Study On The Scale Up Preparation Of Ni-Co Bimetallic Catalyst For Biogas Reforming To Hydrogen

The demand of energy for the social development is ever-increasing, but the main source of energy for human use today is still based on fossil fuels, such as coal, oil and natural gas. Fossil fuels resouces are limited and the mining, processing and usage of them have brought to mankind serious environmental pollution. Therefore, the development and use of renewable, environmentally friendly clean energy is a must and the best way to maintain sustainable economic and social development. Hydrogen, as a renewable and environment-friendly energy carrier, is expected to be one of the main energy sources in the21st century and is therefore considered to be the ideal alternative energy sources of fossil energy in the future.In the previous work, we have developed powder alumina and commercially spherical alumina carrier supported methane dry reforming catalyst Ni/La2O3-γ-Al2O3with great activity, anti-coking ability and stability. In this paper, the influence of second active metal component, particle size of the carrier, catalyst preparation scale and the batches on the performance of the catalyst was investigated.The results show that:1) Adding a second active metal component could significantly enhances the interaction of the metal catalyst with the carrier, the activity and the anti-coking ability of the catalyst, and the optimum catalyst should be NiCo/La2O3-γ-Al2O3.2) As the particle size of the carrier increases from1.5mm,2.5mm to3.5mm, an acceptable decline in the performance of their activity and resistance to coking was detected. Within consideration of the industrial application conditions, the performance of the catalyst supported on carrier with particle size of3.5mm is basically desirable.3) The activity of the catalysts was intimate with preparation scale. As the preparation scale rising from5,100to200g, the performance of the catalyst, such as the activity and the anti-coking ability, decreased indistinctly after a reaction with9h, which suggests that excessive dipping was feasible for the scale up preparation of Ni/La2O3-γ-Al2O3catalyst.4) the measurement results of catalysts prepared by different impregnation batches showed that the performance of the catalyst is intimate with the preparation batch. With the increase of the dipping batches, the activity of the catalyst decreased to some extent, but the downward trend tend to be alleviate when the dipping batches further increase; the rule could apply to the anti-coking ability as well. So, the excessive dipping method is suitable to the scale up preparation of Ni/La2O3-γ-Al2O3catalyst..