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US-20260124606-A1 - CATALYST FOR FISCHER-TROPSCH REACTION AND METHOD OF PREPARING THE SAME

US20260124606A1US 20260124606 A1US20260124606 A1US 20260124606A1US-20260124606-A1

Abstract

A catalyst for an FT reaction that converts a mixture of carbon monoxide (CO) and hydrogen (H 2 ) into liquid hydrocarbons comprising a composite carrier containing uniformly dispersed alumina and zeolite and a metal uniformly supported on the composite carrier is proposed. Herein, the metal includes Co. In addition, a method of preparing the catalyst is also proposed.

Inventors

  • Chang Q LEE
  • Ho Jeong LEE
  • Seung Woo Lee
  • Yun Ji LIM

Assignees

  • SK INNOVATION CO., LTD.

Dates

Publication Date
20260507
Application Date
20251020
Priority Date
20241107

Claims (20)

  1. 1 . A catalyst for a Fischer-Tropsch reaction, the catalyst comprising: a composite carrier comprising uniformly dispersed alumina and zeolite; and a metal supported on the composite carrier, wherein the metal comprises Co.
  2. 2 . The catalyst of claim 1 , wherein the catalyst has a composition uniformity of 5.0 or less, as defined by UN in Equation 1 below: UN = ∑ i = 1 i = M ❘ "\[LeftBracketingBar]" C A ⁢ l ( i ) - C A ⁢ l ( ave ) ❘ "\[RightBracketingBar]" M × C Al ( ave ) × 100 , Equation ⁢ 1 , wherein, in Equation 1, UN represents the composition uniformity, C Al represents a composition of alumina with a total content (wt %) of alumina and zeolite as a denominator and an alumina content (wt %) as a numerator, C Al (ave) represents an average composition of alumina on the cross-section of a carrier across the center of the composite carrier, C Al (i) represents a composition of alumina at the i-th numbered location when sequential numbers are assigned to locations spaced at regular intervals along a straight reference line crossing the center of the cross-section of the carrier, and M represents a total number of locations, in which the composition of alumina is measured, on the reference line, and is a natural number from 20 to 500.
  3. 3 . The catalyst of claim 1 , wherein the zeolite has an MRE structure or an MFI structure.
  4. 4 . The catalyst of claim 1 , wherein the zeolite comprises EU-2, ZSM-5, ZSM-48, or a combination thereof.
  5. 5 . The catalyst of claim 1 , wherein a weight ratio of alumina to zeolite in the composite carrier is 1:1 to 1:5.
  6. 6 . The catalyst of claim 1 , wherein a content of the composite carrier in the catalyst is at least 80 wt %.
  7. 7 . The catalyst of claim 1 , wherein the metal further comprises Fe.
  8. 8 . The catalyst of claim 1 , wherein a content of the metal in the catalyst is at least 5 wt %.
  9. 9 . The catalyst of claim 1 , wherein the catalyst further comprises a co-catalyst metal.
  10. 10 . The catalyst of claim 9 , wherein the co-catalyst metal comprises Y, Ce, La, W, Mo, or a combination thereof.
  11. 11 . The catalyst of claim 9 , wherein a content of the co-catalyst metal in the catalyst is at least 1 wt %.
  12. 12 . The catalyst of claim 1 , wherein the catalyst shows a reduction peak at 600° C. or higher, as measured by hydrogen temperature-programmed reduction (H 2 -TPR).
  13. 13 . A method of preparing a catalyst for an FT reaction, the method comprising: preparing a composite carrier mixture comprising alumina hydrate and zeolite; preparing a precursor solution of a Co-containing metal; preparing a catalyst mixture by mixing the composite carrier mixture and the precursor solution; and calcining the catalyst mixture.
  14. 14 . The method of claim 13 , wherein the preparation of the catalyst mixture further comprises adding an acid to the precursor solution.
  15. 15 . The method of claim 13 , wherein the preparation of the catalyst mixture comprises: preparing a paste by mixing the composite carrier mixture and the precursor solution; and preparing an extrudate by extruding the paste, and the calcination of the catalyst mixture means calcining the extrudate.
  16. 16 . A catalyst for a Fischer-Tropsch reaction that converts a mixture of carbon monoxide (CO) and hydrogen (H 2 ) into liquid hydrocarbons, the catalyst comprising: a composite carrier comprising uniformly dispersed alumina and zeolite; and cobalt and iron and a cocatalyst metal on the composite carrier, wherein a content of the co-catalyst metal in the catalyst is at least 1 wt %, and wherein the catalyst shows a reduction peak at 600° C. or higher, as measured by hydrogen temperature-programmed reduction (H 2 -TPR).
  17. 17 . The catalyst of claim 16 , wherein the catalyst has a composition uniformity UN of 5.0 or less, defined by the following equation UN = ∑ i = 1 i = M ❘ "\[LeftBracketingBar]" C A ⁢ l ( i ) - C A ⁢ l ( ave ) ❘ "\[RightBracketingBar]" M × C Al ( ave ) × 100 , wherein, C Al represents a composition of alumina with a total content (wt %) of alumina and zeolite as a denominator and an alumina content (wt %) as a numerator, C Al (ave) represents an average composition of alumina on the cross-section of a carrier across the center of the composite carrier, C Al (i) represents a composition of alumina at the i-th numbered location when sequential numbers are assigned to locations spaced at regular intervals along a straight reference line crossing the center of the cross-section of the carrier, and M represents a total number of locations, in which the composition of alumina is measured, on the reference line, and is a natural number from 20 to 500.
  18. 18 . The catalyst of claim 16 , wherein the zeolite has an MRE structure or an MFI structure.
  19. 19 . The catalyst of claim 16 , wherein a weight ratio of alumina to zeolite in the composite carrier is 1:1 to 1:5.
  20. 20 . The catalyst of claim 16 , wherein a content of the composite carrier in the catalyst is at least 80 wt %.

