JP3271782B2 - Nitrogen oxide removal agent and removal method - Google Patents
Nitrogen oxide removal agent and removal methodInfo
- Publication number
- JP3271782B2 JP3271782B2 JP05011792A JP5011792A JP3271782B2 JP 3271782 B2 JP3271782 B2 JP 3271782B2 JP 05011792 A JP05011792 A JP 05011792A JP 5011792 A JP5011792 A JP 5011792A JP 3271782 B2 JP3271782 B2 JP 3271782B2
- Authority
- JP
- Japan
- Prior art keywords
- nox
- removal
- nitrogen oxide
- remover
- agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 13
- 239000003795 chemical substances by application Substances 0.000 title description 3
- 239000007789 gas Substances 0.000 claims description 7
- 229910052788 barium Inorganic materials 0.000 claims description 6
- 229910052712 strontium Inorganic materials 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 3
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、燃焼排ガス等の中に含
まれる窒素酸化物（以下ＮＯｘと称する）を除去する除
去剤およびその除去剤を使用するＮＯｘの除去方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remover for removing nitrogen oxides (hereinafter referred to as NOx) contained in flue gas and the like and a method for removing NOx using the remover.
【０００２】[0002]
【従来の技術】各種燃焼器からの排ガスには、多量の酸
素とともにＮＯｘが含まれており、ＮＯｘは光化学スモ
ッグの原因となるだけでなく人体にとって呼吸器系に障
害を起こすといわれている。ＮＯｘを無害なＮ2にまで
還元するプロセスについては、自動車等を対象として、
ＣＯあるいは各種炭化水素（ＨＣ）等の還元剤を用いて
ＮＯをＮ2にする、いわゆる三元触媒方式が確立される
とともに、プラント等で採用される方法として、アンモ
ニアを還元剤として用いるプロセスが確立されている。2. Description of the Related Art Exhaust gas from various combustors contains NOx together with a large amount of oxygen, and it is said that NOx not only causes photochemical smog but also causes damage to the respiratory system for the human body. Regarding the process of reducing NOx to harmless N 2 ,
A so-called three-way catalyst system for converting NO into N 2 using a reducing agent such as CO or various hydrocarbons (HC) has been established, and a process using ammonia as a reducing agent has been adopted as a method adopted in plants and the like. Established
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、三元触
媒方式では、ＣＯあるいは炭化水素を別途に準備する必
要があり、装置が煩雑となり、コスト高となる。一方、
アンモニアを使用する場合は、汚染の可能性があり、室
内空間で使用することができないなどの問題がある。そ
して、従来から各種還元剤を用いずにＮＯｘを直接分解
する方法の開発が望まれているものの実用レベルで確立
されたものはない。従って本発明の目的は、ＮＯｘを直
接分解により処理し、ＮＯｘを除去することが可能な除
去剤を得るとともに、これを使用するＮＯｘの除去方法
を得ることである。However, in the three-way catalyst system, it is necessary to prepare CO or hydrocarbon separately, which makes the apparatus complicated and increases the cost. on the other hand,
When ammonia is used, there is a problem that it may be contaminated and cannot be used in an indoor space. Although it has been desired to develop a method for directly decomposing NOx without using various reducing agents, there is no method established at a practical level. Therefore, an object of the present invention is to obtain a remover capable of removing NOx by directly treating NOx by decomposition, and to obtain a NOx removal method using the same.
【０００４】[0004]
【課題を解決するための手段】この目的を達成するため
の本発明による窒素酸化物の除去剤の特徴構成は、これ
が、一般式 ＭＣｅＯx （式中のｘは１〜３であり、Ｍはバリウム、ストロンチ
ウム、マグネシウムからなる群から選ばれた少なくとも
１種の金属を示す）を主剤とすることである。さらに、
本発明による窒素酸化物の除去方法の特徴手段は、前述
の窒素酸化物の除去剤を７００℃以上に設定しながら、
除去剤に窒素酸化物含有ガスを接触させて窒素酸化物を
除去することにあり、その作用・効果は次の通りであ
る。The feature of the nitrogen oxide remover according to the present invention for achieving this object is that it has a general formula of MCeO x (where x is 1 to 3, and M is At least one metal selected from the group consisting of barium, strontium, and magnesium). further,
The characteristic means of the method for removing nitrogen oxides according to the present invention is characterized in that the nitrogen oxide remover is set at 700 ° C. or higher,
The purpose of the present invention is to remove nitrogen oxides by bringing a nitrogen oxide-containing gas into contact with the remover, and its operation and effects are as follows.
