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

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 (MnSiO3) 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 MnSiO3 is confined in the 2D directions, resulting in the morphology of vermiculite crystal thin nanosheets. The physichemical characterization results showed that MnSiO3 possessed higher Mn4+ content, acidic sites and reducing substances than that of MnOx/SiO2. The MnSiO3 therefore exhibited 100 % NO conversion rate with 85 % N-2 selectivity at 150 degrees C in the NH3-SCR process. In situ DRIFTS studies show that MnSiO3 has strong NO adsorption capacity and NH3 activation capacity, which is beneficial to the improvement of NH3-SCR activity.