期刊
FUEL
卷 338, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.127260
关键词
Coaromatization; BTX yield; Acid distribution; Active center; Aromatics precursors
A series of [Zn,Ga]/HZ catalysts with modified acid distribution were prepared and studied for their catalytic performance in the coaromatization reaction of n-hexane and methanol. The introduction of Ga greatly increased the content of active centers Zn(OH)+, leading to improved dehydroaromatization ability and higher aromatics yield.
A series of [Zn,Ga]/HZ catalysts were prepared by impregnation and their catalytic performance in coaroma-tization of n-hexane and methanol, a heat-coupling reaction, were studied in detail. The crystallization, textural properties, morphology, acidity, composition and chemical state were characterized by XRD, N2 adsorption/ desorption isotherms, TEM, py-FTIR, ICP-OES and XPS. The modification of Zn and Ga tunes the acid distri-bution, and more importantly Ga introduction greatly increases the content of active centers Zn(OH)+ from 30 % (1Zn/HZ) to 60 %. As a result, [Zn,Ga]/HZ improves the dehydroaromatization ability and provides higher aromatics yield. The analysis of organic species in catalyst by TG and GC-MS confirms that [Zn,Ga]/HZ produces more aromatics precursors than HZ. Under the conditions of feed ratio (n-hexane/methanol) 3:7, reaction temperature 530 degrees C, and WHSV 1.0 h-1, the BTX yield was significantly increased to 70 %.
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