Supported liquid-phase catalysts

Supported liquid-phase catalysts containing ruthenium complexes for selective hydrogenation of $alpha;,$beta;-unsaturated aldehyde: importance of interfaces between liquid film, solvent, and support for the control of product selectivity

“…In addition, these authors have pointed out an important aspect that the hydrophilic nature of the C=O bond contributes to its selective hydrogenation. Those results demonstrate that one can find other factors, ineffective for homogeneous reactions, in controlling the catalytic performance of metal complexes for biphasic catalyses and similar heterogenized metal complex catalysts including supported liquid-phase catalysts (SLPC), in which active species exist in a liquid film dispersed on a support [10][11][12][13][14]. Water and other liquids like ethylene glycol have been used as supporting liquids and porous materials like silica gel as supports, and granular SLPC samples prepared have been used by dispersing in organic solvents for a few chemical transformations of hydrogenation, hydroformylation, and Heck coupling reactions [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Supported liquid‐phase catalytic membrane reactor–separator for homogeneous catalysis

“…For this discussion, it is assumed that the reactant undergoes an irreversible catalytic reaction, A --B, in the SLPC layer to form the product. If both the reactant and the product are in a gaseous or vaporous form, it is advantageous to only partially impregnate the porous support with the catalyst solution (Rony, 1968;. At low liquid catalyst loading q, defined as the fraction of the pore volume of the support that is occupied by the catalyst solution, the reaction rate increases with q, but goes through a maximum at an intermediate value of q, finally reducing at higher values of q due to the increased diffusional resistance in the SLPC layer.…”

“…These include: i) supported liquid-phase catalysis (SLPC) (Rony, 1968;Rony and Roth, 1975;, in which the liquid-phase catalyst is Correspondence concerning this article should be addressed to R. Datta. coated on the pore walls of a porous support; ii) supported molten-salt catalysis (SMSC) (Rao and Datta, 1988) which avoids solvent volatilization encountered in SLPC; iii) matrixbound complexes (Murrell, 1977;Pittman, 1982;Hartley, 1985); iv) zeolite-entrapped complexes (Davis et al, 1986); and v) catalytic liquid membrane (Ollis et al, 1972).…”

Shapes‐elective Catalysis durch Supported Liquid‐Phase Katalysatoren (SLPC)

“…Bio- [2] Kotowski, W ; Benbenek, H.; Ledakowicz, S.; Gorski, R.: [3] Kotowski Neben dieser fur die Nutzung von Shape-selective Catalysis in technischen Prozessen wichtigen Erkenntnis lassen sich fur mechanistische Untersuchungen der Hydroformylierung, bzw. auch allgemein fur ahnlich komplexe katalytische Umsetzungen, weitere Erkenntnisse ableiten.…”