【０００５】[0005]
【作用】つまり、除去剤としてＭＣｅＯx（ｘ＝１〜
３、Ｍ：Ｂａ，Ｓｒ，Ｍｇ）等が使用されるのである
が、こういった化合物は、ペロブスカイト型化合物であ
り、高温域（７００℃以上の温度域）でペロブスカイト
構造中に含まれる酸素が脱離して形成した酸素欠陥がＮ
Ｏｘの直接分解に寄与するものと考えられる。実験デー
タについては、以下に示す。従って、こういった化合物
を、ＮＯｘが移送されてくる部位に配設しておき、この
部位を７００℃以上に設定しておくと、ＮＯｘが窒素と
酸素に直接分解されて、無害物として送り出されてく
る。In other words, MCeO x (x = 1 to 1)
3, M: Ba, Sr, Mg) and the like are used, and these compounds are perovskite-type compounds, and oxygen contained in the perovskite structure in a high temperature region (a temperature region of 700 ° C. or more) is reduced. Oxygen vacancies formed by elimination are N
It is thought to contribute to the direct decomposition of Ox. Experimental data is shown below. Therefore, if such a compound is disposed at a site where NOx is transferred and this site is set at 700 ° C. or higher, NOx is directly decomposed into nitrogen and oxygen and is sent out as a harmless substance. Come.
【０００６】[0006]
【発明の効果】従って、ＣＯ、炭化水素等の還元剤を必
要とすることなく、更には環境に有害なアンモニア等を
必要としないで、ＮＯｘを直接分解により処理すること
が可能な、ＮＯｘの除去剤及び除去方法を得ることがで
きた。Thus, NOx can be treated by direct decomposition without the need for reducing agents such as CO and hydrocarbons and without the need for environmentally harmful ammonia or the like. The removal agent and the removal method could be obtained.
【０００７】[0007]
【実施例】ＮＯｘの除去に際しては、ＮＯｘガスを含有
するガス流路内に、常温以上で酸素欠陥を形成するペロ
ブスカイト型化合物である一般式ＭＣｅＯx（ｘ＝１〜
３、Ｍ：Ｂａ，Ｓｒ，Ｍｇ、Ｃｅはセリウムを示す。）
で示される化合物(除去剤と呼ぶ）を粒子状のまま配設
する。そして、この配設部を７００℃以上に保温してお
く。このようにすると、ガス流路の配設部下流側ではＮ
Ｏｘが除去されて清浄なガスが送り出されてくる。以下
にＢａＣｅＯx（ｘ＝１〜３）についてさらに具体的に
示す。 化合物 ＢａＣｅＯx（ｘ＝１〜３）を１〜２
ｍｍの顆粒状に成形したもの、 反応温度 ９００℃ ＮＯｘ濃度 ３０００ｐｐｍ−（Ｎ2中） ＳＶ値 ５０００ｈ-1 結果 ＮＯｘ低減率 ２５％In removing NOx, a general formula MCeO x (x = 1 to 1), which is a perovskite-type compound that forms oxygen vacancies at normal temperature or higher, in a gas flow path containing NOx gas.
3. M: Ba, Sr, Mg, Ce represents cerium. )
(Referred to as a removing agent) is disposed in the form of particles. And this arrangement | positioning part is kept warm above 700 degreeC. In this way, N
Ox is removed and a clean gas is sent out. Hereinafter, BaCeO x (x = 1 to 3) will be described more specifically. Compound BaCeO x (x = 1 to 3)
mm, granules, reaction temperature 900 ° C NOx concentration 3000ppm- (in N 2 ) SV value 5000h -1 Result NOx reduction rate 25%
【０００８】〔実験例〕以下に本願に関係する実験例を
示す。ここで、対象とするものは、一般式ＭＣｅＯ
x（ｘ＝１〜３、Ｍ：Ｂａ，Ｓｒ，Ｍｇ，Ｃａ）のもの
である。これらはペロブスカイト型化合物であるが、そ
の昇温操作により構造中に含まれる酸素が脱離して酸素
欠陥の数が増加する。そして、この酸素欠陥がＮＯｘの
直接分解に対して有効に働く。[Experimental Examples] Experimental examples related to the present invention will be described below. Here, the target is the general formula MCeO
x (x = 1 to 3, M: Ba, Sr, Mg, Ca). These are perovskite-type compounds, and the number of oxygen defects increases due to the elimination of oxygen contained in the structure due to the temperature raising operation. This oxygen vacancy works effectively for the direct decomposition of NOx.
