Catalyst for removing NO.sub.x from gas streams
    1.
    发明授权
    Catalyst for removing NO.sub.x from gas streams 失效
    用于从气流中除去NOx的催化剂

    公开(公告)号:US4314913A

    公开(公告)日:1982-02-09

    申请号:US127106

    申请日:1980-03-04

    摘要: Nitrogen oxides, NO.sub.x, are depleted/removed from oxygen-containing gas streams comprising same, by contacting an admixture of ammonia and such gas streams, at elevated temperatures, with a catalyst which comprises a catalytically active metallic oxide deposited on a porous alumina support, said support comprising a volume of pores having diameters larger than 1000 A in excess of 25 cm.sup.3 /100 g, a volume of pores having diameters larger than 300 A in excess of 40 cm.sup.3 /100 g, a total pore volume of from about 80 cm.sup.3 /100 g to 120 cm.sup.3 /100 g, and a surface area of less than 160 m.sup.2 /g, said catalytically active metallic oxide being an oxide of a metal selected from the group consisting of vanadium, iron and cobalt, and said catalytically active metal oxide comprising from 0.5 to 20% by weight of the catalyst.

    摘要翻译: 通过在高温下将氨和这种气流的混合物与包含沉积在多孔氧化铝载体上的催化活性金属氧化物的催化剂接触,使含氧气体NO x从含氧气流中消耗/除去, 所述载体包含一定体积的孔径,其直径大于1000A,超过25cm 3 / 100g,直径大于300A的孔体积超过40cm 3 / 100g,总孔体积为约80cm 3 / 100g至120cm 3 / 100g,表面积小于160m 2 / g,所述催化活性金属氧化物是选自钒,铁和钴的金属的氧化物,所述催化活性金属 氧化物,其包含0.5至20重量%的催化剂。

    Preparation of molybdenum/tungsten mixed oxide catalysts
    2.
    发明授权
    Preparation of molybdenum/tungsten mixed oxide catalysts 失效
    钼/钨复合氧化物催化剂的制备

    公开(公告)号:US4382880A

    公开(公告)日:1983-05-10

    申请号:US256046

    申请日:1981-04-21

    申请人: Jean-Yves Derrien

    发明人: Jean-Yves Derrien

    摘要: An active oxidation catalyst having the formula:A.sub.a Mo.sub.c W.sub.d B.sub.b O.sub.xwherein A is at least one of the metals cobalt, nickel, manganese and/or lead; B is at least one of the metals iron, bismuth, chromium and/or thallium; a is the sum of each of the metals A and ranges from greater than zero to about 12; c and d each ranges from zero to 12, with their sum being about 12; b is the sum of each of the metals B and ranges from greater than zero to about 1.5[(c+d)-a]; an x fulfills all unsatisfied valences, is prepared by (I) intimately admixing (i) a first aqueous solution comprising the ammonium salts of the molybdenum and/or tungsten, said ammonium salts being present therein in amounts such as to satisfy the formula parameters c and d, with (ii) a second aqueous solution comprising the salts of the A and/or B metals, at least one of said A and/or B salts being either a nitrate or a chloride and said salts being present therein in amounts such as to satisfy the formula parameters a and b, until a first solids fraction precipitates therefrom; (II) thereafter basicifying the resulting suspension with ammonia to a pH value in excess of the pH of said first aqueous solution, until a second solids fraction precipitates therefrom; (III) recovering said first and said second solids fractions, and drying the same; and (IV) thence calcining said dried solids fractions.

    摘要翻译: 具有下式的活性氧化催化剂:AaMocWdBbOx其中A是金属钴,镍,锰和/或铅中的至少一种; B是至少一种金属铁,铋,铬和/或铊; a是每种金属A的总和,其范围从大于零至约12; c和d各自为零至12,其总和为12; b是每个金属B的总和,其范围从大于零至约1.5 [(c + d)-a]; 通过(I)密切混合(i)包含钼和/或钨的铵盐的第一水溶液,所述铵盐存在于其中以满足式参数c的量来制备,x满足所有不满足的价态 和d,与(ii)包含A和/或B金属的盐的第二水溶液,所述A和/或B盐中的至少一种是硝酸盐或氯化物,并且所述盐存在于其中 以满足公式参数a和b,直到第一固体馏分从其沉淀出来; (II),然后用氨将所得悬浮液碱化至超过所述第一水溶液的pH的pH值,直到第二固体分数从其沉淀; (III)回收所述第一和所述第二固体部分,并将其干燥; 和(IV)然后煅烧所述干燥的固体部分。

    Preparation of mixed oxide catalysts comprising the oxides of molybdenum
and/or tungsten
    3.
    发明授权
    Preparation of mixed oxide catalysts comprising the oxides of molybdenum and/or tungsten 失效
    制备包含钼和/或钨的氧化物的混合氧化物催化剂

