【摘 要】
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Main observation and conclusionrnTransition metal-rare earth oxide catalysts had the ability to catalyze ammonia decomposition according to recent years\' scientific reports.However,most of those catalysts had their own limitations:the catalytic activit
【机 构】
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Key Laboratory for Colloid and Interface Chemistry,Key Laboratory of Special Aggregated Materials,Sc
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Main observation and conclusionrnTransition metal-rare earth oxide catalysts had the ability to catalyze ammonia decomposition according to recent years\' scientific reports.However,most of those catalysts had their own limitations:the catalytic activity was poor,and/or the active species could not clearly be identified.Here we report the CoaSmbOx catalysts with good dispersion,controllable content,and excellent catalytic performance for ammonia decomposition.The various content catalysts were synthesized by aerosol-assisted self-assembly ap-proach.These catalysts had high dispersion and great morphology according to the images of the transmission electron microscope(TEM) and the scanning electron microscope (SEM).The temperature-programmed reduction by hydrogen (H2-TPR) and in-situ X-ray diffraction (XRD) results indicated that the interaction between cobalt oxide and samarium oxide influenced the redox properties of cobalt oxide.Combined with in-situ Raman,we found that Co0 was an active species of the CoaSmbOx catalysts in ammonia decompo-sition.Moreover,the temperature-programmed desorption of NH3 (NH3-TPD) data illustrated that the addition of Sm was beneficial to the adsorption of NH3.In general,we successfully obtained the CoaSmbOx catalyst with high activity and good stability.More im-portantly,we have identified the structure-function relationship of catalysts by exploring the active species in the reaction process.
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