Abstract: This work systematically investigates the influence of pressurized water-vapor treatment on the acidic properties and pore structure of HY zeolite, as well as its catalytic performance in the alkylation of naphthalene with 1-dodecene. Advanced analytical techniques, including SEM, NH₃-TPD,and Py-IR, are used to characterize the acid properties and pore structure of the catalysts. The results indicate that the mesopore volume of the zeolite catalyst treated with pressurized steam at 0.2 MPa is 0.120 cm³/g, with an average mesopore diameter exceeding 30 nm. The diffusion performance of reactant and product molecules within the zeolite is improved. The accessibility index of strong acid sites rises from 0.11 (for the untreated catalyst)to 0.32, while the acid-pore synergy index increases from 16.53 to 32.28, evidencing a synergistic optimization of acid properties and pore structure. The catalytic performance evaluation reveals that the conversion rate of 1-dodecene and the selectivity for long-chain alkylnaphthalenes on the zeolite catalyst treated with pressurized steam at 0.2 MPa reach 98.57% and 95.07%, respectively. This is primarily attributed to thelarger mesopore volume and higher accessibility of strong acid sites of the catalyst achieved through coupled regulation.

Key words: HY zeolite, coupling regulation, pressurized steam treatment, long-chain alkylnaphthalene synthesis, pore structure