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公开(公告)号：US20140363359A1
公开(公告)日：2014-12-11
申请号：US14365949
申请日：2012-12-08
申请人： Meinhard Schwefer , Rolf Siefert , Stefan Pinnow
发明人： Meinhard Schwefer , Rolf Siefert , Stefan Pinnow
IPC分类号： B01D53/86
CPC分类号： B01D53/869 , B01D53/8628 , B01D53/8631 , B01D53/8696 , B01D2255/1025 , B01D2255/20738 , B01D2255/20746 , B01D2255/20753 , B01D2255/20761 , B01D2255/50 , B01D2255/9202 , B01D2257/402 , B01D2257/404 , Y02C20/10
摘要： A device and a method are described for lowering the content of NOx and N2O in gases. The device comprises: A) a container (1) and, arranged therein, B) two reaction steps connected one after the other for removing NOx (DeNOx stage) by reducing NOx with a nitrogen-containing reducing agent and, downstream thereof, for removing N2O by catalytic decomposition of N2O to N2 and O2 (DeN2O stage), which each consist of one or more catalyst beds (7, 8) and through which the gas that is to be purified flows, wherein C) the at least one catalyst bed of the DeNOx stage (7) contains a catalyst for reducing NOx with nitrogen-containing reducing agents which catalyst contains zeolites doped with transition metals, including the lanthanides, D) the at least one catalyst bed of the DeN2O-stage (8) contains a catalyst for decomposing N2O into N2 and O2, which contains one or more catalytically active compounds of elements selected from groups 5 to 11 of the Periodic Table of the Elements with the exception of iron-doped zeolites, and E), upstream of the DeNOx stage (7), a device for introducing a nitrogen-containing reducing agent into the stream of the NOx and N2O-containing gas is provided. The combination used according to the invention of catalysts permits a very simple structure and a very economic operation of the reactor.
摘要翻译： 描述了用于降低气体中的NOx和N 2 O的含量的装置和方法。 该装置包括：A）一个容器（1），其中布置有B）两个反应步骤，一个接一个地连接，用于通过用含氮还原剂还原NO x，除去NO x（脱硝阶段） N 2 O通过N 2 O催化分解成N 2和O 2（DeN 2 O阶段），其各自由一个或多个催化剂床（7,8）组成，待净化的气体通过其流过，其中C）至少一个催化剂床 的脱硝阶段（7）含有用含氮还原剂还原NOx的催化剂，该催化剂含有掺杂有过渡金属的沸石，包括镧系元素，D）DeN2O级（8）的至少一个催化剂床含有 用于将N 2 O分解成N 2和O 2的催化剂，其含有一种或多种选自元素周期表第5至11族的元素的催化活性化合物，除铁掺杂沸石外，E）在DeNOx级上游 （7），一个装置 提供含氮还原剂到NOx和含N 2 O的气体流中。 根据本发明的催化剂使用的组合物允许反应器的非常简单的结构和非常经济的操作。
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2.发明授权公开(公告)号：US08871673B2
公开(公告)日：2014-10-28
申请号：US12733147
申请日：2008-07-11
CPC分类号： B01J23/86 , B01D53/8628 , B01D2255/206 , B01D2255/20746 , B01D2257/402 , B01J35/10 , B01J35/1014 , B01J35/1038 , B01J37/0205 , B01J37/0244 , Y02C20/10
摘要： Catalysts for the decomposition of N2O into nitrogen and oxygen in the gas phase, which comprises a porous support composed of polycrystalline or vitreous inorganic material, a cerium oxide functional layer applied thereto and a layer of oxidic cobalt-containing material applied thereto are described.The catalysts can be used, in particular, as secondary or tertiary catalysts in nitric acid plants.
