摘要:
Articles comprising a catalyst film comprising VOx, MoO3 or WO3, and TiO2 deposited on a substrate are disclosed. The articles are useful for selective catalytic reduction (SCR) of NOx in exhaust gases. Methods for producing such articles deposit a catalyst film on the substrate to form a coated substrate, which is then calcined. When used in an SCR process, the coated articles have enhanced activity for NOx conversion, reduced activity for SOx conversion, or both. Light-weight, coated articles having high catalyst loads can be fabricated at the same or reduced dimensions when compared with laminated articles, and increased kNOx/kSOx ratios are available even from coated articles having relatively thin catalyst films. The articles should have particular value for power plant operations, where coal and high-sulfur fuels are commonly used and controlling sulfur trioxide generation is critical.
摘要:
A catalyst for treating an exhaust gas comprising SO2, NOx and elemental mercury in the presence of a nitrogenous reductant comprises a composition containing oxides of: (i) Molybdenum (Mo) and optionally Tungsten (W); and (ii) Vanadium (V); and (iii) Titanium (Ti); and(iv) Phosphorus (P), wherein, with respect to the total metal atoms in the composition, the composition comprises: (i) Mo in an amount of less than 2 at. %, and optionally up to 9 at. % W; (ii) from 2.5 to 12 at. % V; (iii) from 85 to 96 at. % Ti, and wherein the composition comprises (iv) P in an atomic ratio to the sum of atoms of Mo, W and V of from 1:2 to 3:2. The values expressed must total 100%.
摘要:
Articles comprising a catalyst film comprising VOx, MoO3 or WO3, and TiO2 deposited on a substrate are disclosed. The articles are useful for selective catalytic reduction (SCR) of NOx in exhaust gases. Methods for producing such articles deposit a catalyst film on the substrate to form a coated substrate, which is then calcined. When used in an SCR process, the coated articles have enhanced activity for NOx conversion, reduced activity for SOx conversion, or both. Light-weight, coated articles having high catalyst loads can be fabricated at the same or reduced dimensions when compared with laminated articles, and increased kNOx/kSOx ratios are available even from coated articles having relatively thin catalyst films. The articles should have particular value for power plant operations, where coal and high-sulfur fuels are commonly used and controlling sulfur trioxide generation is critical.
摘要翻译:公开了包含一种包含VO x,MoO 3或WO 3的催化剂膜和沉积在基板上的TiO 2的制品。 这些制品可用于废气中NOx的选择性催化还原(SCR)。 制造这种制品的方法在基材上沉积催化剂膜以形成涂覆的基材,然后将其煅烧。 当用于SCR工艺时,涂层制品具有增强的NOx转化活性,减少SOx转化的活性或两者。 与层压制品相比,可以以相同或较小的尺寸制造具有高催化剂载荷的轻质涂层制品,并且甚至可以使用具有相对薄的催化剂膜的涂布制品提高kNO x / k SO x比。 这些物品对于电厂运行具有特别的价值,其中通常使用煤和高硫燃料,并控制三氧化硫的生成至关重要。
摘要:
A catalyst for treating an exhaust gas comprising SO2, NOx and elemental mercury in the presence of a nitrogenous reductant comprises a composition containing oxides of: (i) Molybdenum (Mo) and/or Tungsten (W); (ii) Vanadium (V); (iii) Titanium (Ti), and (iv) an MFI zeolite, wherein the composition comprises, based on the total weight of the composition: (i) 1 to 6 wt % of MoO3 and/or 1 to 10 wt % WO3; and (ii) 0.1 to 3 wt % V2O5, and (iii) 48.5 to 94.5 wt % TiO2; and (iv) 35 to 50 wt % MFI zeolite.