JP2016150327A - Deterioration method of nox selective reduction catalyst - Google Patents
Deterioration method of nox selective reduction catalyst Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 100
- 230000009467 reduction Effects 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000006866 deterioration Effects 0.000 title abstract description 20
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 36
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 26
- 239000011574 phosphorus Substances 0.000 claims abstract description 26
- 231100000572 poisoning Toxicity 0.000 claims abstract description 20
- 230000000607 poisoning effect Effects 0.000 claims abstract description 20
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 18
- 238000002485 combustion reaction Methods 0.000 claims abstract description 16
- 230000000593 degrading effect Effects 0.000 claims description 12
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 5
- 230000002542 deteriorative effect Effects 0.000 abstract 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 231
- 238000006722 reduction reaction Methods 0.000 description 69
- 239000000243 solution Substances 0.000 description 32
- 235000011007 phosphoric acid Nutrition 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 238000000746 purification Methods 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000007654 immersion Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- -1 more specifically Chemical compound 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
本発明は、ＮＯｘ選択還元触媒の劣化方法に関し、より詳細には、リン被毒によってＮＯｘ選択還元触媒を劣化させる方法に関する。 The present invention relates to a method for degrading a NOx selective reduction catalyst, and more particularly to a method for degrading a NOx selective reduction catalyst by phosphorus poisoning.
従来、内燃機関の排気浄化触媒の劣化を評価するために、排気浄化触媒を強制的に劣化させることが行われている。また、近年では、ＯＢＤ（On-Board Diagnostics；自己診断機能）用として排気浄化触媒の劣化品を作成することも要求されてきている。排気浄化触媒を劣化させる手法として、例えば特許文献１には、排気浄化触媒としての三元触媒を電気炉内において加熱することで、三元触媒を高温雰囲気下に晒して強制的に劣化させる手法が開示されている。 Conventionally, in order to evaluate the deterioration of an exhaust purification catalyst of an internal combustion engine, the exhaust purification catalyst is forcibly deteriorated. In recent years, it has also been required to produce a deteriorated exhaust purification catalyst for OBD (On-Board Diagnostics). As a technique for degrading an exhaust purification catalyst, for example, Patent Document 1 discloses a technique in which a three-way catalyst as an exhaust purification catalyst is heated in an electric furnace to expose the three-way catalyst to a high temperature atmosphere and forcibly deteriorate the three-way catalyst. Is disclosed.
ところで、排気浄化触媒として、内燃機関の排気中のＮＯｘ（窒素酸化物）を選択的に還元するＮＯｘ選択還元触媒を用いる場合がある。そこで、特許文献１に係る劣化手法を応用して、電気炉を用いてＮＯｘ選択還元触を劣化させる場合、設備投資に高いコストがかかってしまう。また、電気炉を用いてＮＯｘ選択還元触媒を劣化させる場合、電気炉内にてＮＯｘ選択還元触媒を長時間加熱する必要があるため、劣化に長時間を要してしまう。 By the way, a NOx selective reduction catalyst that selectively reduces NOx (nitrogen oxide) in the exhaust gas of an internal combustion engine may be used as the exhaust purification catalyst. Therefore, when the deterioration method according to Patent Document 1 is applied and the NOx selective reduction catalyst is deteriorated using an electric furnace, the capital investment is expensive. Further, when the NOx selective reduction catalyst is deteriorated using an electric furnace, the NOx selective reduction catalyst needs to be heated in the electric furnace for a long time.
本発明は、上記のことを鑑みてなされたものであり、その目的は、ＮＯｘ選択還元触媒を低コスト且つ短時間で劣化させることができるＮＯｘ選択還元触媒の劣化方法を提供することである。 The present invention has been made in view of the above, and an object of the present invention is to provide a NOx selective reduction catalyst deterioration method capable of degrading a NOx selective reduction catalyst in a short time at a low cost.