摘要翻译： 描述了用于将N 2 O分解成氮气和气相中的氧的催化剂，其包括由多晶或玻璃质无机材料构成的多孔载体，施加于其上的氧化铈功能层和施加到其上的含氧化钴材料层。 催化剂特别可用于硝酸设备中的二级或三级催化剂。
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公开(公告)号：US20080044331A1
公开(公告)日：2008-02-21
申请号：US11740608
申请日：2007-04-26
申请人： Meinhard Schwefer , Joachim Motz , Rolf Siefert
发明人： Meinhard Schwefer , Joachim Motz , Rolf Siefert
CPC分类号： B01J29/46 , B01D53/8625 , B01D53/8628 , B01D2255/504 , B01D2257/402 , B01D2257/404 , B01D2259/401 , B01J2229/16 , C01B21/265 , Y02C20/10 , Y02P20/153
摘要： A method of reducing the content of NOx and N2O in gases using a gaseous reducing agent which is used in the amount required for reduction of the NOx in the presence of one or more iron-laden zeolites which have no pores or channels having a width of greater than or equal to 7 Ångström in the crystal structure and at temperatures of less than 450° C. in the reaction zone is described. In this method, the flow rate of the gas mixture and/or the amount of catalyst is/are selected so that the desired degree of decomposition of N2O is achieved. The method can be used, in particular, in nitric acid production, in power stations and in gas turbines.
摘要翻译： 使用以减少NO x所需量所用的气态还原剂来降低气体中NO x和N 2 O的含量的方法 在存在一种或多种不含孔或槽的含铁负载沸石的存在下，其在晶体结构中的宽度大于或等于7，在反应区中的温度低于450℃ 被描述。 在该方法中，选择气体混合物的流量和/或催化剂的量，以便实现N 2 O 2的所需分解度。 该方法特别可用于硝酸生产，发电站和燃气轮机中。
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公开(公告)号：US10022669B2
公开(公告)日：2018-07-17
申请号：US13700853
申请日：2011-05-09
IPC分类号： B01D53/56 , B01D53/86 , B01J29/072 , B01J29/46 , B01J37/00
摘要： A process for removing N2O and NOx from offgases by catalytic decomposition of N2O by means of iron-containing zeolite catalysts and catalytic reduction of the NOx by means of reducing agents, the deNOx stage connected downstream of the deN2O stage being operated at inlet temperatures of T
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公开(公告)号：US20120034148A1
公开(公告)日：2012-02-09
申请号：US12998775
申请日：2009-12-01
申请人： Meinhard Schwefer , Michael Groves , Jürgen Fuchs , Rainer Maurer , Rolf Siefert , Bernhard Hündgen
发明人： Meinhard Schwefer , Michael Groves , Jürgen Fuchs , Rainer Maurer , Rolf Siefert , Bernhard Hündgen
CPC分类号： B01J8/0285 , B01J8/008 , B01J8/025 , B01J8/0278 , B01J12/007 , B01J15/005 , B01J19/0013 , B01J19/002 , B01J19/2485 , B01J19/26 , B01J2208/00203 , B01J2208/00212 , B01J2208/00495 , B01J2208/00548 , B01J2208/00716 , B01J2219/00083 , B01J2219/00094 , B01J2219/00119 , B01J2219/00155 , B01J2219/00164 , B01J2219/00245 , B01J2219/32296 , B01J2219/324 , C01B21/26 , C01B21/267 , C01B21/28 , C01C3/022
摘要： Improved reactors for catalytic, exothermic gas phase reactions with, as seen in the flow direction of a feed gas, which contains at least one oxidant and at least one component to be oxidized, an entry zone (1), a reaction zone (2) comprising at least one catalyst (4) and an exit zone (3) for the product gas are described. The reactors, at least in the area of the entry zone (1), have means, for example insulating jackets (6) and/or devices for the transport of cooling agents, which decrease the transport of heat produced in the reaction zone (2) into the entry zone (1) and thus decrease the risks of pre-ignition of the feed gas mixture employed or of the course of undesired side reactions in the entry zone (1) and/or wherein the inner walls of the reactor, at least in the area of the entry zone (1), are elaborated from inert material.The feed gas enters into the entry zone (1) as a homogeneous gas mixture with respect to its substance composition via one or more feed lines (30).The reactors can especially be employed for ammonia oxidation, for example in nitric acid plants, in which transition metal catalysts preferably elaborated in honeycomb form with smaller cross sections than the customarily employed platinum gauzes are used.
