A dehydrogenation catalyst is described comprising an iron oxide, an alkali metal or compound thereof, and silver or a compound thereof. Further a process is described for preparing a dehydrogenation catalyst that comprises preparing a mixture of iron oxide, an alkali metal or compound thereof, and silver or a compound thereof and calcining the mixture. A process for dehydrogenating a dehydrogenatable hydrocarbon and a process for polymerizing the dehydrogenated hydrocarbon are also described.

Catalyst, its preparation and use

A process for preparing styrene from ethylbenzene in the presence of an iron oxide catalyst is presented. The catalyst is prepared from extruded alpha-FeOOH iron oxide particles derived from scrap metal via dehydration of a yellow alpha-Fe(OOH) intermediate via the Pennniman process and devoid of bound sulfate having a median size of at least 2 microns and results in improved catalyst activity.

Process for preparing styrene from ethylbenzene using a iron oxide catalyst

In order to increase performances of an iron oxide-potassium oxide system catalyst to be used for an alkyl aromatic hydrocarbon dehydrogenation reaction in the presence of steam, there is provided an alkyl aromatic hydrocarbon dehydrogenation catalyst wherein a little amount of titanium oxide is added by the mixing and kneading method or by the preceding addition to iron oxide in the production of the iron oxide-potassium oxide system catalyst to be used for the alkyl aromatic hydrocarbon dehydrogenation reaction in the presence of steam. The iron oxide-potassium oxide system catalyst is allowed to contain a little amount of titanium oxide, whereby an activity can be remarkably increased, as well as a selectivity in the same conversion ratio can also be improved in the alkyl aromatic hydrocarbon dehydrogenation reaction, and further the obtained catalyst exhibits stable performances with time on stream.

Alkyl aromatic hydrocarbon dehydrogenation catalyst and method for producing the catalyst

Dehydrogenation catalysts are prepared by a predoping process comprising, mixing iron oxide materials with a predopant to form a blend of iron oxide and predopant and heating the blend to the predoping conditions and thereafter forming a catalyst. The catalysts so prepared are useful in the dehydrogenation of a composition having at least one carbon--carbon double bond. Such catalytic uses include the conversion of ethylbenzene to styrene.

Dehydrogenation catalyst and process

In one aspect of the invention, a composition is presented comprising restructured iron oxide particles. A method is also presented for restructuring iron oxide particles to form low surface area iron oxide particles. In this method, iron oxide particles are contacted with an effective mount of a restructuring agent and are then heated until restructuring occurs.

Restructured iron oxide for use in iron oxide catalysts

Improved iron oxide catalysts for the dehydrogenation of ethylbenzene to styrene are made by forming a blend of chromium oxide and yellow iron hydrate and heating the blend to convert the yellow iron hydrate to red iron oxide prior to forming the catalyst.

Edward K. Dienes

Papers

Dehydrogenation catalyst and process for its preparation