Anomalous behavior of H2 storage in photocatalytic splitting of water over Fe nanoparticles loaded on Al-modified SBA-15 composites via microwave or ultrasonic treatment routes. (21st September 2020)

• Record Type: Journal Article
• Authors: Gobara, Heba M.; Hassan, Salah A.; El Naggar, Ahmed M.A.; Mohamed, Rasha S.; Alkahlawy, Amal A.; Salem, Ahmed A.; Salem, Heba M.
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 46(2020)
• Page Start: 24710
• Page End: 24725
• Publication Date: 2020-09-21
• Subjects: Photo-catalytic mesoporous composites -- Fe@Al-SBA-15 systems -- H2-storage -- Water splitting -- Microwave-assisted route -- Ultrasonic-assisted route; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.06.223
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Photo-catalytic semiconducting composites were designed and tested in water splitting process for hydrogen generation/storage under visible light irradiation. Iron oxide NPs (5 wt%) were loaded onto Al (25 wt%)-modified SBA-15 supports via microwave-assisted (M) and ultrasonic-assisted (U) routes. Various Al-ِmodification methods of SBA-15 were applied, namely, impregnation post synthesis (Al/S(Imp) ), ultrasonic post synthesis (Al/S(Us) ) and in situ direct synthesis (Al/S(Ins t ) ). Several techniques were adopted to characterize the as-synthesized composites, viz., XRD, XRF, N2 adsorption-desorption, FTIR, TPR, NH3 -TPD, H2 chemisorption, TEM-EDS, DSC-TGA and UV abosorbance. The obtained results showed that all the studied catalysts are rather suitable candidates for H2 storage with maximum capacity, referred probably to the fitting modifications in the pore system and the whole structure of the catalyst samples. The applied loading routes have led to different characteristics of the finished catalytic systems, where the ultrasonic-assisted loading route showed more prevailing behavior in the photo-catalytic splitting process. Highlights: Photocatalytic composites (Al/SBA-15) were modified via differnt approches. Iron oxide nanoparticles (5 wt %) were loaded onto Al (25 wt %) - modified SBA-15. Microwave assisted and ultrasonic assisted techniques were applied as loading routes. The photocatalytic systems were tested in water splitting under visible light irradiation. The designed systems were suitable candidates for H2 storage with maximum capacity.