heterogeneous catalysis

(redirected from Heterogeneous catalyst)

heterogeneous catalysis

[‚hed·ə·rə′jē·nē·əs kə′tal·ə·səs]
(chemistry)
A chemical process in which the catalyst is in a separate phase, usually the reactants and products are in gaseous or liquid phases and the catalyst is a solid, and the catalytic reaction occurs on the surface of the solid.
References in periodicals archive ?
Shaikh, H-ZSM-5 zeolite synthesis by sourcing silica from the wheat husk ash: characterization and application as a versatile heterogeneous catalyst in organic transformations including some multicomponent reactions, J.
Current analysis focuses on the use of ironcontaining waste as a heterogeneous catalyst in the reduction of industrial emissions of nitrous oxide.
Based on the mass spectra of the products the results are similar to the homogeneous reaction; but, respecting the stereoselectivity, comparing the reactions where parameters were 50:1 substrate/catalyst ratio, 24 h, 500 Psi to homogeneous and biphasic hydrogenation reaction, this last show a high selectivity with a high percent of conversion to one hydrogenation product which was not possible to identify using NMR technique due to the formation of a mixture, even using heterogeneous catalyst.
As silica sulfuric acid is a heterogeneous catalyst, it was separated by simple filtration after dilution of the reaction mixture with CH[Cl.
Presently, heterogeneous catalyst commonly used in hydrotreating/hydrocracking of heavy petroleum fractions, vacuum residual oil, and heavy crude oil have been found applicable to catalytic upgrading process in situ (CAPRI) (Weissman, et al.
To solve these problems, heterogeneous catalyst process is suggested (Kawashima et al.
Heterogeneous catalyst of cyclohexane exhibit leaching of active metal ions, extreme reaction conditions (2 MPa pressure and 177[degrees]C temperature), and low activity (Suresh et al.
BASF will benefit especially from hte's experience as a global leader in the application of high throughput methods to heterogeneous catalyst R&D," says Dr.
BASF will benefit especially from hte's experience as a global leader in the application of high-throughput methods to heterogeneous catalyst R&D," stated Dr.
In this regard, the text could easily serve as the required text for two academic courses, one in heterogeneous catalyst fundamentals and the second in industrial catalytic processes.
An efficient selective hydrolysis of di-/tri-O-isopropylidene derivatives of sugars and polyhydroxy alcohols to mono-O-isopropylidene derivatives has been developed using a sulfonated carbon nanocage as a reusable heterogeneous catalyst.

Full browser ?