A catalyst for the carbonylation of dimethyl ether to methyl acetate. The catalyst comprises a zeolite, such as a mordenite zeolite, at least one Group IB metal, such as copper, and/or at least one Group VIII metal, such as iron, and at least one Group IIB metal, such as zinc. Such a catalyst with combined metals provides enhanced catalytic activity, improved stability, and improved selectivity to methyl acetate, and does not require a halogen promoter, as compared to a metal-free or copper only zeolite.
The present invention is directed to a catalyst for hydrodesulfurization of thiohydrocarbons, said catalyst comprising highly dispersed nanoparticles of a transition metal selected from the group consisting of: iridium, palladium and iridium/palladium and methods of manufacture thereof.
Nanoparticle catalyst compositions and methods for preparation of same are described. The nanoparticle catalysts are platinum-free and are useful in effecting selective ring-opening reactions, for example in upgrading heavy oil. The catalyst may be of monometallic composition, or may comprise an alloyed or core-shell bimetallic composition. The nanoparticles are of controlled size and shape.
The present invention relates to novel Pt metal group catalysts and a process for the preparation thereof wherein a reverse microemulsion of a Pt metal in a water-in- hydrocarbon system ids prepared, some solvent is evaporated, a C1C4-alcohol is added to form a precipitate of Pt metal nanoparticles, which can be used as structured catalysts f.e. in woven fabrics.
The invention relates to a structured catalyst based on sintered metal fibers (SMF) coated by a ZnO layer impregnated with Pd-nanoparticles, reactions of organic starting material with hydrogen in the presence of said catalyst and vitamins, carotinoids, perfume ingredients, and/or food or feed ingredients prepared by using this reaction.
FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to methods of hydrogenation of acetylene alcohols that are intermediate organic compounds used in pharmaceutical and perfume industry. Selective hydrogenation of acetylene alcohols to the corresponding ethylene alcohols is carried out with hydrogen at concentration of acetylene alcohol from 0.22 to 0.88 mole/l at 60-90 C using micellar palladium-containing catalyst at amount from 1.66 to 6.66 g/l. The catalyst is prepared by immobilization of palladium acetate on polystyrene- -poly-4-vinylpyridine block-copolymer by reduction of immobilized Pd(II) to Pd(0), applying of obtained palladium nanoparticles on aluminium oxide and treatment by ultrasonic oscillation at intensity 2.5-3 Wt/cm2, frequency 22 kHz for 1-4 min. EFFECT: improved method of hydrogenation, increased yield and effective rate of the synthesis.
FIELD: chemical technology. SUBSTANCE: linalool is produced from dehydrolinalool by selective hydrogenization on preliminary reduced palladium catalyst at increased temperature in hydrogen flow at concentration of dehydrolinalool 0.1-0.43 mole/l, at 40-70 C in the presence of heterogeneous catalyst made as a complex (η2-C60)Pd(PPh3)2, and applied on carbon carrier “Sibunit” at amount 0.05-0.3 g/l in inert medium. Linalool is an intermediate organic compound used in pharmaceutical and perfume industry. EFFECT: high purity of product, high rate of synthesis.
FIELD: extraction of valuable components from solids. SUBSTANCE: the method consists in preliminary grinding of vegetable raw material with a subsequent action by ultrasound at a frequency of 22 kHz and intensity of ultrasound action within 1 to 70 W/sq.cm for 60 to 420 s in a solution of ethanol. EFFECT: facilitated procedure.