Composite oxide powder, catalyst and process for producing the same
    1.
    发明授权
    Composite oxide powder, catalyst and process for producing the same 失效
    复合氧化物粉末,催化剂及其制造方法

    公开(公告)号:US06762147B2

    公开(公告)日:2004-07-13

    申请号:US10079872

    申请日:2002-02-22

    IPC分类号: B01J2108

    摘要: Composite oxide powder has a large specific surface area and a large pore volume even after a high-temperature durability test, without losing oxygen storage ability of a single metal oxide. In this composite oxide powder, a first metal oxide having oxygen storage ability is held as ultrafine particles in the form of islands by a second metal oxide which is different from the first metal oxide, pore volume is not less than 2 cc/g and the first metal oxide particles have a diameter of not more than 30 nm even after subjected to high temperature of 900° C. or more. Since the first metal oxide particles are held in the form of islands by the second metal oxide particles, separated from each other and suppressed from contacting each other, the first metal oxide particles hardly grow granularly.

    摘要翻译: 复合氧化物粉末即使在高温耐久性试验后也具有大的比表面积和较大的孔体积,而不损失单一金属氧化物的储氧能力。 在该复合氧化物粉末中,具有储氧能力的第一金属氧化物通过与第一金属氧化物不同的第二金属氧化物保持为岛状的超微粒子,孔体积不小于2cc / g, 即使在900℃以上的高温下,第一金属氧化物粒子的直径也不大于30nm。 由于第一金属氧化物颗粒通过第二金属氧化物颗粒被保持为岛状,因此彼此分离并被抑制彼此接触,因此第一金属氧化物颗粒几乎不会颗粒生长。

    Titania-zirconia powder and process for producing the same
    4.
    发明授权
    Titania-zirconia powder and process for producing the same 有权
    二氧化钛 - 氧化锆粉末及其制造方法

    公开(公告)号:US06391276B1

    公开(公告)日:2002-05-21

    申请号:US09525232

    申请日:2000-03-14

    IPC分类号: C01G2300

    摘要: Disclosed are (1) a titania-zirconia powder having at least a part of the zirconia solid-dissolved in the titania crystalline phase or at least a part of the titania solid-dissolved in the zirconia crystalline phase, (2) a titania-zirconia powder containing 3 to 30 wt % of zirconia and 0.5 to 10 wt % of yttria and containing less than 20 wt %, in total, of at least a complex oxide having a composition of ZrTiO4 or (Ti,Zr) O2, monoclinic phase zirconia, and tetragonal phase zirconia, wherein the titania-zirconia powder comprises an anatase phase, and which retains a specific surface area of 34 m2/g or more after heat-treated at 900° C. for 5 hours in the air, and (3) a titania-zirconia powder wherein the titania-zirconia powder (1) or (2) having an average particle size of 1 &mgr;m or smaller is mutually dispersed with an alumina powder; and processes for producing the powders are disclosed.

    摘要翻译: 公开了(1)二氧化钛 - 氧化锆粉末,其中至少一部分氧化锆固体溶解在二氧化钛结晶相中,或至少一部分固体溶解在氧化锆晶相中,(2)二氧化钛 - 氧化锆 含有3〜30重量%的氧化锆和0.5〜10重量%的氧化钇和至少含有20重量%的至少具有ZrTiO 4或(Ti,Zr)O 2组成的复合氧化物,单斜相氧化锆 和四方相氧化锆,其中二氧化钛 - 氧化锆粉末包含锐钛矿相,并且在900℃下在空气中热处理5小时后,比表面积保持为34m 2 / g以上,(3 )二氧化钛 - 氧化锆粉末,其中平均粒度为1μm或更小的二氧化钛 - 氧化锆粉末(1)或(2)与氧化铝粉末相互分散; 公开了制造粉末的方法。