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Preparation and Catalytic Performance Research of LaCoO3 Rare-earth Perovskite Catalysts

Author: HanFuYong
Tutor: GuoXiKun
School: Shantou University
Course: Industrial Catalysis
Keywords: Three-way catalyst Sol-gel method Rare earths Cobalt Lanthanum
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 70
Quote: 0
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Abstract


With the extensive use of fossil fuels, emissions of nitrogen oxides (NO accounted for more than 90%), carbon monoxide (CO) and hydrocarbons worsening. The three types of gas not only pollute the environment and affect the normal life of humanity, will directly endanger human health, therefore, developed a way to while effectively eliminating the three types of harmful gases in the three-way catalyst (Three Way Catalyst), many environmental and chemical work by one of the focus. The three-way catalyst, has been used basically using a noble metal as the active ingredient, although the catalytic performance is better, but less expensive noble metal reserves, it is difficult to generally promote. New efficient non-precious metal catalyst research hotspot in recent years. This article was prepared and has a good three-way catalytic properties of new rare-earth perovskite-type composite oxide catalyst. First, using the sol-gel method LaCoO3 investigated its A bit doped metal ions, and both La0.8Sr0.2CoO3 and La0.8Ce0.2CoO3 the catalytic better catalyst; Second, the effects of two Catalyst B site doping the case of other metal ions, resulting the Lao.8Sro.2Coo.8Feo.2O3 and Lao.8Ceo.2Coo.8Cuo.2O3 two kinds of perovskite-type catalyst having a three-way catalytic performance. Active the test analysis catalytic performance, and using a scanning electron microscope (SEM), X-ray diffraction (XRD), modern analytical methods of catalyst structures were characterized to study the performance of the catalyst and the structure of the relationship. The findings of La0.8Sro.2Co0.8Fe0.2O3 show that it has a good three-way catalytic performance, C3H6, CO and NO are lower ignition temperature, respectively, 250 ° C, 150 ° C and 243 ° C; Sr and Fe added in the same time maintaining the perovskite-type structure, resulting in a structural distortion and increasing the ratio of surface area of ??the catalyst to improve the three-way catalytic performance. The results show that the study of La0.8Ce0.2Co0.8Cu0.2O3 has a good three-way catalytic performance, the ignition temperature of C3H6, CO and NO are lower, respectively, 230 ° C, 200 ° C and 225 ° C in 450 ℃ before three gases can be completely transformed. Characterization results show, forming a complete La0.8Ce0.2Co0.8Cu0.2O3 perovskite structure, the introduction of Ce and Cu obviously refine the catalyst particles, increasing the dispersion and the catalyst has a specific surface area of ??the active oxygen vacancies, thereby improving the catalyst The three-way catalytic performance.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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