High pressure ammonia decomposition on Ru-K/CaO catalysts

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High pressure ammonia decomposition on Ru-K/CaO catalysts

机译：高压氨分解Ru-K /曹催化剂

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Potassium-promoted ruthenium supported on CaO is a very efficient catalyst for ammonia decomposition, surpassing the performance of other Ru-supported solids. At an optimum Ru loading of 3% wt, catalysts with a K/Ru atomic ratio of 0.9 showed the best catalytic performance under a wide range of operating conditions,P= 1-40 bar,T= 250-550 degrees C and WHSV = 9000-30 000 mL g(-1)h(-1). Although NH(3)conversion levels decrease considerably upon increasing the reaction pressure (X-550 degrees C,X- 40 bar= 0.8), high pressure ammonia decomposition offers the possibility of COx-free compressed hydrogen and hydrogen productivities and TOFs 40 times bigger than when applying atmospheric pressure. Extensive characterization by CO chemisorption and HR-TEM demonstrates that potassium promotion increases metal dispersion by decreasing the Ru particle size. Electronic effects derived from the close proximity between K and Ru result in a decrease in the reaction apparent activation energy, as shown by a detailed kinetic analysis.

机译：Potassium-promoted钌在曹是一个支持非常高效的催化剂氨分解,超过的性能其他Ru-supported固体。wt加载3%,催化剂与K /俄文原子0.9的比率显示最好的催化广泛的操作条件下的性能第1 - 40条件下,P =酒吧,T = 250 - 550摄氏度WHSV = 9000 - 30 g (1) h 000毫升(1)。NH(3)转换水平显著降低提高反应压力(x - 550度C、X - 40条= 0.8),高压氨分解提供COx-free的可能性压缩氢气和氢生产力应用时,TOFs 40倍大气压力。有限公司化学吸收作用和HR-TEM证明钾促进增加金属分散减少了俄文粒子大小。来自之间近距离的影响K和俄文导致减少的反应表观活化能,如图所示详细的动力学分析。

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《Catalysis science & technology》 |2020年第15期|5027-5035|共9页
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正文语种英语
中图分类汉语教学;
关键词
Activation energy; calcium oxide; high pressureCatalystsdecompositionParticle SizeRutheniumDynamic analysisammonia;

机译：活化能;钙氧化物;高pressureCatalystsdecompositionParticleSizeRutheniumDynamic analysisammonia;

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High pressure ammonia decomposition on Ru-K/CaO catalysts

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