摘要:
Alkenes, unsaturated saturated carboxylic acids, saturated carboxylic acids and their higher analogues are prepared cumulatively from corresponding alkanes utilizing using a multi-staged catalyst system and a multi-stage process which comprises steam cracking of alkanes to corresponding alkenes at flame temperatures and at short contact times in combination with one or more oxidation catalysts for catalytically converting the corresponding alkenes to further corresponding oxygenated products using short contact time reactor conditions.
摘要:
A supported catalyst comprising a mixed metal oxide is useful for the vapor phase catalytic partial oxidation of an alkane, or a mixture of an alkane and an alkene, to an unsaturated carboxylic acid and for the vapor phase ammoxidation of an alkane, or a mixture of an alkane and an alkene, to an unsaturated nitrile.
摘要:
Improved processes for the preparation of olefins, unsaturated carboxylic acids and unsaturated nitrites involve the use of dehydrogenation catalysts suitable for the conversion of alkanes to alkenes and catalysts suitable for the conversion of alkanes and/or alkenes to unsaturated carboxylic acids or unsaturated nitrites.
摘要:
Structured catalysts useful for oxidizing alkanes, alkenes and combinations of alkanes and alkenes are described. The structure catalysts comprise one or more mixed metal oxide catalysts having a three dimensional structure that is self-supporting and that facilitates movement of gas phase reactants and products and one or more mixed metal oxide catalysts deposited on a three dimensional form of continuous unitary structures having openings that facilitates movement of gas phase reactants and products.
摘要:
A catalyst comprising a mixed metal oxide is useful for the vapor phase oxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated carboxylic acid and for the vapor phase ammoxidation of an alkane or a mixture of an alkane and an alkene to an unsaturated nitrile.
摘要:
Modified metal oxide catalysts are disclosed which have different chemical, physical and catalytic properties, when used for catalytic conversions of carbon based compounds, as compared to corresponding unmodified metal oxide catalysts. Methods for preparing the modified catalysts are described and their utility in catalytic process is described. Alkenes, unsaturated saturated carboxylic acids, saturated carboxylic acids and their higher analogues are prepared directly from corresponding alkanes, alkenes or alkanes and alkenes utilizing using one or more modified metal oxide catalysts.
摘要:
The present invention includes a process for preparing an improved catalyst having the steps of admixing compounds containing the components of the catalyst and at least one solvent to form a precursor; extracting the precursor with a supercritical stream to form a processed precursor, where the extracting step includes drying the precursor, atomizing the precursor, and combinations thereof; and calcining the processed precursor to form a catalyst. The process may include drying the precursor by introducing the precursor, which has been previously washed with an alcohol, such as ethanol or methanol, into a vessel and introducing the supercritical stream at a pressure and temperature above the critical point of the stream into the vessel. The process may include drying and atomizing the precursor by introducing the supercritical solvent into the vessel at a pressure and a temperature above critical point of the solvent and introducing the precursor into the extraction vessel through a nozzle. The process may also include drying and atomizing the precursor by introducing the precursor and the supercritical solvent into the vessel through a nozzle.
摘要:
A mixed metal oxide, which may be an orthorhombic phase material, is improved as a catalyst for the production of unsaturated carboxylic acids, or unsaturated nitrites, from alkanes, or mixtures of alkanes and alkenes, by: contacting with a liquid contact member selected from the group consisting of organic acids, alcohols, inorganic acids and hydrogen peroxide to form a contact mixture; recovering insoluble material from the contact mixture; calcining the recovered insoluble material in a non-oxidizing atmosphere; admixing the calcined recovered insoluble material with (i) at least one promoter element or compound thereof and (ii) at least one solvent for the at least one promoter element or compound thereof; removing the at least one solvent to form a catalyst precursor; and calcining the catalyst precursor.
摘要:
Processes for preparing mixed metal oxide catalysts suitable for partial oxidation of alkanes, alkenes and mixtures thereof, where in the processes comprise the steps of: providing an aqueous aerosol of one or more metal oxide catalyst precursors; and irradiating the aqueous aerosol of one or more metal oxide catalyst precursors with microwave energy. Optionally, the catalyst may be further modified using one or more chemical treatments, one or more physical treatments and one or more combinations of chemical and physical treatments, to further improve catalyst performance characteristics.