Dry gel conversion synthesis of Cu/SSZ-13 as a catalyst with high performance for NH3-SCR

Abstract

Abstract Selective catalytic reduction (SCR) of NOx with zeolite catalysts has been reported as the most promising technique for the removal of NOx from diesel engine exhaust. In this research, SSZ-13 zeolite doped with Cu species was synthesized by dry gel conversion (DGC) method and applied as a catalyst for NH3-SCR. The obtained Cu/SSZ-13 was characterized using X-ray diffraction (XRD), energy-dispersive X-ray (EDX), Scanning Electron Microscopy (SEM), NMR spectroscopy, ESR spectroscopy, nitrogen adsorption. Cu/SSZ-13 synthesized by DGC method has higher crystallinity and porosity than that synthesized by conventional hydrothermal synthesis (HTS) method. Due to its higher crystallinity and porosity, higher amount of Cu ions was introduced into SSZ-13 synthesized by DGC method, leading to a higher catalytic performance for the SCR of NOx compared with Cu/SSZ-13 prepared by HTS. In addition, Cu/SSZ-13 synthesized by DGC method showed higher hydrothermal stability.