Abstract:
Molybdenum containing oxidation catalysts are prepared by reducing hexavalent molybdenum to a valence state below +6 prior to or during the catalyst preparation. Reproducible catalysts with superior catalytic activity are conveniently made by this process.
Abstract:
The process in this invention relates to the conversion of organic compounds selected from the group consisting of the nbutylenes, butadiene, crotonaldehyde and furan in a selective manner to maleic anhydride in the presence of a catalyst comprising the mixed oxides of antimony and molybdenum.
Abstract:
1. A process for conversion of chemical energy directly into electrical energy which comprises the steps of supplying an aqueous solution of hydrazine to the interface between an anode and an aqueous electrolyte in a fuel cell, supplying an oxidizing agent to the interface between a cathode and an aqueous electrolyte in said fuel cell said anode and cathode being ionically connected, and electrically connecting said anode and cathode through an electrical load.
Abstract:
Maleic anhydride is made from n-butane or n-butene in a tubular reactor having an undivided reaction zone which contains two different catalysts-the first catalyst converts at least part of the n-butane or n-butene to butadiene and the second catalyst converts at least part of this product to maleic anhydride.
Abstract:
THE INSTANT APPLICATION DEALS WITH A PROCESS FOR THE MANUFACTURE OF MONOOLEFINICALLY UNSATURATED ALIPHATIC NITRILES BY THE CATALYTIC OXIDATION OF OLEFIN USING CYANIDE AND A MOLECULAR OXYGEN-CONTAINING GAS, BUT NO AMMONIA.
Abstract:
Catalysts containing antimony and molybdenum are promoted by the addition of iron or vanadium or mixture thereof to give very desirable catalysts for the preparation of maleic anhydride from 1,3-butadiene, n-butylenes, crotonaldehyde and furan.
Abstract:
(5246) A process is provided for the preparation of fluid bed oxidation catalysts containing the mixed oxides of vanadium and phosphorus, comprising the steps of preparing the catalyst precursor, comminuting the precursor, introducing the precursor into water to form an aqueous slurry and spray drying the slurry. The resulting microspheroidal particles are excellent fluid, bed catalysts for the preparation of maleic anhydride from 4-carbon atom hydrocarbons. 23.
Abstract:
THE USE OF COATED CATALYSTS IN TEE PREPARATION OF MALEIC ANHYDRIDE Very desirable temperature control and selectivity are obtained in the oxidation of benzene to maleic anhydride using an oxidation catalyst of an essentially inert support of at least 20 microns containing on its outer surface a coating of a catalytically active oxide material or a catalytically active oxide material and an oxide support.
Abstract:
Vanadium-free catalysts consisting essentially of oxides of titanium and phosphorus have been found to be especially effective in the oxidation of n-butane, n-butenes and 1,3-butadiene with molecular oxygen in the vapor phase to yield maleic anhydride. The reaction with n-butane gives an especially pure product in good yield and selectivity.
Abstract:
Maleic anhydride is produced by the oxidation of 1,3-butadiene, n-butylenes, crotonaldehyde and furan with molecular oxygen in the vapor phase in the presence of catalytic oxides of antimony, molybdenum, at least one element selected from the group consisting of niobium, zirconium, titanium and tantalum and optionally a reducing agent capable of reducing at least part of the molybdenum in the catalyst to a valence state below +6 selected from the group consisting of hydrazine hydrate, molybdenum, tungsten, magnesium, aluminum, and nickel. This catalyst may optionally contain one or more elements selected from the group consisting of Li, Ag, Ce, Cd, Co, As, Si, Zn, Ge, Bi, Ru, Pt, U, Al and Ni. Especially desirable yields of maleic anhydride are obtained from 1,3-butadiene in the presence of a catalyst wherein molybdenum metal is used as a reducing agent.