Research Of Supported Ni-based Catalysts For Ammonia Decomposition

The development of new energy sources has become the world generally one of the issues of concern. Non-infectant hydrogen can be used repeatedly. Higher burning value becomes the first choice. Therefore low temperature ammonia decomposition catalyst owns broad prospects.In recent research, the LaNiO3 have a good catalystic activity for ammonia decomposition reaction. In this study we usedγ-Al₂O₃ as the support and studied the effect of the carrier loading perovskite in its surface, on the pretreatment and catalyst production and the impact on the activity of ammonia decomposition reaction. We also dopped Sr on the A bit of the LaNiO3 in order to find the methods and principles of decreasing the reaction temperature of ammonia decomposition. Moreover we used the XRD, TPR and BET characterization analysis to study the redox properties of the catalyst and its structural change before and after ammonia decomposition reaction to work on its catalytic activity.The study found that the carrier by properly pretreating and using the appropriate preparation of sol-gel method, firstly covered the surface of theγ-Al₂O₃ with the LaAlO3, then use the active component of Sol solution impregnated carrier to reduce the interaction between theγ-Al₂O₃ and individual active component,thus that is conducive to the formation of supported perovskite structure. Stepwise analysis by XRD showed that, there was the formation of the complete perovskite structure on the surface of the catalyst, by the method of pretreating theγ-Al₂O₃ with the solution of 0.5mol/L of Al(NO3)3 and 0.5mol/L La(NO3)3 in accordance with the ratio of 1:1, and making by the sol-gel method, significantly it showed the best activity in ammonia decomposition reaction, and made the ammonia completely decompose in the 620℃. Additionally it is also found that through the A-bit Doping with Sr, the catalyst Ammonia decomposition activity did not increase, but reduced, and after the doping, there was not the formation of the La1-XSrXNiO3 on the surface of the catalyst through XRD analysis.