# US 12,758,959 B2 · Supported polymetallic oxide tandem catalyst, preparation method and application thereof

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- Number: US 12,758,959 B2
- Document ID: US12758959B2
- Status: Granted
- Kind: B2
- Application number: 18/601,509
- Filed: 2024-03-11
- Published: 2024-09-19
- Granted: 2026-10-13
- Earliest claimed: 2023-03-15
- Assignees: Tianjin University
- Applicants: Tianjin University
- Inventors: Jinlong Gong; Wei Wang; Sai Chen; Chunlei Pei; Zhijian Zhao
- Web page: https://patentgrep.com/patent/US12758959B2

## CPC

- B01J 37/024: {Multiple impregnation or coating}
- B01J 21/04: Alumina
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 21/08: Silica
- B01J 23/06: of zinc, cadmium or mercury
- B01J 23/08: of gallium, indium or thallium
- B01J 23/22: Vanadium
- B01J 23/26: Chromium
- B01J 23/34: Manganese
- B01J 23/8472: {Vanadium}
- B01J 29/076: containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J 37/009: {Preparation by separation, e.g. by filtration, decantation, screening}
- B01J 37/0236: {Drying, e.g. preparing a suspension, adding a soluble salt and drying}
- B01J 37/088: {Decomposition of a metal salt}
- C07C 5/324: {with metals}
- C07C 2521/04: Alumina
- C07C 2521/06: Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- C07C 2521/08: Silica
- C07C 2523/06: of zinc, cadmium or mercury
- C07C 2523/08: of gallium, indium or thallium
- C07C 2523/22: Vanadium
- C07C 2523/26: Chromium
- C07C 2523/34: Manganese
- C07C 2523/745: Iron
- C07C 2523/847: Vanadium, niobium or tantalum
- C07C 2529/076: containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The present disclosure discloses a supported polymetallic oxide tandem catalyst, preparation method and application thereof, a surface of the support is supported with an oxide of metal A and then with metal vanadate nano-particles; and the oxide of metal A serves as a direct dehydrogenation catalytic site, and the metal vanadate nano-particles serve as a selective hydrogen combustion site. In the application of the tandem catalyst, dehydrogenation site and selective hydrogen combustion site are coupled at the nano-scale, and this coupling mechanism shifts the reaction equilibrium to the alkenes through the selective combustion of byproduct hydrogen, which effectively surpasses the thermodynamic limit; and meanwhile, the combustion of hydrogen releases chemical energy, and provides heat energy through direct heating, enabling the self-heating operation of the reaction. The present disclosure has the outstanding advantages of high single-pass conversion rate of light alkanes and high selectivity towards target product alkenes.

## Claims

### Claim 1

A supported polymetallic oxide tandem catalyst, comprising a support, wherein a surface of the support is supported with an oxide of metal A and then with metal vanadate nano-particles; and the oxide of metal A serves as a direct dehydrogenation catalytic site, and the metal vanadate nano-particles serve as a selective hydrogen combustion site;
wherein, the oxide of metal A is vanadium oxide or chromium oxide which is sub-monodispersed on the surface of the support, or zinc oxide nano-particles or gallium oxide nano-particles which are uniformly loaded on the surface of the support; and metal M in the metal vanadate is selected from one of Fe, Bi, and Mn; and
wherein a particle size of the metal vanadate nano-particles ranges from 100 nm to 200 nm, and a particle size of the zinc oxide nano-particles or the gallium oxide nano-particles ranges from 2 nm to 5 nm.

### Claim 2 (depends on 1)

The supported polymetallic oxide tandem catalyst according to claim 1, wherein the support is Al2O3, SiO2, TiO2, or a molecular sieve.

### Claim 3 (depends on 1)

The supported polymetallic oxide tandem catalyst according to claim 1, wherein a mass of the metal A is 1 to 10 wt. % of a total mass of the catalyst, and a mass of the metal vanadate is 10 to 50 wt. % of the total mass of the catalyst.