Base metal dewaxing catalyst

Patent metadata

Field	Value
Publication number	US-10669491-B2
Application number	US-201615364869-A
Country	US
Kind code	B2
Filing date	Nov 30, 2016
Priority date	Dec 21, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

Methods are provided for making base metal catalysts with improved activity. After forming catalyst particles based on a support comprising a zeolitic molecular sieve, the catalyst particles can be impregnated with a solution comprising a) metal salts (or other precursors) for a plurality of base metals and b) an organic dispersion agent comprising 2 to 10 carbons. The impregnated support particles can be dried to form a base metal catalyst, and then optionally sulfided to form a sulfided base metal catalyst. The resulting (sulfided) base metal catalyst can have improved activity for cloud point reduction and/or for improved activity for heteroatom removal, relative to a base metal dewaxing catalyst prepared without the use of a dispersion agent.

First claim

The invention claimed is:

1. A method of forming a dewaxing catalyst, the method comprising:
impregnating a support comprising about 30 wt % to about 100 wt % of a zeolitic molecular sieve, based on the total weight of the support, with a solution comprising a Group 6 metal salt, a Group 8-10 non-noble metal salt, and a dispersion agent, the dispersion agent comprising a compound having 2-10 carbon atoms and a carbon atom to oxygen atom ratio of about 0.6 to about 2.0; and
drying the impregnated support at a temperature of about 80° C. to about 200° C. to form a dewaxing catalyst.

2. The method of claim 1 , wherein the zeolitic molecular sieve comprises a zeolite.

3. The method of claim 1 , wherein the zeolitic molecular sieve comprises ZSM-48, ZSM-11, a molecular sieve having a 10-member ring as a largest pore channel, or a combination thereof.

4. The method of claim 1 , wherein the Group 8-10 non-noble metal salt comprises an Ni salt, a Co salt, or a combination thereof; and wherein the Group 6 metal salt comprises a Mo salt, a W salt, or a combination thereof.

5. The method of claim 1 , wherein a molar ratio of dispersion agent to total metals in the solution is about 0.1 to about 5.0; or wherein a molar ratio of dispersion agent to Group 8-10 non-noble metal is 0.5 to 10; or a combination thereof.

6. The method of claim 1 , further comprising sulfiding the dried impregnated support under effective sulfiding conditions to form a sulfided dewaxing catalyst, the sulfiding optionally being performed without prior calcining of the dried impregnated support.

7. The method of claim 1 , wherein the dispersion agent comprises a glycol, a carboxylic acid, or a combination thereof.

8. The method of claim 1 , wherein impregnating the support comprising a zeolitic molecular sieve comprises impregnating a support comprising a bound zeolitic molecular sieve, the support optionally comprising an alumina binder.

9. The method of claim 8 , wherein the support comprises a binder having a surface area of about 150 m 2 /g or less.

10. The method of claim 1 , wherein the dispersion agent comprises citric acid, an organic acid having at least 5 carbon atoms, or a combination thereof.

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Mccarthy Stephen J
• Bai Chuansheng
• Lai Wenyih Frank
• Podsiadlo Paul
• Lonergan William W

Classifications

• B01J2229/186

  not in framework positions · CPC title

• B01J29/46

  Iron group metals or copper · CPC title

• B01J37/30

  Ion-exchange · CPC title

• C10G47/04

  Oxides · CPC title

• B01J29/48

  containing arsenic, antimony, bismuth, vanadium, niobium tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium · CPC title