UV-Laser ablation enhanced Joule-heating catalyst support for electrified MSR in microreactor.

[Display omitted] • UV-Laser ablation enhanced Joule-heating catalyst support used in MSR microreactor as internal heat source is proposed. • Methanol conversion rate is improved from 70.52 % to 91.45 % with energy density input of only 2 W/cm3. • Reforming efficiency of 51.91% is obtained without any waste heat recovery measures. • Mechanism of radial temperature gradient in microreactor eliminated by JHCS is revealed. Methanol is a promising hydrogen carrier, where hydrogen-rich gas can be produced by methanol steam reforming (MSR). However, this method of releasing hydrogen is highly energy consuming. Herein, the Joule-heating catalyst support (JHCS) was fabricated by a FeCrAl metal to enhance the efficiency of electrification, replacing the conventional external heating method. The heat can be provided for the reforming reaction directly inside the microreactor by the Joule-heating method. The Joule-heating reactor showed a faster thermal response than the externally heated reactor; the start-up heating time and the time of a start-stop cycle are about 75 % and 50 % of those for external heating, respectively. The methanol conversion rate of the Joule-heating microreactor was 91.45 % at 280 °C, improved by nearly 30 % than the external heating counterpart. The consumed power density of the Joule-heating microreactor was 2 W/cm3, only 15.8 % of external heating (12.61 W/cm3). The reforming efficiency reached 51.91 % without any waste heat recovery measures, about 4 times of the external heating method. Heat transfer simulation verified the minimal radial temperature gradient in the microreactor eliminated by JHCS. The proposed JHCS method demonstrates a uniform microreactor temperature distribution and superior hydrogen production performance with lower power consumption. [ABSTRACT FROM AUTHOR]