Thermally stable Pt/Ti mesh catalyst for catalytic hydrogen combustion. (24th June 2020)

• Record Type: Journal Article
• Authors: du Preez, S.P.; Jones, D.R.; Warwick, M.E.A.; Falch, A.; Sekoai, P.T.; Mota das Neves Quaresma, C.; Bessarabov, D.G.; Dunnill, C.W.
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 33(2020)
• Page Start: 16851
• Page End: 16864
• Publication Date: 2020-06-24
• Subjects: Catalytic hydrogen combustion -- Platinum -- Thin-layer deposition -- Titanium oxides -- Thermal energy; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.04.112
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this study, platinum (Pt) supported on titanium (Ti) mesh catalysts for catalytic hydrogen combustion were prepared by depositing Pt as a thin-layer on metallic or calcined Ti mesh. The Pt thin-layer could be stabilized as uniformly distributed, near nano-sized particles on the surface of calcined Ti mesh by exposing the freshly sputtered Pt to hydrogen. Temperatures between 478 and 525 °C were reached during hydrogen combustion and could be maintained at a hydrogen flow rate of 0.4 normal liter (Nl)/min for several hrs. It was determined that Ti mesh calcination at ≥900 °C formed an oxide layer on the surface of Ti wires, which prevented significant Pt aggregation. X-ray photoelectron spectroscopy revealed that the surface of Ti mesh was fully converted to TiO2 at ≥900 °C. Raman spectroscopy showed that the majority of TiO2 was present in the rutile phase, with some minor contribution from anatase-TiO2 . The calcined Ti support was stable through all investigations and did not indicate any signs of degradation. Highlights: Pt/Ti mesh catalyst were successfully developed for catalytic hydrogen combustion. Pt aggregation was limited/prevented on the surface of calcinated Ti mesh support. Catalyst maintained combustion temperatures of up to 525 °C. Catalytic combustion reaction became spontaneous above 70 °C.