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US 5,516,743 AGranted
Alumina catalyst support preparation
AssigneeCarnegie Mellon University
InventorsDavid A. Dzombak, Cynthia R. Evanko
Life of this patent
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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; and 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##
Claims22
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:
- ##STR10## wherein W.sub.1 and W.sub.2 are selected from O (oxygen), S (sulfur), or N (nitrogen);
- R.sub.1 is selected from hydrogen, substituted or unsubstituted alkyl and is branched or unbranched, substituted or unsubstituted aryl, nitro, chloro, bromo, methoxy, sulfonamido, sulfamoyl, carbonamido, carbamoyl, substituted or unsubstituted aryl, and the substituted alkyl or aryl may contain one or more of the above substituents;
- R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 are selected from hydrogen or alkyl containing 1-20 carbon atoms;
- a is an integer selected from 0, 1, 2, 3, or 4;
- b is an integer selected from 0 or 1, and when b is 0 then C.sub.x H.sub.2x+1 is attached directly to W.sub.1 ;
- c is an integer selected from 1 through 20;
- x is an integer selected from 1 through 30 and C.sub.x H.sub.2x+1 is branched or unbranched;
- and
- M.sub.1 is selected from hydrogen, ammonium, or a mono-, di-, or trivalent metal atom;
- (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.
12 more elements
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:
- ##STR16## wherein c is an integer selected from 1 through 20;
- x is an integer selected from 1 through 30 and C.sub.x H.sub.2x+1 is branched or unbranched;
- and
- M.sub.1 is selected from hydrogen, ammonium, or a mono-, di-, or trivalent metal atom;
- (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.
7 more elements
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:
- ##STR17## wherein W.sub.1 and W.sub.2 are selected from O (oxygen), S (sulfur), or N (nitrogen);
- R.sub.1 is selected from hydrogen, substituted or unsubstituted alkyl and is branched or unbranched, substituted or unsubstituted aryl, nitro, chloro, bromo, methoxy, sulfonamido, sulfamoyl, carbonamido, carbamoyl, substituted or unsubstituted aryl;
- R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.77 are selected from hydrogen or alkyl containing 1-20 carbon atoms;
- a is an integer selected from 0, 1, 2, 3, or 4;
- b is an integer selected from 0 or 1, and when b is 0 then C.sub.x H.sub.2x+1 is attached directly to W.sub.1 ;
- c is an integer selected from 1 through 20;
- x is an integer selected from 1 through 30 and C.sub.x H.sub.2x+1 is branched or unbranched;
- and
- M.sub.1 is selected from hydrogen, ammonium, or a mono-, di-, or trivalent metal atom.
13 more elements
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 c is an integer selected from 1 through 20;
- x is an integer selected from 1 through 30 and C.sub.x H.sub.2x+1 is branched or unbranched;
- and
- M.sub.1 is selected from hydrogen, ammonium, or a mono-, di-, or trivalent metal atom.
8 more elements
A process to stabilize and/or inhibit gellation of a water dispersion of alumina 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:
- ##STR20## wherein W.sub.1 and W.sub.2 are selected from O (oxygen), S (sulfur), or N (nitrogen);
- R.sub.1 is selected from hydrogen, substituted or unsubstituted alkyl and is branched or unbranched, substituted or unsubstituted aryl, nitro, chloro, bromo, methoxy, sulfonamido, sulfamoyl, carbonamido, carbamoyl, substituted or unsubstituted aryl;
- R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 are selected from hydrogen or alkyl containing 1-20;
- a is an integer selected from 0, 1, 2, 3, or 4;
- b is an integer selected from 0 or 1, and when b is 0 then C.sub.x H.sub.2x+1 is attached directly to W.sub.1 ;
- c is an integer selected from 1 through 20;
- x is an integer selected from 1 through 30 and C.sub.x H.sub.2x+1 is branched or unbranched;
- and
- M.sub.1 is selected from hydrogen, ammonium, or a mono-, di-, or trivalent metal atom.
8 more elements
A process to stabilize and/or inhibit gellation of a water dispersion of alumina 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 c is an integer selected from 1 through 20;
- x is an integer selected from 1 through 30 and C.sub.x H.sub.2x+1 is branched or unbranched;
- and
- M.sub.1 is selected from hydrogen, ammonium, or a mono-, di-, or trivalent metal atom.
3 more elements
Dependencies are inferred from the claim text.