Pressurized Conversion Of Methane,air And Steam To Synthesis Gas

The partial oxidation of methane to synthesis gas (POM) has been one of the effective integrated utilization pathways of natural gas. Compared with traditional steam reforming of methane, it has many advantages such as high reaction rate, low energy consumption, little equipment investment and a H2/CO ratio of 2. As most research about partial oxidation of methane to syngas is under normal pressure at present, whereas much subsequent industrial process of syngas to afterward product is usually operated under higher pressure, on the basis of the former research work, the investigation of POM under pressurized condition has been focused in this thesis. Because in the reaction system of methane and oxygen under pressurized condition, explosion occurs easily, carbon is easy to deposit on the catalyst surface, and hot spot is evident in catalyst bed, the reaction system of methane, air and water is employed to study catalytic performance of POM on Ni catalysts, the results show that the catalytic activity of 8wt% Ni catalyst is best. The effect of promoters on the catalytic performance is also investigated, it shows that the catalytic performance of 2%La203-added Ni-La catalyst is best. After an 8-hour reaction, it shows that carbon deposition is hardly discovered on catalyst and the loss of Ni is not obvious either. The results of research about bed temperature profile show that in the system of methane, air and water, the hot spot is not evident on Ni-based catalyst bed, POM reaction mainly occurs in the higher part of the bed, but high temperature zone is formed in the lower part of the bed. As the initiation process of POM and the change of Ni value before and after reaction initiation is seldom investigated now, we studied initiation process of POM on Ni-based catalyst and the change of Ni value before and after reaction initiation, as well as the effect of promoter La on the initiation behavior by MS-TPSR technique.