Process for catalytic co2 desorption and catalyst for said process

Patent metadata

Field	Value
Publication number	US-2025041831-A1
Application number	US-202218718119-A
Country	US
Kind code	A1
Filing date	Dec 22, 2022
Priority date	Dec 23, 2021
Publication date	Feb 6, 2025
Grant date	—

Abstract

The present invention relates to a process for CO 2 desorption in an overall CO 2 absorption/desorption procedure. The present invention in particular relates to a process and a system for the catalytic CO 2 desorption steps, in the presence of at least one Zr-based catalyst. The present invention also relates to a suitable Zr-based catalyst for the CO 2 desorption process, and to methods for preparing such a catalyst.

First claim

1 - 15 . (canceled)

16 . A method for preparing a Zr-based catalyst for CO 2 desorption, the method comprising the steps of:
mixing a solution comprising a basic precipitating agent into a solution comprising a Zr source, thereby preparing a synthesis solution; and, precipitating the Zr-based catalyst from the synthesis solution, thereby obtaining a precipitated Zr-based catalyst;
characterized in that the pH of the synthesis solution is at least 4 and at most 7, for example about 5; and in that the Zr-based catalyst comprises Zr, O, and H, wherein the O:Zr atomic ratio is at least 2.1; and wherein the precipitated Zr-based catalyst comprises at least 90% by weight ZrO(OH) 2 compared to the total weight of the precipitated Zr-based catalyst.

17 . The method according to claim 16 , wherein the Zr-based catalyst comprises ZrO(OH) 2 , and wherein the ratio of acidic OH to basic OH of the Zr-based catalyst is at least 0.1 and at most 1.3.

18 . The method according to claim 16 , wherein the precipitated Zr-based catalyst comprises at least 95% by weight ZrO(OH) 2 compared to the total weight of the precipitated Zr-based catalyst.

19 . The method according to claim 16 , wherein the basic precipitating agent is a hydroxide; and/or wherein the Zr source is ZrO(NO 3 ) 2 .

20 . The method according to claim 16 , further comprising the additional step of:
calcining the precipitated Zr-based catalyst at a calcination temperature Tc;
wherein the calcination temperature Tc is at most 300° C.

21 . A Zr-based catalyst for CO 2 desorption, prepared using the method according to claim 16 , wherein the O:Zr atomic ratio is at least 2.1; preferably wherein the Zr-based catalyst comprises ZrO(OH) 2 ; and wherein the Zr-based catalyst comprises at least 90% by weight ZrO(OH) 2 compared to the total weight of the Zr-based catalyst.

22 . The Zr-based catalyst according to claim 21 , wherein the ratio of acidic OH to basic OH of the Zr-based catalyst is at least 0.1 and at most 1.3.

23 . The Zr-based catalyst according to claim 21 , wherein the Zr-based catalyst has a surface charge Zeta potential of at least −25 mV, preferably at least −5 mV.

24 . The Zr-based catalyst according to claim 21 , wherein the Zr-based catalyst comprises other metals selected from the group comprising: Hf, Ce, or Zn; preferably wherein the purity of Zr compared to the other metals in the Zr-based catalyst is at least 90%.

25 . A process for CO 2 desorption from an amine solvent, the process comprising the steps of:
providing an CO 2 -containing amine solution comprising CO 2 absorbed in an amine solvent; supplying a Zr-based catalyst according to claim 21 to the CO 2 -containing amine solution; heating the amine solution comprising the Zr-based catalyst to a desorption temperature Td; and, desorbing CO 2 from the amine solution comprising the Zr-based catalyst during a residence time.

26 . The process according to claim 25 , wherein the Zr-based catalyst acts as a non-solubilized heterogeneous catalyst.

27 . The process according to claim 25 , wherein the amine solvent comprises monoethanolamine (MEA) or 2-amino-2-methyl-1-propanol (AMP), preferably monoethanolamine (MEA).

28 . The process according to claim 25 , wherein the residence time is at least 4 h and at most 168 h, preferably at least 20 h and at most 36 h.

29 . A process for CO 2 absorption and desorption, comprising the steps of:
absorbing CO 2 in an amine solvent, thereby obtaining a CO 2 -containing amine solution; and, desorbing CO 2 from the CO 2 -containing amine solution using the process of claim 25 , thereby regenerating the amine solvent.

30 . Use of a Zr-based catalyst in the process according to claim 25 .

Assignees

• Totalenergies Onetech

Inventors

• Kumar Parveen
• Lacroix Maxime
• Sels Bert
• Zhou Cheng
• Liao Yuhe

Classifications

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J37/031

  Precipitation · CPC title

• B01J23/10

  of rare earths · CPC title

• B01J23/06

  of zinc, cadmium or mercury · CPC title

• B01D2257/504

  Carbon dioxide · CPC title