Iron-based catalyst, method for preparing the same, and method for producing alpha-olefins using the same

Patent metadata

Field	Value
Publication number	US-10266776-B2
Application number	US-201615299441-A
Country	US
Kind code	B2
Filing date	Oct 20, 2016
Priority date	Apr 21, 2014
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A catalyst including between 50.0 and 99.8 percent by weight of iron, between 0 and 5.0 percent by weight of a first additive, between 0 and 10 percent by weight of a second additive, and a carrier. The first additive is ruthenium, platinum, copper, cobalt, zinc, or a metal oxide thereof. The second additive is lanthanum oxide, cerium oxide, magnesium oxide, aluminum oxide, silicon dioxide, potassium oxide, manganese oxide, or zirconium oxide.

First claim

The invention claimed is:

1. A method for preparing a catalyst, the method comprising:
1) mixing anhydrous ferric nitrate, a nitrate of a first additive, and amorphous silicon dioxide with n-octanol to form a first solution, wherein a total weight percentage of the anhydrous ferric nitrate, the nitrate of the first additive, and the amorphous silicon dioxide in the first solution is between 3 wt. % and 20 wt. %; stirring and heating the first solution to a temperature of between 140 and 180° C. for 4 hrs to yield a heated first solution; cooling and filtering the heated first solution to yield a first product; drying the first product to yield a black solid; grinding the black solid for 20 to 40 mins to yield a ground black solid, then roasting the ground black solid for 5 hrs at between 400 and 600° C. to yield a catalyst precursor; and
2) dissolving a precursor of a second additive in water or ethyl alcohol to form a second solution; performing dry impregnation by adding the second solution to the catalyst precursor to yield an impregnated catalyst precursor; conducting an aging treatment of the impregnated catalyst precursor for between 12 and 24 hrs to form a second product; drying the second product at a temperature of between 100 and 130° C. to yield a dried second product, and roasting the dried second product for 4 to 10 hrs at a temperature of between 300 and 1200° C. to yield a roasted second product; and tableting and sieving the roasted second product to yield the catalyst;

wherein:
the catalyst comprises, by a total weight of the catalyst, between 50.0 and 99.8 percent by weight of iron, between 0 and 5.0 percent by weight of the first additive, between 0 and 10 percent by weight of the second additive, and a carrier;
the first additive is ruthenium, platinum, copper, cobalt, or zinc, or the first additive is a metal oxide selected from oxides of ruthenium, platinum, copper, cobalt, and zinc;
the second additive is lanthanum oxide, cerium oxide, magnesium oxide, aluminum oxide, potassium oxide, manganese oxide, or zirconium oxide; and
the carrier is silicon dioxide.

2. The method of claim 1 , wherein the catalyst comprises between 1 and 40 percent by weight of the carrier, between 1 and 2 percent by weight of the first additive, between 2 and 6 percent by weight of the second additive, and the rest is the iron.

3. The method of claim 1 , wherein total weight percentage of the anhydrous ferric nitrate, the nitrate of the first additive, and the amorphous silicon dioxide in the first solution is between 5 wt. % and 15 wt. %.

4. The method of claim 2 , wherein total weight percentage of the anhydrous ferric nitrate, the nitrate of the first additive, and the amorphous silicon dioxide in the first solution is between 5 wt. % and 15 wt. %.

5. The method of claim 1 , wherein a particle size of the catalyst precursor is between 50 and 60 nm; and the catalyst precursor is spherical and monodispersed.

6. The method of claim 2 , wherein a particle size of the catalyst precursor is between 50 and 60 nm; and the catalyst precursor is spherical and monodispersed.

7. The method of claim 3 , wherein a particle size of the catalyst precursor is between 50 and 60 nm; and the catalyst precursor is spherical and monodispersed.

8. The method of claim 7 , wherein a particle size of the catalyst precursor is between 50 and 60 nm; and the catalyst precursor is spherical and monodispersed.

9. The method of claim 1 , wherein in 2), the precursor of the second additive is K 2 CO 3 , Zr(NO 3 ) 4 , or Al(NO 3 ) 3 .

Assignees

• Wuhan Kaidi Eng Tech Res Inst

Inventors

• Chen Yilong
• Zhang Yanfeng
• Chen Jiangang
• Song Dechen
• Zhang Juan
• Sun Taomei

Classifications

• B01J35/08

  Operations & Transport · mapped topic

• B01J23/80

  with zinc, cadmium or mercury · CPC title

• C10G2/00

  Production of liquid hydrocarbon mixtures of undefined composition from oxides of carbon · CPC title

• B01J23/8906

  Iron and noble metals · CPC title

• C10G2/333

  of the platinum-group · CPC title