Effect of reduction temperature on Ru–Ir/ZnO catalyst for selective hydrogenation of crotonaldehyde

Effective NbOx-Modified Ir/SiO2 Catalyst for Selective Gas-Phase Hydrogenation of Crotonaldehyde to Crotyl Alcohol

“…Noble metals have hydrogenation activity, and various kinds of noble metals have been applied to the selective hydrogenation of unsaturated aldehydes in the gas phase. Ptbased catalysts such as Pt/Ga 2 O 3 , Pt/CeO 2 , and Pt-Sn/ SiO 2 14−16 and Ru-based catalysts such as Ru/ZnO, 17 Ru-Ir/ ZnO, 18 and so on 19 were reported. It should be noted that Ir metal is more effective component than other noble metals on the basis of the previous reports such as Ir/Ga 2 O 3 , Ir-FeO x / SiO 2 , Ir-CrO x /SiO 2 , and so on.…”

“…Noble metals have hydrogenation activity, and various kinds of noble metals have been applied to the selective hydrogenation of unsaturated aldehydes in the gas phase. Pt-based catalysts such as Pt/Ga 2 O 3 , Pt/CeO 2 , and Pt-Sn/SiO 2 − and Ru-based catalysts such as Ru/ZnO, Ru-Ir/ZnO, and so on were reported. It should be noted that Ir metal is more effective component than other noble metals on the basis of the previous reports such as Ir/Ga 2 O 3 , Ir-FeO x /SiO 2 , Ir-CrO x /SiO 2 , and so on. − Various kinds of catalysts were proposed and developed; however, high-yield synthesis of crotyl alcohol in gas-phase reaction seems to be difficult in comparison with the liquid-phase reaction, and the reported highest yield was 81%, which was obtained by using bimetallic Ru-Ir/ZnO catalyst (Table S1).…”

Platinum nanocrystals supported on CoAl mixed metal oxide nanosheets derived from layered double hydroxides as catalysts for selective hydrogenation of cinnamaldehyde

“…In the catalytic process, the undesirable product HCAL would largely be formed, decreasing the selectivity to the unsaturated alcohol. Over the past few years, common noble metal (Pd, Pt, Ru, and Au)-based catalysts have been used for the hydrogenation of CAL [5][6][7]. Unfortunately, only a few catalysts are suitable for the purpose of C@O hydrogenation; most of these are Pt-based catalysts.…”

Biomass‐Derived N‐doped Carbon Materials with Silica‐Supported Ultrasmall ZnO Nanoparticles: Robust Catalysts for the Green Synthesis of Benzimidazoles

“…Obviously, the peak area of ZnO/SiO 2 -NC-600 was significantly larger than ZnO/SiO 2 -1 andZ nO/SiO 2 -2, thus indicating that more active sites were exposed on the surface of ZnO/SiO 2 -NC-600 and enhancing its reactivity.F urthermore, all the samples showedt wo desorption peaks at 155 and 368 8C, which indicates that weak and moderately strong acidic sites were presenta nd could be attributed to the presence of ZnO nanoparticles. [28] Notably,adesorption peak at 381 8Cw as observed for ZnO/SiO 2 -NC-600, thus suggesting that strongly acidic sites exist. In contrast, ZnO/SiO 2 -1 andZ nO/SiO 2 -2 had no such desorption peak.…”