Excellent porous environmental nanocatalyst: Tactically integrating size-confined highly-active MnOx in nanospace of mesopore enables promotive catalytic degradation efficiency of organic contaminants
Confinement of refined catalytic active substances in the special nanospace is beneficial to promoting reaction process taking advantage of quantum confinement effect and enlarged atomic efficiency. We present redox nanoporous molecular sieve nanocatalyst containing size-confined active MnOx in siliceous nanospace of mesopore through a functional micelle-assisted in-situ embedding trick, and demonstrate its excellent environmental catalytic efficiency toward oxidative degrading of methyl orange in liquid phase(8 min) and volatile toluene in gas(T90/T100=225/240 °C, under 60,000 mL/g•h mass space velocity with the 1000 ppm concentration, surpassing noble metal and most composite catalyst), by virtue of eliminated diffusion limitation and great active atom-efficiency. This synthetic strategy well-made the resultant MnOx afford refined size and greater interacted occasion with those diffusing reactant molecules without impeding their diffusion and mass transfer. The excellent and durable catalytic efficiency by right of the present superior characteristics concerning great-dispersion of MnOx and favorable structure were demonstrated, thereby confirming high catalytic removal efficiency depends on the amount of accessible MnOx rather than loading of active species. Our findings give the first example for the heterogeneous environmental catalyst both affording highly-efficient catalytic elimination of organic contaminants in liquid and gaseous systems.