Study On Preparation And Properties Of Red Mud Based Catalyst For Methane Decomposition

Red mud is the waste of alumina industry,which contains many kinds of metal minerals.Red mud itself has a strong alkaline,the dam stockpiling method not only caused a waste of land resources and valuable metal resources,but also caused the damage to the natural environment and human health.The comprehensive resources utilization of red mud has become an significantly problem to be solved in aluminum smelting industry.In this paper,we have modified the red mud through the acid alkali dissolution and precipitation method,a nano-mesoporous materials modified red mud have been prepared with an uniform particle sizes,the activity and atability of MRM for catalytic methane decomposition?CMD?was higher compared to red mud,the most highest methane conversion rate obtained over MRM was 1.55×10-5 mol CH₄/gcat·s.And more.MRM has been used as a supporter for preparing the xFe/MRM-R and xNi/MRM-R catalysts by co-precipitation method.The performance of xFe/MRM-R and xNi/MRM-R catalysts for CMD was further improved compared to MRM,and the hydrogen production by CMD under mild conditions was realized.The highest CH₄ conversion methane conversion rate obtained over 40Fe/MRM was 41.5×10-6 mol CH₄/gcat·s under the temperature of 650?,the highest CH₄ conversion rate obtained over 50Ni/MRM-R was 7.62×10-6 mol CH₄/gcat·s under the condition of 600?.The mechanism of activity and stability of xNi/MRM-R catalyst which influenced by the loading amount of active metal,reaction temperature and space velocity of CH₄ was also studied,respectively.The results found: the type of carbon deposits generated during CMD not only controlled by the reaction conditions,but also relate to the movement speed of carbon atoms when its dissolved and diffusion in the body of carbon-active metal particles.If the carbon atoms movement speed is greater than the speed of the carbon atoms deposite on the surface of metal particles,the carbon nanotubes growth will continue,and the catalyst particles will maintain its catalytic activity.