Abstract:

Decalin has multiple applications as both premium solvent and crucial ingredient in aviation fuel. The synthesis of decalin through deep hydrogenation of coking naphthalene has considerable industrial value. Acetylacetone platinum was used as precursor and deposited into the pores of HY zeolite through physical vapor deposition. A Pt-based catalyst with high dispersion was then obtained by rapidly pyrolyzing the organic ligands at high temperatures. The catalyst's structure and properties were characterized systematically by XRD, N₂ adsorption, CO-DRIFT, HRTEM, H₂-TPR, and XPS. The Pt particle size on the 0.5Pt/HY catalyst after rapid heat treatment, was small and uniform, unlike that by the traditional high-temperature calcination method. Under mild reaction conditions (H₂ 3MPa, 100℃, 1h), it exhibited high-efficiency in the deep hydrogenation of naphthalene, with the conversion of naphthalene and the yield of decalin both reaching 99.9%, and a TOF value of 2171h^-1. The experimental results indicate that the efficient production of decalin from naphthalene through deep hydrogenation is dependent on two factors: the high dispersion of platinum species in the catalyst and the presence of positively charged platinum species. The research results have certain guiding significance for the preparation of efficient Pt based catalysts for deep hydrogenation of naphthalene.

Key words: naphthalene, hydrogenation, zeolite, catalyst, rapid heat treatment, traditional calcination, particle size distribution

摘要：

十氢萘不仅可以作为高档溶剂，也是航空煤油的重要添加剂，通过焦化萘深度加氢合成十氢萘具有重要的工业价值。本文以乙酰丙酮铂作为前体物理气相沉积到HY沸石孔道中，通过高温快速热解有机配体获得了高分散的负载型Pt基催化剂。通过XRD、N₂吸附、CO-DRIFT、HRTEM、H₂-TPR和XPS等对催化剂的结构和性质进行了系统表征。与传统的高温煅烧不同，经快速热处理制备的Pt/HY催化剂中Pt粒径较小且分布均匀，在温和的反应条件（H₂ 3MPa、100℃、1h）下对萘具有优异的深度加氢性能，萘的转化率及十氢萘的产率均达到99.9%，且TOF值高达2171h^-1。实验结果表明，铂在催化剂上的高分散以及部分正价态铂物种的存在有助于萘深度加氢合成十氢萘。研究结果对于制备用于萘深度加氢的高效Pt基催化剂具有一定指导意义。

关键词: 萘, 加氢, 沸石, 催化剂, 快速热处理, 传统煅烧, 粒度分布