Sonochemical Syntheses of a Hetero Metal–Organic Complex, a Precursor for Producing Clean Energy Source of Hydrogen
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In the present study, a hetero nuclear complex formulated as [Cu(H2O)5Ni(dipic)2]·2H2O (1) that dipic is pyridine-2,6-dicarboxylic acid, was synthesized by a sonochemical process and characterized by several techniques such as elemental analysis, atomic absorption spectroscopy, conductivity measurement, Fourier transform infrared spectroscopy, ultra violet–visible spectroscopy, thermal decomposition and single crystal X-ray diffraction. Complex 1 was dispersed on the rutile (R-TiO2) as support and after thermal decomposition, catalyst of Cu–Ni/(R-TiO2) (2) was prepared. Nano-catalyst of 2 was studied by scanning electron microscopy, Brunauer–Emmett–Teller, transmission electron microscopy and powder X-ray diffraction. Catalyst 2 was applied as a catalyst in the water–gas shift reaction in the temperature range of 150–350 °C. In addition, catalyst of 2 was synthesized by co-precipitation and impregnation methods as references catalyst. The results showed that the catalyst of 2, synthesized by thermal decomposition of complex 1, has the highest catalytic performance compared to reference catalysts. Moreover, the results confirmed that the temperature of 250 °C is the optimal temperature for all catalysts. In another section of this study, the performance of anatase and rutile supported Cu–Ni/(R-TiO2) and Cu–Ni/(A-TiO2) catalysts prepared through calcination of 1 were compared for the amount of hydrogen produced. Stability test performed on catalyst of 2 at optimum temperature (250 °C) showed that all catalysts are stable for 12 h.
KeywordsWater–gas shift reaction Inorganic complex Thermal decomposition Catalytic performance Nano-catalyst
I’m grateful to the University of Zabol for financial support.
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