Durable Pdni/Al2o3 Catalyst with Pdo-Nio and Pdo-Nial2o4 Dual Interfaces for Methane Combustion

Catalytic oxidation is a valuable low-concentration methane removal method, and Pd-based catalysts are the most robust and widely applied system. Yet it suffers from poor stability in practical applications due to the sintering and water poisoning. In this work, we prepared a high-performance PdNi/Al2O3 catalyst with PdO-NiO and PdO-NiAl2O4 dual interfaces. Compared to bare Pd/Al2O3, PdNi/Al2O3 exhibited better low-temperature activity with T50 of 287 °C, rivaling the state-of-the-art Pd-based catalysts regarding turnover frequency (TOF). Besides, PdNi/Al2O3 also showed excellent hydrothermal stability at 750 °C, 10% H2O for 72h, with T50 remaining below 315 °C. Combining structural characterizations and DFT calculations, it was shown that dual interfaces promoted the activation of methane C-H bonds, suppressed the adsorption of surface water/hydroxyl groups and agglomeration of PdO particles. This study has provided new perceptions for exploring the influence of interfacial interactions and offered a route to synthesize high stability methane catalysts.

Keywords: methane combustion, stability, PdO-NiO interface, NiAl2O4 spinel phase

Suggested Citation: Suggested Citation

Xu, Hui and Liu, Zhang and Liu, Yanfei and Ma, Xiangyu and Wang, Chen and Shen, Meiqing and Du, Chun and Shan, Bin, Durable Pdni/Al2o3 Catalyst with Pdo-Nio and Pdo-Nial2o4 Dual Interfaces for Methane Combustion. Available at SSRN: https://ssrn.com/abstract=4089349 or http://dx.doi.org/10.2139/ssrn.4089349