Transition metal salt impregnated carbon
First Claim
Patent Images
1. A process for preparing an activated carbon impregnated with a transition metal salt with enhanced microporosity, comprising:
- (a) impregnating a transition metal salt on a thermally generated pre-char carbon so as to impart approximately 0.5 to 15 weight percent of said transition metal salt on to said pre-char carbon based upon said pre-char carbon after impregnating said transition metal salt; and
(b) pyrolyzing said carbon at a temperature in the range of at least approximately 800°
C. to produce a transition metal salt impregnated activated carbon.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention is a synthesis, product and process for activated carbon and preferably carbon molecular sieve separation of air to produce a nitrogen product wherein a carbon is partially pyrolyzed, impregnated with a transition metal salt and further pyrolyzed to develop enhanced microporosity. The resulting microporous carbon can then be activated with carbon dioxide or steam and then pore-sized by cracking of hydrocarbons on the carbon to produce a carbon molecular sieve.
51 Citations
12 Claims
-
1. A process for preparing an activated carbon impregnated with a transition metal salt with enhanced microporosity, comprising:
-
(a) impregnating a transition metal salt on a thermally generated pre-char carbon so as to impart approximately 0.5 to 15 weight percent of said transition metal salt on to said pre-char carbon based upon said pre-char carbon after impregnating said transition metal salt; and (b) pyrolyzing said carbon at a temperature in the range of at least approximately 800°
C. to produce a transition metal salt impregnated activated carbon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A process for preparing a transition metal salt impregnated carbon molecular sieve adsorbent having enhanced microporosity, comprising:
-
(a) pyrolyzing a carbon in an inert atmosphere at a temperature in the range of approximately 300°
to 600°
C. to partially pyrolyze the carbon to a pre-char carbon;(b) impregnating a solution of a transition metal salt on said partially pyrolyzed pre-char carbon so as to just wet said pre-char carbon to impart an approximately 0.5 to 15 weight percent increase in said pre-char carbon; (c) drying said impregnated pre-char carbon at a temperature no greater than 200°
C.;(d) further pyrolyzing said impregnated pre-char carbon in an inert atmosphere at a temperature in the range of approximately 800°
to 1000°
C. to produce a char;(e) activating said char by heating the char in the presence of an oxidation agent selected from the group consisting of carbon dioxide, air, steam and mixtures thereof; and (f) cracking hydrocarbons on pores of said activated char to restrict the size of said pores in said char to produce a transition metal salt impregnated carbon molecular sieve adsorbent having enhanced microporosity.
-
Specification