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中国博士后科学基金(20070410196)

作品数:3 被引量:10H指数:2
相关作者:贾莉伟王军沈美庆更多>>
相关机构:天津大学更多>>
发文基金:中国博士后科学基金国家高技术研究发展计划江苏省博士后科研资助计划项目更多>>
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Redox behaviors and structural characteristics of Mn_(0.1)Ce_(0.9)O_x and Mn_(0.1)Ce_(0.6)Zr_(0.3)O_x被引量:4
2008年
Mn0.1Ce0.9Ox and Mn0.1Ce0.6Zr0.30x samples synthesized by sol-gel method were tested for redox properties through the dynamic oxygen storage measurement and characterized using X-ray diffraction, BET, electron paramagnetic resonance, and X-ray photoelectron spectroscopy. The results showed that redox performances of ceria-based materials could be enhanced by synergetic effects between Mn-O and Ce-O. Fresh and aged samples were characterized with the fluorite-type cubic structure similar to CeO2, and furthermore, the thermal stability of Mn0.1Ce0.9Ox materials was improved by the introduction of some Zr atoms. From XPS, it could be concluded that Mn^2+/Mn^3+ redox couples existed on the surface of Mn0.1Ce0.9Ox and Mn0.1Ce0.6Zr0.3Ox samples. Electron paramagnetic resonance researches revealed that there were three types of Mn^2+ species: isolated Mn^2+ substituting for Ce^4+ ions in the lattice with a cubic symmetry, ones in defect with a noncubic symmetry, and at the surface of samples.
贾莉伟沈美庆王军褚霞王家明胡志成
漆包机废气净化催化剂的研制被引量:4
2008年
以γ-Al2O3、铈锆固溶体(Ce0.67Zr0.33O2)、以及两者混合物为二载涂层,制备了3种蜂窝瓷漆包机废气净化Pd催化剂,评价其对苯、二甲苯与甲酚催化燃烧的活性。结果表明,γ-Al2O3与Ce0.67Zr0.33O2混合涂层具有良好的催化活性。采用XRD与BET表征手段,分析了γ-Al2O3与Ce0.67Zr0.33O2混合涂层具有较好的抗烧结能力,有助于保持活性组分高度分散。
贾莉伟沈美庆王军
关键词:催化剂工程催化燃烧废气净化漆包机
Durability of three-way and close-coupled catalysts for Euro IV regulation被引量:2
2008年
The durability of three-way catalyst (TWC) and corresponding close-coupled catalyst (CCC) for Euro Ⅳ stage regulation was investigated through Vehicle Road Running Mode tests, whereas emissions of regulated pollutants of three car fleet were investigated at every 100,000 km miles. The results showed that HC, NOx, and CO emission values could meet Euro Ⅳ regulation limits at every point. The redox properties of TWC and CCC were measured by CO reduction during each isothermal. It was obvious that both aged TWC and aged CCC behaved a good redox property at 673 and 773 K. Based on XRD and BET measurement results, TWC and CCC washcoat were characterized with good thermal stability.
贾莉伟沈美庆王军王家明褚霞顾炜炜
关键词:DURABILITY
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