Hydrogen production via catalytic decomposition of NH3 using promoted MgO-supported ruthenium catalysts

Catalytic decomposition of NH_3 to high purity hydrogen offers a promising strategy for fuel cells, but presents challenges for high hydrogen yields at comparatively low temperatures due to the lack of efficient catalysts. Here, we report the facile preparation of ultra-fine ruthenium(Ru) species dispersed on Mg O, which show excellent activity and high temperature stability for NH_3 decomposition reaction. The hydrogen yield of the prepared Ru/Mg O catalysts reaches ca. 2,092 mmol H_2 g~(–1) Ru min~(–1) at450 °C, far exceeding that of the previously reported most reactive Ru-based catalysts and the same chemical composition samples prepared by other approaches. Various characterization techniques containing X-ray absorption fine structure(XAFS),in-situ diffuse reflectance infrared Fourier transform spectroscopy(in-situ DRTFTS) and temperature-programmed reduction/desorption(TPR/TPD) were carried out to explore the structure-function relation of the prepared Ru/Mg O catalysts. We found that the Ru species interact strongly with the Mg O support, which can efficiently protect the Ru species and Mg O support from agglomerating during NH_3 decomposition test, maintaining the stability of the catalysts.     

Simulation of stripping injection into HITFiL with carbon ion

Stripping injection is one of the crucial stages in the accumulation process of the hadron therapy synchrotron HITFiL(Heavy Ion Therapy Facility in Lanzhou).In order to simulate the stripping injection process of carbon ions for HITFiL,the interactions between carbon ions and foil has been studied,and simulated with a code developed by ourselves.The optimized parameters of the injecting beam and the scheme of the injection system have been presented for HITFiL.