Abstract
The enhancement of catalyst coating performance is significantly influenced by the microstructures on the surface of catalyst supports.This study explores the fabrication of ridged microstructures on the surface of the FeCrAl porous metal,which serves as electrified catalyst support for methanol steam reforming(MSR),using ultraviolet(UV)-laser micromilling technology.The formation mechanism of these ridged microstructures was thoroughly analyzed.Surface morphology under different laser processing parameters was examined using scanning electron microscopy(SEM).Surface oxygen context and roughness were measured with energy-dispersive X-ray spectroscopy and a 3D laser confocal microscope,respectively.Contact angles of the microstructures under different laser conditions were observed using a contact angle measuring instrument.After laser pro-cessing,the porous metal supports were loaded with catalysts,and the performance of these catalyst coatings was tested using ultrasonic vibration tests.SEM observations highlighted improved uniformity of the catalyst coating on the support after laser processing.Experimental results showed that supports processed with UV lasers exhibited better hydrophilicity,with contact angles mostly less than 90°,facilitating better diffusion and adhesion of the catalyst solution.Optimal catalyst coating per-formance on FeCrAl porous metal support with ridge microstructure surface was achieved with laser processing parameters set at 200 mm/s speed,40 kHz frequency,and 5 scans.The optimal microstructure surface demonstrated a load mass of approximately 0.5 g and a catalyst coating strength of 87.72％.This represents approximately 17 times and 10 times the performance of unprocessed surfaces,respectively,after 8 min of ultrasonic vibration.
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