In situ visualizing reveals potential drive of lattice expansion on defective support toward efficient removal of nitrogen oxides
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2024-06-03 |
| Journal | Proceedings of the National Academy of Sciences |
| Authors | Zhifei Hao, Guoquan Liu, Pengfei Wang, Weiyu Zhang, Wenming Sun |
| Institutions | Peking University, Nankai University |
| Citations | 7 |
Abstract
Section titled āAbstractāAs a sustainable and promising approach of removing of nitrogen oxides (NO x ), catalytic reduction of NO x with H 2 is highly desirable with a precise understanding to the structure-activity relationship of supported catalysts. In particular, the dynamic evolution of support at microscopic scale may play a critical role in heterogeneous catalysis, however, identifying the in situ structural change of support under working condition with atomic precision and revealing its role in catalysis is still a grand challenge. Herein, we visually capture the surface lattice expansion of WO 3āx support in Pt-WO 3āx catalyst induced by NO in the exemplified reduction of NO with H 2 using in situ transmission electron microscopy and first reveal its important role in enhancing catalysis. We find that NO can adsorb on the oxygen vacancy sites of WO 3āx and favorably induce the reversible stretching of W-O-W bonds during the reaction, which can reduce the adsorption energy of NO on Pt 4 centers and the energy barrier of the rate-determining step. The comprehensive studies reveal that lattice expansion of WO 3āx support can tune the catalytic performance of Pt-WO 3āx catalyst, leading to 20% catalytic activity enhancement for the exemplified reduction of NO with H 2 . This work reveals that the lattice expansion of defective support can tune and optimize the catalytic performance at the atomic scale.