Porous membrane catalysts with Pd-M-clusters for liquid phase hydrogenation of dehydrolinalool

Structured catalyst of Pd/ZnO on sintered metal fibers for 2-methyl-3-butyn-2-ol selective hydrogenation

“…2 and 3). After 3 runs, the catalyst was regenerated by the calcinationreduction procedure (see Section 2.5), which in some cases is known to restore the initial catalytic performance of Pd catalysts in hydrogenation reactions [9]. However, the regeneration did not improve the selectivity significantly ( Table 2, No.…”

“…The MBY hydrogenation reaction is structure-sensitive; Pd/Al 2 O 3 catalyst with monodispersed 2.5-nm particles showed sixfold lower activity and lower selectivity (75 vs 89%) compared with Pd/Al 2 O 3 containing monodispersed 7.5-nm particles [31]. The performance of Pd catalyst in alkynol hydrogenation is strongly influenced not only by the Pd dispersion [31,32], but also by the nature of the support [28,33], the promoters to active metals [3,9,[34][35][36][37][38][39][40][41][42][43][44], and use of additives [7,[45][46][47][48]. For MBY hydrogenation in ethanol as solvent, selectivity to MBE has been found to increase in the following order: Pd black < Pd/C < Pd/Al 2 O 3 < Pd/BaSO 4 < Pd/MgO < Pd/ZnO ∼ = Pd/CaCO 3 [33].…”

“…Palladium catalysts based on monoliths [7,8], H 2 -permeable membranes [9,10], metallic grids [11,12], and bidimensional glass [13] and carbon [14,15] fabrics have shown high selectivity to alkenes in liquid-phase hydrogenation. The disadvantages of these structured catalysts are low surface area, low reactor space-time yield, high fabrication costs, or low mechanical strength.…”

“…Over the last decade, structured catalysts have attracted increasing attention for three-phase reactions [4][5][6][7][8][9][10][11][12][13][14][15]. Palladium catalysts based on monoliths [7,8], H 2 -permeable membranes [9,10], metallic grids [11,12], and bidimensional glass [13] and carbon [14,15] fabrics have shown high selectivity to alkenes in liquid-phase hydrogenation.…”

Shape-controlled preparation and catalytic activity of metal nanoparticles for hydrogenation of 2-butyne-1,4-diol and styrene oxide

“…The lower activity of Pd colloids for dehydrolinalool hydrogenation may be due to the different method of colloid stabilization, which affects the access of reactants to the active metal sites, and partly due to the atmospheric conditions under which the hydrogenation reaction was carried out. Hydrogenation of dehydrolinalool was also studied by Karavanov et al [25] using Pd clusters on a membrane, however the selectivity to olefinic product (linalool) was only 80%. TOF as high as 1 × 10 4 , has been reported for polymer-supported functionalized Pd nanoparticles in the hydrogenation of 9-decene-1-ol at atmospheric conditions [26]; while for benzene and phenylacetylene hydrogenation [27].…”