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1. (WO2019025905) OLIVINE DOPED ZINC OXIDE FOR HOT AND COLD GAS CLEANING
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CLAIMS

1. A method of removing sulfur compounds from a gas, the method comprising:

contacting the gas with olivine doped zinc oxide; and collecting desulfurized gas.

2. The method of claim 1, wherein the sulfur compounds comprise hydrogen sulfide.

3. The method of any of claims 1 and 2, wherein the gas comprises natural gas and/or syngas.

4. The method of any of claims 1 and 2, wherein olivine in the olivine doped zinc oxide comprises 7 to 10 wt.% of iron oxides.

5. The method of any of claims 1 and 2, wherein the olivine doped zinc oxide comprises 10 to 20 wt. % ZnO, and 80 to 90 wt.% olivine.

6. The method of any of claims 1 and 2, wherein the contacting the gas with olivine doped zinc oxide is performed at reaction conditions sufficient to form zinc sulfide (ZnS) and a product comprising desulfurized gas.

7. The method of claim 6, wherein the reaction conditions sufficient to form zinc sulfide and a gas product include a temperature in a range of 400 °C to 800 °C.

8. The method of any of claims 1 and 2, wherein the gas before the contacting comprises 10 to 100 ppm of hydrogen sulfide.

9. The method of any of claims 1 and 2, wherein the desulfurized gas comprises less than 100 ppb of hydrogen sulfide.

10. The method of any of claims 1 and 2, wherein the desulfurized gas is used to produce methanol.

11. The method of any of claims 1 and 2, wherein the gas is natural gas and the desulfurized gas comprises primarily methane.

12. The method of any of claims 1 and 2, wherein the gas is syngas and the desulfurized gas comprises primarily carbon monoxide and hydrogen.

13. The method of any of claims 1 and 2, wherein the olivine doped zinc oxide is prepared by steps comprising: wet-impregnating zinc nitrate with olivine to form an impregnated material; and

calcining the impregnated material to form olivine doped zinc oxide.

14. The method of claim 13, wherein the impregnated material is calcined at a temperature of 500 °C to 800 °C.

15. The method of any of claims 1 and 2, wherein the olivine doped zinc oxide has a molar ratio of zinc to iron in a range of 1 to 1.7.

16. The method of any of claims 1 and 2, wherein the olivine doped zinc oxide has a surface area of less than 1 m2/g and a density of 3.2 to 3.4 g/cm3.

17. The method of any of claims 1 and 2, wherein the olivine doped zinc oxide is disposed in a fixed bed reactor.

18. The method of any of claims 1 and 2, further comprising regenerating the olivine doped zinc oxide.

19. The method of claim 18, wherein the olivine doped zinc oxide is regenerated at a reaction temperature of 500 to 800 °C.

20. The method of claim 18, wherein the olivine doped zinc oxide is regenerated at an oxygen concentration of 10 to 20 vol. %.