homogeneous catalyst

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homogeneous catalyst

A catalyst that exists in the same phase as the chemicals it influences and the reactions it produces. See: phase

References in periodicals archive ?

Common examples of homogeneous catalysts includes: polymolybdates like phosphomolybdic acid, ammonium heptamolybdate, etc.

The catalytic upgrading of heavy crude oil in-situ: the role of hydrogen: a review

Pseudo-first order reaction rate constants ([k.sup.1]) and squared correlation coefficients ([R 2) for the degradation of BA with homogeneous catalysts No catalyst [Mn.sup.2+] [Ni.sup.2+] [k.sup.1] [10.sup.-4] [s.sup.-1] 12.2 11.5 12.5 [R.sup.2] 0.964 0.994 0.993 [Mo.sup.6+] [Fe.sup.2+] [Cu.sup.2+] [k.sup.1] [10.sup.-4] [s.sup.-1] 14.8 15.4 18.2 [R.sup.2] 0.995 0.956 0.997

Oxidative decomposition of benzoic acid in the presence of metal ionic catalysts/Bensoehappe oksudeeriv lagundamine metall-ioonsete katalusaatorite juuresolekul

For this reason, the highly active homogeneous catalysts which can be easily recycled and reused are highly attractive in this reaction.

Ultrasound Promoted Synthesis of Arylmethylenemalonitriles Catalyzed by Melamine

The book describes several heterogeneous catalysts currently in use, then shows how nanoscience can be used with artificial homogeneous catalysts. Some chapter topics include the structure and reactivity of single and multiple sites on heterogeneous and homogeneous catalysts, the relationship between catalysis with transition metal complexes and catalysis by nanoparticles, synthetic catalysts of nanometric dimensions, and nanostructured photovoltaic materials for solar energy conversion.

Selective nanocatalysts and nanoscience; concepts for heterogeneous and homogeneous catalysis

However, the removal of homogeneous catalysts is very time-consuming and expensive, which creates a big problem for pharmaceutical companies," Zubarev added.

Scientists create platinum nanocatalyst for industrial use by drug makers

Currently, heterogeneous catalysts have been developed for use in a transesterification reaction for biodiesel production due to the problems of homogeneous catalysts in terms of water treatment and the nonreusability of the catalyst.

Response Surface Methodology for Biodiesel Production Using Calcium Methoxide Catalyst Assisted with Tetrahydrofuran as Cosolvent

Sanford, "Heterogenization of homogeneous catalysts in metal-organic frameworks via cation exchange," Journal of the American Chemical Society, vol.

Facile TEMPO Immobilization onto Poly(acrylic acid)-Modified Magnetic Nanoparticles: Preparation and Property

Objective: In the past decade, artificial metalloenzymes (AMs) have emerged as an attractive alternative to the more traditional enzymes and homogeneous catalysts. Such hybrid catalysts result from the incorporation of an abiotic metal cofactor within a macromolecule (protein or oligonucleotide).

DrEAM: Directed Evolution of Artificial Metalloenzymes for In Vivo Applications

The yield of 3,5-diphenyl-4,5-dihydroisoxazole catalyzed by homogeneous catalysts, NaOH, is comparable to the result catalyzed by CaO under the suggested react condition, while the lowest catalytic activity is shown over Na2CO3, only proceed with yield of 21.4% indicating the strong basic sites of CaO is highly active for this reaction.

Modified CaO Catalyzed Heterogeneous Synthesis of 3,5-diphenyl-4,5-dihydroisoxazole

The problems of homogeneous catalysts in recovering and recycling lead to the loss of metal and ligands and incorporation of impurities in the products [11].

Quadrapure-supported palladium nanocatalysts for microwave-promoted Suzuki cross-coupling reaction under aerobic condition

Homogeneous catalysts; activity--stability--deactivation.

Homogeneous catalysts; activity--stability--deactivation

These catalysts can now compete more closely with homogeneous catalysts, which industry traditionally uses for reactions that require high selectivity such as those involved in the manufacture of medicines or other fine chemicals," he said.