Obtaining highly stable <scp>T<sub>d</sub>‐Co</scp>(<scp>II</scp>) site by coupling hydrothermal method and <scp>CO<sub>2</sub></scp> introduction for propane dehydrogenation
Huihui Deng, Qin Sun, Wenchun Zheng, Baozhen Li, Zuoxi Zhuo, Xiaofang Wang, Ying Zhang, Li Tan, Yu Tang, Lizhi Wu
Abstract
Abstract The preparation of Co‐based catalysts with a single, highly dispersed active site is challenging and crucial for the high‐performance propane dehydrogenation (PDH) owing to harsh reaction conditions. Herein, the synergetic strategies including catalyst hydrothermal treatment and CO 2 introduction are adopted to realize the highly dispersed and stable T d ‐Co(II) site and applied for PDH. According to systematic characterizations and catalytic performance evaluation, the facial hydrothermal treatment improves the C 3 H 6 formation rate from 456 to 771 mmol C 3 H 6 g Co −1 h −1 and catalyst stability via the transformation of Co 3 O 4 species to the T d ‐Co(II) species. Meanwhile, the further introduction of CO 2 into the PDH system as a protective reagent for Co state would facilitate PDH with superior catalytic performance with TOF of 700 h −1 and C 3 H 6 formation rate of 970 mmol C 3 H 6 g Co −1 h −1 . It is revealed that the introduction of CO 2 maintains Co state with the T d ‐Co(II) species via inhabiting the generation of metallic Co spices.