Description

CROSS REFERENCE TO RELATED APPLICATION The present application claims priority to Korean Patent Application No. 10-2024-0157308, filed Nov. 7, 2024, the entire contents of which is incorporated herein for all purposes by this reference. BACKGROUND OF THE DISCLOSURE 1. Field of the Disclosure The embodiments of the present disclosure relate to a catalyst for Fischer-Tropsch (FT) reaction and a method of preparing the same. 2. Description of the Related Art Synthetic fuel (or synfuel) is generally defined as a hydrocarbon produced through a series of chemical reactions from synthesis gas, which is a mixture of carbon monoxide and hydrogen, to synthesize fuel. Synthetic fuel is distinct from hydrocarbons separated by distillation of crude oil. Among catalytic reactions for synthesizing liquid hydrocarbons from synthesis gas, a FT (Fischer-Tropsch) reaction is a representative example. Jet fuel is fuel used in aircraft engines. Sustainable aviation fuel (SAF) refers to jet fuel made from sustainable and renewable raw materials. The raw materials may be bio-derived raw materials such as seaweed, animals/plants, and cooking oil. Alternatively, the raw materials may be synthetic raw materials prepared using carbon dioxide in the air and hydrogen derived from water. SAF can replace conventional jet fuel without modifying conventional aircraft. SAF can reduce carbon emissions by up to 80% compared to conventional jet fuel prepared based on fossil resources such as oil and coal. Thus, SAF is gaining attention not only from the perspective that SAF can address depletion of conventional fossil resources and rising crude oil prices, but also from the perspective that SAF can help address global warming and reduce carbon dioxide emissions. SUMMARY According to an embodiment of the present disclosure, a new catalyst which may be used in an FT reaction may be provided. According to another embodiment of the present disclosure, a method of preparing the catalyst may be provided. The catalyst of the present disclosure may be widely applied in SAF preparation techniques, and thus the catalyst may also contribute to preventing global warming through reduction in carbon emissions. In an embodiment of the present disclosure, a catalyst for an FT reaction may include a composite carrier including uniformly dispersed alumina (Al2O3) and zeolite; and a metal supported on the composite carrier, and the metal includes Co. According to an embodiment of the present disclosure, the catalyst may have a composition uniformity of 5.0 or less, as defined by UN in Equation 1 below. UN=∑i=1i=M ❘"\[LeftBracketingBar]"CA⁢l(i )-CA⁢l(ave)❘"\[RightBracketingBar]"M×CAl(ave)×100(Equation⁢ 1) In Equation 1, UN represents the composition uniformity. CAl represents a composition of alumina with a total content (wt %) of alumina and zeolite as a denominator and an alumina content (wt %) as a numerator. CAl(ave) represents an average composition of alumina on a cross-section of a carrier across the center of the composite carrier. CAl(i) represents a composition of alumina at the i-th numbered location when sequential numbers are assigned to locations spaced at regular intervals along a straight reference line crossing the center of the cross-section of the carrier. M represents a total number of the locations, where the composition of alumina is measured on the reference line, and is a natural number from 20 to 500. According to an embodiment of the present disclosure, the zeolite may have an MRE structure or an MFI structure. According to an embodiment of the present disclosure, the zeolite may include EU-2, ZSM-5, ZSM-48, or a combination thereof. According to an embodiment of the present disclosure, a weight ratio of the alumina to the zeolite in the composite carrier may be 1:1 to 1:5. According to an embodiment of the present disclosure, a content of the composite carrier in the catalyst may be at least 80 wt %. According to an embodiment of the present disclosure, the metal may further include Fe. According to an embodiment of the present disclosure, a content of the metal in the catalyst may be at least 5 wt %. According to an embodiment of the present disclosure, the catalyst may further include a co-catalyst metal. According to an embodiment of the present disclosure, the co-catalyst metal may include yttrium (Y), cerium (Ce), lanthanum (La), tungsten (W), molybdenum (Mo), or a combination, or a combination thereof. According to an embodiment of the present disclosure, a content of the co-catalyst metal in the catalyst may be at least 1 wt %. According to an embodiment of the present disclosure, the catalyst may show a reduction peak at 600° C. or higher, as measured by hydrogen temperature-programmed reduction (H2-TPR). In another embodiment of the present disclosure, provided is a method of preparing a catalyst for an FT reaction. The method may include preparing a composite carrier mixture including alumina hydrate and zeolite; preparing a