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Processing and properties of high-purity micro-lamellate (NH)RuCl particles

Green Processing and Synthesis, ISSN: 2191-9550, Vol: 7, Issue: 1, Page: 16-22
2018
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(NH)RuCl is an important precursor in the synthesis of Ru powder with high-purity requirement. In this study, high-purity (>99.999 wt%) micro-sized (NH)RuCl pieces were synthesized by distillation and precipitation from crude Ru powder. Then, the thermal decomposition behavior of the (NH)RuCl pieces was investigated. The decomposition process included two stages. First, (NH)RuCl was decomposed from 255.0°C to 314.0°C, with the endothermic peak located at 309.4°C. At this stage, HCl and NH 3 were released, while the dense micro-pieces were transformed to loosened micro-pieces due to the thermal decomposition. Then, the solid phase [(NH)RuCl] kept decomposing from 314.0°C to 352.7°C, HCl and N2 were released, and agglomerated Ru particles were achieved. Thermogravimetric analysis-differential thermal analysismass spectrum coupling (TG-DTA-MS) was used to monitor the thermal decomposition process and identify the released gaseous phases, respectively. The solid phases in different stages were characterized by higherature X-ray diffraction (HTXRD). A good understanding of the processing and thermal decomposition of (NH)RuCl is crucial in the creation of Ru products.

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