Novel 2D Layered Manganese Silicate Nanosheets with Excellent Performance for Selective Catalytic Reduction of NO with Ammonia

Abstract Two‐dimensional (2D) catalysts are highly attractive for their great potential in environment remediation and energy conversion. In this work, a novel layered manganese silicate (MnSiO 3 ) catalyst was synthesized by hydrothermal method using silica in vermiculite, a layered silicate clay mineral, as the lattice‐matching matrix and silicon source. The epitaxial growth of MnSiO 3 is confined in the 2D directions, resulting in the morphology of vermiculite crystal thin nanosheets. The physichemical characterization results showed that MnSiO 3 possessed higher Mn 4+ content, acidic sites and reducing substances than that of MnO x /SiO 2 . The MnSiO 3 therefore exhibited 100 % NO conversion rate with 85 % N 2 selectivity at 150 °C in the NH 3 −SCR process. In situ DRIFTS studies show that MnSiO 3 has strong NO adsorption capacity and NH 3 activation capacity, which is beneficial to the improvement of NH 3 −SCR activity.