Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1974-07-10
1976-12-14
Peters, G. O.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
252462, 75173R, B01D 5300
Patent
active
039976513
ABSTRACT:
A new catalyst material of high activity, low cost, good chemical and physical stability and low activation temperature, consisting essentially of lanthanum distributed in elemental form in a carrier material, for example lanthanum alloyed with silver to form a solid solution. The catalyst material is preferably prepared by forming a melt of lanthanum and the carrier material, and then forming a solid alloy thereof by spin-casting techniques. The catalyst is effective where the catalytic action requires either the positive or the negative ionization of other materials, and especially where both positive and negative ionization are to be produced. The catalyst may be used as a substitute for platinum catalyst, generally with superior performance, and particularly so when used in the treatment of engine exhaust gases to decrease the output of carbon monoxide and nitrogen oxides. It is also useful as a catalyst at one or both of the electrodes in a fuel cell, as the catalyst in heterogeneous catalysis of materials to form chemical compounds therefrom or as a catalyst for catalytic cracking of petrochemicals. As a catalyst for the reduction of oxides of nitrogen it is especially effective, operates at very low temperatures compared with platinum, and is many times less expensive.
REFERENCES:
patent: 1871117 (1932-08-01), Day
patent: 3545917 (1970-12-01), Stephens
patent: 3565574 (1971-02-01), Kearby
patent: 3840471 (1974-10-01), Acres
patent: 3849342 (1974-11-01), Santala
"Chemical Abstracts;" vol. 62; 1965; p. 1116a.
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