The simultaneous control of toluene and NO_x was investigated on a series of MnO_x-CeO₂ catalysts, in which NO_x was removed in selective catalytic reduction with NH₃ into N₂, and toluene was removed in catalytic combustion into CO₂. We identified the deactivation effect of the MnO_x-CeO₂ SCR catalyst in the presence of toluene. The NO conversion and N₂ selectivity significantly decrease by 50 ppm toluene in the NH₃-SCR feed gas. The competitive adsorption of toluene and the deposition of by-products on catalyst surface lead to a considerable decrease in NH₃ adsorption. The formation of active Lewis acid sites are dramatically restrained. Meanwhile, the toluene adsorption promotes the formation of oxygen vacancies, increasing the unfavored oxidation reactions of NH₃ (non-selective catalytic reduction, NSCR etc.) instead of standard SCR reaction, leading to a significantly decrease in the N₂ selectivity. Toluene inhibits the low-temperature SCR activity over MnO_x-CeO₂ catalysts mainly through the Eley-Rideal mechanism.

在一系列MnO _x -CeO ₂催化剂上研究了甲苯和NO _x的同时控制，其中通过用NH ₃选择性催化还原为N ₂除去NO _x，并通过催化燃烧将CO ₂除去甲苯。我们确定了在甲苯存在下MnO _x -CeO ₂ SCR催化剂的失活作用。在NH ₃ -SCR进料气中，NO转化率和N ₂选择性显着降低50 ppm甲苯。甲苯的竞争性吸附和副产物在催化剂表面的沉积导致NH的显着降低₃吸附。活性路易斯酸位的形成受到显着抑制。同时，甲苯吸附促进氧空位的形成，增加了NH ₃的不利氧化反应（非选择性催化还原，NSCR等），而不是标准SCR反应，从而导致N ₂选择性大大降低。甲苯主要通过Eley-Rideal机理抑制MnO _x -CeO ₂催化剂的低温SCR活性。