摘要翻译： 如在进料气体的流动方向上看到的含有至少一种氧化剂和至少一种待氧化的组分的入口区域（1），反应区域（2）的改进的催化，放热气相反应器， 描述了至少一种用于产品气体的催化剂（4）和出口区（3）。 至少在进入区域（1）的区域中的反应器具有诸如用于输送冷却剂的绝缘套（6）和/或装置的装置，这减少了在反应区（2）中产生的热的传输 ）进入进入区（1），从而降低进料区（1）中所采用的进料气体混合物的预点火风险或不期望的副反应过程的风险，和/或其中反应器的内壁在 至少在进入区域（1）的区域，由惰性材料制成。 进料气体通过一个或多个进料管线（30）相对于其物质组合物作为均匀气体混合物进入入口区域（1）。 反应器可以特别用于氨氧化，例如在硝酸设备中，其中优选使用具有小于通常使用的铂网的横截面的蜂窝形式的过渡金属催化剂。
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公开(公告)号：US07462340B2
公开(公告)日：2008-12-09
申请号：US10516918
申请日：2003-06-10
申请人： Meinhard Schwefer , Michael Groves , Rolf Siefert , Rainer Maurer
发明人： Meinhard Schwefer , Michael Groves , Rolf Siefert , Rainer Maurer
CPC分类号： B01J29/7007 , B01D53/8628 , B01D2255/20738 , B01D2255/50 , B01D2257/402 , B01D2257/404 , B01J8/008 , B01J8/0411 , B01J8/0415 , B01J8/0453 , B01J29/08 , B01J29/14 , B01J29/18 , B01J29/24 , B01J29/46 , B01J29/65 , B01J29/68 , B01J29/7615 , B01J2208/00539 , B01J2208/00849 , B01J2208/025 , Y02C20/10
摘要： The disclosure involves a method for reducing the content of NOx and N2O in gases. The method includes the conduction of a gas containing N2O and NOX over a series of two catalyst beds containing of one or more zeolites charged with iron followed by the: addition of a reduction agent for NOX between the catalyst beds. The first catalyst bed reaction zone is used to degrade the N2O and the catalyst bed second reaction zone reduces the NOX and breaks down at least part of the remaining N2O. The inventive device comprises at least one radially traversed catalyst bed.
摘要翻译： 本公开涉及一种降低气体中NOx和N2O含量的方法。 该方法包括在含有一个或多个带有铁的沸石的一系列两个催化剂床上传导含有N 2 O和NO x的气体，然后在催化剂床之间加入NO x还原剂。 第一催化剂床反应区用于降解N2O，催化剂床第二反应区减少NO x并分解剩余的N2O的至少一部分。 本发明的装置包括至少一个径向穿过的催化剂床。
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公开(公告)号：US20080241034A1
公开(公告)日：2008-10-02
申请号：US11913450
申请日：2006-04-27
申请人： Meinhard Schwefer , Rolf Siefert , Michael Groves
发明人： Meinhard Schwefer , Rolf Siefert , Michael Groves
IPC分类号： B01D53/56
CPC分类号： B01D53/8628 , B01D2251/202 , B01D2251/204 , B01D2251/2062 , B01D2251/208 , B01D2255/20738 , B01D2255/50 , B01D2257/402 , B01D2257/404 , Y02C20/10
摘要： The method comprises passing an N2O- and NOx-containing gas over a sequence of two catalyst beds, adding reducing agents for NOx and for N2O between the catalyst beds in such an amount that not only NOx but also a predetermined proportion of N2O is reduced. The reaction conditions are set so that the N2O content of the gas is reduced by not more than 95%, based on the N2O content at the entrance of the first catalyst bed, by decomposition to nitrogen and oxygen in the first catalyst bed and that not only chemical reduction of NOx but also chemical reduction of N2O occurs in the second catalyst bed so that the N2O content of the gas is reduced by at least 50%, based on the N2O content at the entrance of the second catalyst bed.
