Polynary Metal Oxide Phosphate

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The patent covers a new class of mixed-metal oxide phosphates with the general formula MaV4−aOb(PO4)c, where M can be various metals (such as Ti, Cr, Fe, etc.). These compounds have a defined crystal structure and are specifically designed to act as catalysts for gas-phase oxidation reactions, notably for the production of maleic anhydride from hydrocarbons like n-butane. The invention also includes novel methods to produce these compounds, aiming at improving catalyst stability and activity compared to existing technologies.

Use CasesContent extracted from patent full text and abstract with AI.

• Catalyst for the gas-phase oxidation of n-butane to produce maleic anhydride, which is an important industrial chemical intermediate.
• Catalysts for the selective oxidation of various C4+ aliphatic or aromatic hydrocarbons to value-added chemicals.
• Use as promotor phases to enhance or modify the activity and selectivity of vanadyl pyrophosphate-based catalysts.
• Potential use in the ammonoxidation of hydrocarbons to synthesise nitriles from alkenes or aromatics in the presence of ammonia and oxygen.
• Utilization in industrial processes requiring robust and selective oxidation catalysts, such as in fine chemicals, plastics, and resins manufacturing.

BenefitsContent extracted from patent full text and abstract with AI.

• Improved catalyst activity and selectivity for gas-phase hydrocarbon oxidation processes, particularly in the manufacture of maleic anhydride.
• Reduction or elimination of negative effects caused by organic residues during catalyst preparation, leading to better catalyst stability and structure retention.
• Enhanced control over catalyst properties by incorporating different metals (such as Ti, Cr, Fe) into the phosphate structure.
• Flexible and scalable synthesis routes, including solid state and wet chemical preparation methods, adaptable for industrial production.
• Potential to increase catalyst lifetime, yield, and process throughput, thus improving cost-efficiency and sustainability of chemical processes.

Technical Classifications (CPCs)

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Patent Abstract

The invention relates to a novel polynary metal oxide phosphate of general formula MaV4-aOb(PO4)c (I), wherein M represents one or more metals selected from the group including Ti, Zr, Hf,Cr, Fe, Co, Ni, Ru, Rh, Pd, Cu, Zn, B, Al, Ga and In, a has a value of 0 to 2.0, b has a value of 2.0 to 4.0, c has a value of 2.0 to 4.0, said novel compound having a crystal structure and being characterized by defined diffraction reflexes in powder X-ray diffraction. Preferred representatives are V4O3(PO4)3, CrV3O3(PO4)3, FeV3O3(PO4)3 and TiV3O3(PO4)3. The metal oxide phosphates are suitable as gas phase oxidation catalysts, e.g. for producing maleic anhydride from a hydrocarbon with at least four carbon atoms.