Compared to the traditional electrode catalysts, the recently developed catalyst has more than twice the conversion efficiency from methane to hydrogen.
The development is also expected to contribute significantly to the development of many waste-to-energy conversion technologies.
A team of researchers supervised by Prof. Gun-Tae Kim from the School of Energy and Chemical Engineering at UNIST has succeeded in developing quite the technique to improve catalysts’ stability and performance, utilized in the reaction that produces carbon monoxide and hydrogen from known greenhouse gases.
“The uniform and quantitatively controlled layer of iron (Fe) via atomic layer deposition (ALD) facilitates the topotactic exsolution, increasing finely dispersed nanoparticles.”
The team also established that exsolution is improved even with a tiny amount of ALD-accumulated Fe oxide. For instance, at 20 cycles of Fe oxide deposition via ALD, the particle group gets over 400 particles. And, as these particles comprise Fe and Ni, they also showed high catalytic behavior.
The recent catalyst displayed high catalytic behavior for the DRM process, with no noticeable degeneration in performance for over 400 hours of non-stop running.
The team found, as well, a high methane conversion, more than 70 % at 700 degrees C. Such a thing is more than double the power conversion efficiency that of the previous electrode catalysts.
According to researchers, the abundant alloy nanocatalysts via ALD represent a significant step forward in the development of exsolution and its relevance to the field of energy use.
The traditional catalysts utilized for the dry reforming of methane are nickel-based metal complexes. However, in time, the performance of catalysts and the catalyst lifetime decayed. A reason is believed to be how carbon accumulates on the catalysts’ surface as they bump together.
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Greenhouse gas, Hydrogen, Methane, Catalysis, Carbon dioxide reforming, Chemistry
World news – US – A New Nanocatalyst Can Turn the Greenhouse Gas into Hydrogen