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Hydrogen production by glycerol steam reforming over Ni based catalysts prepared by different methods

机译：在不同方法制备的镍基催化剂上通过甘油蒸汽重整制氢

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摘要

Ni supported and co-precipitated catalysts promoted by Mg were evaluated for hydrogen production by the glycerol steam reforming. The samples were prepared by incipient wetness impregnation of alumina and by the continuous co-precipitation method. The catalysts were characterized by XRD, S-BET, TPR, NH3-TPD, TPO and SEM/TEM. The catalytic tests were performed in the range from 500 to 650 degrees C in a fixed bed tubular reactor. The gaseous products were analyzed online by gas chromatography. It was found that the partial substitution of Ni by Mg improves the dispersion of Ni, decreases the acidity of the catalysts and increases the resistance to sintering of Ni. The unreduced catalysts presented higher selectivity for H-2 than the previously reduced catalysts. The catalyst unreduced impregnated with 20% Ni showed the highest selectivity in the production of hydrogen (55%), at the temperature of 650 degrees C. Unreduced samples prepared by co-precipitation presented smaller Ni-0 crystallite size after the reaction. The catalyst reduction step is unnecessary for this reaction.
机译：通过甘油蒸汽重整评估了由Mg促进的Ni负载和共沉淀催化剂的产氢量。通过氧化铝的初期湿润浸渍和连续共沉淀法制备样品。通过XRD，S-BET，TPR，NH3-TPD，TPO和SEM / TEM对催化剂进行了表征。催化试验在固定床管式反应器中在500至650摄氏度的温度范围内进行。通过气相色谱在线分析气态产物。发现用Mg部分取代Ni可改善Ni的分散性，降低催化剂的酸度并增加对Ni的烧结的抵抗力。与以前还原的催化剂相比，未还原的催化剂对H-2的选择性更高。在650摄氏度的温度下，未还原的20％Ni浸渍催化剂在氢气生产中显示出最高的选择性（55％）。通过共沉淀制备的未还原样品在反应后呈现较小的Ni-0晶粒尺寸。该反应不需要催化剂还原步骤。

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