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首页> 外文期刊>Catalysis science & technology >Highly efficient Ru/CeO2 catalysts for formaldehyde oxidation at low temperature and the mechanistic study
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Highly efficient Ru/CeO2 catalysts for formaldehyde oxidation at low temperature and the mechanistic study

机译：高效的俄文/ CeO2的催化剂在低温度和甲醛氧化机械的学习

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Formaldehyde (HCHO) elimination at low temperature is of great interest for indoor air purification. In this work, 1 wt% Ru supported on CeO2 and Al2O3 catalysts were prepared by an impregnation method and subsequently tested for the catalytic oxidation of HCHO at low temperature. The activity of the Ru/CeO2 catalyst was significantly superior to the Ru/Al2O3 catalyst, achieving complete conversion of 130 ppm HCHO at 90 °C with a GHSV of 100 000 mL gcat−1 h−1. Brunauer–Emmett–Teller (BET) measurements, X-ray powder diffraction (XRD), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray photoelectron spectroscopy (XPS) and H2-temperature-programmed reduction (H2-TPR) were carried out to characterize the physical and chemical properties of the catalysts. The results revealed that RuOx species, rather than Ru0, were directly responsible for the HCHO oxidation over Ru/CeO2, and the excellent performance of Ru/CeO2 was mainly attributed to the strong interaction between Ru and CeO2, which induced a high dispersion and high redox capacity of RuOx species. The reaction mechanism of HCHO oxidation was also investigated using in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS). It was shown that the HCHO oxidation over the Ru/CeO2 and Ru/Al2O3 catalysts followed the same pathway of the direct formate oxidation (HCHO → HCOO + OH → H2O + CO2).
机译：低温甲醛(一氧化碳)消除对室内空气净化的极大兴趣。在这个工作中,1 wt %俄文CeO2和支持氧化铝催化剂由浸渍测试方法和随后的催化低温氧化的一氧化碳。活动是俄文/ CeO2的催化剂明显优于俄文/氧化铝催化剂,实现完整的130 ppm一氧化碳的转换90°C GHSV 100 000毫升gcat−1 h−1。Brunauer-Emmett-Teller(打赌)测量、x射线环形粉末衍射(XRD),暗视野扫描透射电子显微镜(HAADF-STEM), x射线光电子能谱(XPS)和H2-temperature-programmed减少(H2-TPR)进行描述的物理和化学性质的催化剂。物种,而不是Ru0,直接负责一氧化碳氧化/俄文/ CeO2,和俄文/ CeO2的优良性能主要归因于强相互作用俄文和CeO2之间,诱导高RuOx色散和高氧化还原能力物种。还研究了用原位分散吗反射红外傅里叶变换原位光谱(飘)。一氧化碳氧化/俄文/ CeO2和俄文/氧化铝催化剂遵循相同的直接途径甲酸氧化(一氧化碳→HCOO +哦→水+二氧化碳)。

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