Herrera Josefina, Aguila Gonzalo, Zhu Ye, Xu ZhiHang, Guerrero Ruz Sichem
Universidad de los Andes, Chile, Facultad de Ingeniería y Ciencias Aplicadas, Monseñor Álvaro del Portillo, 12455 Las Condes, Chile.
Departamento de Ciencias de la Ingenieria, Facultad de Ingenieria, Universidad Andres Bello, Avenida Antonio Varas 880, Providencia, Santiago 7500971, Chile.
ACS Omega. 2024 Sep 21;9(39):40394-40410. doi: 10.1021/acsomega.4c02423. eCollection 2024 Oct 1.
The pollution from industrial processes based on biomass combustion is still an ongoing problem. In the present contribution, the selective catalytic reduction of NO with CO and naphthalene is carried out in the presence of 10% oxygen. The accumulation of alkaline and alkaline earth metals during biomass combustion is here simulated by the addition of calcium to a Cu-impregnated YCeO-TiO support. The results show that a high dispersion of copper is obtained, which is resistant to the accumulation of calcium. Full conversion of CO and naphthalene is achieved above 200 °C, whereas NO conversions of 80, 90, and 87% are obtained for the catalysts with Ca loadings of 2.6, 5.2, and 13%, respectively, at 350 °C. It is proposed that the high activity of the catalysts is ascribed to the formation of Cu-O-Ce species and that the accumulation of Ca acts as a barrier to avoid copper sintering. It was found that different forms of carbonate and nitrite/nitrate species form during reaction, coexisting as adsorbed species during the SCR reaction. The selectivity to N was almost 100% in all cases, due to the small presence of NO in the reactor outlet (no NO was detected in any conditions).
基于生物质燃烧的工业过程污染仍是一个持续存在的问题。在本论文中，在10%氧气存在的条件下进行了用CO和萘对NO的选择性催化还原。通过向负载铜的YCeO-TiO载体中添加钙来模拟生物质燃烧过程中碱金属和碱土金属的积累。结果表明，获得了高分散的铜，其对钙的积累具有抗性。在200℃以上实现了CO和萘的完全转化，而在350℃时，钙负载量分别为2.6%、5.2%和13%的催化剂的NO转化率分别为80%、90%和87%。提出催化剂的高活性归因于Cu-O-Ce物种的形成，并且钙的积累起到了避免铜烧结的屏障作用。发现在反应过程中形成了不同形式的碳酸盐和亚硝酸盐/硝酸盐物种，在选择性催化还原反应期间作为吸附物种共存。由于反应器出口处NO的存在量很少（在任何条件下均未检测到NO），在所有情况下对N的选择性几乎为100%。
