NO_x in the flue gas from aluminum hydrate calcining process is the main emission source among the aluminum manufacture industries. The water vapor, various aluminum compounds, and sodium compounds in alumina calcining flue gas affect the NH₃-SCR reaction. In this study, we investigated the deactivation mechanism by alkali metals via doping of Al₂O₃, Al(OH)₃, Na₂O, and NaOH over commercial V₂O₅-WO₃/TiO₂ catalysts. The results indicated that the doping of Al₂O₃, Al(OH)₃, NaOH, and Na₂O reduced the NH₃-SCR activities and it followed the order of NaOH > Na₂O > Al₂O₃ ∼ Al(OH)₃. The injection of water vapor could result in about 20% NO conversation efficiency decreasing. According to the intoxication mechanism study, Al species tend to reduce Lewis acidic sites and Na compounds could decrease both Brønsted and Lewis acidic sites. Na has strong interaction with active V species, with decrease of V⁵⁺ species and the reducibility. Al has a weak binding tendency with both V and W, with decrease of NH₃ absorption on V species and electron density around W. This study was favorable for further SCR catalyst modification and application in the manufacture industry.

在铝水合物煅烧过程中，烟道气中的NO _x是铝制造行业中的主要排放源。氧化铝煅烧烟道气中的水蒸气，各种铝化合物和钠化合物影响NH ₃ -SCR反应。在这项研究中，我们研究了碱金属通过在工业V ₂ O ₅ -WO ₃ / TiO ₂催化剂上掺杂Al ₂ O ₃，Al（OH）₃，Na ₂ O和NaOH来钝化的机理。结果表明，Al ₂ O ₃，Al（OH）₃，NaOH和Na ₂的掺杂Ó减小NH _3个-SCR活动和它随后的氢氧化钠>的Na顺序₂ O>的Al ₂ ö ₃〜的Al（OH）₃。注入水蒸气可能导致NO转换效率降低约20％。根据中毒机理研究，Al物种倾向于减少Lewis酸性位点，而Na化合物可以减少Brønsted和Lewis酸性位点。Na与活泼的V物种有很强的相互作用，V ⁵⁺物种的减少和还原性。Al与V和W的结合趋势均较弱，NH ₃含量降低 对V物种的吸收和W附近的电子密度。这项研究有利于SCR催化剂的进一步改性和在制造业中的应用。