上記の目的を達成するための本発明のＮＯｘ選択還元触媒の劣化方法は、内燃機関の排気中のＮＯｘを選択的に還元するＮＯｘ選択還元触媒を劣化させる方法であって、リン酸を含んだ溶液を用いて前記ＮＯｘ選択還元触媒をリン被毒させるリン被毒工程を含むことを特徴とするものである。 A method for degrading a NOx selective reduction catalyst of the present invention for achieving the above object is a method for degrading a NOx selective reduction catalyst that selectively reduces NOx in exhaust gas of an internal combustion engine, and includes phosphoric acid. It includes a phosphorus poisoning step in which the NOx selective reduction catalyst is poisoned with phosphorus using a solution.
本発明に係るＮＯｘ選択還元触媒の劣化方法によれば、電気炉を用いることなくＮＯｘ選択還元触媒を劣化させることができることから、ＮＯｘ選択還元触媒を低コスト且つ短時間で劣化させることができる。 According to the method for degrading a NOx selective reduction catalyst according to the present invention, the NOx selective reduction catalyst can be degraded without using an electric furnace, so that the NOx selective reduction catalyst can be degraded at a low cost and in a short time.
上記方法において、前記リン酸を含んだ溶液はリン酸水素二ナトリウムを含んだ溶液であってもよい。リン酸水素二ナトリウムはリン酸を含んだ種々の溶液の中において相対的に入手し易く且つ安価である。したがって、この方法によれば、ＮＯｘ選択還元触媒を容易に且つより低コストで劣化させることができる。 In the above method, the solution containing phosphoric acid may be a solution containing disodium hydrogen phosphate. Disodium hydrogen phosphate is relatively readily available and inexpensive in various solutions containing phosphoric acid. Therefore, according to this method, the NOx selective reduction catalyst can be easily degraded at a lower cost.
上記方法において、前記リン被毒工程は、前記リン酸を含んだ溶液に前記ＮＯｘ選択還元触媒を浸漬することを含んでいてもよい。この方法によれば、ＮＯｘ選択還元触媒を容易に且つ確実に劣化させることができる。 In the above method, the phosphorus poisoning step may include immersing the NOx selective reduction catalyst in a solution containing the phosphoric acid. According to this method, the NOx selective reduction catalyst can be easily and reliably deteriorated.
本発明に係るＮＯｘ選択還元触媒の劣化方法によれば、ＮＯｘ選択還元触媒を低コスト且つ短時間で劣化させることができる。 According to the degradation method of the NOx selective reduction catalyst according to the present invention, the NOx selective reduction catalyst can be degraded at a low cost and in a short time.
以下、本発明に係る実施の形態のＮＯｘ選択還元触媒の劣化方法について図面を参照しつつ説明する。 Hereinafter, a method for degrading a NOx selective reduction catalyst according to an embodiment of the present invention will be described with reference to the drawings.
最初に本実施形態に係るＮＯｘ選択還元触媒の劣化方法（以下、触媒劣化方法と略称する）に用いられるＮＯｘ選択還元触媒について説明し、次いで本実施形態に係る触媒劣化方法について説明する。図１はＮＯｘ選択還元触媒５が適用された内燃機関システム１の模式図である。内燃機関システム１は、内燃機関２と、内燃機関２に吸入される吸気が通過する吸気通路３と、内燃機関２から排出された排気が通過する排気通路４とを備えている。また内燃機関システム１は、排気通路４に配置されたＮＯｘ選択還元触媒５と、排気通路４のＮＯｘ選択還元触媒５よりも上流側に配置された噴射部６とを備えている。噴射部６は、内燃機関システム１の制御装置としての機能を有するＥＣＵ（Engine Control Unit）からの指示を受けて、尿素水溶液を排気通路４内に噴射する。 First, the NOx selective reduction catalyst used in the NOx selective reduction catalyst deterioration method according to this embodiment (hereinafter abbreviated as catalyst deterioration method) will be described, and then the catalyst deterioration method according to this embodiment will be described. FIG. 1 is a schematic diagram of an internal combustion engine system 1 to which a NOx selective reduction catalyst 5 is applied. The internal combustion engine system 1 includes an internal combustion engine 2, an intake passage 3 through which intake air taken into the internal combustion engine 2 passes, and an exhaust passage 4 through which exhaust exhausted from the internal combustion engine 2 passes. The internal combustion engine system 1 includes a NOx selective reduction catalyst 5 disposed in the exhaust passage 4 and an injection unit 6 disposed on the upstream side of the NOx selective reduction catalyst 5 in the exhaust passage 4. The injection unit 6 injects an aqueous urea solution into the exhaust passage 4 in response to an instruction from an ECU (Engine Control Unit) having a function as a control device of the internal combustion engine system 1.
