Preparation of graphitic carbon nitride g-C3N4-HMCM-22 composite catalysts and enhanced para-selectivity in m-xylene isomerization
Preparation of graphitic carbon nitride g-C3N4-HMCM-22 composite catalysts and enhanced para-selectivity in m-xylene isomerization
复制标题
石墨氮化碳g-C3N4-HMCM-22复合催化剂的制备及其增强间二甲苯异构化对位选择性
DOI：
10.1007/s11696-021-01982-4
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发表时间：
2022-01-28
期刊：
影响因子：
2.2
通讯作者：
Xue, Bing
中科院分区：
文献类型：
--
作者：
Liu, Zonghui;Zhang, Zhongze;Xue, Bing
A series of novel graphitic carbon nitride g-C3N4-HMCM-22 composite catalysts were successfully prepared. Their structure and acid properties were well characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), N-2 adsorption-desorption, Fourier transform infrared spectroscopy (TFIR), X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), and Py-FTIR. The prepared g-C3N4-HMCM-22 composite catalysts were then used for m-xylene (MX) isomerization. The effect of introduction of g-C3N4 on catalytic performance was studied. Compared with parent HMCM-22 catalyst, g-C3N4-HMCM-22 composite catalysts exhibited an improved p-xylene (PX) selectivity in MX isomerization. Moreover, G1H1 composite catalyst showed the highest PX selectivity than other as-prepared composite samples. Correlating the catalyst performance with its physical and chemical properties uncovers that increasing amounts of Lewis acid sites and effectively inhibiting the external Bronsted acid sites of HMCM-22 would be the key to improving the selectivity of PX.
