Taming Pt 5d state occupancy via <scp>PtOMn</scp> electronic linkage for enhanced dehydrogenation activity
Yongxiao Tuo, Ying Meng, Qing Lu, Qīng Wáng, Furong Jia, Yan Zhou, Xiang Feng, Jun Zhang, Xuezhi Duan, De Chen
Abstract
Abstract The enhancement of catalytic activity is always limited by the dilemma in activation and desorption due to Sabatier principle. Locating the Sabatier optimum by manipulating catalyst electronic structure has been a long‐standing challenge in heterogeneous catalysis. Herein, we presented a generic strategy to continuously tailor the Pt 5d state occupancy via tuning the PtOMn electronic linkage over Al 2 O 3 ‐confined MnO x islands, aiming at accommodating the CH cleavage and product desorption capabilities in dehydrogenation of liquid organic hydrogen carriers (monocyclic/bicyclic hydrides). Rising Mn valence can decrease the Pt 5d state occupancy through more electron transfer from Pt 5d to O 2p due to the strong π‐donation of O 2p to Mn 3d. This will lead to the lower initial CH activation energy barrier while higher product desorption energy barrier. An intermediate Pt 5d filling of ~8.4 in PtMn 2 O 3 /Al 2 O 3 enables the balanced level of product desorption and CH activation, thus ensuring a superior dehydrogenation activity. The electron structure‐adsorption‐performance modulation mechanism described herein provides a benchmark to locate the Sabatier optimum for the metal catalyst design.