Abstract Aluminum phosphate (AlPO 4 ) bound HZSM-5 extrudates were prepared with different Al/P ratios, and characterized with respect to the species chemical state, surface morphology, pore structure, and acidity, in comparison to conventional alumina bound and as-received HZSM-5 zeolite catalyst. The binder results in decrease in micropore volume implying blockage of micro channels within the zeolite crystal. AlPO 4 binder forms dense amorphous matrix, while alumina forms a porous matrix with significant increase in mesopore volume and surface area. Moreover, both of the bound samples exhibit decreases in acidity strength and sites number, while the alumina bound one shows an increase in strong acidity strength which implies an enhancement of the acid stability of the strong acid sites. The reaction performance experiments on the simulated MTP operating conditions show that compared to alumina bound catalyst the AlPO 4 -bound type exhibits much lower paraffins and aromatics yields, and particularly that the polymer grade propylene may be easily obtained without C 3 splitter, though the lifetime assessment reveals that alumina is much superior to AlPO 4 as the binder.

中文翻译：

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用于甲醇制烯烃反应的粘合剂和高二氧化硅 HZSM-5 沸石之间的相互作用

摘要 磷酸铝 (AlPO 4 ) 结合的 HZSM-5 挤出物采用不同的 Al/P 比率制备，并在物种化学状态、表面形态、孔结构和酸度方面进行表征，与常规氧化铝结合和原样进行比较。 HZSM-5沸石催化剂。粘合剂导致微孔体积减小，这意味着沸石晶体内的微通道被堵塞。AlPO 4 粘合剂形成致密的无定形基体，而氧化铝形成多孔基体，介孔体积和表面积显着增加。此外，两种结合样品的酸度强度和位点数量均减少，而氧化铝结合的样品显示强酸强度增加，这意味着强酸位点的酸稳定性增强。