Hydroxy ‐ or chlorine‐anchored Pt single‐atom in Al2O3: Which is better for propane dehydrogenation?

AbstractPlatinum-based single-atom catalysts (Pt1 SACs) can significantly improve the catalytic activity for propane dehydrogenation (PDH) because of their elevated atomic utilization. However, maintaining the high-temperature stability of the Pt1 species is of utmost importance. To answer the key question: Hydroxy- or chlorine-anchored Pt1 single atoms in Al2O3: Which is the better choice for PDH? We have designed two types of single-atom Pt catalysts on Al2O3 via a surface group trapping strategy: Pt1–Al2O3 with isolated Pt –O species and Pt1Cl1–Al2O3 with isolated Pt –Cl species. When tested in PDH, Pt1Cl1–Al2O3 showed an exceptional activity of 145 molpropene molPt−1 min−1 at 600 °C, which was 3.8 times higher than that of Pt1–Al2O3. It has been demonstrated that the isolated Pt –Cl species in Pt1Cl1–Al2O3 act as an active site and undergoes a dehydrogenation pathway with a lower energy barrier, while Pt1 in Pt1–Al2O3 undergoes a dissociation-desorption pathway, resulting in few propene productions.

Source: AIChE Journal - November 9, 2023 Category: Science Authors: Yanpeng Yang, Qiang Liu, Jingnan Wang, Panpan Li, Chenglin Miao, Jianliang Liu, Yijun Yang, Jieguang Wang, Xi Wang Tags: RESEARCH ARTICLE Source Type: research