Abstract

Nitric oxide desorption from the surfaces of supported copper-containing catalysts (CuO/γ-Al₂O₃) as a function of temperature is studied. NO preadsorption occurs both in an inert medium of argon and in the presence of oxygen. It is shown that the presence of oxygen considerably raises the capacity of the samples with respect to NO, due to the activation of a supplementary redox mechanism. In addition, the maximum desorption temperature shifts to the region of higher temperatures. For a sample exhibiting the highest capacity with respect to NO, the desorption process is conducted using hydrogen and propane as reducing agents. Desorption with hydrogen leads to the reduction of adsorbed species at temperatures of 160–190°C. With propane, NO_x desorption proceeds mostly due to the thermal degradation of adsorbed nitrogen species to NO in the temperature range of 180–250°C, as in an inert atmosphere. The contribution from reduction due to the presence of propane manifests at temperatures of 260–300°C.

中文翻译：

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研究含或不含还原剂的CuO /γ-Al2 O 3催化剂表面一氧化氮的解吸阶段

摘要

从支持的含铜催化剂的表面的一氧化氮脱附（的CuO /γ-Al系₂ ö ₃）作为温度的函数进行了研究。在氩气的惰性介质中和氧气的存在下均不会发生预吸附。结果表明，由于辅助氧化还原机制的激活，氧气的存在大大提高了样品的NO容量。另外，最大的解吸温度转移到较高温度的区域。对于显示出相对于NO最高容量的样品，使用氢气和丙烷作为还原剂进行解吸过程。氢气的解吸导致在160–190°C的温度下吸附物质的减少。使用丙烷，NO _x脱附的发生主要是由于在惰性气氛下，在180–250°C的温度范围内，吸附的氮物质热降解为NO。由于丙烷的存在，还原反应的贡献体现在260–300°C的温度下。