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226 条记录 (耗时 0.031 秒)

    Process for producing microcrystalline barium ferrite platelets
    35.
    发明授权
    Process for producing microcrystalline barium ferrite platelets 失效
    生产微晶玻璃钢板的方法

    公开(公告)号：US5078984A

    公开(公告)日：1992-01-07

    申请号：US358614

    申请日：1989-05-30

    申请人： Susumu Iwasaki ,  Shigefumi Kamisaka ,  Yoshihiko Nakane ,  Iwao Yamazaki ,  Tutomu Hatanaka

    发明人： Susumu Iwasaki ,  Shigefumi Kamisaka ,  Yoshihiko Nakane ,  Iwao Yamazaki ,  Tutomu Hatanaka

    IPC分类号： C01G49/00 ,  G11B5/706 ,  H01F1/11

    CPC分类号： B82Y30/00 ,  C01G49/0036 ,  G11B5/70678 ,  C01P2004/22 ,  C01P2004/52 ,  C01P2004/64 ,  C01P2006/12

    摘要： A process for producing microcrystalline barium ferrite platelets which comprises: forming an aqueous alkaline dispersion containing coprecipitates of hydroxides of barium ions, iron (III) ions, and optionally ions of a substituent element; heating the dispersion to a temperature of not less than 50.degree. C. and not more than the boiling point of the dispersion under an atmospheric pressure to convert the coprecipitates to precursors of the barium ferrite; calcining the precursors to provide microcrystalline barium ferrite platelets; the improvement comprising the step of adding a carbonating agent such as sodium carbonate to the aqueous alkaline dispersion before or after the heating of the aqueous dispersion to insolubilize water soluble barium ions therein, and the step of calcining the barium ferrite precursors in the presnece of sodium sulfate at temperatures of 700.degree.-900.degree. C., to provide microcrystalline barium ferrite platelets of about 0.03-0.1 .mu.m in average particle size and 2-5 in planarity ratio.

    摘要翻译： 一种生产微晶钡铁氧体薄片的方法，包括：形成含有钡离子的氢氧化物，铁（III）离子和任选的取代基元素的离子的共沉淀物的水性碱性分散体; 将分散体在大气压下将分散体加热至不低于分散体的50℃以上的温度，将共沉淀物转化为钡铁氧体的前体; 煅烧前体以提供微晶钡铁素体血小板; 所述改进包括在水性分散体加热之前或之后向碳酸钠水溶液中加入碳酸酯如碳酸钠的步骤，以使其中的水溶性钡离子不溶化;以及在钠前体中煅烧钡铁氧体前体的步骤 硫酸盐，在700-900℃的温度下，得到平均粒度为约0.03-0.1μm，平均粒径为2-5μm的微晶钡铁氧体血小板。

    Methods for denitrization
    36.
    发明授权
    Methods for denitrization 失效
    脱硝方法

    公开(公告)号：US5049364A

    公开(公告)日：1991-09-17

    申请号：US518560

    申请日：1990-06-06

    申请人： Masafumi Yoshimoto ,  Tadao Nakatsuji ,  Kazuhiko Nagano

    发明人： Masafumi Yoshimoto ,  Tadao Nakatsuji ,  Kazuhiko Nagano

    IPC分类号： B01D53/86 ,  B01J23/38 ,  B01J23/56 ,  B01J23/58 ,  B01J23/66 ,  B01J23/68

    CPC分类号： B01J23/66 ,  B01D53/8628 ,  B01J23/38 ,  B01J23/56 ,  B01J23/58 ,  B01J23/68

    摘要： A denitrizing catalyst which comprises:(a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90% by weight as oxides;(b) at least one metal oxide selected from the group consisting of Co.sub.3 O.sub.4, Cu.sub.2 O, Cr.sub.2 O.sub.3, Mn.sub.2 O.sub.3, NiO, PbO, Bi.sub.2 O.sub.3, MoO.sub.2, Al.sub.2 O.sub.3, SiO.sub.2, ZrO.sub.2, Fe.sub.2 O.sub.3, TiO.sub.2, WO.sub.3, MoO.sub.3, SnO.sub.2 and ZnO in amounts of 5-50% by weight as oxides; and(c) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10% by weight as metals.Nitrogen oxides contained in waste gases are denitrized effectively by putting the gases into contact with the catalysts in the absence or presence of carbon monoxide as a reducing agent.

    Method of producing titanium oxides
    37.
    发明授权
    Method of producing titanium oxides 失效
    生产钛氧化物的方法

    公开(公告)号：US5011674A

    公开(公告)日：1991-04-30

    申请号：US438001

    申请日：1989-11-20

    申请人： Masafumi Yoshimoto ,  Tadao Nakatsuji ,  Kazuhiko Nagano

    发明人： Masafumi Yoshimoto ,  Tadao Nakatsuji ,  Kazuhiko Nagano

    IPC分类号： C01G23/053

    CPC分类号： C01G23/053 ,  C01G23/0536 ,  C01P2006/12

    摘要： There is provided a method of producing titanium-oxides which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in amounts of at least 0.5 times is moles as the titanium tetrachloride; adding an alkali to the resultant solution to produce titanium hydroxide; and drying and calcining the titanium hydroxide. A further method is provided which comprises: adding a solution of an alkali to an aqueous solution of titanium tetrachloride having a concentration of not more than 2.5 moles/l at temperatures of not less than 50.degree. C., thereby to substantially thermally hydrolyze the titanium tetrachloride and to produce titanium hydroxide; and drying and calcining the titanium hydroxide.

