Morphology control of metal-organic frameworks by Co-competitive coordination strategy for low-temperature selective catalytic reduction of NO with NH3

Abstract

Morphology control of metal-organic frameworks (MOFs) has a great potential to achieve a superior performance for low-temperature selective catalytic reduction of NO with NH3 (NH3-SCR). In this work, we reported a co-competitive coordination strategy to control the morphology of HKUST-1 with high pore accessibility and stability in an acid environment. Our results show that varying the dose of inorganic and organic modulators can facilitate the transformation of morphology of HKUST-1 between octahedron, cube, and tetrakaidekahedron. The HKUST-1 in tetrakaidekahedron is enriched with weak Lewis acid sites that lead to an enhancement of the NH3-SCR catalytic efficiency by 93% at low temperatures between 200 and 240 ​°C. The catalytic kinetic study further reveals that the activation energy of modified HKUST-1 is the lowest among reported materials. This work could provide a promising alternative strategy to advance the low-temperature NH3-SCR catalysts via precise morphology control.