Synthesis of highly dispersed Pt/HY catalyst by rapid pyrolysis of platinum precursors and its performance for deep naphthalene hydrogenation

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. © 2023 Chemical Industry Press. All rights reserved.