Study Of Syngas Methanation Based On J-103H Catalyst

Based on the J-103H catalyst, the methanation of syngas has been studyed. The research contents include:the methanation reaction characteristic under high CO concentra-tion condition, the effects of different conditions on methanation reaction, the factors of the catalyst deactivation, the intrinsic kinetics under the right condition.The results indicate that the syngas methanation are affected by temperature, pressure, space velocity, carbon monoxide concentration, water vapour and CH4. The formation rate of CH4 increases with operating temperature, operating pressure, and CO concentration under certain conditions (temperature 300-500℃, CO concentration of 5-20%).But the concentra-tion of CO can not be excessive, because carbon deposition reaction occurs when concentration of CO exceeds 25%. Water vapour can suppress the methanation reaction and promote the shift reaction, however water vapour can inhibit the carbon deposition reaction. CH4 promotes the decomposition reaction which is the main cause of catalyst deactivation.The investigation results of carbon deposition show that carbon is mainly from CO disproportionation and decomposition of CH4. Carbon deposition have two types:the carbide and graphite which is the main cause. Though the modified catalyst has a superior ability to resist the carbon deposition, it promotes side effects and reduces the selectivity of CH4.Hyperbolic dynamics model is chosen for intrinsic kinetics. Through fitting and model testing, the modle is very good response to methanation characteristics, so it can be used for the numerical calculation of the methanation reaction.