ＮＯｘ選択還元触媒５は、排気中のＮＯｘを選択的に還元する触媒である。このような機能を有する触媒であれば、ＮＯｘ選択還元触媒５の具体的な種類は特に限定されるものではなく、例えば、バナジウム、モリブデン、タングステン等の卑金属酸化物や、ゼオライト等、周知のＮＯｘ選択還元触媒（ＳＣＲ触媒）を用いることができる。本実施形態においては、ＮＯｘ選択還元触媒５の一例として、ゼオライトを用いる。 The NOx selective reduction catalyst 5 is a catalyst that selectively reduces NOx in the exhaust gas. As long as the catalyst has such a function, the specific type of the NOx selective reduction catalyst 5 is not particularly limited. For example, base metal oxides such as vanadium, molybdenum, and tungsten; A selective reduction catalyst (SCR catalyst) can be used. In the present embodiment, zeolite is used as an example of the NOx selective reduction catalyst 5.
噴射部６から排気通路４に噴射された尿素水溶液は加水分解されてアンモニアに変化する。このアンモニアは、ＮＯｘ選択還元触媒５に吸着している排気中のＮＯｘをＮＯｘ選択還元触媒５の触媒作用を利用して還元させる。それにより、ＮＯｘは窒素と水とに分解する。このようにして、ＮＯｘの大気への放出が抑制されている。 The aqueous urea solution injected from the injection unit 6 into the exhaust passage 4 is hydrolyzed and changed to ammonia. This ammonia reduces NOx in the exhaust gas adsorbed on the NOx selective reduction catalyst 5 by utilizing the catalytic action of the NOx selective reduction catalyst 5. Thereby, NOx is decomposed into nitrogen and water. In this way, release of NOx into the atmosphere is suppressed.
なお、上述した尿素水を用いたＮＯｘの一連の浄化作用を化学式で示すと以下の式（１）〜式（４）のようになる。式（１）はアンモニアの加水分解を示し、式（２）〜式（４）がアンモニアによるＮＯｘの還元反応を示している。
（ＮＨ２）２ＣＯ＋Ｈ２Ｏ→２ＮＨ３＋ＣＯ２・・・（１）
２ＮＨ３＋ＮＯ＋ＮＯ２→２Ｎ２＋３Ｈ２Ｏ・・・（２）
４ＮＯ＋４ＮＨ３＋Ｏ２→４Ｎ２＋６Ｈ２Ｏ・・・（３）
６ＮＯ＋８ＮＨ３→７Ｎ２＋１２Ｈ２Ｏ・・・（４）
In addition, when a series of purification actions of NOx using the urea water described above are represented by chemical formulas, the following formulas (1) to (4) are obtained. Formula (1) indicates the hydrolysis of ammonia, and Formulas (2) to (4) indicate the reduction reaction of NOx with ammonia.
