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The addition of hydrogen in the reaction atmosphere is effective in promoting the activity of Ag/alumina and Ag-zeolites on the selective reduction of NO by hydrocarbons (HC-SCR) at low temperatures. The increment of NO conversion over Ag-MFI corresponds to the periodic addition of hydrogen into C3H8-SCR conditions. The UV–VIS spectra of Ag-MFI have revealed that the addition of hydrogen results in...
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