Alumina catalysts support manufacture
AssigneeCarnegie Mellon University
InventorsDavid A. Dzombak, Cynthia R. Evanko
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Abstract
Disclosed is a process for providing an improved catalyst support comprising the steps of providing a dispersion of alumina in water, the dispersion maintained under acidic conditions; adding a stabilizing agent to said dispersion, the stabilizing agent capable of stabilizing said dispersion and inhibiting gellation thereof, the stabilizing agent having the formula: ##STR1##
Claims24
A process for providing an improved catalyst support comprising the steps of:
- (a) providing a dispersion of alumina in water, the dispersion maintained under acidic conditions;
- (b) adding a stabilizing agent to said dispersion, the stabilizing agent capable of stabilizing said dispersion and inhibiting gellation thereof, the stabilizing agent having the formula:
- ##STR11## wherein:
- X is selected from O (oxygen), S (sulfur), or NR.sub.1 wherein N is nitrogen;
- Z.sub.2 are the atoms necessary to complete a substituted or unsubstituted aryl, carbocyclic or heterocyclic ring;
- R and R.sub.1 are C.sub.y H.sub.2y+1, wherein y is an integer from 6 to 16, inclusive, and are branched or unbranched, substituted or unsubstituted;
- s and t are individually 0, 1, 2, 3, or 4, wherein at least one of s and t is 1;
- n and m are individually 0 or 1;
- and
- M.sub.a and M.sub.b are selected from mono, di, or trivalent metal atoms or hydrogen;
- (c) extruding said stabilized dispersion to provide an extrudate;
- (d) drying said extrudate;
- and
- (e) firing said dried extrudate to remove the stabilizing agent and to activate said dried extrudate to provide said catalyst support.
A process for providing an improved catalyst support comprising the steps of:
- (a) providing a dispersion of alumina in water, the dispersion maintained under acidic conditions;
- (b) adding a stabilizing agent to said dispersion, the stabilizing agent capable of stabilizing said dispersion and inhibiting gellation thereof, the stabilizing agent having the formula:
- ##STR18## wherein R is C.sub.y H.sub.2y+1 ;
- (c) extruding said stabilized dispersion to provide an extrudate;
- (d) drying said extrudate;
- and
- (e) firing said dried extrudate to remove the stabilizing agent and to activate said dried extrudate to provide said catalyst support.
A process for providing a stabilized alumina dispersion suitable for producing an alumina catalyst support by
- (a) extruding said stabilized dispersion to provide an extrudate;
- (b) drying said extrudate;
- (c) firing said dried extrudate to activate said dried extrudate to provide said catalyst support;
- said stabilized alumina dispersion produced by
- (d) providing a dispersion of alumina in water, the dispersion maintained under acidic conditions;
- and
- (e) adding a stabilizing agent to said dispersion, the stabilizing agent capable of stabilizing said dispersion and inhibiting gellation thereof, the stabilizing agent having the formula:
- ##STR19## wherein:
- X is selected from O (oxygen), S (sulfur), or NR.sub.1 wherein N is nitrogen;
- Z.sub.2 are the atoms necessary to complete a substituted or unsubstituted aryl, carbocyclic or heterocyclic ring;
- R and R.sub.1 are C.sub.y H.sub.2y+1 , wherein y is an integer from 6 to 16, inclusive, and are branched or unbranched, substituted or unsubstituted;
- s and t are individually 0, 1, 2, 3, or 4, wherein at least one of s and t is 1;
- n and m are individually 0 or 1;
- and
- M.sub.a and M.sub.b are selected from mono, di, or trivalent metal atoms or hydrogen.
A process for providing a stabilized alumina dispersion suitable for producing an alumina catalyst support by
- (a) extruding said stabilized dispersion to provide an extrudate;
- (b) drying said extrudate;
- (c) firing said dried extrudate to activate said dried extrudate to provide said catalyst support;
- said stabilized alumina dispersion produced by
- (d) providing a dispersion of alumina in water, the dispersion maintained under acidic conditions;
- (e) adding a stabilizing agent to said dispersion, the stabilizing agent capable of stabilizing said dispersion and inhibiting gellation thereof, the stabilizing agent having the formula:
- ##STR20## wherein R is C.sub.y H.sub.2y+1.
A process to stabilize and/or inhibit gellation of a water dispersion of alumina to provide a stabilized alumina dispersion, the process comprising the steps of:
- (a) providing a dispersion of alumina in water, the dispersion maintained under acidic conditions;
- (b) adding a stabilizing agent to said dispersion, the stabilizing agent capable of stabilizing and/or inhibiting gellation of said dispersion and having the formula:
- ##STR21## wherein:
- X is selected from O (oxygen), S (sulfur), or NR.sub.1 wherein N is nitrogen;
- Z.sub.2 are the atoms necessary to complete a substituted or unsubstituted aryl, carbocyclic or heterocyclic ring;
- R and R.sub.1 are C.sub.y H.sub.2y+1, wherein y is an integer from 6 to 16, inclusive, and are branched or unbranched, substituted or unsubstituted;
- s and t are individually 0, 1, 2, 3, or 4, wherein at least one of s and t is 1;
- and
- n and m are individually 0 or 1;
- and
- M.sub.a and M.sub.b are selected from mono, di, or trivalent metal atoms or hydrogen.
A process to stabilize and/or inhibit gellation of a water dispersion of alumina, the dispersion suitable for forming into a catalyst support comprising the steps of:
- (a) providing a dispersion of alumina in water, the dispersion maintained at a pH in the range of 3 to 6;
- (b) adding a stabilizing agent to said dispersion, the stabilizing agent capable of stabilizing and/or inhibiting gellation of said dispersion and having the formula:
- ##STR22## wherein:
- R is C.sub.y H.sub.2y+1, and
- y is an integer from 6 to 16, inclusive, and may be branched or unbranched, substituted or unsubstituted.
Dependencies are inferred from the claim text.