Hydrogenation of Crotonaldehyde over Sn/Pt(111) Alloy Model Catalysts

Chemoselective hydrogenation of carbonyl compounds over heterogeneous catalysts

“…Additionally, geometrical effects, like a change in metal dispersion [15,57], decoration of the main metal by the second metal via surface enrichment [58,61,102] and organic fragments in the vicinity of an active metal [29,58], have been observed in bimetallic catalysts. It is important to note that these effects are often coexistent in bimetallic catalysts and thus one effect, like for instance alloy formation in a model catalyst Sn/ Pt(1 1 1), is not alone responsible for improved selectivity [107], because nearly the same selectivities to crotyl alcohol were obtained over non-supported Pt and Pt-Sn model catalysts. Increased selectivities to crotyl alcohol were, however, obtained over supported Pt-Sn catalyst [107].…”

“…It is important to note that these effects are often coexistent in bimetallic catalysts and thus one effect, like for instance alloy formation in a model catalyst Sn/ Pt(1 1 1), is not alone responsible for improved selectivity [107], because nearly the same selectivities to crotyl alcohol were obtained over non-supported Pt and Pt-Sn model catalysts. Increased selectivities to crotyl alcohol were, however, obtained over supported Pt-Sn catalyst [107].…”

Promotion effect in Pt–ZnO catalysts for selective hydrogenation of crotonaldehyde to crotyl alcohol: A structural investigation

“…For the platinum-based bimetallic catalysts, some electropositive metals, such as Fe, Sn, Zn, Ni and Co, etc., have prominent promotion effects [6][7][8][9][10][11][12][13]. For example, Pt 80 Fe 20 alloy was reported to enhance the activity and the selectivity of carbonyl bond hydrogenation on its (111) surface.…”

“…Surface Fe was ascribed to have the effect of weakening the C=O bond by a specific ion interacting with the O atom [6]. Pt-Sn catalysts on various supports have been extensively studied [7][8][9][10]. Oxidised Sn species were suggested to benefit the hydrogenation of the carbonyl bond.…”

Catalytic behavior of supported Pd catalysts in the selective hydrogenation of campholenic aldehyde to naturanol

“…In order to clarify better the promoter effect of tin, addition of Sn on Pd/Fe 2 O 3 was investigated. Fe 2 O 3 is a reducible support used to promote noble metal catalysts in the selective hydrogenation of the -C=O group in the presence of -C=C-bond [13]. Indeed, Pd/F is quite selective towards unsaturated alcohols (46% selectivity at 50% conversion).…”