[특허]Thermally stable nickel-alumina catalysts useful for methanation and other reactions

[미국특허] Thermally stable nickel-alumina catalysts useful for methanation and other reactions 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01J-021/04 B01J-023/74
출원번호	US-0907804 (1978-05-19)
발명자 / 주소	McArthur Dennis P. (Yorba Linda CA)
출원인 / 주소	Union Oil Company of California (Brea CA 02)
인용정보	피인용 횟수 : 30 인용 특허 : 0

초록 ▼

Nickel-alumina catalysts having a remarkably high degree of thermal stability, and active for the hydrogenation of carbon oxides (methanation), steam reforming, gasification, etc. are prepared by a novel “precipitative-occlusion”method. This method involves digesting a slurry of an alumina hydrate in an aqueous solution of an ammino complex of a nickel salt. The digestion is carried out at a temperature sufficiently high to decompose the ammino complex and “release”the nickel (II) ions. This results in a gradual precipitation of nickel hydroxide in the pores and interstices formed by the agglomerating particles of alumina hydrate. The coflocculated solids are recovered as by filtration, washed, dried and calcined. The resulting compositions are found, in high temperature reactions such as methanation, to retain their activity for much longer periods of time than do conventional nickel-alumina catalysts prepared by the most widely used prior art technique, viz, coprecipitation.

대표청구항 ▼

A thermally stable catalyst composition comprising a substantially homogeneous composite of between about 30 and 95 weight-percent of an alumina component and about 5 and 70 weight-percent of a nickel component calculated as NiO, said nickel component comprising radiation-detectable crystallites of nickel oxide and nickel aluminate, said catalyst having been prepared by the steps of: (1) slurrying a powdered alumina hydrate in an aqueous solution of a nickel salt for a sufficient time to effect pore saturation of said alumina hydrate with said solution, wherein a sufficient amount of said nickel salt being in the form of an ammino complex with ammonia to provide at least 2 moles of ammino ligands per mole of said nickel salt; (2) heating the resulting slurry with agitation at a temperature and for a time sufficient to bring about a gradual decomposition of substantially all of said ammino complex with resultant liberation of ammonia and precipitation of substantially all of said nickel salt to form the hydrated precursor of said nickel component intimately composited with said alumina hydrate; and (3) drying and calcining the resulting composite at a temperature sufficiently high to convert said alumina hydrate to gamma alumina.

이 특허를 인용한 특허 (30) 인용/피인용 타임라인 분석

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Hu,X. D.; Loi,Patrick J.; O'Brien,Robert J., High surface area, small crystallite size catalyst for Fischer-Tropsch synthesis.
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Lee, Hyun-chul; Kim, Soon-ho; Lee, Kang-hee; Lee, Doo-hwan; Park, Eun-duck; Ko, Eun-yong, Methanation catalyst, and carbon monoxide removing system, fuel processor, and fuel cell including the same.
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Sambrook Rodney M. (Sheffield GB2) Ross Julian R. H. (Cleckheaton GB2), Method of preparing a catalyst and catalyst prepared by the method.
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Lok Cornelis M. (Rockanje NLX) Verzijl Dirk (Barendrecht NLX) van Dijk Jacob (Maassluis NLX), Nickel catalyst on alumina support.
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A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Thermally stable nickel-alumina catalysts useful for methanation and other reactions 원문보기