Catalyst – solid sorbent – or support therefor: product or process – Perovskite
Patent
1997-02-07
1999-11-02
Caldarola, Glenn
Catalyst, solid sorbent, or support therefor: product or process
Perovskite
502302, 502303, 502304, 502306, 502324, 502326, 502328, B01J 2300, B01J 2332, B01J 2340, B01J 2358
Patent
active
059770171
ABSTRACT:
A perovskite-type catalyst consists essentially of a metal oxide composition. The metal oxide composition is represented by the general formula A.sub.1-x B.sub.x MO.sub.3, in which A is a mixture of elements originally in the form of single phase mixed lanthanides collected from bastnasite; B is a divalent or monovalent cation; M is at least one element selected from the group consisting of elements of an atomic number of from 23 to 30, 40 to 51, and 73 to 80; a is 1 or 2; b is 3 when a is 1 or b is 4 when a is 2; and x is a number defined by 0.ltoreq.x<0.5.
REFERENCES:
patent: 3865752 (1975-02-01), Remeika et al.
patent: 3865923 (1975-02-01), Stephens
patent: 3884837 (1975-05-01), Remeika et al.
patent: 3897367 (1975-07-01), Lauder
patent: 3929670 (1975-12-01), Kudo et al.
patent: 4001371 (1977-01-01), Remeika et al.
patent: 4049583 (1977-09-01), Lauder
patent: 4107163 (1978-08-01), Donohue
patent: 4126580 (1978-11-01), Lauder
patent: 4151123 (1979-04-01), McCann, III
patent: 4748143 (1988-05-01), Tabata
patent: 5318937 (1994-06-01), Jovanovic et al.
patent: 5380692 (1995-01-01), Nakatsuji et al.
Marcilly et al, Preparation of Highly Dispersed Mixed Oxides and Oxide Solid Solutions by Pyrolysis of Amorphous Organic Precursors, J. Am. Ceram. Soc., 53 (1970) 56-57.
Libby, Promising Catalyst for Auto Exhaust, Science, 171 (1971) 499-500.
Voorhoeve et al, Rare-Earth Oxides of Manganese and Cobalt Rival Platinum for the Treatment of Carbon Monoxide in Auto Exhaust, Science, 177 (1972) 353-354.
Voorhoeve et al, Rare-Earth Manganites: Catalysts with Low Ammonia Yield in the Reduction of Nitrogen Oxides, Science, 180 (1973), 62-64.
Voorhoeve et al, Perovskite Oxides: Materials Science in Catalysis, Science, 195 (1977) 827-833.
Voorhoeve et al, Exploration of Perovskite-Like Catalysts, Mat. Res. Bull., 9 (1974) 655-666.
Johnson et al, Preparation of High Surface Area Substituted LaMnO3 Catalysts, Ceramic Bulletin, 55 (1976) 520-527.
Baythoun et al, Production of strontium-substituted lanthanum manganite perovskite powder by the amorphous citrate process, J. Mat. Sci., 17 (1982) 2757-2769.
Asamitsu, A structural phase transition induced by an external magnetic field, Nature 373 (1995) 407-409.
Chakraborty et al, Low-temperature synthesis of ultrafine la0.84MnO3 powder by an autoignition process, J. Mat. Res. 9 (1994) 986-991.
Kilbourn, B.T., Lanthanides and Yttrium (Raw Materials for Advanced and Engineered Ceramics), Cer. Eng. Sc. Proc. By, 6 (1985) pp. 1331-1341.
Habashi, F., The Discovery and Industrialization of the Rare Earths, UNOCAL.sup.76 Molycorp, (1994), reprinted from CIM Bulletin Jan. and Feb., 1994.
Sakaguchi et al, Electrocatalytic Activity and Oxygen Adsorption Property of Perovskite-type Oxides, Electrochimica Acta 35 (1990) 65-67.
Meadowcroft, D.B., Low-cost Oxygen Electrode Material, Nature 226 (1970) 847-848.
Johnson et al, Studies of some Perovskite Oxidation Catalysts Using DTA Techniques, Thermochimica Acta, 7 (1973) 303-309.
Tseung et al, Preparation and Characterisation of High Surface Area Semiconducting Oxides, J. Mater. Sci 5 (1970) 604-610.
Ni, Yunxiang et al, The atomic arrangement of bastnasite-(Ce), Ce(CO3)F, and structural elements of synchysite-(Ce), rontgenite-(Ce), and parisite-(Ce), Am. Mineral. 78 (1993) 415-418.
M. Fleischer, Relative Proportions of the Lanthanides in Minerals of the Bastnaesite Group, Can. Mineral, 16 (1978) 361-363.
Ohbayashi et al., Crystallographic, Electric and Thermochemical Properties of the Perovskite-Type Ln.sub.1-x Sr.sub.x CoO.sub.3 (Ln: Lanthanoid Element), Japanese Journal of Applied Physics, vol. 13, No.. 1, Jan. 1974, 1-7.
Taylor, Automobile Catalytic Converters, Springer-Verlag, 1984, pp. 4, 5, 11.
Heck and Farrauto, Automotive Catalysts, Automotive Engineering, Feb. 1996, 93-96.
Narual et al., Materials Chemistry Issues Related to Advanced Materials Applications in the Automotive Industry, Chem. Mater, vol. 8, No. 5, 1996, 984-1003.
Voorhoeve et al., Defect Chemistry and Catalysis in Oxidation and Reduction Over Perovskite-Type Oxides, Annals New York Academy of Science,1976, pp. 3-21.
Viswanathan, CO Oxidation and NO Reduction on Perovskite Oxides, Catal. Rev.-Sci. Eng., 34(4), 337-354 (1992).
Burton & Garten, Advanced Materials in Catalysis, Academic Press, New York, 1997.
Nakamura et al., Reduction-Oxidation and Catalytic Properties of La.sub.1-x Sr.sub.x CoO.sub.3' Journal of Catalysis, 83, 151-159 (1983).
Nitadori & Misono, Catalytic Properties of La.sub.1-x, A'.sub.x FeO.sub.3 (A' = Sr.sub.1 Ce) and La.sub.1-x Ce.sub.x CoO.sub.3, Journal of Catalysis, 93, 459-466 (1985).
Nitadori et al., Catalytic Properties of La.sub.1-x, A'xMnO.sub.3 (A' = Sr.sub.1 Ce, Hf), Journal of Catalysis, 98, 221-228 (1986).
Kirk-Othmer, Encyclopedia of Chemical Technology, 3ed., vol. 19, 833-838 (1982).
Bullock In Suk
Caldarola Glenn
Catalytic Solutions, Inc.
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