Dehydrogenation process and catalyst
AssigneePetro-Tex Chemical Corporation
InventorHarold E. Manning
Life of this patent
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Abstract
Magnesium chromite dehydrogenation catalyst are improved by preparation in oxygen deficient or essentially inert calcination atmospheres and in the presense of halogen, either singularly or in combination.
Claims17
In a process for the preparation of magnesium chromite for use in cyclic dehydrogenation comprising the steps of intimately mixing precursors of magnesium chromite and heating said precursors to a temperature in the range of 550.degree. to 900.degree. C said precursors being nitrates, hydroxides, hydrates, oxalates, carbonates, acetates, formates, halides or oxides, wherein the improvement comprises forming said chromite in an essentially inert atmosphere of nitrogen, helium, neon, argon, krypton, xenon, radon or mixtures thereof, which may contain up to about 3 mole percent of a reactive gas as determined in a static atmosphere.
In a process of preparing magnesium chromite for use as dehydrogenation catalyst comprising the steps of:
- slurring in water, finely divided water insoluble precursors of magnesium chromite to form an intimate mixture thereof said precursors being nitrates, hydroxides, hydrates, oxalates, carbonates, acetates, formates, halides or oxides, drying said precursors, heating said intimate mixture of precursors to a temperature in the range of 550.degree. to 900.degree. C to form magnesium chromite, and intimate admixing therewith a promoting amount of aluminum wherein the improvement comprises forming said chromite in an essentially inert atmosphere of nitrogen, helium neon, argon, krypton, xenon, radon or mixtures thereof which may contain up to about 3 mol percent of a reactive gas as determined in a static atmosphere.
The process according to claim 51 wherein 0.0001 to 1.0 mol of a halogen per atom of chromium selected from the group consisting of chlorine, bromine and iodine is present during said heating in intimate contact with said precursors.
Dependencies are inferred from the claim text.