Journal
CATALYSTS
Volume 11, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/catal11030321
Keywords
hydrogen production; NH3 decomposition; optimum Cs; Ru loading; Ru; C catalyst; fixed-bed reactor
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Funding
- Ministry of Science and Technology, Taiwan, R.O.C. [NSC 99-2221-E-239 -026, MOST 110-2622-8-239 -001 -TE5]
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The study on hydrogen production from ammonia decomposition on commercial 5 wt.% Ru/C catalyst revealed that the ammonia conversion increased with increasing Cs/Ru molar ratio and reached a maximum at 4.5. However, the conversion rapidly decreased with further increase in Cs/Ru molar ratio, dropping even below that of pure Ru/C at a ratio of 6. The Cs promotion effect was attributed to hot ring promotion at lower Cs/Ru molar ratios, while the mechanisms for Cs effects on ammonia conversion at higher Cs/Ru molar ratios were discussed. At optimal Cs loading, ammonia conversions at 400°C were near 100% for gas hourly space velocities ranging from 48,257 to 241,287 mL/(h center dot g(cat)).
The hydrogen production from ammonia decomposition on commercial 5 wt.% Ru/C (C: activated carbon) catalyst with different cesium (Cs) loadings at lower temperatures of 325-400 degrees C in the fixed-bed reactor was experimentally investigated. Based on the parameters used in this work, the results showed that the ammonia conversion at 350 degrees C is increased with the increasing Cs/Ru molar ratio, and it reaches its maximum value at the Cs/Ru molar ratio of 4.5. After that, it is rapidly decreased with a further increase of Cs/Ru molar ratio, and it is even smaller than that of the pure Ru/C case at the Cs/Ru molar ratio of 6. The Cs promotion at the lower Cs/Ru molar ratios may be due to the so-called hot ring promotion. The possible mechanisms for Cs effects on the ammonia conversion at higher Cs/Ru molar ratio are discussed. At optimum Cs loading, the results showed that all the ammonia conversions at 400 degrees C are near 100% for the GHSV (gas hourly space velocity) from 48,257 to 241,287 mL/(h center dot g(cat)).
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