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Xiaokang Yan,Shu-Bao Shen,Qiong Huang,Bing Li,Xiaoliang Xu,Ying-Wen Chen,She-Min Zhu 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Catalytic combustion of CO over perovskite-type oxides LaCo0.5M0.5O3 (M = Mn, Cr, Fe, Ni, Cu) and LaCo0.5Mn0.5O3 supported on cordierite were investigated. The catalysts were synthesized by impregnation method with citrate and characterized by XRD, SEM and TPR. The LaCo0.5Mn0.5O3catalyst showed much higher activity in CO oxidation compared with LaCo0.5M0.5O3 (M = Cr, Fe, Ni, Cu)due to different kinds of valence state and lattice oxygen content. When LaCo0.5Mn0.5O3 was supported on cordierite, the activity was improved significantly. However, calcining temperature and the presence of water vapor affected the catalytic activity due to sintering and competition of H2O with CO for adsorption, respectively.
Qiong Huang,Shu-Bao Shen,Xiaokang Yan,Bing Li,Xiaoliang Xu,Ying-Wen Chen,She-Min Zhu 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Several catalysts of the general formula, MMnOx (M = Co, Ni, Fe and Cu), were synthesised through the impregnation method; their activities were shown to be enhanced by the addition of a small amount of Pd (0.01–0.1 wt%). These catalysts exhibit different activities for the catalytic oxidation of CO, due to the different valence states of various transition metal oxides. The introduction of Pd prominently enhanced both the reduction and oxidation capabilities of the catalysts. These catalysts were optimised for oxidation activities by designing orthogonal experiments. Based upon the catalysts’ properties, the stability of these samples and their ability to resist steam over Pd/CoMnOx/cordierite were investigated.
Li Li,Ning Xu,Aimin Wu,Hao Ling,Jian Sun,Xiaokang Shen 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Nanocrystalline carbon nitride (CNx) thin ¯lms have been synthesized by nitrogen-plasma-assisted pulsed-laser deposition. Before depositing carbon nitride ¯lm, Ni/Co was deposited on the silicon (100) substrate acting as catalyst. The properties of the deposited ¯lms were studied by several diagnostic techniques. X-ray photoelectron spectroscopy was used for detecting the compo-sition ratio N/C in the ¯lm. From studying Raman spectra under dierent conditions we can ¯nd how glow discharge pressure aects the carbon nitride ¯lm properties. Two stages in this process and nanocrystallites of tens of nanometers embedded in the as-synthesized thin ¯lm can be seen by transmission-electron microscopy. The FTIR spectrum suggests an abundance of C-N bonds and paucity of C´N bonds, which is a favorable chance for the formation of carbon nitride crystallites. The crystalline nature of the ¯lm is detected by X-ray diraction.