Optical and experimental evaluation of a directly irradiated solar reactor for the catalytic dry reforming of methane
<p dir="ltr">Dry reforming of methane is a process to produce syngas which is a major precursor for many chemicals and ultra-clean fuels. It is a CO<sub>2</sub>-assisted process that leads to the conversion of CO<sub>2</sub> to higher-value products but is als...
محفوظ في:
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| مؤلفون آخرون: | , , |
| منشور في: |
2023
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| الملخص: | <p dir="ltr">Dry reforming of methane is a process to produce syngas which is a major precursor for many chemicals and ultra-clean fuels. It is a CO<sub>2</sub>-assisted process that leads to the conversion of CO<sub>2</sub> to higher-value products but is also a highly endothermic process that requires significant amounts of energy in the form of CO<sub>2</sub> emitting fuels. For these reasons, this study focused on the direct utilization of concentrated solar energy by irradiating the catalyst directly rather than via a heat transfer fluid or conductive heat transfer. In addition, it uniquely adopts a tubular reactor with transparent (quartz) walls configuration, which allows extending the length of the irradiated (hot) zone to control the residence time. The new reactor was designed using Monte-Carlo ray-tracing modeling and evaluated experimentally using a commercial Ni-based catalyst. In brief, the reacting gas mixture (CH<sub>4</sub>:CO<sub>2</sub> − 5 %: 5 %) was fed into the reactor at weight gas hourly space velocities of around 17–58 l h<sup>−1</sup> g<sup>−1</sup> and three different temperature levels (550 °C, 650 °C, and 800 °C). Although the non-conventional mode of heating, the achieved methane conversions (∼93 % at 800 °C to ∼ 53 % at 550 °C) and H<sub>2</sub> / CO ratios (∼0.9 at 800 °C to ∼ 0.4 at 550 °C) were similar to literature studies with the same catalyst. At the same time, the quartz walls showed no degradation after more than 80 h of intermittent testing. On the other hand, the overall energy efficiency was estimated to be less than 1 %, considering the radiation intercepted by the reactor system. However, it rose to 5 % − 25 % when correcting for the actual amount of irradiance on the catalytic bed.</p><h2>Other Information</h2><p dir="ltr">Published in: Chemical Engineering Journal<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.cej.2022.139190" target="_blank">https://dx.doi.org/10.1016/j.cej.2022.139190</a></p> |
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