摘要翻译： 该方法包括在两个催化剂床的序列上通过含N 2 O和NO x-x N的气体，向其中加入还原剂， 并且催化剂床之间的N 2 O 2的量不仅仅是NO 2 x N 2，而且N 2 O 2的预定比例减少 。 设定反应条件使得气体的N 2 O 2 O含量基于在入口处的N 2 O 2含量降低不超过95％ 第一催化剂床，通过在第一催化剂床中分解成氮气和氧气，并且不仅在第二催化剂床中发生NO 2 X的化学还原，而且还发生N 2 O 2的化学还原 催化剂床，使得气体的N 2 O 2 O含量基于第二催化剂床入口处的N 2 O 2含量降低至少50％。
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公开(公告)号：US09738521B2
公开(公告)日：2017-08-22
申请号：US13984921
申请日：2012-02-14
IPC分类号： C01B21/40 , B01J29/072 , C01B21/38 , C01B21/26 , B01D53/86 , B01J29/76 , B01J29/46 , B01J29/68
CPC分类号： 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
摘要： The invention relates to a process and apparatus for preparing nitric acid by catalytic oxidation of NH3 by means of oxygen and subsequent reaction of the NOx formed with an absorption medium in an absorption tower, which comprises a catalyst bed for N2O decomposition arranged in the process gas downstream of the catalytic NH3 oxidation and upstream of the absorption tower in the flow direction and a catalyst bed for NOx reduction and effecting a further decrease in the amount of N2O arranged in the tailgas downstream of the absorption tower in the flow direction, wherein the amount of N2O removed in the catalyst bed for N2O removal arranged in the process gas is not more than that which results in an N2O content of >100 ppmv and a molar N2O/NOx ratio of >0.25 before entry of the tailgas into the catalyst bed for NOx reduction and the catalyst bed for NOx reduction and effecting a further decrease in the amount of N2O arranged in the tailgas contains at least one iron-loaded zeolite catalyst and NH3 is added to the tailgas before entry into the catalyst bed in such an amount that an NOx concentration of
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公开(公告)号：US09266081B2
公开(公告)日：2016-02-23
申请号：US12998775
申请日：2009-12-01
申请人： Meinhard Schwefer , Michael Groves , Jürgen Fuchs , Rainer Maurer , Rolf Siefert , Bernhard Hündgen
发明人： Meinhard Schwefer , Michael Groves , Jürgen Fuchs , Rainer Maurer , Rolf Siefert , Bernhard Hündgen
IPC分类号： B01J19/00 , C01B21/26 , C01C3/02 , B01J8/02 , B01J8/00 , B01J12/00 , B01J15/00 , B01J19/24 , B01J19/26 , C01B21/28
CPC分类号： B01J8/0285 , B01J8/008 , B01J8/025 , B01J8/0278 , B01J12/007 , B01J15/005 , B01J19/0013 , B01J19/002 , B01J19/2485 , B01J19/26 , B01J2208/00203 , B01J2208/00212 , B01J2208/00495 , B01J2208/00548 , B01J2208/00716 , B01J2219/00083 , B01J2219/00094 , B01J2219/00119 , B01J2219/00155 , B01J2219/00164 , B01J2219/00245 , B01J2219/32296 , B01J2219/324 , C01B21/26 , C01B21/267 , C01B21/28 , C01C3/022
摘要： Improved reactors for catalytic, exothermic gas phase reactions with, as seen in the flow direction of a feed gas, which contains at least one oxidant and at least one component to be oxidized, an entry zone (1), a reaction zone (2) comprising at least one catalyst (4) and an exit zone (3) for the product gas are described. The reactors, at least in the area of the entry zone (1), have means, for example insulating jackets (6) and/or devices for the transport of cooling agents, which decrease the transport of heat produced in the reaction zone (2) into the entry zone (1) and thus decrease the risks of pre-ignition of the feed gas mixture employed or of the course of undesired side reactions in the entry zone (1) and/or wherein the inner walls of the reactor, at least in the area of the entry zone (1), are elaborated from inert material. The feed gas enters into the entry zone (1) as a homogeneous gas mixture with respect to its substance composition via one or more feed lines (30). The reactors can especially be employed for ammonia oxidation, for example in nitric acid plants, in which transition metal catalysts preferably elaborated in honeycomb form with smaller cross sections than the customarily employed platinum gauzes are used.
