Catalyst and method of making a precursor for the catalyst
AssigneeDyson Refractories Limited
InventorRodney M. Sambrook
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Abstract
A CO shift catalyst comprises the calcined form of a precursor of the approximate formula, the precursor having a layer structure (Cu+Zn).sub.6 Al.sub.x R.sub.y (CO.sub.3).sub.(x+y/2 OH.sub.12+2(x+Y) nH.sub.2 O where R is lanthanum, cerium or zirconium x is not less than 1 and not greater than 4; y is not less than 0.01 and not greater than 1.5 n is approximately 4.
Claims18
A catalyst comprising the calcined form of a precursor, the precursor comprising copper, zinc and aluminum wherein the precursor is of the approximate formula,
- (Cu+Zn).sub.6 Al.sub.x R.sub.y (CO.sub.3).sub.(x+y)/2 OH.sub.12+2(x+y) nH.sub.2 O
- where
- R is lanthanum, cerium or zirconium
- x is in the range of 1.5 to 3;
- y is not less than 0.01 and not greater than 1.5
- n is approximately 4 and has a hydrotalcite layer structure.
A method of making a precursor for catalyst, said precursor being of the approximate formula,
- (Cu+Zn).sub.6 Al.sub.x R.sub.y (CO.sub.3).sub.(x+y)/2 OH.sub.12+2(x+y) nH.sub.2 O
- where
- R is lanthanum, cerium or zirconium
- x is in the range of 1.5 to 3;
- y is not less than 0.01 and not greater than 1.5
- n is approximately 4 and having a layer structure, said method comprising causing co-precipitation from corresponding salt solutions of Cu, Zn, Al and the R element at substantially constant pH and temperature by the addition of alkalis.
A method of making a precursor for catalyst, said precursor being of the approximate formula,
- (Cu+Zn).sub.6 Al.sub.x R.sub.y (CO.sub.3).sub.(x+y)/2 OH.sub.12+2(x+y) nH.sub.2 O
- where
- R is lanthanum, cerium or zirconium
- x is in the range of 1.5 to 3;
- y is not less than 0.01 and not greater than 1.5
- n is approximately 4 and having a hydrotalcite layer structure, said method comprising introducing a solution of salts of the Cu, Zn, Al and R, and a hydrolysable material into the pores of a preformed body of low surface area ceramic matrix, and heating the body to a temperature to bring about controlled hydrolysis of the hydrolysable material thereby increasing the pH to precipitate species to the metals Cu, Zu, Al and R within the pores whereby the species are almost exclusively confined to the pores.
Dependencies are inferred from the claim text.