摘要:
The present invention is directed to a method of forming titania clad high surface area alumina suitable as a support for forming noble metal catalysts. The resultant catalysts exhibit resistance to poisoning by sulfurous materials and, therefore, are useful in applications directed to internal combustion engine emission conversion and the like. The present invention provides a commercially feasible and cost effective method of forming a highly desired support for noble metal catalyst application. The process comprises forming a slurry of porous alumina particulate suitable as a catalyst support for the intended application, mixing said slurry with a solution of titanyl sulfate having a pH of about 1, increasing the pH of the mixed slurry/solution at a slow rate of from 0.05 to 0.5 pH unit per minute to a pH of ≦̸4 by the addition of a basic solution, allowing the resultant slurry to age for a period of from 10 to 120 minutes, separating the treated porous alumina particulates and washing same free of sulfate with a weak base, drying and calcining said particulates to produce titania clad alumina particulate product. The resultant material exhibits a normalized sulfur uptake of less than about 45 μg/m2-sample. Such material can subsequently be coated with a noble metal to form the catalyst material.
摘要:
PROBLEM TO BE SOLVED: To provide a sulfur occlusion catalyst which keeps its excellent sulfur occlusion performance even when the temperature of exhaust gas is low while holding down a sharp increase in the material cost thereof. SOLUTION: The sulfur occlusion catalyst 2 is provided with: a catalyst carrier; a catalytic metal which is carried by the catalyst carrier and oxidizes SO 2 into SO 3 ; and a sulfur occlusion material which is also carried by the catalyst carrier and absorbs a sulfur component. The sulfur occlusion catalyst 2 has an exhaust gas inlet-side high-concentration part 2A where the sulfur occlusion material of high concentration is carried by the catalyst carrier and an exhaust gas outlet-side low concentration part 2B where the sulfur occlusion material of the concentration lower than that of the exhaust gas inlet-side high-concentration part 2A is deposited on the catalyst carrier. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To increase SO x occlusion amount of an occlusion catalyst disposed at an upstream side of NO x occlusion reduction catalyst, and to increase NO x occlusion amount in a low temperature region. SOLUTION: The occlusion catalyst 3 comprises: a carrier base material 30 which is formed of at least one member selected from among Al 2 O 3 , CeO 2 , ZrO 2 , TiO 2 and zeolite and has a specific area of 30 m 2 /g or more; and a coat layer 31 formed by carrying occlusion material occluding NO x and SO x and a noble metal on carrier powder comprising at least one member selected from among Al 2 O 3 , CeO 2 , ZrO 2 , TiO 2 and zeolite. The large specific area of the carrier base material 30 greatly increases the carrying amount of occlusion material occluding NO x and SO x . COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译:待解决的问题:为了提高设置在NOS SB阻塞还原催化剂上游侧的阻塞催化剂的SO x SB>阻塞量,并增加NO SB > x SB>阻塞量。 解决方案:阻挡催化剂3包括:载体基材30,其由至少一种选自Al 2 O 3,SBO 3,SBO 3, 2 SB>,ZrO 2 SBB,TiO 2 SBB和沸石,比表面积为30m 2 / SP / g以上; 以及涂覆层31,其通过将包含NO SB SB和X SB SB的X射线吸附材料和载体粉末上的贵金属构成,所述载体粉末包含至少一种选自Al SB 3,SBO 3,SBO 2,SBO 2,SBO 2,SBO 2和SBB。 载体基材30的较大的比表面积大大地增加了阻塞材料的吸留量(NO x SB>和SO x SB>)。 版权所有(C)2008,JPO&INPIT