Catalytic activities of Zn-promoted Hβ zeolite for gas-phase aza-heterocyclic-aromatization of acrolein dimethyl acetal and aniline to quinolines were investigated. the Zn/Hβ catalyst showed better selectivity to quinoline than the parent Hβ one. Characterization results demonstrated that the Zn/Hβ catalyst prepared via deposition precipitation method existed the isolated Zn²⁺ cations as well as the highly dispersed ZnO clusters, which not only decreased concentration of strong acid sites but also enhanced enhance aromatization process. As a result, the decrease of strong acid sites restrained the cracking of acrolein to acetaldehyde as well as the alkylation of quinoline to ethylquinoline effectively; and the Zn species of catalyst further improved aromatization process of dihydroquinoline to quinoline. Moreover, the Zn/Hβ catalyst presented relatively enhanced ability of anti-activation and excellent regenerability, owing to decrease strong acid-induced polymerization of active intermediates to form the coking. Under the optimized operating conditions, more than 51 % yield of quinoline was achieved over Zn/Hβ catalyst; which far exceeded quinoline yield (28 %) over the pure Hβ one. Besides, a plausible reaction routes in vapor-phase acrolein diethyl acetal with aniline to quinolines were suggested in this paper.

研究了锌促进的Hβ分子筛对丙烯醛二甲基缩醛和苯胺气相氮杂-杂环-芳构化的催化活性。Zn /Hβ催化剂对喹啉的选择性优于母体Hβ。表征结果表明，沉积沉淀法制备的Zn /Hβ催化剂存在分离出的Zn ²⁺阳离子以及高度分散的ZnO簇，这不仅降低了强酸位点的浓度，而且增强了芳构化过程。结果，强酸位点的减少抑制了丙烯醛裂解为乙醛以及喹啉烷基化为乙基喹啉。催化剂中的Zn种类进一步改善了二氢喹啉向喹啉的芳构化过程。此外，由于减少了强酸诱导的活性中间体聚合形成焦化，因此Zn /Hβ催化剂具有相对增强的抗活化能力和出色的再生性。在最佳操作条件下，在Zn /Hβ催化剂上，喹啉的收率超过51％。与纯Hβ相比，它远远超过了喹啉的收率（28％）。除了，