Thermal stable Pt clusters anchored by K/TiO2-Al2O3 for efficient cycloalkane dehydrogenation

Catalytic dehydrogenation of cycloalkanes is considered a valuable endothermic process for alleviating the thermal barrier issue of hypersonic vehicles. However, conventional Pt-based catalysts often face the severe problem of metal sintering under high-temperature conditions. Herein, we develop an efficient K2CO3-modified Pt/TiO2-Al2O3 (K-Pt/TA) for cycloalkane dehydrogenation. The optimized K-Pt/TA showed a high specific activity above 27.9 mol center dot mol-1 center dot s-1(H2/Pt), with toluene selectivity above 90.0% at 600 degrees C with a high weight hourly space velocity of 266.4 h-1. The introduction of alkali metal ions could generate titanate layers after high-temperature hydrogen reduction treatment, which promotes the generation of oxygen vacancy defects to anchored Pt clusters. In addition, the titanate layers could weaken the surface acidity of catalysts and inhibit side reactions, including pyrolysis, polymerization, and isomerization reactions. Thus, this work provides a modification method to develop efficient and stable dehydrogenation catalysts under high-temperature conditions. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.