Effect of hydrogen spillover in decalin dehydrogenation over supported Pt catalysts
One weight percent Pt impregnated on activated carbon (Pt/AC) and alumina supports (Pt/Al2O3) have been tested for decalin dehydrogenation for the production of clean H2. CO pulse chemisorption results indicate nearly same Pt dispersion in both Pt/AC and Pt/Al2O3 catalysts. The comparison of activity between Pt/AC and Pt/Al2O3 catalysts revealed superior decalin dehydrogenation activity over Pt/AC both in terms of turn over frequency as well as the yield towards H2 production which is due to the spill over of H2 on Pt/AC. The Pt dispersion in Pt/Al2O3 is lost due to the phase transformation of support (boehmite phase of alumina to γ phase) during reduction treatment and this is the main reason for the loss of decalin dehydrogenation activity. It is concluded that spill over hydrogen is also an important aspect in addition to Pt dispersion for getting higher H2 yield from decalin dehydrogenation.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (67 K)Download as PowerPoint slideHighlights► Decalin dehydrogenation over Pt supported catalyst. ► Superior activity of “Pt/C” over “Pt/Al2O3” catalyst due to hydrogen spillover. ► Phase transformation of alumina boehmite phase of alumina to γ or δ phase.
Journal: Applied Catalysis A: General - Volumes 425–426, 28 May 2012, Pages 62–67