Hierarchical aluminophosphates as catalysts for the Beckmann rearrangement
AssigneesAdvanSix Resins & Chemicals LLC, University of Southampton
InventorsAlan B. Levy, Robert Raja, Stephanie H. Newland, Scott R. Keenan, Simon R. Bare
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Abstract
Methods for producing lactams from oximes by performing a Beckmann rearrangement using a hierarchical porous aluminophosphate catalyst having interconnected microporous and mesoporous networks are provided. Exemplary catalysts include a plurality of weak Brønsted acid active sites, including silicon-containing aluminophosphates having the IZA framework code AFI, such as SAPO-5, CHA, such as SAPO-34, and FAU, such as SAPO-37.
Claims12
A method of making a catalyst for a Beckmann rearrangement reaction, wherein the catalyst is a hierarchical porous catalyst with a silicoaluminophosphate framework, a plurality of interconnected micropores, and a plurality of mesopores interconnected with the micropores, the method comprising:
- combining an organosilane surfactant, at least one structure directing agent, a metal precursor, a silicon source, phosphoric acid, and water to form a mixture;
- wherein combining the organosilane surfactant, the structure directing agent, the metal precursor, the silicon source, the phosphoric acid, and the water to form the mixture includes:
- mixing the metal precursor and the at least one structure directing agent together;
- adding the silicon source to the mixture of the metal precursor and the at least one structure directing agent;
- adding the organosilane surfactant to the mixture after adding the silicon source;
- adding the water to the mixture after adding the organosilane surfactant;
- and
- adding the phosphoric acid to the mixture after adding the water;
- heating the mixture to form a solid;
- and
- calcining the solid to form the catalyst, wherein the organosilane surfactant includes dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and the metal precursor includes aluminum;
- wherein the catalyst is a hierarchical SAPO-34 catalyst.
A method of making a catalyst for a Beckmann rearrangement reaction, wherein the catalyst is a hierarchical porous catalyst with a silicoaluminophosphate framework, a plurality of interconnected micropores, and a plurality of mesopores interconnected with the micropores, the method comprising:
- combining an organosilane surfactant, at least one structure directing agent, a metal precursor, a silicon source, phosphoric acid, and water to form a mixture;
- wherein combining the organosilane surfactant, the structure directing agent, the metal precursor, the silicon source, the phosphoric acid, and the water to form the mixture includes:
- mixing the metal precursor and the phosphoric acid together with a portion of the water to form a first solution;
- adding the organosilane surfactant to the at least one structure directing agent to form a second solution;
- adding the silicon source to the second solution;
- and
- adding the second solution including the silicon source to the first solution to form the mixture;
- heating the mixture to form a solid;
- and
- calcining the solid to form the catalyst, wherein the organosilane surfactant includes dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and the metal precursor includes aluminum;
- wherein the catalyst is a hierarchical SAPO-37 catalyst.
Dependencies are inferred from the claim text.