首页|Revealing the Ca resistance enhancement mechanism for the NH3?SCR reaction over VTi catalyst by CuO modification
Revealing the Ca resistance enhancement mechanism for the NH3?SCR reaction over VTi catalyst by CuO modification
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NSTL
Elsevier
? 2022 Elsevier B.V.Currently, NOx emission control by the selective catalytic reduction of NOx with NH3 (NH3?SCR) technology for the cement industry has become urgent in China. The poisoning effect of Ca species from cement flue gas on V2O5/TiO2(V/Ti) catalysts still faces severe challenges. For the first time, CuO was investigated for the possibility of Ca resistance enhancement on V/Ti catalysts. The activity tests show that the Ca?CuV/Ti catalyst maintains a good performance with an NO conversion above 80% between 260 ? 330 °C, while the highest NO conversion of Ca?V/Ti in the test temperature range is only 52.4%. According to the characterization results, CaO is easier to adsorb on CuO than V2O5, thus retaining the V active sites. Due to the cycles of 2Cu2+ + V3+ ? 2Cu+ + V5+, CuO modification can significantly improve the redox ability of the V/Ti catalyst. In situ DRIFTS results show that the effect of CaO poisoning on the adsorption rate and reactivity of NHx over Ca?CuV/Ti is less than that of Ca?V/Ti. CaO even promotes the formation of the active nitrate species over CuV/Ti, which is the main reason for its strong Ca resistance. This study provides theoretical support for the industrial application of anti?Ca poisoning SCR catalysts.
CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Innovation Academy for Green Manufacture Chinese Academy of Sciences
Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences
NSTL
Elsevier
