Search results
Results from the WOW.Com Content Network
Hydrogenation is a chemical reaction between molecular hydrogen (H 2) and another compound or element, usually in the presence of a catalyst such as nickel, palladium or platinum. The process is commonly employed to reduce or saturate organic compounds. Hydrogenation typically constitutes the addition of pairs of hydrogen atoms to a molecule ...
Hydrogenation of ethene on a catalytic solid surface (1) Adsorption (2) Reaction (3) Desorption. Heterogeneous catalysis is catalysis where the phase of catalysts differs from that of the reagents or products. [1] The process contrasts with homogeneous catalysis where the reagents, products and catalyst exist in the same phase.
Heterogeneous catalytic reactors put emphasis on catalyst effectiveness factors and the heat and mass transfer implications. Heterogeneous catalytic reactors are ...
First reactor at the Oppau plant in 1913 Profiles of the active components of heterogeneous catalysts; the top right figure shows the profile of a shell catalyst. The Haber–Bosch process relies on catalysts to accelerate N 2 hydrogenation. The catalysts are heterogeneous solids that interact with gaseous reagents. [41]
[5] [6] Another reaction is hydrogenation of halogenated aromatic amines is also important for the synthesis of herbicides and pesticides as well as diesel fuel. [5] In organic chemistry, hydrogenation of a C-Cl bond with deuterium is used to selectively label the aromatic ring for use in experiments dealing with the kinetic isotope effect.
Plucinkski and coworkers developed a continuous Mizoroki-Heck and hydrogenation sequence consisting of two separated packed-bed reactors containing Pd/C. [15] Because the Pd/C-catalyzed hydrogenation proceeds via a heterogeneous mechanism, [16] metal leaching due to the second hydrogenation step is minimal, and Pd leached from the first part of ...
In heterogeneous catalysis, hydrogen molecules can be adsorbed and dissociated by the metal catalyst. Hydrogen spillover is the migration of hydrogen atoms from the metal catalyst onto the nonmetal support or adsorbate. [1] [2] Spillover, generally, is the transport of a species adsorbed or formed on a surface onto another surface. [3]
A Lindlar catalyst is a heterogeneous catalyst consisting of palladium deposited on calcium carbonate or barium sulfate then poisoned with various forms of lead or sulfur. It is used for the hydrogenation of alkynes to alkenes (i.e. without further reduction into alkanes). It is named after its inventor Herbert Lindlar, who discovered it in 1952.