By a News Reporter-Staff News Editor at Science Letter -- Research findings on Molecular Catalysis are discussed in a new report. According to news reporting out of Guangdong, People's Republic of China, by NewsRx editors, research stated, "The effect of H2O and SO2 on the catalytic activity of manganese oxides supported on multi-walled carbon nanotubes (MnOx/MWCNTs) for low-temperature selective catalytic reduction (SCR) of NOx with NH3 was studied. Also, N-2 adsorption, transient response experiments, X-ray powder diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and in situ FT-IR spectroscopy were performed to investigate the deactivation mechanism of MnOx/MWCNTs catalyst in the presence of H2O or SO2."
Our news journalists obtained a quote from the research from the South China University of Technology, "Experimental results showed that H2O had a reversible negative effect on the catalytic activity of the catalyst. When the temperature was higher than 270 degrees C, the effect of H2O could be negligible. The competitive adsorption of H2O and NH3 on the Lewis acid sites contributed to the deactivation of the catalyst. The integrity increase of MWCNTs in the presence of H2O might be another reason for the deactivation of the catalyst. However, SO2 led to the irreversible deactivation of the catalyst. The higher the reaction temperature, the more dramatically the catalystic activity decreased. The sulfation of the active center atoms was the main poisoning route."
According to the news editors, the research concluded: "Also, formation of ammonium sulfates on the catalyst surface and the competitive adsorption between SO2 and NO were responsible for the partial deactivation of the catalyst to some extent."
For more information on this research see: H2O and SO2 deactivation mechanism of MnOx/MWCNTs for low-temperature SCR of NOx with NH3. Journal of Molecular Catalysis A-Chemical, 2013;377():154-161. Journal of Molecular Catalysis A-Chemical can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands (see also Molecular Catalysis).
Our news journalists report that additional information may be obtained by contacting S.W. Pan, S China Univ Technol, Guangdong Prov Key Lab Atmospher Environm & Pollu, Guangzhou 510006, Guangdong, People's Republic of China. Additional authors for this research include H.C. Luo, L. Li, Z.L. Wei and B.C. Huang.
Keywords for this news article include: Asia, Guangdong, Molecular Catalysis, People's Republic of China
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2013, NewsRx LLC