目前,选择性催化还原(SCR),要么是一氧化碳,尿素,碳氢化合物,氢气,或者氨作为还原剂,已成为许多催化公司和柴油机废气的氮氧化物(NOx)去除技术(NOx转化)。虽然,存在着低温限制的严重威胁。到目前为止,某些科学家已经表明,当使用氨作为还原剂时,钡基(Ba基)催化剂具有在低温下对NOx的SCR高度有效的潜力。替代SCR的NOx存储和还原过程称为稀薄NOx捕集器。在这里,我们给出了在NOx的低温NH3-SCR中涉及BaO的催化剂的浓缩进步和生产,与最近的热电催化相比,BaO催化剂的优势,BaO催化剂材料的稳定性,以及在NOx的低温NH3-SCR中涉及BaO的催化剂的浓缩进步和生产。这些催化剂是从它们的制备方法来看的,颗粒,和混合氧化物中的姿势。此外,在以下几个方面仔细考虑并简要介绍了Ba基催化剂的特性:制备方法和前体,结晶度煅烧温度,形态学,酸性位点,反应的比表面积,氧化还原性能,和催化剂的活化能。更多的是关于Eley-Rideal[E-R]和Langmuir-Hinshelwood[L-H]机制的讨论,H2O/SO2和O2的放任,以及Ba基催化剂上的NH3-SCR反应机理,突出了它们可能的影响。最后,提出了对NOx低温NH3-SCR的展望和未来可能的研究计划。
Presently, selective catalytic reduction (SCR), with either carbon monoxide, urea, hydrocarbons, hydrogen, or ammonia as a reductant, has become a nitrogen oxide (NOx) removal technology (NOx conversion) of many catalytic companies and diesel engine exhaust gas. Although, there exists a serious threat of low-temperature limitations. So far, certain scientists have shown that barium-based (Ba-based) catalysts have the potential to be highly effective at SCR of NOx at low temperatures when ammonia is used as the reducing agent. The process of NOx storage and reduction which alternate SCR is known as the Lean NOx trap. Herein, we give the condensed advancements and production of the catalysts that involve BaO in low-temperature NH3-SCR of NOx, the advantages of BaO catalysts compared to the recently hot electrocatalysis, the stability of BaO catalyst materials, and the condensed advancements and production of the catalysts that involve BaO in low-temperature NH3-SCR of NOx. These catalysts are viewed in the light of their preparation method, particulate, and posture in mixed oxides. Also, the characteristic features of Ba-based catalysts are carefully considered and briefed under the following areas: preparation method and precursor, crystallinity, calcination temperature, morphology, acid sites, the specific surface area for reaction, redox property, and activation energy of catalysts. More to these are the discussions on Eley-Rideal [E-R] and Langmuir-Hinshelwood [L-H] mechanisms, the H2O/SO2 and O2 permissiveness, and the NH3-SCR reaction mechanism over Ba-based catalysts highlighting their possible effects. Finally, we proposed the prospect and the likely future research plan for the low-temperature NH3-SCR of NOx.