Two powder synthesis of hydrotalcite-like compounds with divalent or polyvalent organic anions
AssigneeAluminum Company of America
InventorsEdward S. Martin, John M. Stinson, Vito Cedro, III, William E. Horn, Jr.
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Abstract
There is provided a method for making a divalent or polyvalent organic anion-intercalated hydrotalcite-like materials by first reacting a magnesium-containing powder and a transition alumina powder in an aqueous suspension to form a meixnerite intermediate. This intermediate is then contacted with a dicarboxylate or polycarboxylate anion to form a hydrotalcite-like material. The latter is then separated from the suspension. Representative materials include an oxalate-, succinate- or terephthalate-intercalated hydrotalcite-like material.
Claims47
A method for making a layered double hydroxide with at least one dicarboxylate or polycarboxylate anion intercalated therein, said layered double hydroxide having the formula:
- A.sub.1-x B.sub.x (OH).sub.2 C.sub.z.mH.sub.2 O, where A represents a divalent metal cation, B represents a trivalent metal cation, C represents a mono- to polyvalent anion, and x, z and m satisfy the following conditions:
- 0.09<x<0.67;
- z=x/n, where n=the charge on the anion;
- and 2>m>0.5, said method comprising:
- (a) reacting at least one divalent metal compound and at least one trivalent metal oxide powder in an aqueous suspension to form a double hydroxide intermediate containing said divalent metal and said trivalent metal;
- (b) contacting the double hydroxide intermediate with a divalent or polyvalent organic anion to make an intercalated layered double hydroxide;
- and
- (c) separating said intercalated layered double hydroxide from the suspension.
A method for making a divalent or polyvalent organic anion-intercalated hydrotalcite-like material, said method comprising:
- (a) reacting a magnesium-containing powder and a transition alumina powder in an aqueous suspension to form a meixnerite intermediate;
- (b) contacting the meixnerite intermediate with a dicarboxylate or polycarboxylate anion to make a hydrotalcite-like material;
- and
- (c) separating the intercalated hydrotalcite-like material from the suspension.
A method for making an oxalate-containing, hydrotalcite-like compound comprises:
- (a) reacting a magnesium-containing powder and a transition alumina powder in an aqueous suspension to form a meixnerite intermediate;
- (b) contacting the meixnerite intermediate with an excess of oxalate ions to form an oxalate-containing, hydrotalcite-like compound;
- and
- (c) separating the hydrotalcite-like compound from the suspension.
A method for making a layered double hydroxide with at least one dicarboxylate or polycarboxylate anion intercalated therein, said method comprising:
- (a) reacting meixnerite with a divalent or polyvalent organic anion to make an intercalated layered double hydroxide;
- and
- (b) separating said intercalated layered double hydroxide from the suspension.
Dependencies are inferred from the claim text.