Tailor the crystal planes of MIL-101(Fe) derivatives to enhance the activity of SCR reaction at medium and low temperature

Mainly exposed crystal facets and controllable morphology play a key role in the final performance of the preparation of specific nanomaterials . In the present study, a metal–organic framework pyrolysis method without adding solvent modifiers was developed. By adding CO in the calcination atmosphere to change atmosphere ratio, Fe 3 O 4 nanostructures are exposed with different crystal planes and evaluated their performance in NH 3 -SCR reaction. This study proves that SCR catalytic activity of Fe 3 O 4 nanocrystals is dependent on morphology and crystal facet. Compared with materials exposed (1   0   0), catalysts with more (1   1   1) show stronger deNO x performance. The preferential exposure of Fe 3 O 4 (1   1   1) crystal facets increases the concentration of adsorbed oxygen on the catalyst, showing higher surface acidity , and enhances the interaction among NO, O 2 and catalyst, which is conducive to SCR reaction. This is supported by DFT calculations . The results present a great application prospect in preparing nanomaterials with specific crystal structures to effectively treat pollutants.