The kinetics of citral hydrogenation over Pd supported on clinoptilolite rich natural zeolite

Microwave‐Assisted Chemoselective Hydrogenation Reactions Incorporating Hydrogen as Reducing Agent

“…The influence of metal, support material, solvent, or reaction parameters (temperature, pressure) on product yield, selectivity, and product distribution can be obtained and investigated. Furthermore, the hydrogenation of 1 gives access to important intermediate products for flavors and fragrances, such as citronellal (1a) or citronellol [28]. The a,b-unsaturated carbonyl compound 1 includes three functional units that can be hydrogenated: (i) a carbonyl group, (ii) a conjugated C-C double bond, and (iii) an isolated C-C double bond (Scheme 1).…”

Zeolites as Catalysts for the Synthesis of Fine Chemicals

“…Recently, Yilmaz et al [109] used Beta zeolites with different Si/Al ratios incorporating B, Ti, or V atoms as catalysts for the liquid-phase isomerization of α-pinene at 273 • C. H-Beta zeolites (Si/Al = 27-33) exhibited high catalytic activity, with selectivity to camphene and terpinenes close to 27.5 and 13%, respectively, while samples with boron, titanium, or vanadium presented insignificant catalytic activity. Gunduz et al [110,111] working at the same temperature also reported that the maximum yield of camphene (25-27%), at high level of conversion, was obtained in the presence of Beta zeolites with Brönsted acid sites.…”

Selective Hydrogenation of Citral over a Carbon-titania Composite Supported Palladium Catalyst

“…These studies covered almost all important aspects such as active metals including mono-catalysts 2,[5][6][7][8][9][10][11] and the roles of catalyst supports. [12][13][14][15] Specifically, Yilmaz et al 12 reported the highest selectivity (90%) to citronellal so far, at complete conversion of citral over Pd/natural zeolite, which was explained by the active metal properties and the absence of significant internal diffusion limitations.…”