    公开(公告)号:US4418007A

    公开(公告)日:1983-11-29

    申请号:US310399

    申请日:1981-10-09

    申请人: Jean-Yves Derrien

    发明人: Jean-Yves Derrien

    摘要: Mixed oxide active catalysts having the formula:A.sub.a Mo.sub.c W.sub.d B.sub.b O.sub.xwherein:A is at least one of the metals cobalt, nickel, manganese and/or lead;B is at least one of the metals iron, bismuth, chromium and/or thallium;a is the sum of the values indicating the amounts present of each of the metals A, and is a number ranging from greater than 0 to about 12;c and d are numbers each equal to or greater than 0 and ranging to 12, with the sum c+d being about 12;b is the sum of the values indicating the amounts present of each of the metals B, and is a number ranging from greater than 0 to about 1.5 [(c+d)-a]; andx is a number satisfying all unbalanced valences, are prepared by, in a first stage, intimately admixing in aqueous phase the salts of all metals to comprise such active catalyst, with the salts of molybdenum and/or tungsten being ammonium salts and at least one salt of at least one of the metals A and B being a nitrate or a chloride whereby ammonia is added to an aqueous solution comprising the ammonium salts of molybdenum and/or tungsten in an amount sufficient to adjust the pH thereof to a value ranging from about 6 to 8 and then adding to the resulting solution simultaneously, a second aqueous solution comprising the A and B metal salts and sufficient ammonia to maintain the pH in the range of from about 6 to 8. The resulting suspension is then filtered with the recovered paste being dried and calcined.

    摘要翻译: 具有下式的混合氧化物活性催化剂:AaMocWdBbOx其中:A是金属钴,镍,锰和/或铅中的至少一种; B是至少一种金属铁,铋,铬和/或铊; a是表示金属A各自存在的量的值的和,为大于0〜约12的数; c和d分别为等于或大于0且范围为12的数字,并且c + d为约12; b是表示金属B各自存在的量的值之和,为大于0〜约1.5 [(c + d)-a]的数。 并且x是满足所有不平衡价数的数字,通过在第一阶段中将所有金属的盐包含在这种活性催化剂中,在第一阶段中将钼和/或钨的盐作为铵盐和至少 金属A和B中的至少一种的一种盐是硝酸盐或氯化物,其中将氨加入到包含钼和/或钨的铵盐的水溶液中,其量足以将其pH值调节至 约6至8℃,然后同时向所得溶液中加入包含A和B金属盐的第二水溶液和足够的氨,以将pH保持在约6至8范围内。然后将所得悬浮液用回收的 将浆料干燥并煅烧。

    Preparation of mixed oxide catalysts comprising the oxides of molybdenum
and/or tungsten
    4.
    发明授权
    Preparation of mixed oxide catalysts comprising the oxides of molybdenum and/or tungsten 失效
    制备包含钼和/或钨的氧化物的混合氧化物催化剂

    公开(公告)号:US4388226A

    公开(公告)日:1983-06-14

    申请号:US316896

    申请日:1981-10-30

    摘要: Mixed oxide active catalysts having the formula:A.sub.a Mo.sub.c W.sub.d Co.sub.e B.sub.b O.sub.xwherein:A is at least one of the metals nickel, manganese and/or lead;B is at least one of the metals iron, bismuth, chromium and/or thallium;a is the sum of the values indicating the amounts present of each of the metals A, and is a number ranging from greater than or equal to 0 to about 4;c and d are numbers each equal to or greater than 0 and ranging to 12, with the sum c+d being about 12;e is a number ranging from about 8 to about 12;b is the sum of the values indicating the amounts present of each of the metals B, and is a number ranging from greater than 0 to about 1.5 [(c+d)-(a+e)]; andx is a number satisfying all unbalanced valences,are prepared by, in a first stage, intimately admixing in aqueous phase the salts of all metals to comprise such active catalyst, with the salts of molybdenum and/or tungsten being ammonium salts and at least one salt of at least one of the metals A and B being a nitrate; and, in a second stage, drying and calcining. In the process, the problems of ammonium nitrate formation are avoided by, in the first stage, acidifying an aqueous solution comprising the ammonium salts of molybdenum and/or tungsten to a pH ranging from about 0.5 to 3, separating the molybdic and/or tungstic acid precipitates which thereby form and preparing an aqueous suspension thereof, and then admixing therewith aqueous solutions of the metal salts of the remaining metals comprising the catalyst.

    摘要翻译: 具有下式的复合氧化物活性催化剂:AaMocWdCoeBbOx其中:A是金属镍,锰和/或铅中的至少一种; B是至少一种金属铁,铋,铬和/或铊; a是表示金属A各自存在的量的值的和,为大于等于0〜4的数; c和d分别为等于或大于0且范围为12的数字,并且c + d为约12; e为约8至约12的数; b是表示每种金属B存在的量的值的和,大于0至约1.5 [(c + d) - (a + e)]; 并且x是满足所有不平衡价数的数字,通过在第一阶段中将所有金属的盐包含在这种活性催化剂中,在第一阶段中将钼和/或钨的盐作为铵盐和至少 金属A和B中的至少一种的一种盐是硝酸盐; 并在第二阶段中进行干燥和煅烧。 在此过程中,通过在第一阶段将包含钼和/或钨的铵盐的水溶液酸化至约0.5至3的pH,可以避免形成硝酸铵的问题,将钼和/或钨 从而形成并制备其水性悬浮液,然后与包含催化剂的剩余金属的金属盐的水溶液混合。