Effects Of Catalyst Composition And The Type On Ammonia Decomposition Activity

With the development of society, 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. High-purity of hydrogen would be the advantages, which applied in low-temperature decomposition of ammonia was a new way in industry.Therefore low temperature ammonia decomposition catalyst owns broad prospects.The thesis LaBO₃(B=Ni,Co,Fe,Mn)catalysts,La_1-XSr_XNiO₃(X=0,0.1,0.2,0.3)catalysts and supported nickel-based catalyst for assessment, to achieve 100% rate of ammonia decomposition temperature of the research targets, combined XRD, TPR and XPS characterization analysis of the redox properties of the catalyst and ammonia decomposition reaction before and after the changes in the composition catalyst its impact.Study found:LaBO₃ in the process of decomposition reaction generated free metallic quality single catalytic ammonia decomposition is a key factor and the most vulnerable to disintegration LaNiO3 generation Ni free state, the formation of Ni La2O3 can stop the sintering, LaNiO3 makes good catalyst activity. La_1-XSr_XNiO₃, corresponding to the oxygen species ability to respond to strong, promote the decomposition of the catalysts, while increasing the surface of the catalyst La/Ni ratio of Ni to improve the dispersion, so that the quality of production of single-Ni smaller particle size, surface area to expand, thereby increasing the activity of the catalyst. Ammonia can be made at 600℃can degrade completely.In a solid phase precipitates prepared with the NiO/La2O3 catalyst prepared by impregnating other vector commonly used in industry Supported nickel-based catalyst comparison found that the use of solid-phase precipitation, the enhancement of the catalyst on the dispersion of Ni, thereby making the catalytic activity has been markedly enhanced.