固定床中甘油催化重整制氢

Hydrogen Production by Catalytic Steam Reforming of Glycerol in a Fixed Bed

以白云石为载体,采用共沉淀法制备了一系列Ni基催化剂,选取甘油作为生物质裂解油的模拟物,在固定床反应器中进行甘油重整制氢反应,探索了催化重整制氢反应条件和反应规律.采用XRD和SEM方法对催化剂进行了表征,并通过TG方法分析了催化剂的积碳情况.实验结果表明,在Ni/DM（DM表示白云石）催化剂中添加氧化物MgO或MoO3可提高催化剂的活性,有效降低碳的沉积速率.选择Ni/Mo-MgO-DM催化剂,以气体产物中H2,CO,CH4,CO2的含量为指标,考察了反应温度、水蒸气与甘油中碳的摩尔比（水碳比）和进料空速对甘油重整制氢反应的影响,获得的较佳反应条件为：反应温度650～ 700℃、水碳比8～ 10、进料空速2.4～ 3.6 h-1.在此条件下,气体产物中H2含量能达到74％（x）以上.

A series of Ni-based catalysts were prepared by co-precipitation method with dolomite（DM） as support. The catalytic steam reforming of glycerol which was selected as a model compound of bio-oil from biomass pyrolysis was studied over the Ni-based catalysts in a fixed bed reactor. The catalysts were characterized by means of XRD and SEM, and the carbon deposition was analyzed by means of TG. The results showed that the addition of MgO and/or MoO3 to the Ni-dolomite catalysts could improve the catalyst activity greatly and reduce the rate of the carbon deposition effectively. The influences of temperature, ratio of steam to carbon （n（H20） ： n（C）） and feeding space velocity on the catalytic steam reforming were investigated. Under the optimum conditions of Ni/Mo- MgO-DM as the catalyst, reaction temperature 650-700℃, n（H20） ： n（C） 8-10 and feeding space velocity 2.4-3.6 h1, the H2 content in the products could reach more than 74%（x）.