Process for preparing a catalyst suitable for the treatment of exhaust gases from internal combustion engines
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-023/00
B01J-023/40
B01J-023/58
B01J-023/70
출원번호
US-0291565
(1994-08-16)
우선권정보
FR-0005947 (1993-05-14)
발명자
/ 주소
Durand Daniel,FRX
Mabilon Gil,FRX
Guibard Isabelle,FRX
출원인 / 주소
Institut Francais du Petrole, FRX
대리인 / 주소
Millen, White, Zelano and Branigan, P.C.
인용정보
피인용 횟수 :
36인용 특허 :
6
초록▼
The invention involves the production of a catalyst that contains (1) at least one refractory inorganic oxide support, (2) at least one iron oxide, and (3) at least one cerium oxide, (4) at least one metal A, for example, from Groups VIB, VIIB, VIII, and IB of the Periodic System and, optionally (5)
The invention involves the production of a catalyst that contains (1) at least one refractory inorganic oxide support, (2) at least one iron oxide, and (3) at least one cerium oxide, (4) at least one metal A, for example, from Groups VIB, VIIB, VIII, and IB of the Periodic System and, optionally (5) at least one compound of metal B, for example, from Groups IA, IIA, the rare-earths group, and Group IVB of the Periodic System, deposited in the form of a porous layer ("washcoat") on a ceramic or metal substrate:
대표청구항▼
[ What is claimed is:] [1.] A process for producing a catalyst that contains at least one refractory inorganic oxide, which is .alpha.-alumina, .gamma.-alumina, .DELTA.-alumina, eta-alumina, theta-alumina, kappa-alumina, rho-alumina, chi-alumina, silica, a silica-alumina, a zeolite, a silica-magnesi
[ What is claimed is:] [1.] A process for producing a catalyst that contains at least one refractory inorganic oxide, which is .alpha.-alumina, .gamma.-alumina, .DELTA.-alumina, eta-alumina, theta-alumina, kappa-alumina, rho-alumina, chi-alumina, silica, a silica-alumina, a zeolite, a silica-magnesia, titanium oxide, zirconium oxide, or a mixture thereof; at least one iron oxide; at least one cerium oxide; at least one catalytically active metal A from Group VIB, VIIB, VIII or IB of the Periodic System; and optionally at least one compound of metal B from Group IA, IIA, IVB, or rare earths having atomic numbers 57-71 inclusive, all deposited in the form of a porous layer on a ceramic or metal substrate, said process comprising:(a), in an atomizing device having an inlet and an outlet, atomizing an aqueous suspension of at least one powder of said refractory inorganic oxide, at least one soluble cerium salt, at least one soluble iron salt, optionally at least one portion of at least one insoluble compound and/or at least one soluble salt of said metal B, and optionally at least one portion of at least one metal A that has been previously deposited by impregnation of at least one of a precursor thereof on at least one of the solid constituents that are present, so as to recover a powder, and optionally calcining the resultant powder;(b) transferring the resultant powder from step (a) back into suspension while optionally adding said compound of metal B, as well as, optionally at least one bonding agent and optionally at least one mineral acid or organic acid;(c) coating a ceramic or metal substrate with the suspension obtained in step (b);(d) calcining the coated substrate from step (c);(e) impregnating said coated and calcined substrate with any remainder or all of said precursor of metal A; and(f) heat-activating said coated, calcined, and impregnated substrate obtained from (e). [26.] In a process for producing a catalyst containing a ceramic or metal substrate having deposited thereon a porous layer of at least one refractory inorganic oxide, which is .alpha.-alumina, .gamma.-alumina, .DELTA.-alumina, eta-alumina, theta-alumina, kappa-alumina, rho-alumina, chi-alumina, silica, a silica-alumina, a zeolite, a silica-magnesia, titanium oxide, zirconium oxide, or a mixture thereof; at least one iron oxide; and at least one cerium oxide; at least one metal A and, optionally, at least one compound of metal B; said process comprising forming a powder and applying said powder to said substrate, the improvement in forming said powder which comprises atomizing an aqueous suspension of at least one powder of said refractory inorganic oxide, at least one soluble cerium salt, at least one soluble iron salt, optionally at least one portion of at least one insoluble compound and/or at least one soluble salt of said metal B, and optionally at least one portion of at least one metal A that was previously deposited by impregnation of at least one precursors thereof on at least one of the solid constituents that are present so as to recover a powder.
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이 특허에 인용된 특허 (6)
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