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1. WO2020110151 - CATALYST, ITS PROCESS OF PREPARATION, AND APPLICATIONS TOWARDS CARBON DIOXIDE TO CHEMICALS

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[ EN ]

WO 2020/110151 AMENDED CLAIMS PCT/IN2019/050873 received by the International Bureau on 12 May 2020 (12.05.2020)

I/We Claim:

1. A catalyst comprising at least one group 10 metal impregnated in a mixed metal oxide, wherein the mixed metal oxide is a combination of I Or, CuO, ZnO, ZrC>2, and AI2O3.

2. The catalyst as claimed in claim 1 , wherein the I Ch has weight percentage in the range of 1 -5% with respect to the total catalyst; CuO has a weight percentage in the range of 50 - 59% with respect to the total catalyst; ZnO has a weight percentage in the range of 10-20% with respect to the total catalyst; Zr02 has a weight percentage in the range of 5-10 % with respect to the total catalyst; and AI2O3 has a weight percentage in the range of 5-10 % with respect to the total catalyst.

3. The catalyst as claimed in claim 1, wherein the at least one group 10 metal is Pd having a weight percentage in the range of 0.1-2 % with respect to the catalyst.

4. The catalyst as claimed in claim 1 has a specific area in the range of 25-50 m2/g.

5. A process of preparation of catalyst as claimed in claim 1, the process comprising:

(a) contacting at least one metallic nitrate selected from the group consisting of indium nitrate, copper nitrate, zinc nitrate, zirconium nitrate, aluminum nitrate, and combinations thereof, and deionized water to obtain first solution;

(b) contacting at least one precipitating agent, and deionized water to obtain a second solution;

(c) contacting the first solution, and the second solution to obtain a first reaction mixture;

(d) processing the first reaction mixture to obtain a mixed metal oxide;

(e) contacting the mixed metal oxide and an aqueous solution of palladium nitrate to obtain a third solution;

(f) processing the third solution to obtain the catalyst.

6. The process as claimed in claim 5, wherein the at least one precipitating agent is selected from the group consisting of sodium carbonate, potassium carbonate, ammonium carbonate and sodium hydrogen carbonate, and combinations thereof.

7. The process as claimed in claim 5, wherein contacting the first solution, and the second solution is carried out at a temperature in the range of 50 - 90 °C for a period in the range of 40-50 minutes to obtain a first reaction mixture.

8. The process as claimed in claim 5, wherein processing the first reaction mixture comprises processes selected from the group consisting of ageing, filtering, washing, drying, calcining, and combinations thereof to obtain the mixed metal oxide.

9. The process as claimed in claim 5, wherein processing the third solution comprises processes selected from the group consisting of stirring, sonication, drying, calcination, extrusion, and combinations thereof.

10. The process as claimed in any one of the claims 8 or 9, wherein calcination is carried out at a temperature in the range of 300 - 450 °C at heating rates between 2-5 °C /minute.

11. Use of the catalyst as claimed in any one of the claims 1-4, for thermochemical CO2 reduction.

12. A catalyst as claimed in in any one of the claims 1-4, for use in thermochemical CO2 reduction.

13. A process for thermochemical CO2 reduction, the process comprising:

(a) activating the catalyst as claimed in claim 1 in a hydrogen stream to obtain an activated catalyst; and

(b) contacting H2, CO2 and the activated catalyst at a reaction temperature in the range of 200 °C to 300 °C under a reaction pressure of 30-60 bar with a space velocity of 1000-7200 h— 1 to thermochemically reduce CO2.

14. The process as claimed in claim 13, provides a conversion efficiency of CO2 in the range of 25-38%.