Fluidizable alkane dehydrogenation catalyst

Patent metadata

Field	Value
Publication number	US-9914677-B2
Application number	US-201715642666-A
Country	US
Kind code	B2
Filing date	Jul 6, 2017
Priority date	Jul 7, 2015
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

Fluidizable catalysts for oxygen-free oxidative dehydrogenation of alkanes to corresponding olefins. The catalysts contain 10-20% (by weight per total catalyst weight) of one or more vanadium oxides as the catalytic material, which are mounted upon an alumina support that is modified with zirconia at alumina/zirconia ratios of 5:1 up to 1:2. Various methods of preparing and characterizing the fluidizable catalysts are also provided.

First claim

The invention claimed is:

1. A fluidizable alkane dehydrogenation catalyst comprising:
a zirconia-modified γ-Al 2 O 3 support material; and
10-20% of one or more vanadium oxides by weight based on a total weight of the alkane dehydrogenation fluidizable catalyst, the one or more vanadium oxides being adsorbed onto the support material;
wherein the support material comprises an γ-Al 2 O 3 /zirconia weight ratio of 1-5:1-3; and
wherein the alkane dehydrogenation fluidizable catalyst has an average particle size of 40-120 μm.

2. The fluidizable alkane dehydrogenation catalyst of claim 1 , wherein the one or more vanadium oxides are selected from the group consisting of V 2 O 5 , VO 2 and V 2 O 3 .

3. The fluidizable alkane dehydrogenation catalyst of claim 2 , comprising at least 50% of V 2 O 5 based on total weight of the one or more vanadium oxides.

4. The fluidizable alkane dehydrogenation catalyst of claim 1 , wherein the γ-Al 2 O 3 /zirconia weight ratio is 1-2:1.

5. The fluidizable alkane dehydrogenation catalyst of claim 1 , wherein the one or more vanadium oxides form a crystalline phase on the surface of the zirconia-modified γ-Al 2 Q 3 support material.

6. The fluidizable alkane dehydrogenation catalyst of claim 1 , having an apparent particle density of 1.5-3.5 g/cm 3 .

7. The fluidizable alkane dehydrogenation catalyst of claim 1 , having Class B powder properties in accordance with Geldart particle classification.

8. The fluidizable alkane dehydrogenation catalyst of claim 1 , wherein the zirconia present in the γ-Al 2 O 3 /zirconia ratio depresses the surface acidity of the alkane dehydrogenation fluidizable catalyst.

9. The fluidizable alkane dehydrogenation catalyst of claim 1 , wherein the zirconia present in the γ-Al 2 O 3 /zirconia ratio enhances the interaction between the one or more vanadium oxides and the support material.

10. The fluidizable alkane dehydrogenation catalyst of claim 1 , wherein the zirconia present in the γ-Al 2 O 3 /zirconia ratio enhances the reducibility of the one or more vanadium oxides.

11. A fluidizable alkane dehydrogenation catalyst comprising:
a zirconia-modified γ-Al 2 O 3 support material; and
10-20% of one or more vanadium oxides by weight based on a total weight of the alkane dehydrogenation fluidizable catalyst, the one or more vanadium oxides being adsorbed onto the support material;
wherein the support material comprises an γ-Al 2 O 3 /zirconia weight ratio of 1-5:1-3; and
wherein the alkane dehydrogenation fluidizable catalyst is in the form of a plurality of particles and more than 75% of the particles have a particle size of 40-120 μm.

12. A fluidizable alkane dehydrogenation catalyst, comprising:
a zirconia-modified γ-Al 2 O 3 support material; and
10-20% of one or more vanadium oxides by weight based on a total weight of the alkane dehydrogenation fluidizable catalyst, the one or more vanadium oxides being adsorbed onto the support material;
wherein the support material comprises an γ-Al 2 O 3 /zirconia weight ratio of 1-5:1-3; and
wherein the alkane dehydrogenation fluidizable catalyst has a BET surface area of 10-50 m 2 /g.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Hossain Mohammad Mozahar
• Elbadawi Abdalwadood Hassan
• Ba-Shammakh Mohammed Saleh
• Razzak Shaikh Abdur

Classifications

• C07C5/3332 Primary

  with metal oxides or metal sulfides · CPC title

• C07C2521/06

  Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof · CPC title

• B01J23/22

  Vanadium · CPC title

• B01J21/06

  Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof · CPC title

• C07C2521/04

  Alumina · CPC title