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    COMBUSTION EXHAUST GAS PURIFYING CATALYST AND METHOD FOR PURIFYING COMBUSTION EXHAUST GAS
    5.
    发明公开
    COMBUSTION EXHAUST GAS PURIFYING CATALYST AND METHOD FOR PURIFYING COMBUSTION EXHAUST GAS 审中-公开
    VERBRENNUNGSABGASREINIGUNGSKATALYSATOR UND VERFAHREN ZUR REINIGUNG VON VERBRENNUNGSABGAS

    公开(公告)号：EP3124113A1

    公开(公告)日：2017-02-01

    申请号：EP15769841.6

    申请日：2015-03-23

    Applicant: Hitachi Zosen Corporation

    Inventor： YOSHIDA, Satoshi ,  HIKAZUDANI, Susumu ,  SHIMIZU, Kana ,  SHONO, Emi

    IPC: B01J29/46 ,  B01D53/86 ,  B01J29/68 ,  B01J37/08 ,  F01N3/08 ,  F01N3/10 ,  F01N3/28

    CPC classification number: B01J29/68 ,  B01D53/9418 ,  B01D2251/208 ,  B01D2255/20746 ,  B01D2255/50 ,  B01D2255/504 ,  B01J23/75 ,  B01J29/072 ,  B01J29/46 ,  B01J35/0006 ,  B01J35/002 ,  B01J37/0246 ,  B01J2229/186 ,  B01J2229/40 ,  F01N3/20 ,  F01N2370/04 ,  F01N2570/14 ,  Y02T10/24

    Abstract: To provide a catalyst for purifying a combustion exhaust gas and a method for purifying a combustion exhaust gas, in which in the removal of a nitrogen oxide from an exhaust gas in a relatively low temperature range discharged, for example, from an internal combustion engine, such as a marine diesel engine, the selectivity of an alcohol reducing agent to the denitration reaction is increased as compared to the ordinary technique, and thereby the denitration capability is enhanced with an amount of the reducing agent that is equivalent to the ordinary technique, thereby enabling the exhaust gas processing performed with a high efficiency. The denitration catalyst used in a method for purifying a combustion exhaust gas of removing a nitrogen oxide in the exhaust gas by making the catalyst into contact with the combustion exhaust gas having an alcohol as a reducing agent added thereto, contains zeolite as a support having supported thereon a catalyst metal, in a powder X-ray diffraction (XRD) measurement of the denitration catalyst a ratio (relative peak intensity ratio) r = I/J of a height I of a diffraction peak at a diffraction angle (2θ) of from 7.8 to 10.0º and a height J of a diffraction peak at a diffraction angle (2θ) of from 28.0 to 31.0º being in a range of from 3.0 to 5.0.

    Abstract translation: 为了提供一种用于净化燃烧废气的催化剂和一种用于净化燃烧废气的方法，其中在从例如内燃机排出的较低温度范围内从排气中除去氮氧化物时， 例如船用柴油发动机，与常规技术相比，醇还原剂对脱硝反应的选择性增加，从而与通常的技术相当的还原剂的量使脱硝能力增强，从而 能够高效率地进行废气处理。 通过使催化剂与添加了作为还原剂的醇的燃烧废气接触来净化排气中的氮氧化物的燃烧废气的净化方法中使用的脱硝催化剂含有沸石作为负载的载体 在催化剂金属的粉末X射线衍射（XRD）测量中，脱硝催化剂的衍射角（2π）处的衍射峰的高度I的比（相对峰强度比）r = I / J 从7.8至10.0度，衍射角（2¸）为28.0至31.0度的衍射峰的高度J在3.0至5.0的范围内。

    VERFAHREN ZUR BESEITIGUNG VON N2O UND NOX AUS DEM PROZESS ZUR SALPETERSÄUREHERSTELLUNG UND DAFÜR GEEIGNETE ANLAGE
    8.
    发明公开
    VERFAHREN ZUR BESEITIGUNG VON N2O UND NOX AUS DEM PROZESS ZUR SALPETERSÄUREHERSTELLUNG UND DAFÜR GEEIGNETE ANLAGE 有权
    程序的去除NOx N2O和过程OUT硝酸生产和合适的投资

    公开(公告)号：EP2678270A1

    公开(公告)日：2014-01-01

    申请号：EP12706771.8

    申请日：2012-02-14

    Applicant: ThyssenKrupp Uhde GmbH

    Inventor： SCHWEFER, Meinhard ,  SIEFERT, Rolf ,  FUCHS, Jürgen ,  RUTHARDT, Klaus ,  GROVES, Michael

    IPC: C01B21/26 ,  C01B21/38 ,  B01D53/86

    CPC classification number: C01B21/40 ,  B01D53/8628 ,  B01D53/869 ,  B01D2255/2065 ,  B01D2255/20738 ,  B01D2255/20746 ,  B01D2255/20761 ,  B01D2255/502 ,  B01D2255/504 ,  B01D2257/402 ,  B01D2257/404 ,  B01J29/072 ,  B01J29/46 ,  B01J29/68 ,  B01J29/7615 ,  B01J2229/42 ,  C01B21/265 ,  C01B21/38 ,  Y02C20/10 ,  Y02P20/153

    Abstract: The invention relates to a method for producing nitric acid by catalytically oxidising NH
    3 with oxygen and then reacting the obtained ΝΟ
    x with an absorption agent in an absorption tower, said tower comprising a catalyst bed for N
    2 O decomposition arranged in the process gas after the catalytic NH
    3 oxidation and before the absorption tower in the direction of flow, and a catalyst bed for ΝΟ
    x reduction and further N
    2 O reduction, arranged in the residual gas after the absorption tower in the direction of flow. In the catalyst bed for N
    2 O decomposition that is arranged in the process gas, as much N
    2 O as possible is broken down such that before the residual gas enters the catalyst bed for ΝΟ
    x reduction, the N
    2 O content is at > 100 ppmv and a molar N
    2 O/ΝΟ
    x ratio of > 0.25 is the result; the catalyst bed for ΝΟ
    x reduction and further N
    2 O reduction, arranged in the residual gas, containing at least one zeolite catalyst loaded with iron; there being such an amount of NH
    3 added to the residual gas prior to entry into the catalyst bed that upon exit from the catalyst bed, an ΝΟ
    x concentration of 2 O concentration of 2 O, formed during the catalytic NH
    3 oxidation, is catalytically removed in the process gas, with the ΝΟ
    x content being reduced and the N
    2 O content being further reduced in the residual gas, downstream of the absorption tower, and which is characterised in that at least the following elements are present: A) a reactor for the catalytic oxidation of NH
    3 with oxygen to produce a process gas containing ΝΟ
    x , B) an absorption tower for reacting the obtained ΝΟ
    x from the process gas with an absorption agent, a residual gas containing ΝΟ
    x and N
    2 O being the result, C) at least one first catalyst bed for N
    2 O decomposition through which the process gas flows and which is arranged after the catalytic NH
    3 oxidation and before the absorption tower in the direction of flow, D) at least one second catalyst bed for ΝΟ
    x reduction and further N
    2 O reduction, through which the residual gas flows and which is arranged after the absorption tower in the direction of flow, E) at least one device, for feeding a gaseous reduction agent into the residual gas, arranged after the absorption tower and before the second catalyst bed in the direction of flow, F) the first catalyst bed containing a catalyst for decomposing N
    2 O, and G) the second catalyst bed containing a catalyst which contains at least one zeolite loaded with iron. The method and installation allow N
    2 O and ΝΟ
    x emissions from nitric acid installations to be reduced in a particularly efficient manner.

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