International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2018-07-04 , DOI: 10.1016/j.ijhydene.2018.06.048 João Paulo da S.Q. Menezes , Robinson L. Manfro , Mariana M.V.M. Souza
Ni catalysts were prepared by wet impregnation of three different supports: alumina, niobia and 10 wt.% niobia/alumina, prepared by (co)precipitation. The catalysts were evaluated on steam reforming of glycerol at 500 °C, for 30 h. The catalyst supported on Nb2O5/Al2O3 presented the best performance, with higher conversion into gas (80%) during all reaction time and hydrogen yield of 50%. Alumina supported catalyst showed higher deactivation and lower hydrogen yield. All catalysts showed coke formation, but it was formed in larger amount on the catalysts supported on single oxides. A depth study was conducted to evaluate the effect of reaction variables as space velocity, glycerol concentration in feed and temperature on the catalytic performance of the Nb2O5/Al2O3 catalyst. Kinetic study was also performed for this catalyst using two different approaches, obtaining glycerol and steam orders, as well as the apparent activation energy.
中文翻译:
在氧化铝和氧化铌上负载的镍催化剂上的甘油蒸汽重整制氢:失活过程,反应条件的影响和动力学模型
Ni催化剂是通过湿法浸渍三种不同的载体制备的:氧化铝,氧化铌和10%(重量)的氧化铌/氧化铝,是通过(共)沉淀法制备的。在500°C的甘油蒸汽重整30小时的条件下对催化剂进行了评估。负载在Nb 2 O 5 / Al 2 O 3上的催化剂表现出最好的性能,在所有反应时间内转化成气体的比例更高(80%),氢气产率为50%。氧化铝负载的催化剂表现出更高的失活和更低的氢产率。所有催化剂均显示出焦炭形成,但是在负载于单一氧化物上的催化剂上形成了大量焦炭。进行了深入研究,以评估反应变量(如空速,进料中的甘油浓度和温度)对Nb 2 O 5 / Al 2 O 3催化剂的催化性能的影响。还使用两种不同的方法对该催化剂进行了动力学研究,获得了甘油和蒸汽量,以及表观活化能。