    摘要翻译： 提供一种生产钛氧化物的方法，其包括：四氯化钛水溶液与硫酸的混合量为摩尔数的至少0.5倍作为四氯化钛; 向所得溶液中加入碱以制备氢氧化钛; 并干燥并煅烧氢氧化钛。 提供了另外的方法，其包括：在不低于50℃的温度下，将碱溶液加入浓度不超过2.5摩尔/升的四氯化钛水溶液中，从而基本上使水解钛 四氯化钛并生成氢氧化钛; 并干燥并煅烧氢氧化钛。

    Molded catalyst and method of catalytic gas reactions using the same
    39.
    发明授权
    Molded catalyst and method of catalytic gas reactions using the same 失效
    成型催化剂及使用其的催化气体反应方法

    公开(公告)号：US4892716A

    公开(公告)日：1990-01-09

    申请号：US183155

    申请日：1988-04-19

    申请人： Kazunobu Abe ,  Toshikatsu Umaba

    发明人： Kazunobu Abe ,  Toshikatsu Umaba

    IPC分类号： B01J35/04 ,  B01D53/86 ,  B01D53/94 ,  B01J33/00 ,  B01J35/00 ,  C04B38/00

    CPC分类号： B01D53/8628 ,  B01J35/00 ,  C04B38/0006 ,  Y10S423/13 ,  Y10S423/15

    摘要： A molded catalyst for fitting into a reactor vessel having an inlet and an outlet for a reactant gas, the catalyst having openings therethrough parallel to the direction of a reactant gas which is introduced into the reactor vessel from the inlet, the catalyst comprising: a wear-resistant front surface facing the inlet of the reactor vessel and a continuation of the front surface extending therefrom, the both being the front portion of the catalyst, and the remaining part of the catalyst made so wear-susceptible as to have either:(a) a wearability of 2-10% in a shaking abrasion test wherein grinding particles having an average particle size of 100 .mu.m and a Mohs scale of 9 are placed in the openings of the catalyst in an amount of 50% by volume based on the total volume of the openings, and the catalyst is shaked for three hours with an amplitude of 77 mm and a frequency of 320 per minute; or(b) a wearability of 7.5-35% in an air abrasion test wherein an air which contains silica particles having an average particle size of 40 .mu.m in amounts of 70 g/m.sup.3 is passed through in a reactor vessel including a rectangular parallelepipedic catalyst of 45 mm wide, 45 mm thich and 100 mm long so fitted thereinto that the catalyst extends longitudinally in the direction of the flow of the air for 30 min. at a superficial velocity of 40 m/sec. at the front face of the catalyst.

    Catalyst and a method for denitrizing nitrogen oxides contained in waste gases
    40.
    发明授权
    Catalyst and a method for denitrizing nitrogen oxides contained in waste gases 失效
    催化剂和废气中所含的氮氧化物脱氮的方法

    公开(公告)号：US4859439A

    公开(公告)日：1989-08-22

    申请号：US102639

    申请日：1987-09-30

    申请人： Hiroaki Rikimaru ,  Tadao Nakatsuji ,  Toshikatsu Umaba ,  Kuzuhiko Nagano ,  Kazuya Mishina ,  Hiromitsu Shimizu

    发明人： Hiroaki Rikimaru ,  Tadao Nakatsuji ,  Toshikatsu Umaba ,  Kuzuhiko Nagano ,  Kazuya Mishina ,  Hiromitsu Shimizu

    IPC分类号： B01D53/86 ,  B01J21/06 ,  B01J23/00 ,  B01J23/22 ,  B01J23/28 ,  B01J23/30 ,  B01J35/10

    CPC分类号： B01J21/063 ,  B01D53/8628 ,  B01J23/22 ,  B01J35/1038 ,  B01J35/1061 ,  B01J35/1066 ,  B01J35/1071 ,  B01J35/108

    摘要： A catalyst for denitrizing nitrogen oxides contained in waste gases, which comprises:(a) titanium, and(b) at least one base metal selected from the group consisting of V, W, Mo, Mn, Cu, Fe, Cr, Co, Ni, Zn and Sn, the catalyst containing titanium and the base metals in amounts of at least about 50% by weight in terms of oxides based on the catalyst, and titanium in amounts of about 80-99% by weight in terms of oxides and the base metals in amounts of about 20-1% by weight in terms of oxides, respectively, based on the total weight in terms of oxides of titanium and the base metals, and the catalyst having micropores of about 50-75000 .ANG. in radius in amounts of about 0.25-0.45 ml/g, and micropores of about 50-100 .ANG. in radius in amounts of about 10-40% by volume and micropores of about 500-60000 .ANG. in radius in amounts of not less than about 10% by volume, respectively, based on the total volume of the micropores of about 50-75000 .ANG. in radius, in the presence of a reducing gas at elevated temperatures.The catalyst retains a higher denitrizing activity over a long period time than the conventional catalysts, and is substantially free from deactivation with arsenic or arsenic compounds contained in waste gases.

    摘要翻译： 1.一种用于脱氮废气中含有的氮氧化物的催化剂，其包括：（a）钛，和（b）选自V，W，Mo，Mn，Cu，Fe，Cr，Co， Ni，Zn和Sn中的至少约50重量％的钛和贱金属的催化剂，以氧化物为基准，以催化剂为基准，钛的量为约80-99重量％，以氧化物计， 基于以氧化物为基准的总重量计，以氧化物计为约20-1重量％的贱金属，以钛和贱金属的氧化物计的总重量，以及具有约50-75000安培的微孔的催化剂半径 约0.25-0.45ml / g的量的微孔和约50-100的微孔，其量为约10-40体积％，微孔为约500-60000，半径为不小于约10％ 体积，分别基于微孔的总体积约50-75000安培半径，在存在o f在升高的温度下还原气体。 与常规催化剂相比，催化剂在长时间内保持较高的脱氨活性，并且与废气中所含的砷或砷化合物基本上没有失活。