# US 10,501,318 B2 · Methods for fuel conversion

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- Number: US 10,501,318 B2
- Document ID: US10501318B2
- Status: Granted
- Kind: B2
- Application number: 16/166,746
- Filed: 2018-10-22
- Published: 2019-02-21
- Granted: 2019-12-10
- Earliest claimed: 2013-02-05
- Assignees: Ohio State Innovation Foundation
- Applicants: Ohio State Innovation Foundation
- Inventors: Liang-Shih Fan; Siwei Luo; Liang Zeng
- Web page: https://patentgrep.com/patent/US10501318B2

## CPC

- C01B 3/344: {using non-catalytic solid particles}
- B01J 8/12: moved by gravity in a downward flow
- C10J 3/57: Gasification using molten salts or metals (C10J3/02, C10J3/46 take precedence)
- C01B 2203/02: Processes for making hydrogen or synthesis gas
- C01B 2203/0255: containing a non-catalytic partial oxidation step
- C01B 2203/1241: Natural gas or methane
- C10J 2300/0916: Biomass
- C10J 2300/093: Coal
- C10J 2300/0953: Gasifying agents
- C10J 2300/1807: Recycle loops, e.g. gas, solids, heating medium, water
- Y02E 60/32: Hydrogen storage
- Y02P 20/133: Renewable energy sources, e.g. sunlight
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C10J: PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES (synthesis gas from liquid or gaseous hydrocarbons C01B; underground gasification of minerals E21B43/295); CARBURETTING AIR OR OTHER GASES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

In one embodiment described herein, fuel may be converted into syngas by a method comprising feeding the fuel and composite metal oxides into a reduction reactor in a co-current flow pattern relative to one another, reducing the composite metal oxides with the fuel to form syngas and reduced composite metal oxides, transporting the reduced composite metal oxides to an oxidation reactor, regenerating the composite metal oxides by oxidizing the reduced composite metal oxides with an oxidizing reactant in the oxidation reactor, and recycling the regenerated composite metal oxides to the reduction reactor for subsequent reduction reactions to produce syngas. The composite metal oxides may be solid particles comprising a primary metal oxide and a secondary metal oxide.

## Claims

### Claim 1

A method for converting carbonaceous fuel into syngas, the method comprising:
feeding composite metal oxides and the carbonaceous fuel into a reduction reactor having a top and a bottom, wherein the carbonaceous fuel and the composite metal oxides are fed into the top of the reduction reactor, whereupon the composite metal oxides form a packed bed and the composite metal oxides and the carbonaceous fuel flow downward through the reactor in a co-current flow pattern relative to one another;
reducing the composite metal oxides with the carbonaceous fuel in the reduction reactor to form syngas and reduced composite metal oxides;
removing the syngas and the reduced composite metal oxides from the bottom of the reduction reactor wherein the syngas comprises hydrogen and carbon monoxide;
transporting the reduced composite metal oxides to an oxidation reactor;
regenerating the composite metal oxides by oxidizing the reduced composite metal oxides with an oxidizing reactant in the oxidation reactor; and
recycling the regenerated composite metal oxides to the reduction reactor for subsequent reduction reactions to produce syngas in the reduction reactor;
wherein the composite metal oxides comprise iron, titanium and oxygen and the reduced metal oxides comprise FeO·TiO2, or wherein the composite metal oxides comprise iron aluminum and oxygen and the reduced metal oxides comprise FeO·Al2O3.

### Claim 2 (depends on 1)

The method of claim 1, wherein the oxidizing reactant comprises air, oxygen, steam, carbon dioxide, or any combination thereof.

### Claim 3 (depends on 1)

The method of claim 1, wherein a ratio of hydrogen to carbon monoxide can be controlled.

### Claim 4 (depends on 1)

The method of claim 1, wherein the syngas comprises a stoichiometric ratio of carbon monoxide to hydrogen of about 1:2.

### Claim 5 (depends on 1)

The method of claim 1, wherein the carbonaceous fuel is co-injected with a carbon-rich or hydrogen-rich reactant to change a carbon monoxide to hydrogen ratio of the syngas.

### Claim 6 (depends on 1)

The method of claim 1, wherein oxygen or oxygen releasing material is introduced into the reduction reactor to increase reaction kinetics for syngas production.

### Claim 7 (depends on 1)

The method of claim 1, wherein the reducing of the composite metal oxides occurs at a temperature in the range of between about 500° C. and about 1200° C.

### Claim 8 (depends on 1)

The method of claim 1, wherein the syngas comprises at least about 85 mol % carbon monoxide and hydrogen.

### Claim 9 (depends on 1)

The method of claim 1, wherein the syngas comprises carbon dioxide in an amount that is less than about 10 mol % of the syngas, and steam in an amount that is less than about 10 mol % of the syngas.

### Claim 10 (depends on 1)

The method of claim 1, wherein the composite metal oxides further comprises a dopant/promoter comprising Ca, Ce, Pt, Ru, Rh, La, Fe, Cu, oxides thereof, or any combination thereof.