Preparation of catalysts of predetermined pore size distribution and pore volume
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-021/04
B01J-021/06
B01J-023/24
B01J-023/74
출원번호
US-0646492
(1976-01-05)
발명자
/ 주소
Robson Harry E. (Baton Rouge LA)
출원인 / 주소
Exxon Research and Engineering Company (Linden NJ 02)
인용정보
피인용 횟수 :
8인용 특허 :
0
초록▼
A process for the formation of a catalyst of predetermined pore size distribution and pore volume of precipitation and formation of an alumina hydrogel from a solution which contains a hydrous form of alumina, in 1-5 wt. % concentration, and an anion that is soluble in an alkaline solution and forms
A process for the formation of a catalyst of predetermined pore size distribution and pore volume of precipitation and formation of an alumina hydrogel from a solution which contains a hydrous form of alumina, in 1-5 wt. % concentration, and an anion that is soluble in an alkaline solution and forms an aluminum salt, at pH ranging about 8-12, and at temperature ranging about 15°F.-120°F. The alumina hydrogel is separated from the solution and washed in a pore volume extending step by contact with a solution of a water soluble polymer containing from about 2 to about 24 monomer units from the group consisting of (a) polyethylene glycols, (b) polypropylene glycols, and (c) polyethylene amines sufficient to absorb the polymer into the pores of the alumina hydrogel and displace water from the pores until the weight ratio of polymer:alumina within the hydrogel ranges from about 0.5:1 to about 4:1. Metal hydrogenation components, suitably a Group VI-B or Group VIII metal, or both, can be added during the hydrogel formation step (i.e. by cogellation), during the pore volume extending step, or after the alumina is formed, dried and calcined.
대표청구항▼
In a process for preparing a catalyst comprising a Group VI-B or Group VIII metal, or both, composited with alumina, the alumina being precipitated as an alumina hydrogel from a solution which contains a hydrous form of alumina and a compound having an anion soluble in an alkaline medium and which f
In a process for preparing a catalyst comprising a Group VI-B or Group VIII metal, or both, composited with alumina, the alumina being precipitated as an alumina hydrogel from a solution which contains a hydrous form of alumina and a compound having an anion soluble in an alkaline medium and which forms a soluble aluminum salt, the improvement comprising precipitating the hydrogel of alumina at temperatures ranging from about 15°F to about 120°F from the solution, which contains alumina in concentration ranging from about 1 to about 5 percent, based on the weight of solution, at pH ranging from about 8 to about 12, separating the alumina hydrogel from the solution, contacting the alumina hydrogel with a solution of a water-soluble polymer containing from about 2 to about 24 monomer units from the group consisting of (a) polyethylene glycols, (b) polypropylene glycols, and (c) polyethylene amines sufficient to absorb the polymer into the pores of the alumina hydrogel, displacing water from the pores until the weight ratio of polymer:alumina within the hydrogel ranges from about 0.5:1 to about 4:1, drying the hydrogel, and then calcining the dried hydrogel to form a gamma alumina catalyst composite characterized, when the catalyst is of size ranging from about 1/50 inch up to 1/25 inch average particle size diameter, at least about 15 percent of its total pore volume of absolute diameter within the range of about 150A to about 250A; when the catalyst is of size ranging from about 1/25 inch to about ⅛inch average particle size diameter, at least about 15 percent of its total pore volume of absolute diameter within the range of about 175A to about 275A; wherein, in each of these catalysts of differing ranges of particle size distributions, the pore volumes resultant from pores of 50A, and smaller, are minimized; the surface areas and pore volumes of the catalysts being interrelated with particle size, and pore size distributions, surface areas ranging at least about 200 m2/g to about 600 m2/g with pore volumes ranging from about 0.8 to about 3.0 cc/g (B.E.T.).
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