Nitrogen-Containing Carbon Nanotubes as an Effective Support for the Synthesis of Stable Single Atom Metal Catalysts
O. YU. PODYACHEVA1, Z. R. ISMAGILOV1,2
1Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2Federal Research Center of Coal and Coal Chemistry, Siberian Branch of the Russian Academy of Sciences, Kemerovo, Russia
Keywords: nitrogen-containing carbon nanotubes, single atom metal catalyst, platinum, palladium, formic acid, hydrogen
Abstract
The possibility of using nitrogen-containing carbon nanotubes (N-CNTs) as a support for the synthesis of single atom palladium and platinum catalysts has been studied. The influence of metal content (0.2-2 wt%) and synthesis method (impregnation and deposition) on the dispersion of supported Pd and Pt was studied. The requirements for preparation of a 100 % single atom catalyst have been determined (use of a metal precursor in cationic form and a metal content of less than 0.5 wt%). It was established that the turnover frequency of the gas-phase formic acid decomposition reaction for hydrogen production increases by 4 times on single metal atoms stabilised on the pyridinic nitrogen centres of the N-CNTs, compared to nanoparticles with a size of ~1 nm. Single atom metal catalysts exhibit higher selectivity to hydrogen and make it possible to decrease the concentration of carbon monoxide by more than 2 times. The stability of Pd and Pt atomic species in the course of the reaction occurring at elevated temperatures has been established.
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