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首页> 外文OA文献 >Síntese e caracterização de catalisadores de LaNiO3 não suportados e suportados em Al2O3 e ZrO2 para a reforma a vapor do metano
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Síntese e caracterização de catalisadores de LaNiO3 não suportados e suportados em Al2O3 e ZrO2 para a reforma a vapor do metano

机译：非LaNiO3催化剂的合成与表征在Al2O3和ZrO2中担载和担载甲烷蒸汽重整

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Ionic oxides with ABO3 structure, where A represents a rare earth element or an alkaline metal and B is a transition metal from group VIII of the periodic table are potential catalysts for oxidation and good candidates for steam reforming reaction. Different methods have been considered for the synthesis of the oxide materials with perovskite structure to produce a high homogeneous material with low amount of impurities and low calcination temperatures. In the current work, oxides with the LaNiO3 formula had been synthesized using the method of the polymeric precursors. The thermal treatment of the materials took place at 300 ºC for 2h. The material supported in alumina and/or zirconia was calcined at 800 ºC temperature for 4h. The samples had been characterized by the following techniques: thermogravimetry; infrared spectroscopy; X-ray diffraction; specific surface area; distribution of particle size; scanning electron microscopy and thermo-programmed reduction. The steam reforming reaction was carried out in a pilot plant using reducing atmosphere in the reactor with a mixture of 10% H2-Argon, a mass about 5g of catalyst, flowing at 50 mL.min-1. The temperature range used was 50 - 1000 oC with a heating rate of 10 oC.min-1. A thermal conductivity detector was used to analyze the gas after the water trapping, in order to permit to quantify the consumption of hydrogen for the lanthanum nickelates (LaNiO3). The results showed that lanthanum nickelate were more efficient when supported in alumina than when supported in zirconia. It was observed that the methane conversion was approximately 100% and the selectivity to hydrogen was about 70%. In all cases were verified low selectivity to CO and CO2
机译：具有ABO3结构的离子氧化物，其中A表示稀土元素或碱金属，B是元素周期表第VIII族的过渡金属，是氧化的潜在催化剂，也是蒸汽重整反应的良好候选物。已经考虑了多种方法来合成具有钙钛矿结构的氧化物材料，以生产具有低杂质含量和低煅烧温度的高均质材料。在当前的工作中，已经使用聚合物前体的方法合成了具有LaNiO3分子式的氧化物。材料的热处理在300ºC下进行了2h。负载在氧化铝和/或氧化锆中的材料在800℃的温度下煅烧4小时。样品已通过以下技术进行了表征：热重法；红外光谱X射线衍射;比表面积；粒度分布；扫描电子显微镜和热编程还原。蒸汽重整反应在中试装置中进行，使用反应器中的还原气氛与10％H 2-氩气，质量约5g催化剂的混合物在50mL.min-1下流动。所使用的温度范围为50-1000 oC，加热速率为10 oC.min-1。为了对镍酸镧（LaNiO3）的氢消耗进行量化，使用了热导检测器来分析捕集水后的气体。结果表明，镍酸镧在氧化铝中的负载比在氧化锆中的负载更有效。观察到甲烷的转化率约为100％，对氢的选择性约为70％。在所有情况下均已证明对CO和CO2的选择性低

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