immobilized catalyst

immobilized catalyst

[i¦mō·bə‚līzd ′kad·ə‚list]
(chemistry)
A molecular catalyst that is bound without substantial change in its structure to an insoluble solid to prevent solution of the catalyst in the contacting liquid. Also known as anchored catalyst.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The mesoporous Ti[O.sub.2] of pure anatase phase with sharp pore distribution and large surface area was synthesized to increase the degree of distribution and homogeneity of immobilized catalyst [39, 40].
Immobilized catalyst was then injected and ethylene pressure was increased quickly to and kept at 40 bar.
[Me.sub.2]Si([C.sub.5][Me.sub.4])(N-tBu)Ti[Cl.sub.2] (CGC), (nBuCp)[.sub.2]Zr[Cl.sub.2], and [Me.sub.2]Si([C.sub.5][Me.sub.4])(N-tBu)Ti[Cl.sub.2]/(nBuCp)[.sub.2]Zr[Cl.sub.2] immobilized catalyst systems were successfully prepared on silica.
In an immobilized catalyst surface, which has been tested in this study, adsorption process can be neglected due to low accessible active sites.
The effect of various operating parameters, such as the immobilized catalyst amount, the initial BPA concentration, the treatment time, the water matrix, the addition of [H.sub.2][O.sub.2], and the presence of other organic substances, on process efficiency, was investigated.
Since Ti[O.sub.2] in slurry has extensively been used for photocatalytic purposes, an extra run was carried out to compare the efficiencies of slurry and immobilized catalysts. Hence, 0.65 mg Ti[O.sub.2] powder was added to the reaction mixture, and complete removal of 100 [micro]g/L BPA could be achieved after 35 min of reaction (data not shown).
This is very promising for their potential use as immobilized catalyst in batch or flow reactor [31].
Also, photocatalytic oxidation of phenol was usually investigated in a slurry reactor because of the easy handling, less limitation on mass transfer, and more efficiency than a reactor using immobilized catalysts [12].
Chemists here describe palladium-mediated solid-phase organic synthesis, immobilized catalysts and ligands, and palladium-mediated multifunctional cleavage.