(NH 2 ) 2 CO + H 2 O → 2NH 3 + CO 2 (1)
2NH 3 + NO + NO 2 → 2N 2 + 3H 2 O (2)
4NO + 4NH 3 + O 2 → 4N 2 + 6H 2 O (3)
6NO + 8NH 3 → 7N 2 + 12H 2 O (4)
続いて本実施形態に係る触媒劣化方法について説明する。図２は本実施形態に係る触媒劣化方法を説明するための模式図である。本実施形態に係る触媒劣化方法は、リン酸を含んだ溶液２０を用いてＮＯｘ選択還元触媒５をリン被毒させるリン被毒工程を含んでいる。リン被毒工程においては、容器１０の中にリン酸を含んだ溶液２０を入れ、溶液２０中にＮＯｘ選択還元触媒５を浸漬する。具体的には図２においては、溶液２０の入った容器１０の底部にＮＯｘ選択還元触媒５を配置することでＮＯｘ選択還元触媒５を溶液２０に浸漬している。ＮＯｘ選択還元触媒５が溶液２０に浸漬されることで、ＮＯｘ選択還元触媒５は溶液２０中のリンによって被毒（リン被毒）される。それにより、ＮＯｘ選択還元触媒５は劣化する。
Next, the catalyst deterioration method according to this embodiment will be described. FIG. 2 is a schematic diagram for explaining the catalyst deterioration method according to the present embodiment. The catalyst deterioration method according to the present embodiment includes a phosphorus poisoning step in which the NOx selective reduction catalyst 5 is poisoned with phosphorus using a
溶液２０としては、例えばリン酸（H3PO4）の水溶液、リン酸ナトリウム（Na3PO4）の水溶液、リン酸水素二ナトリウム（Na2HPO4）の水溶液等、リン酸を含んだ種々の溶液を用いることができる。このうち、リン酸水素二ナトリウムは、これらのリン酸を含んだ溶液の中でも相対的に入手し易く且つ安価である。
Examples of the
そこで、本実施形態においては、溶液２０の一例として、リン酸水素二ナトリウムを含んだ溶液、より具体的にはリン酸水素二ナトリウム・１２水（Na2HPO4・12H2O）をお湯に溶解したものを用いる。なお、リン酸水素二ナトリウム・１２水は水にも溶解するが、低温の水よりもお湯（室温よりも高い温度の水）の方が容易に溶解するため、溶液２０として、リン酸水素二ナトリウム・１２水をお湯に溶解したものを用いることが好ましい。
Therefore, in this embodiment, as an example of the
溶液２０中のリン酸濃度及びＮＯｘ選択還元触媒５の浸漬時間は、例えば次の観点で設定すればよい。溶液２０中のリン酸濃度が高いほどＮＯｘ選択還元触媒５のリン被毒に要する時間を短縮することができる。また、ＮＯｘ選択還元触媒５の浸漬時間が長いほど、ＮＯｘ選択還元触媒５のリン被毒度合を大きくすることができる。そこで、以上の観点を考慮して、より短時間で目標とするリン被毒度合になるようなリン酸濃度及び浸漬時間を設定すればよい。
The phosphoric acid concentration in the
なお、具体的な数値例を挙げると、例えば本実施形態のように溶液２０としてリン酸水素二ナトリウム・１２水の水溶液を用いた場合、当該水溶液中におけるリン酸水素二ナトリウム・１２水の濃度が３〜７ｗｔ％（重量％）であれば、ＮＯｘ選択還元触媒５を３０分間浸漬させるだけで、ＮＯｘ選択還元触媒５の全体を十分にリン被毒させることができる。
For example, when an aqueous solution of disodium hydrogen phosphate / 12 water is used as the
また、リン被毒工程においては、ＮＯｘ選択還元触媒５を溶液２０内でひっくり返しながらリン被毒させることが好ましい。この具体例を挙げると、例えば溶液２０内に配置されたＮＯｘ選択還元触媒５を１０分毎にひっくり返しながら合計３０分間浸漬することが好ましい。これにより、ＮＯｘ選択還元触媒５の全体を効率的にリン被毒させることができる。
Further, in the phosphorus poisoning step, it is preferable that the NOx selective reduction catalyst 5 is poisoned with phosphorus while being turned over in the
なお、リン被毒工程は、上述したような、ＮＯｘ選択還元触媒５を溶液２０中に浸漬する手法に限定されるものではない。リン被毒工程の他の例を挙げると、ＮＯｘ選択還元触媒５の排気の流通通路に溶液２０を流し込むことによって、ＮＯｘ選択還元触媒５をリン被毒させてもよい。あるいは、溶液２０をＮＯｘ選択還元触媒５の排気の流通通路にスプレーすることによって、ＮＯｘ選択還元触媒５をリン被毒させてもよい。但し、本実施形態のようにＮＯｘ選択還元触媒５を溶液２０中に浸漬することでリン被毒させる手法は、その他の手法に比較して、ＮＯｘ選択還元触媒５を容易に且つ確実に劣化させることができる点で好ましい。
Note that the phosphorus poisoning step is not limited to the method of immersing the NOx selective reduction catalyst 5 in the
