Synthesis of bimetallic SnPt-nanoparticle catalysts for chemoselective hydrogenation of crotonaldehyde: Relationship between Sn x Pt y alloy phase and catalytic performance

Effects of Sn<i>_x</i>Pt<i>_y</i> Alloy Structures on the Performance of SnPt Catalysts for the Selective Hydrogenation of Unsaturated Aldehydes to Unsaturated Alcohols

“…The relationship between the SnxPty alloy composition of the obtained catalysts and their activity for crotonaldehyde hydrogenation was also studied, with the key findings summarized below. Scheme 3 Suggested Mechanism of Crotonaldehyde Hydrogenation over SnPt _ NP Catalysts with Various Sn/Pt Atomic Ratios 24) (1) The maximum UOL selectivity observed over Sn/Pt/ SiO2 catalysts prepared by successive impregnation exceeded that observed over Sn _ Pt/SiO2 catalysts prepared by co-impregnation. At the same Sn/Pt atomic ratio, the impregnation method affected the formation of SnxPty alloys, and thus the catalytic performance for selective crotonaldehyde hydrogenation.…”

“…4 (b)) and demonstrating the coexistence of Sn1Pt3 and Sn1Pt1 at Sn/Pt 0.5 ( The diffraction patterns were recorded at a scanning speed of 0.5°/ min. (e), and 2.0 (f) 24) whereas the intensity of the Sn1Pt1 peaks increased up to Sn/Pt 1.5 (Figs. 2 (c)-(g)), decreasing with higher Sn content at higher Sn/Pt ratios ( Fig.…”

“…The presence of various Sn sites on SnPt catalysts makes it difficult to elucidate the specific sites responsible for the selective formation of unsaturated alcohols. To exclude the metal-support interaction during catalyst preparation, unsupported SnPt _ NP catalysts were prepared using a polyalcohol reduction method 24) .…”

“…The present study describes the hydrogenation of crotonaldehyde over SiO2-supported SnPt catalysts prepared by co-impregnation 24) and successive impregnation 25) , and over SnPt nanoparticles (SnPt _ NPs) synthesized by a polyalcohol reduction method 24) . The bulk structures of SnPt catalysts were analyzed by X-ray diffraction (XRD) to identify the most effective SnPt structure and composition.…”

“…4 (c)-(g)),Fig. 1 Effect of the Sn/Pt Atomic Ratio of Sn _ Pt/SiO 2 CatalystsPrepared by Co-impregnation on (a) Conversion and (b) Product Formation Selectivity during Crotonaldehyde Hydrogenation24)…”