Catalytic Ammonia Decomposition Over Ruthenium Nanoparticles Supported on Nano-Titanates

Abstract

Nanosized Na 2 Ti 3 O 7 , K 2 Ti 6 O 13 and Cs 2 Ti 6 O 13 materials were prepared and used as supports of ruthenium nanoparticles for catalytic ammonia decomposition. It is shown that these catalysts exhibit higher catalytic activity than ruthenium supported on TiO 2 nanoparticles promoted with cesium. The difference is attributed to the use of nanostructured materials with incorporated alkali metals in the crystal lattice, which apparently gives a higher effect of the promoter. All samples were characterized by X-ray powder diffraction, transmission electron microscopy and N 2 physisorption measurements. Furthermore, the effect of ruthenium loading on the catalytic decomposition of ammonia was investigated.

Low temperature H2 production from ammonia using ruthenium-based catalysts: Synergetic effect of promoter and support

“…The only few previous studies of low temperature ammonia decomposition in the literature [8,9] suggest the feasibility of the system using ruthenium-based catalysts and their catalytic enhancement by the use of electron donating promoters such as cesium or potassium. We have recently demonstrated that optimization of the Ru/Cs ratio on Ru/CNT systems facilitates the production of hydrogen from ammonia at low temperatures.…”

In-situ H2 production via low temperature decomposition of ammonia: Insights into the role of cesium as a promoter

“…To date, only a few scattered studies have investigated the decomposition of ammonia at temperatures below 670 K. Klerke et al [19] found that ruthenium nanoparticles supported on cesium-titanate nanowires become active at 593 K due to the high electron donating character of the super-basic support. Even lower temperature reactivity was observed by Sorensen et al [20] in a microreactor using ruthenium nanoparticles supported on graphitic carbon with a high loading of cesium promoter.…”

Noble metal/silica “raspberry” type hybrids: Synthesis and functionalization

“…Ru is an important noble metal and Ru NPs show catalytic activity in number of important reactions, like CO oxidation [22], oxidation of alcohol in fuel cells [23], ammonia decomposition [24], etc. Ru, in combination with other metals, has also been used as sensor for various chemicals [25,26].…”