390/molecules28196779.
The catalytic gasification of petroleum coke with different ratios of KCO was investigated by a thermogravimetric analyzer (TGA) using the non-isothermal method. The initial, peak, and final gasification temperatures of the petroleum coke decreased greatly as the amount of KCO increased, and the catalytic reaction became saturated at a concentration of K higher than 5 mmol/g; with the further increase in catalyst; the gasification rate varied slightly, but no inhibition effect was observed. The vaporization of the catalyst was confirmed during the gasification at high temperatures. The structural evolution of the residual coke with different carbon conversions was examined by X-ray diffraction (XRD), Raman spectroscopy, and N adsorption analyses during gasification with and without the catalyst. The results showed that the carbon crystallite structure of the residual coke varied in the presence of the catalyst. As the carbon conversion increased, the structure of the residual coke without the catalyst became more ordered, and the number of aromatic rings decreased, while the graphitization degree of the residual coke in the presence of the catalyst decreased. Meanwhile, the surface area and pore volume of petroleum coke increased in the gasification process of the residual coke, irrespective of the presence of the catalyst. However, the reactivity of the residual coke did not change much with the variation in the carbon and pore structure during the reaction.
采用热重分析仪（TGA）的非等温方法研究了不同KCO比例下石油焦的催化气化。随着KCO用量的增加，石油焦的起始、峰值和最终气化温度大幅降低，且当K浓度高于5 mmol/g时催化反应达到饱和；随着催化剂用量的进一步增加，气化速率变化不大，但未观察到抑制作用。在高温气化过程中证实了催化剂的挥发。在有催化剂和无催化剂气化过程中，通过X射线衍射（XRD）、拉曼光谱和N吸附分析研究了不同碳转化率下残余焦炭的结构演变。结果表明，在催化剂存在下，残余焦炭的碳微晶结构发生了变化。随着碳转化率的增加，无催化剂时残余焦炭的结构变得更加有序，芳环数量减少，而有催化剂时残余焦炭的石墨化程度降低。同时，无论是否存在催化剂，在残余焦炭的气化过程中，石油焦的表面积和孔体积均增加。然而，反应过程中残余焦炭的反应性随碳和孔结构的变化没有太大改变。