なお、リン被毒工程によって劣化させたＮＯｘ選択還元触媒５の劣化度合の評価は例えば次のように行われる。具体的には、リン被毒工程によって劣化させたＮＯｘ選択還元触媒５を図１に示すような内燃機関システム１に取り付けて、排気中のＮＯｘをＮＯｘ選択還元触媒５によって選択的に還元させる。そして、このときのＮＯｘの還元度合を測定することで、劣化度合を評価する。具体的には、ＮＯｘの還元度合が低いほど、劣化度合いは高いと評価される。 The evaluation of the degree of deterioration of the NOx selective reduction catalyst 5 that has been deteriorated by the phosphorus poisoning process is performed as follows, for example. Specifically, the NOx selective reduction catalyst 5 deteriorated by the phosphorus poisoning process is attached to the internal combustion engine system 1 as shown in FIG. 1, and NOx in the exhaust is selectively reduced by the NOx selective reduction catalyst 5. Then, the degree of deterioration is evaluated by measuring the degree of NOx reduction at this time. Specifically, the lower the degree of NOx reduction, the higher the degree of deterioration.
以上説明したように、本実施形態に係る触媒劣化方法によれば、リン酸を含んだ溶液２０を用いてＮＯｘ選択還元触媒５をリン被毒させることができることから、電気炉を用いることなくＮＯｘ選択還元触媒５を劣化させることができる。それにより、設備投資に高いコストがかかることを抑制できるとともに、短時間で（例えば本実施形態のように３０分程度）でＮＯｘ選択還元触媒５を劣化させることができる。
As described above, according to the catalyst deterioration method according to the present embodiment, the NOx selective reduction catalyst 5 can be phosphorus-poisoned using the
また本実施形態に係る触媒劣化方法によれば、リン酸を含んだ溶液２０として、入手が容易で且つ安価であるリン酸水素二ナトリウムを含んだ溶液を用いていることから、ＮＯｘ選択還元触媒５を容易に且つより低コストで劣化させることができる。
Further, according to the catalyst deterioration method according to the present embodiment, the NOx selective reduction catalyst is used because the
また本実施形態に係る触媒劣化方法によれば、図２において説明したように、リン被毒工程はリン酸を含んだ溶液２０にＮＯｘ選択還元触媒５を浸漬することを含んでいることから、ＮＯｘ選択還元触媒５を容易に且つ確実に劣化させることを容易に行える。
Further, according to the catalyst deterioration method according to the present embodiment, as explained in FIG. 2, the phosphorus poisoning step includes immersing the NOx selective reduction catalyst 5 in the
以上本発明の好ましい実施形態について説明したが、本発明はかかる特定の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の要旨の範囲内において、種々の変形・変更が可能である。 Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.
１ 内燃機関システム
２ 内燃機関
３ 吸気通路
４ 排気通路
５ ＮＯｘ選択還元触媒
６ 噴射部
２０ 溶液
DESCRIPTION OF SYMBOLS 1 Internal combustion engine system 2 Internal combustion engine 3 Intake passage 4 Exhaust passage 5 NOx selective reduction catalyst 6
Claims (3)
リン酸を含んだ溶液を用いて前記ＮＯｘ選択還元触媒をリン被毒させるリン被毒工程を含むことを特徴とするＮＯｘ選択還元触媒の劣化方法。 A method of degrading a NOx selective reduction catalyst that selectively reduces NOx in exhaust gas of an internal combustion engine,
A method for degrading a NOx selective reduction catalyst, comprising a phosphorus poisoning step in which the NOx selective reduction catalyst is poisoned with phosphorus using a solution containing phosphoric acid.
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