当前位置: X-MOL 学术Asia Pac. J. Chem. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Investigation on the catalytic combustion of CO over LaMn1‐xCuxO3 promoted by acid treatment
Asia-Pacific Journal of Chemical Engineering ( IF 1.8 ) Pub Date : 2021-11-04 , DOI: 10.1002/apj.2728
Qiwei Wu 1 , Hao Zhou 1
Affiliation  

There are large amounts of CO pollutants in the off-gas of the iron and steel industry, which cause serious harm to the environment and human health. To control the emission of CO more effectively, in this paper, LaMn1-xCuxO3 (x = 0, 0.25) perovskite catalysts were prepared and then modified by dilute nitric acid. And the physicochemical properties and the catalytic activity of perovskite were investigated and analyzed. The activity results indicate that the Cu2+ substitution and acid treatment could obviously promote the catalytic activity of catalysts for CO oxidation. Among the prepared samples, LaMn0.75Cu0.25O3-H exhibits the highest activity with 90% CO conversion at 176.5°C, and the self-sustained combustion of CO is successfully achieved. And the long-time stability test shows that LaMn0.75Cu0.25O3-H can keep 100% CO conversion, and the activity remains almost unchanged. Combined with the x-ray photoelectron spectroscopy (XPS) and H2 temperature-programmed reduction (H2-TPR) results, the increased activity of LaMn0.75Cu0.25O3-H catalyst is mainly ascribed to the high concentration of Mn4+ and abundant oxygen vacancies. On the other hand, the morphology of perovskite catalysts was remolded by acid etching, and the formation of the porous structure significantly increases the specific surface area. The above results show that the substitution of Cu and acid treatment for perovskite catalysts is a feasible strategy to improve CO catalytic combustion activity.

中文翻译:

酸处理促进 LaMn1-xCuxO3 催化 CO 燃烧的研究

钢铁工业废气中含有大量CO污染物,对环境和人体健康造成严重危害。为了更有效地控制CO的排放,本文制备了LaMn 1- x Cu x O 3 (x = 0, 0.25)钙钛矿催化剂,然后用稀硝酸对其进行改性。并对钙钛矿的理化性质和催化活性进行了考察和分析。活性结果表明,Cu 2+取代和酸处理能明显提高催化剂对CO氧化的催化活性。在制备的样品中,LaMn 0.75 Cu 0.25 O 3-H表现出最高的活性,在176.5°C时CO转化率为90%,成功实现了CO的自持燃烧。并且长期稳定性测试表明,LaMn 0.75 Cu 0.25 O 3 -H可以保持100%的CO转化率,活性几乎没有变化。结合X射线光电子能谱(XPS)和H 2程序升温还原(H 2 -TPR)结果,LaMn 0.75 Cu 0.25 O 3 -H催化剂活性的提高主要归因于高浓度的Mn 4+和丰富的氧空位。另一方面,钙钛矿催化剂的形貌通过酸蚀被重塑,多孔结构的形成显着增加了比表面积。上述结果表明,用Cu代替和酸处理钙钛矿催化剂是提高CO催化燃烧活性的可行策略。
更新日期:2021-11-04
down
wechat
bug