Abstract：Al2O3 is one of the most important catalyst supports, and its pore structure significantly affects the catalytic performance. In order to control the pore structure of alumina, pseudo-boehmite, an alumina precursor, was synthesized through the hydrolysis of aluminum isopropoxide. Structure modifiers including tetrapropylammonium hydroxide, polyethylene glycol-600, and N,N-dimethylformamide were used to induce the formation of blocky, flaky, and rod-shaped pseudo-boehmite, respectively. Then, a spherical alumina carrier was produced via oil-drop method, and a Pt-Sn/θ-Al2O3 catalyst was prepared by metal impregnation for propane dehydrogenation reactions. It was discovered that the utilization of N,N-dimethylformamide as an additive facilitates the creation of rod-shaped pseudo-boehmite with superior pore stability. This structure remained relatively loose after peptization and calcination at 1 000 ℃, resulting in a θ-Al2O3 carrier with a pore volume reaching up to 0.73 cm3/g. The Pt-Sn/θ-Al2O3 catalyst prepared with this carrier demonstrated outstanding activity in propane dehydrogenation reaction, achieving an initial propane conversion exceeding 43.4%, and maintaining a conversion above 37.9% after 16 h of reaction. The selectivity for propylene consistently remained above 86.0%.
XU Jingdong,YE Hongping,ZHU Haibo et al. Preparation of Rod-Shaped Alumina with High Pore Volume for Propane Dehydrogenation[J]. Chemical Reaction Engineering and Technology, 2025, 41(5): 550-557.
