Abstract
The present study investigates a process for the selective production of hydrogen from the catalytic decomposition of formic acid in the presence of iridium and iridium–palladium nanoparticles under various conditions. It was found that a loading of 1 wt.% of 2% palladium in the presence of 1% iridium over activated charcoal led to a 43% conversion of formic acid to hydrogen at room temperature after 4 h. Increasing the temperature to 60 °C led to further decomposition and an improvement in conversion yield to 63%. Dilution of formic acid from 0.5 to 0.2 M improved the decomposition, reaching conversion to 81%. The reported process could potentially be used in commercial applications.
Highlights
Fossil fuels are non-renewable energy sources, as these resources will not last forever, and their supply is declining
The expected growth in global energy consumption must be accompanied by the introduction of carbon-neutral energy generation and carrier systems to reduce modern societies’ environmental footprints and overcome the limitations of fossil fuel resources
We report the successful use of iridium (Ir) and Ir–Pd nanoparticles as catalysts in the decomposition of formic acid (FA) using impregnation and sol-immobilization techniques under various reaction conditions
Summary
Fossil fuels are non-renewable energy sources, as these resources will not last forever, and their supply is declining. A Co0.30Au0.35Pd0.35 nanoalloy supported on carbon has been used as a selective catalyst in the decomposition of FA to produce hydrogen, with a high conversion rate (91%) at room temperature [29]. Such a catalyst is cheap, easy to prepare, and stable, with no CO produced. We report the successful use of iridium (Ir) and Ir–Pd nanoparticles as catalysts in the decomposition of FA using impregnation and sol-immobilization techniques under various reaction conditions Various techniques, such as scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) surface area analysis, and inductively coupled plasma (ICP) were used to characterize the catalysts
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