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1. (WO2019041041) RÉACTIONS CATALYTIQUES ASSISTÉES PAR MICRO-ONDES UTILISANT DES PARTICULES DE LIT MODIFIÉES
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. A method for selectivity converting gaseous reactants into primary products over undesired secondary products, the method comprising:

providing a plurality of solid bed particles in a gas-solid reactor in presence of the gaseous reactants, each solid bed particle comprising a core and a dielectric coating deposited on a surface of the core;

irradiating the gas-solid reactor with microwaves for heating the dielectric coating of the solid bed particles, the dielectric coating locally transferring thermal energy to the surrounding gaseous reactants which are thereby selectively converted into the primary products.

2. The method of claim 1 , wherein the core is made of silica, alumina, olivine, FCC, zeolite, quartz, glass a combination thereof.

3. The method of claim 1 or 2, wherein the dielectric coating is made of a material having a ratio of loss factor to a dielectric constant between 0.5 to 1.

4. The method of any one of claims 1 to 3, wherein the dielectric coating is made of a metallic compound, a carbonaceous compound, or a combination thereof.

5. The method of claim 4, wherein the metallic compound is a transition metal or a noble metal.

6. The method of claim 5, wherein the metallic compound is titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc or an alloy thereof.

7. The method of claim 4, wherein the carbonaceous compound is in the form of graphine, graphite or amorphous carbon.

8. The method of any one of claims 1 to 7, wherein the solid bed particles have a particle size distribution ranging from 70 microns to 1 mm.

9. The method of any one of claims 1 to 9. wherein the solid bed particles are carbon-coated sand particles, for which the core of each solid bed particle is made of silica sand and the dielectric coating is made of carbon.

10. The method of claim 9, wherein the solid bed particle has a carbon content between 0.1 wt% and 3 wt% with respect to a total weight of the particle.

1 1. The method of claim 9 or 10, wherein the carbon-coated sand particles have a particle size between 200 and 250 μηι.

12. The method of any one of claims 9 to 1 1 , comprising producing the carbon-coated sand particles by thermal decomposition of methane to obtain a given amount of carbon, and chemical vapor deposition of the given amount of carbon as a carbon coating on the core.

13. The method of claim 12, wherein the thermal decomposition of methane and the chemical vapor deposition of the carbon coating are performed simultaneously in an induction-heated fluidized bed reactor.

14. The method of claim 13, comprising controlling a reaction time and temperature within the induction-heated fluidized bed reactor to obtain a uniform carbon coating of a desired thickness over the core.

15. The method of any one of claims 1 to 14, wherein each solid bed particle further comprises a catalytically active material supported on a surface of the dielectric coating, the catalytically active material being heated via thermal conduction from the heated dielectric coating and further increasing conversion of the surrounding gaseous reactants into the primary products.

16. The method of claim 15, further comprising supporting the catalytic material on the surface of the dielectric coating of the bed particle.

17. The method of claim 16, wherein supporting the catalytic material is performed via impregnation, plasma deposition, polyol-assisted deposition, hydrothermal synthesis or ultrasound-assisted deposition.

18. A bed particle comprising a core particle and a dielectric coating deposited on an external surface of the core particle, the bed particle being sized for use in a fixed bed reactor or a fluidized bed reactor.

19. The bed particle of claim 18, wherein the core particle is made of a bed material suitable for a gas-solid reactor.

20. The bed particle of claim 18 or 19, wherein the core particle is made of silica, alumina, olivine, FCC, zeolite quartz, glass or a combination thereof.

21. The bed particle of any one of claims 18 to 20, wherein the dielectric coating is made of a metallic compound, a carbonaceous compound, or a combination thereof.

22. The bed particle of claim 21 , wherein the metallic compound is a transition metal or a noble metal.

23. The bed particle of claim 21 , wherein the carbonaceous compound is in the form of graphine, graphite or amorphous carbon.

24. The bed particle of any one of claims 18 to 23, having a particle size distribution ranging from 70 microns to 1 mm.

25. The bed particle of any one of claims 18 to 24, being a carbon-coated sand particle, wherein the core particle is made of silica sand and the dielectric coating is made of carbon.

26. The bed particle of claim 25, having a carbon content between 0.1 wt% and 3 wt% with respect to a total weight of the particle.

27. The bed particle of claim 25 or 26, wherein the carbon-coated sand particles have a particle size between 200 and 250 μηι.

28. The bed particle of any one of claims 25 to 27, wherein the dielectric coating comprises a plurality of carbon nanosized layers deposited on the core.

29. The bed particle of any one of claims 25 to 28, being prepared by induction-assisted chemical vapor deposition in a fluidized bed.

30. The bed particle of any one of claims 18 to 29, further comprising a catalytic material supported on the dielectric coating and having active sites.

31. The bed particle of claim 30, wherein the catalytic material is supported via impregnation, plasma deposition, polyol-assisted deposition, hydrothermal synthesis or ultrasound-assisted deposition.

32. Use of the bed particle as defined in any one of claims 18 to 29, as a catalyst support for supporting a catalytically active material.

33. Use of the bed particle as defined in any one of claims 18 to 31 , as a microwave receptor in a microwave-assisted thermochemical process.

34. Use of the bed particle as defined in any one of claims 18 to 31 , for enhancing selectivity and yield of partial oxidation of hydrocarbons such as n-butane, pyrolysis, biomass gasification, thermal cracking, gas cleaning and any thermochemical conversion.

35. A process for reforming methane into syngas, the process comprising exposition of methane to a microwave heated bed within a fluidized bed containing bed particles, each bed particle comprising a core, a dielectric coating deposited on an external surface of the core, and a catalytically active phase supported on the dielectric coating.

36. The process of claim 35, wherein the catalytically active phase is selected to catalyze the following primary gas-phase reaction: CH4 + C02 → 2CO + 2H2

37. The process of claim 35 or 36, wherein the catalytically active phase is a transition metal.

38. The process of claim 37, wherein the transition metal is titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc or an alloy thereof.

39. The process of any one of claims 35 to 38, wherein the core is made of silica sand.

40. The process of any one of claims 35 to 39, wherein the dielectric coating is made of carbon.

41. The process of claim 40, wherein the dielectric coating is made of a plurality of nanosized carbon layers.

42. The process of any one of claims 35 to 41 , wherein the reforming is performed at a temperature range between 650°C and 900°C.

43. A process for thermally cracking a hydrocarbon-containing stream, the process comprising

irradiating catalytic and dielectric bed particles provided within a fluidized bed reactor with microwaves, the catalytic and dielectric bed particles comprising a core particle, a dielectric coating provided on an external surface of the core particle, and a catalytically active phase supported on the dielectric coating and having active sites; and

contacting the hydrocarbon-containing stream with the heated catalytic and dielectric particles to locally transfer heat from the catalytic and dielectric bed particles to the hydrocarbon-containing stream, and thereby selectively activate cracking reactions into primary products.