title: Low-temperature SCR of NOxby NH3over MnOx/SAPO-34 prepared by two different methods: a comparative study.
abstract: The low-temperature selective catalytic reduction (SCR) of NOxis a promising technology for removing NOxfrom flue gases. However, the vulnerability of Mn-based catalysts to SO2and H2O poisoning makes them unsuitable for industrial application. Herein, catalysts based on the MnOx/SAPO-34 catalysts were prepared by conventional impregnation and an improved molecularly designed dispersion method for use in the low-temperature SCR. The improved molecularly designed catalyst containing 20 wt% of MnOxexhibited high low-temperature NH3-SCR activity. Nearly 90% of the NOxwas converted exclusively to N2at 160°C using this catalyst. The structure and morphological analyses of the catalyst showed that the amorphous MnOxwas well dispersed on the surface of the support. The reasons for the high performance of the catalysts were ascertained using surface N2adsorption, XPS, H2-TPR and NH3-TPD. The results of these analyses indicated that high specific surface area and the redox capability, of the abundant Mn4+and Mn3+species, coupled with the surface chemisorbed oxygen and strong acid sites had a significant effect on the SCR reaction. In addition, the effects of SO2and H2O on activity of the catalysts were also investigated and it was found that the highly dispersed 20 wt% MnOx/SAPO-34 catalyst exhibited better SO2poisoning resistance than the other impregnated catalysts.
authors: a School of Environment and Energy , South China University of Technology, Guangzhou Higher Education Mega Centre , Guangzhou , People's Republic of China.
authors: Chenglong
authors: C
authors: Yu
authors: a School of Environment and Energy , South China University of Technology, Guangzhou Higher Education Mega Centre , Guangzhou , People's Republic of China.
authors: Lifu
authors: L
authors: Dong
authors: a School of Environment and Energy , South China University of Technology, Guangzhou Higher Education Mega Centre , Guangzhou , People's Republic of China.
authors: Feng
authors: F
authors: Chen
authors: a School of Environment and Energy , South China University of Technology, Guangzhou Higher Education Mega Centre , Guangzhou , People's Republic of China.
authors: Xiaoqing
authors: X
authors: Liu
authors: a School of Environment and Energy , South China University of Technology, Guangzhou Higher Education Mega Centre , Guangzhou , People's Republic of China.|b Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control , South China University of Technology, Guangzhou Higher Education Mega Centre , Guangzhou , People's Republic of China.
authors: Bichun
authors: B
authors: Huang
mesh_terms: D000327:Adsorption; D000641:Ammonia / Q000737:chemistry*; D002384:Catalysis; D003080:Cold Temperature; D005740:Gases; D006859:Hydrogen / Q000737:chemistry; D007477:Ions; D017895:Manganese Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D009569:Nitric Oxide / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction; D017641:Zeolites / Q000737:chemistry*
chemical_list: D005740:Gases; D007477:Ions; D017895:Manganese Compounds; D010087:Oxides; C000616260:SAPO-34; D014867:Water; D013458:Sulfur Dioxide; D017641:Zeolites; D009569:Nitric Oxide; C027424:manganese oxide; D000641:Ammonia; D006859:Hydrogen; D009584:Nitrogen
keywords: Highly dispersed; MnOx/SAPO-34 catalyst; NOx; low-temperature NH3-SCR; molecularly designed dispersion method