The present work is dedicated to the investigation of NO_x removal from flue gases, in particular to NO_x catalytic reduction by CO using monolith corrugated cylindrical Cu-Cr-based catalysts prepared by plasma spray coating technique. X-ray photoelectron spectroscopy was conducted to provide comprehensive information about oxidation states and chemical forms of main active components of the catalysts prepared. Investigation of NO_x catalytic reduction was carried out under different initial oxygen concentrations (0.0–0.1%, 0.6–0.7% and 1.2–1.3%) and gas flow velocities (0.1, 0.3 and 1.0 m/s) using different amount of catalysts and providing different residence time in the range of 0.1–3 s. The NO_x conversion achieved at 0.0–0.1% oxygen concentration was 50%, 75% and 88% for the residence time of 1 s, 2 s and 3 s. The corresponding NO_x conversion observed at the O₂ concentration of 0.6–0.7% was 37%, 60% and 70%. However, investigated Cu-Cr-based catalysts were found as ineffective at initial oxygen concentrations higher than 1% regardless the residence time. The dependence of NO_x conversion on residence time in general was represented by logarithmic regression and can be described by the following formula y = 23.962 ln(x) + 56.575, where “y” is NO_x conversion degree (%) and “x” denotes the residence time. It was demonstrated that NO_x conversion efficiency decreases along with increasing the gas flow velocity, which can be explained by reduction of residence time of a gas flow inside the catalysts. However, the obtained results revealed that using different gas flow velocities and providing the same residence time by changing the amount of catalysts, different NO_x conversion was observed. In particular the degree of NO_x reduction obtained at the gas flow velocity of 1 m/s was much lower than that achieved by applying lower gas flow velocity (0.3 m/s) regardless the residence time was the same. The negligible NO_x reduction was found for all cases when the gas flow velocity of 1 m/s was used. Therefore, it was supposed that the gas flow velocity of 1 m/s does not ensure the required mass transfer between the gas components and catalyst’s surface inhibiting the catalytic reaction to take place and resulting in extremely low NO_x conversion.

目前的工作是致力于NO的调查_X从烟道气中去除，特别是NO _X使用整料褶皱的圆柱形通过等离子体制备的Cu-Cr系催化剂喷涂技术催化还原由CO。进行了X射线光电子能谱分析，以提供有关所制备催化剂主要活性成分的氧化态和化学形式的全面信息。NO的调查_X催化还原反应不同的初始氧浓度（0.0-0.1％，0.6-0.7％和1.2-1.3％）和气流速度下进行的（0.1，0.3和1.0米/秒）使用不同量的催化剂和提供0.1–3 s范围内的不同停留时间。该NO _X在1 s，2 s和3 s的停留时间下，在氧气浓度为0.0–0.1％时实现的转化率分别为50％，75％和88％。相应的NO _X在将O观察到的转化率₂的0.6-0.7％的浓度为37％，60％和70％。但是，无论停留时间如何，都发现研究的基于Cu-Cr的催化剂在初始氧浓度高于1％时无效。NO的依赖性_X上在一般的停留时间转化率通过对数回归表示，并且可以通过以下公式y = 23.962 LN（X）+ 56.575，其中“y”为NO，说明_X转化程度（％）“×”表示停留时间。证明了NO _x转化效率随着气体流速的增加而降低，这可以通过减少气体在催化剂内部的停留时间来解释。但是，获得的结果表明，使用不同的气体流速并通过改变催化剂的量提供相同的停留时间，观察到不同的NO _x转化率。特别地，无论停留时间相同，在1m / s的气体流速下获得的NO _x还原度都比通过施加较低的气体流速（0.3m / s）所获得的还原度低得多。可以忽略的NO _X当使用1 m / s的气体流速时，所有情况均降低。因此，认为1m / s的气体流速不能确保在气体组分和催化剂表面之间所需的传质，从而抑制了催化反应的发生并导致极低的NO _x转化率。