Study On Preparation And Performance Of Catalysts For Boron Nitride Supported

The dry reforming of methane with carbon dioxide has received much attention because of the beneficial utilization of both methane and carbon dioxide which were two major greenhouse gases. Owing to the 1:1 ratio of the products, this reaction has a potentially important role in industry, such as Fisher-Tropsh synthesis and methanol synthesis. Through the reforming reaction, carbon dioxide can become a carbon source, to a certain extent, reduce greenhouse gas emissions. Therefore, in order to adapt to the restructuring of the energy and industrial needs, in recent years, more and more countries study the dry reforming of methane with carbon dioxide reforming launched a thorough study of the system.This selection of active components as catalyst method, using incipient wetness method, through the use of new boron nitride supported for the dry reforming of methane with carbon dioxide catalyst. Also choose the traditional Al2O3 supported as contrast experiment. The catalytic activity of the dry reforming of methane with carbon dioxide use a series of the catalysts, which Ni contents were between 5~20wt%. Through modern methods of characterization using XRD, SEM, BET and TG-DTA to test catalyst structure and investigate the influence factors of catalysts about supported and carbon deposition. The experimental results showed that the catalyst which using incipient wetness method, the distribution of active components in the spherical surface of the supported is uniform, The catalytic activity of the dry reforming of methane with carbon dioxide which using boron nitride supported better than using Al2O3 supported, The active components which Ni contents were 12wt% in 800℃, the conversion of methane and carbon dioxide were 95.3% and 93% is better than Al2O3 supported, when the reaction temperature rises, the conversion of carbon dioxide and methane are rising too; the higher temperature was, the better catalytic activity was. When the gas flow increases the conversion of methane and carbon dioxide decreased. Through the stability test, the stability of the reaction using BN supported better than Al2O3 supported.The influence of the supported and assistant catalytic for the dry reforming of methane with carbon dioxide was discussed. Through modern methods of characterization using SEM and TG, found using boron nitride supported has much better stability and assistant catalytic than Al2O3 supported. When joining the alkali metal and rare earth elements in the catalytic, the conversion of methane and carbon dioxide were not change, and the rare earth elements is good help of carbon deposition and ability, especially after joining the CeO2 contents was 10wt% in the catalytic for the dry reforming of methane with carbon dioxide, the catalytic active and resistance carbon deposition improved. Through modern methods of characterization, the characterization of catalyst surface carbon deposition is mainly filamentous. When joining the transition metal in the catalyst the reaction activity was restrained, is mainly by the transition metal and activity center in the active function, reduce the activity.