【０００９】図１にはこれらの化合物に関するＮＯｘ除
去率と反応温度との関係が示されている。図には、Ｂａ
ＣｅＯx（ｘ＝１〜３）の結果が○で、ＳｒＣｅＯx（ｘ
＝１〜３）の結果が●で、ＭｇＣｅＯx（ｘ＝１〜３）
の結果が△で、ＣａＣｅＯx（ｘ＝１〜３）の結果が□
で示されている（図３においても同じ）。さらに、ＮＯ
ｘ濃度は３０００ｐｐｍであり、ＳＶ値は５０００ｈ-1
に設定した。またグラフは、測定開始後２時間経過後の
値を示す。結果、夫々の化合物において、７００℃以上
の温度域において、ＮＯｘの直接分解による除去が観察
され、温度域が高い程除去率は上昇した。ＢａＣｅＯx
（ｘ＝１〜３）の除去率が最も高く、ＳｒＣｅＯx（ｘ
＝１〜３）、ＭｇＣｅＯx（ｘ＝１〜３）、ＣａＣｅＯx
（ｘ＝１〜３）の順で、除去性能が低下している。例え
ば、ＢａＣｅＯx（ｘ＝１〜３）を９００℃で使用した
場合は、２５％程度の除去が可能である。FIG. 1 shows the relationship between the NOx removal rate and the reaction temperature for these compounds. In the figure, Ba
The result of CeO x (x = 1 to 3) is ○, and SrCeO x (x
= 1 to 3) is the result of ●, and MgCeO x (x = 1 to 3)
Is △ and CaCeO x (x = 1 to 3) is □
(The same applies to FIG. 3). Furthermore, NO
The x concentration was 3000 ppm, and the SV value was 5000 h -1.
Set to. Further, the graph shows the value 2 hours after the start of the measurement. As a result, in each of the compounds, removal by direct decomposition of NOx was observed in a temperature range of 700 ° C. or higher, and the removal rate increased as the temperature range became higher. BaCeO x
(X = 1 to 3) has the highest removal rate, and SrCeO x (x
= 1 to 3), MgCeO x (x = 1 to 3), CaCeO x
The removal performance decreases in the order of (x = 1 to 3). For example, when BaCeO x (x = 1 to 3) is used at 900 ° C., removal of about 25% is possible.
【００１０】図２には、上記の結果において最高の除去
率を示したＢａＣｅＯx（ｘ＝１〜３）に関するＮＯｘ
除去率とＳＶ値との関係が示されている。ＮＯｘ濃度は
３０００ｐｐｍであり、グラフは、反応温度９００℃
で、測定開始後２時間経過後の値を示している。結果、
ＳＶ値の増加とともに、ＮＯｘ除去率は低下するが、５
０００ｈ-1で２５％程度の値を示しており、充分に実用
化可能なデータを示している。FIG. 2 shows NOx for BaCeO x (x = 1 to 3) showing the highest removal rate in the above results.
The relationship between the removal rate and the SV value is shown. The NOx concentration was 3000 ppm, and the graph shows a reaction temperature of 900 ° C.
Indicates a value two hours after the start of measurement. result,
As the SV value increases, the NOx removal rate decreases.
It shows a value of about 25% at 000h −1 , indicating data that can be sufficiently put into practical use.
【００１１】図３には夫々の化合物におけるＮＯｘ除去
率と経過時間との関係が、示されている。ＮＯｘ濃度は
３０００ｐｐｍ、反応温度は９００℃、ＳＶ値は５００
０ｈ -1に設定されている。結果、実験開始後、２時間程
度までは除去性能の低下が認められるが、それ以後１０
時間に到るまで除去性能は一定値（ＢａＣｅＯxで２５
％，ＳｒＣｅＯxで１５％，ＭｇＣｅＯxで９．５％，Ｃ
ａＣｅＯxで１％程度である。）を維持し、連続して安
定した性能を維持した。FIG. 3 shows the removal of NOx from each compound.
The relationship between rate and elapsed time is shown. NOx concentration
3000 ppm, reaction temperature 900 ° C, SV value 500
0h -1Is set to Results, about 2 hours after the start of the experiment
Degree of removal performance is observed up to the degree,
The removal performance is a constant value (BaCeOxAt 25
%, SrCeOx15%, MgCeOxAt 9.5%, C
aCeOxAbout 1%. ) Maintain and continuously cheap
The specified performance was maintained.
