Thermally stable alumina particulates
Type: Patent
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patent at
Number: 6764672
Market: Aerospace,Alumina,Aluminum Ingot,Automotive,Building & construction,Commercial transportation,Industrial products,Packaging and consumer,Oil & Gas,Consumer electronics,Sustainability
Technology: Manufacturing systems & technology
Year: 2004
Abstract: Thermally stable transitional alumina particulates retaining high specific surface area after calcination at C. suitable for the use as catalysts or catalysts supports are produced by treating an aqueous solution containing Al.sup.3+ and optionally a doping amount of La.sup.3+ (e.g., 0.3 mol. %) with an anion-exchange resin to give a stable hydroxide sol followed by freeze drying of the sol and further thermal dehydration. The resultant stabilized transitional alumina retains high specific surface area at C., and additionally stabilization is achieved at very low levels of added La.
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