Cryptomelane-type Ni-doped MnOx catalysts (NMOs) prepared by solvent-free doping method showed very attractive performances in wide temperature zones and stability for selective catalytic reduction (SCR) at 100–300 ℃. The effect of Ni loading on NH₃-SCR activity at medium temperature (200–300 ℃) was investigated. The NMOs-4 catalyst not only maintained excellent low temperature (100–200 ℃) NH₃-SCR activity, the NO conversion was approached to 100 %, but also significantly improved the medium temperature activity while the NO conversion increased from 54.4% to 87.2% at 300 ℃ (T₉₅ = 100–265 ℃) compared with undoped MOs catalyst (T₉₅ = 100–225 ℃). Appropriate Ni loading could effectively tune the surface lattice oxygen activity and acidity of catalyst to ensure the NH₃ activation ability at low temperature and inhibit the occurrence of NH₃ direct oxidation at higher temperature. On other words, moderate NH₃ activation capacity was the key to achieve a wide temperature region of MnOx-based catalysts.

用无溶剂掺杂法制备的Cryptomelane型镍掺杂MnOx催化剂（NMOs）在宽温度范围内表现出非常诱人的性能，并且在100-300℃下具有选择性催化还原（SCR）的稳定性。研究了中温（200-300℃）下镍的添加量对NH ₃ -SCR活性的影响。NMOs-4催化剂不仅保持了优异的低温（100–200℃）NH ₃ -SCR活性，NO转化率接近100％，而且显着提高了中温活性，同时NO转化率从54.4％提高到87.2。与未掺杂的MOs催化剂（T ₉₅）相比，在300℃（T ₉₅ = 100–265℃）时的％= 100–225℃）。适当的Ni负载量可以有效地调节催化剂的表面晶格氧活性和酸度，以确保低温下的NH ₃活化能力，并抑制高温下NH ₃直接氧化的发生。换句话说，适度的NH ₃活化能力是实现MnOx基催化剂宽温度范围的关键。