【００１２】〔別実施例〕上記の実施例及び実験例にお
いては、金属として１種のみを含有したものを示した
が、酸素欠陥が備えられる意味からすれば、これらが複
数混在していても同様の作用・効果を得ることが可能と
考えられる。ここで、これら、酸素欠陥を有することと
なりうる化合物の一般式はＭＣｅＯ x（式中のｘは１〜
３であり、Ｍはバリウム、ストロンチウム、マグネシウ
ムからなる群から選ばれた少なくとも１種の金属を示
す）と表せる。さらに、このような化合物としては、使
用状態で前述の条件を満たしていればよく、その合成過
程における、出発原料物質は特に限定されるものではな
く、合成方法についても固相反応法、液相反応法等ある
がとくに限定するものではない。さらに化合物を粒子状
のままＮＯｘを含むガス中に配設しても、ハニカム状等
いかなる形状に成形して配設して、使用してもよい。[Another embodiment] In the above embodiment and experimental example,
And those containing only one type of metal
However, in the sense that oxygen vacancies are provided,
It is possible to obtain the same function and effect even if the numbers are mixed.
Conceivable. Here, those having oxygen defects
The general formula of the possible compound is MCeO x(X in the formula is 1 to
3, M is barium, strontium, magnesium
At least one metal selected from the group consisting of
). In addition, such compounds include
It is sufficient if the above conditions are satisfied in the use condition.
Starting material is not particularly limited.
There are also solid phase reaction methods, liquid phase reaction methods, etc.
However, there is no particular limitation. Further compound the particles
Even if it is disposed in a gas containing NOx as it is, it becomes
It may be formed into any shape, disposed, and used.
【００１３】尚、特許請求の範囲の項に図面との対照を
便利にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.
【図１】各化合物におけるＮＯｘ除去率と反応温度との
関係FIG. 1 shows the relationship between the NOx removal rate of each compound and the reaction temperature.
【図２】ＢａＣｅＯxにおけるＮＯｘ除去率とＳＶ値と
の関係FIG. 2 shows the relationship between the NOx removal rate and the SV value in BaCeO x .
【図３】各化合物におけるＮＯｘ除去率と経過時間との
関係FIG. 3 shows the relationship between NOx removal rate and elapsed time for each compound.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 森川 茂 京都府京都市下京区中道寺南町17 株式 会社関西新技術研究所内 (72)発明者 小林 孝 京都府京都市下京区中道寺南町17 株式 会社関西新技術研究所内 (56)参考文献 特開 昭63−305940（ＪＰ，Ａ) 国際公開92／4965（ＷＯ，Ａ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B01J 21/00 - 37/36 B01D 53/86 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Morikawa 17 Nakamichi-ji Minamicho, Shimogyo-ku, Kyoto, Kyoto Prefecture Inside the Kansai Research Institute of Technology (72) Inventor Takashi Kobayashi 17 Minami-ji, Minamimichi-cho, Kyoto, Kyoto (56) References JP-A-63-305940 (JP, A) WO 92/4965 (WO, A1) (58) Fields investigated (Int. Cl. 7 , DB name) B01J 21 / 00-37/36 B01D 53/86
Claims (2)
ウム、マグネシウムからなる群から選ばれた少なくとも
１種の金属を示す）を主剤とする窒素酸化物の除去剤。1. A nitrogen oxide containing a general formula MCeO x (where x is 1 to 3, and M represents at least one metal selected from the group consisting of barium, strontium, and magnesium). Remover.
上に設定しながら、前記除去剤に窒素酸化物含有ガスを
接触させて窒素酸化物を除去する窒素酸化物の除去方
法。2. A method for removing nitrogen oxides, comprising: bringing a nitrogen oxide-containing gas into contact with said remover while setting said remover at 700 ° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05011792A JP3271782B2 (en) | 1992-03-09 | 1992-03-09 | Nitrogen oxide removal agent and removal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05011792A JP3271782B2 (en) | 1992-03-09 | 1992-03-09 | Nitrogen oxide removal agent and removal method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05245371A JPH05245371A (en) | 1993-09-24 |
| JP3271782B2 true JP3271782B2 (en) | 2002-04-08 |
Family
ID=12850173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05011792A Expired - Fee Related JP3271782B2 (en) | 1992-03-09 | 1992-03-09 | Nitrogen oxide removal agent and removal method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3271782B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5168193B2 (en) * | 2008-03-24 | 2013-03-21 | 国立大学法人 熊本大学 | Particulate combustion catalyst, method for producing the same, and exhaust gas purifying filter |
| CN104981289A (en) * | 2013-02-08 | 2015-10-14 | 优美科触媒日本有限公司 | Catalyst for purifying NOX occlusion reduction-type exhaust gas and exhaust gas purification method using said catalyst |
-
1992
- 1992-03-09 JP JP05011792A patent/JP3271782B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05245371A (en) | 1993-09-24 |
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