| Ammonia was synthesized from nitrogen and hydrogen at atmospheric pressure in a solid state proton conducting cell reactor in this paper, which includes two parts: review section and experimental section.In review section, the latest striking developments in the study of high-temperature proton conductors are presented in this paper, a brief overview is given of the types and proton conductivity of high-temperature solid state protonic conductors, and their application, prospects and progress are summarized. Being major subject, high-temperature proton conductors based on pyrochlore-type or fluorite-type oxides are reviewed concerning their structure properties, conductivities, conduction mechanism as well as the study status.The present paper describes basic principles of dominant Harber process and some of the more recent investigations of synthesizing ammonia, with emphasis on the experience and principle of synthesizing ammonia at atmospheric pressure with the use of solid state electrolyte electrochemically. NEMCA effect explains the increase in the rate of NH3 synthesis, which is introduced latter.There are various kinds of methods to prepare complex oxides, sol-gel methods is chose in this paper, the working principles and properties of these method are reviewed.In experimental section, fluorite-type of Ce1-xLnxO2-δ (Ln=La, Y, Gd, Sm), (Ce0.8La0.2)1-xCax02-δ(x=0,0.05), La1.9Ca0.1Ce2O6.95 and pyrochlore-type complex oxides of La1.9Ca0.1Zr2O6.95 as well as La2-αCaαZr2-βCeβO7 -δ(α=0,0.05;P=0,0.2,0.4) were prepared by sol-gel method, and the thermal decomposition was characterized by thermal analysis (TG-DTA), from which the optimum calcination temperature was obtained. The topography was characterized with transmission electron microscopy (TEM) and scanning... |
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