Role of sulphates on the mechanism of NH3-SCR of NO at low temperatures over presulphated vanadium supported on carbon-coated monoliths
作者： M LAZARO , R MOLINER , J FIERRO , E GARCIABORDEJE , J PINILLA
DOI: 10.1016/J.JCAT.2005.04.032
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摘要: A novel catalyst was prepared by sulphation of vanadium supported on carbon-coated monoliths with a mixture SO2 + O2 at 473 K. The as-sulphated shows about twofold higher conversion than the fresh in selective catalytic reduction NO low temperatures (<473 K<473 K) after an induction period. increase activity during period is correlated buildup more stable sulphate species. sulphated characterised temperature-programmed desorption, photoelectron spectroscopy, reaction, and transient response techniques. We have found evidence indicating that sulphates are anchored to carbon vicinity vanadyl sites. This fact can account for improvement redox properties catalyst. On basis experimental results, enhancement properties, rather acidity, cause superior performance compared one.
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