Preparation of catalysts of predetermined pore size distribution and pore volume
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-021/04
B01J-021/06
B01J-023/24
B01J-023/74
출원번호
US-0646490
(1976-01-05)
발명자
/ 주소
Sawyer Willard H. (Baton Rouge LA) Duncan Michael T. (Pontiac MI)
출원인 / 주소
Exxon Research and Engineering Company (Linden NJ 02)
인용정보
피인용 횟수 :
28인용 특허 :
0
초록▼
A process for the formation of a catalyst of predetermined pore size distribution and pore volume from an alumina hydrogel formed and obtained by precipitation from a solution containing a hydrous form of alumina in 1-5 wt. % concentration and an anion that is soluble in an alkaline solution and for
A process for the formation of a catalyst of predetermined pore size distribution and pore volume from an alumina hydrogel formed and obtained by precipitation from a solution containing 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 8-12, and temperature ranging about 15°F.-120°F., and then extended by contact with a water-soluble polymer containing from 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 and displace water from the pores until the weight ratio of polymer:alumina ranges about 0.5:1 to about 4:1. The so formed alumina hydrogel in a series of steps, inclusive of the polymer extending step, is blended with make-up and recycle polymer for displacement of water and incorporation of the polymer, spray dried to convert the hydrogel to essentially boehmite powder of microspherical form, the boehmite powder mulled with water to form a paste, and the paste extruded to form extrudates. If desired, the extrudates are marumerized to form spheres. The extrudates or spheres, as desired, are extracted with a solvent to remove the polymer, and the alumina is then dried and calcined to form gamma alumina. In formation of the catalyst, a metal hydrogenation component, or components, is added during the initial alumina hydrogel forming step, added to the hydrogel after its precipitation from solution, or added to the gamma alumina after calcination.
대표청구항▼
In a process for the formation of a catalyst comprised of a Group VI-B or Group VIII metal, or both, composited with alumina by precipitation of an alumina hydrogel from a solution which contains a hydrous form of alumina in concentration ranging from about 1 to about 5 percent, based on the weight
In a process for the formation of a catalyst comprised of a Group VI-B or Group VIII metal, or both, composited with alumina by precipitation of an alumina hydrogel from a solution which contains a hydrous form of alumina in concentration ranging from about 1 to about 5 percent, based on the weight of the solution, and a compound having an anion which forms an alkaline soluble aluminum salt in an alkaline medium, the alumina hydrogel being precipitated from solution at temperatures ranging from about 15°F. to about 120°F. and at pH ranging from about 8 to about 12, and then separated from the solution, the alumina hydrogel then being contacted 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, the improvement which comprises forming a slurry from the separated water-soluble polymer containing alumina hydrogel, spray drying said polymer containing alumina hydrogel by countercurrent contact of an atomiZed spray of the alumina hydrogel with air at temperature sufficient to form granules of boehmite, forming a paste from the granules of polymer containing boehmite and water, the past containing above about 20 percent by weight of solids, mulling said water-soluble polymer containing boehmite paste to provide a substantially homogeneous mass, extruding said polymer containing boehmite paste through a die to form spaghetti-like extrudate shapes, drying the spaghetti-like boehmite extrudate shapes to provide a solids content ranging from about 20 to about 30 percent, marumerizing the spaghetti-like boehmite extrudate shapes to form spheres of average particle size ranging from about 1/50 to about ⅛inch diameter, and calcining the marumerized spheres.
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