Hydrotalcite framework stabilized ruthenium nanoparticles Ru/HTaL : efficient heterogeneous catalyst for the methanolysis of ammonia-borane

Authors : İsmail Burak BAĞUÇ, Mehmet YURDERİ, Gülşah Saydan KANBEROĞLU, Ahmet BULUT

Pages : 364-377

Doi:10.3906/kim-1910-44

View : 21 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Ruthenium nanoparticles stabilized by a hydrotalcite framework Ru/HTaL were prepared by following a 2-step procedure comprising a wet-impregnation of ruthenium III chloride precatalyst on the surface of HTaL followed by an ammonia-borane NH$_{3}$BH$_{3}$ reduction of precatalyst on the HTaL surface all at room temperature. The characterization of Ru/HTaL was done by using various spectroscopic and visualization methods including ICP-OES, P-XRD, FTIR, $^{11}$B NMR, XPS, BFTEM, and HRTEM. The sum of the results gained from these analyses has revealed the formation of well-dispersed and highly crystalline ruthenium nanoparticles with a mean diameter of 1.27 ± 0.8 nm on HTaL surface. The catalytic performance of Ru/HTaL in terms of activity, selectivity, and stability was investigated in the methanolysis of ammonia-borane NH$_{3}$ BH$_{3}$, AB , which has been considered as one of the most promising chemical hydrogen storage materials. It was found that Ru/HTaL can catalyse methanolysis of AB effectively with an initial turnover frequency TOF value of 392.77 min-$^{-1}$ at conversion >95% even at room temperature. Moreover, the catalytic stability tests of Ru/HTaL in AB methanolysis showed that Ru/HTaL acts as a highly stable and reusable heterogeneous catalyst in this reaction by preserving more than 95% of its initial activity even at the 5th recycle.
Keywords : Ammonia borane, methanolysis, hydrotalcite, ruthenium, nanoparticles