摘要翻译： 如在进料气体的流动方向上看到的含有至少一种氧化剂和至少一种待氧化的组分的入口区域（1），反应区域（2）的改进的催化，放热气相反应器， 描述了至少一种用于产物气体的催化剂（4）和出口区（3）。 至少在进入区域（1）的区域中的反应器具有诸如用于输送冷却剂的绝缘套（6）和/或装置的装置，这减少了在反应区（2）中产生的热的传输 ）进入进入区（1），从而降低进料区（1）中所采用的进料气体混合物的预点火风险或不期望的副反应过程的风险，和/或其中反应器的内壁在 至少在进入区域（1）的区域，由惰性材料制成。 进料气体通过一个或多个进料管线（30）相对于其物质组合物作为均匀气体混合物进入入口区域（1）。 反应器可以特别用于氨氧化，例如在硝酸设备中，其中优选使用具有小于通常使用的铂网的横截面的蜂窝形式的过渡金属催化剂。
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公开(公告)号：US09238196B2
公开(公告)日：2016-01-19
申请号：US14365949
申请日：2012-12-08
申请人： Meinhard Schwefer , Rolf Siefert , Stefan Pinnow
发明人： Meinhard Schwefer , Rolf Siefert , Stefan Pinnow
CPC分类号： B01D53/869 , B01D53/8628 , B01D53/8631 , B01D53/8696 , B01D2255/1025 , B01D2255/20738 , B01D2255/20746 , B01D2255/20753 , B01D2255/20761 , B01D2255/50 , B01D2255/9202 , B01D2257/402 , B01D2257/404 , Y02C20/10
摘要： Disclosed herein is a device and method for lowering the content of NOX and N2O in gases. The device comprises a container having therein two reaction steps connected in series. The first step removes NOX (DeNOX stage) by reducing NOX with a nitrogen-containing reducing agent. Downstream thereof, the second step removes N2O by catalytic decomposition of N2O to N2 and O2 (DeN2O stage). Each step comprises one or more catalyst beds through which flows gas to be purified. The catalyst bed of the DeNOX stage containing zeolites doped with transition metals, including lanthanides. The at least one catalyst bed of the DeN2O-stage contains one or more catalytically active compounds of elements selected from groups 5 to 11 of the Periodic Table, but not iron-doped zeolites. A device for introducing a nitrogen-containing reducing agent into the stream of the NOX and N2O-containing gas is further disposed upstream of the DeNOX stage.
摘要翻译： 本文公开了一种用于降低气体中的NO x和N 2 O的含量的装置和方法。 该装置包括其中具有串联连接的两个反应步骤的容器。 第一步通过用含氮还原剂还原NO x来除去NOX（脱硝阶段）。 在其下游，第二步通过将N 2 O催化分解成N 2和O 2（DeN 2 O阶段）来除去N 2 O。 每个步骤包括一个或多个催化剂床，待净化的气体流过该催化剂床。 DeNOX阶段的催化剂床含有掺杂过渡金属的沸石，包括镧系元素。 DeN2O阶段的至少一个催化剂床含有选自元素周期表第5至11族的元素的一种或多种催化活性化合物，但不包括掺铁沸石。 用于将含氮还原剂引入含NO x和含N 2 O的气体流中的装置进一步设置在DeNOX级的上游。
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