Photocatalytic hydrogen production using TiO₂-Pt aerogels

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• 作者：Jarmila Puskelova ; Lucian Baia ; Adriana Vulpoi ; Monica Baia ; Maria Antoniadou ; Vassilios Dracopoulos ; Elias Stathatos ; Kovacs Gabor ; Zsolt Pap ; Virginia Danciu ; Panagiotis Lianos
• 关键词：TiO2&ndash ; Pt ; Aerogels ; Photocatalytic hydrogen production ; Ethanol reforming
• 刊名：Chemical Engineering Journal
• 出版年：15 April, 2014
• 年：2014
• 卷：242
• 期：Complete
• 页码：96-101
• 全文大小：1792 K

文摘

TiO₂-Pt aerogel composites have been synthesized by mixing sol-gel titania with Pt colloidal suspensions followed by supercritical drying. The highest specific surface achieved with these materials ranged between 550 and 600 m² g^鈭? before annealing and stayed relatively high, i.e. 162 m² g^鈭?, after calcination. The concentration of Pt nanoparticles ranged between 0.3 and 1.0 wt.% while their size ranged between 5.75 and 6.5 nm. These composites were employed as photocatalysts for room-temperature photocatalytic reforming of ethanol and hydrogen production. The highest hydrogen production rate, 7.2 mmol H₂ h^鈭? g^鈭?, was obtained in the case of the smallest and most concentrated metal nanoparticles underlying the importance of the number of active sites on the TiO₂-Pt composites. This rate of hydrogen production is relatively high and reflects the relatively high specific surface of the employed photocatalysts.