Thermally stable coprecipitated catalysts useful for methanation and other reactions
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-021/04
B01J-023/06
B01J-023/72
B01J-023/74
출원번호
US-0621769
(1975-10-14)
발명자
/ 주소
Hansford Rowland C. (Yorba Linda CA)
출원인 / 주소
Union Oil Company of California (Los Angeles CA 02)
인용정보
피인용 횟수 :
35인용 특허 :
0
초록▼
Catalysts having a high degree of thermal stability, comprising alumina and one or more of the metals iron, cobalt, nickel, copper and zinc, are prepared from aqueous solutions containing a dissolved aluminum salt, a salt of at least one of the aforesaid metals in divalent form, and a delayed precip
Catalysts having a high degree of thermal stability, comprising alumina and one or more of the metals iron, cobalt, nickel, copper and zinc, are prepared from aqueous solutions containing a dissolved aluminum salt, a salt of at least one of the aforesaid metals in divalent form, and a delayed precipitant such as urea. With all components in homogeneous solution at a relatively low pH and temperature, the solution is heated to a temperature sufficient to hydrolyze the delayed precipitant with resultant liberation of ammonia and carbon dioxide homogeneously throughout the solution, until the pH of the solution rises sufficiently to effect coprecipitation of the metal salts as hydroxides and/or carbonates. The resulting coprecipitate is then recovered, washed, dried, shaped and calcined in conventional fashion to obtain a final product which is very active, and displays much greater thermal stability than corresponding prior art catalysts prepared by non-homogeneous coprecipitation with alkaline, ionic reagents such as sodium carbonate, ammonium hydroxide, or ammonium carbonate. The nickel-containing catalysts are particularly useful for methanation, but they are all useful in a variety of other reactions.
대표청구항▼
A method for the manufacture of a composite catalyst comprising about 20-95 wt.% of alumina and about 5-80 wt.% of an oxide or oxides of at least one active divalent metal selected from the class consisting of iron, cobalt, nickel, copper and zinc, which comprises: 1. forming at a relatively low tem
A method for the manufacture of a composite catalyst comprising about 20-95 wt.% of alumina and about 5-80 wt.% of an oxide or oxides of at least one active divalent metal selected from the class consisting of iron, cobalt, nickel, copper and zinc, which comprises: 1. forming at a relatively low temperature a homogeneous aqueous solution of an aluminum salt, a salt or salts of at least one of said active metals, and a delayed precipitant, said delayed precipitant being a water-soluble compound which, at said relatively low temperature, does not bring about any significant precipitation of the metal salts dissolved in said solution, but which will hydrolyze at a relatively higher temperature to form ammonia and carbon dioxide; 2. heating said aqueous solution to a sufficiently high temperature and for a sufficient time to bring about hydrolysis of said delayed precipitant with resultant gradual increase in pH of said solution, and formation of a homogeneous coprecipitate of basic compounds of aluminum and of the divalent metal content of said solution; 3. separating said coprecipitate from said solution before the latter reaches a pH above about 8; and 4. drying and calcining said coprecipitate.
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