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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
Published on: July 18, 2017
Bimetallic Rh/Ir-Cu Metastable Nanoalloys as Promising Catalysts for Propane Prereforming
Varvara Sinitsa1, Artem Urlukov2,3, Evgeny Filatov1
1Nikolaev Institute of Inorganic Chemistry SB RAS, 3, Acad. Lavrentiev Ave., Novosibirsk 630090, Russia.
None:
In the present work, we synthesized and characterized new complex compounds, [Rh(NH3)5Cl][Cu(H2O)(C2O4)2], [Ir(NH3)5Cl][Cu(H2O)(C2O4)2], and [RhxIr1-x(NH3)6]2[Cu(H2O)(C2O4)2]2[Cu(H2O)2(C2O4)2]·2H2O (x = 0, 0.25, 0.50, 0.75, 1). A detailed study of their thermal decomposition using ex situ and in situ PXRD allowed us to select the optimal conditions and synthesize a series of MxCu1-x (M = Rh, Ir) metastable nanoalloys. For the first time, single-phase metastable Ir0.50Cu0.50 and Ir0.40Cu0.60 nanoalloys were obtained. Nanoalloys were studied in the propane steam reforming reaction (prereforming) at WHSV = 4 000 mL·gcat-1·h-1, T = 300-500 °C, and p = 1 atm. The bimetallic Rh-Cu/Ce0.75Zr0.25O2 supported catalysts demonstrated high activity as well as greater hydrogen selectivity compared to the monometallic Rh sample, resulting in higher hydrogen productivity. Higher hydrogen productivity is achieved due to higher dispersion of the active component in bimetallic catalysts and due to inhibition of carbon monoxide methanation reactions in the overall rate of the steam reforming process.
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