JP2020062627A - Ammonia cleaning catalyst - Google Patents
Ammonia cleaning catalyst Download PDFInfo
- Publication number
- JP2020062627A JP2020062627A JP2018197689A JP2018197689A JP2020062627A JP 2020062627 A JP2020062627 A JP 2020062627A JP 2018197689 A JP2018197689 A JP 2018197689A JP 2018197689 A JP2018197689 A JP 2018197689A JP 2020062627 A JP2020062627 A JP 2020062627A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- honeycomb substrate
- ammonia
- ammonia purification
- noble metal
- 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.)
- Pending
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 83
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 38
- 238000004140 cleaning Methods 0.000 title abstract 3
- 239000000758 substrate Substances 0.000 claims abstract description 39
- 239000011148 porous material Substances 0.000 claims abstract description 10
- 239000010970 precious metal Substances 0.000 claims abstract description 4
- 238000000746 purification Methods 0.000 claims description 27
- 229910000510 noble metal Inorganic materials 0.000 claims description 17
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 229910052741 iridium Inorganic materials 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 229910052703 rhodium Inorganic materials 0.000 claims description 3
- 229910052707 ruthenium Inorganic materials 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 abstract description 8
- 239000001272 nitrous oxide Substances 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 238000007254 oxidation reaction Methods 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 239000010457 zeolite Substances 0.000 description 5
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910021536 Zeolite Inorganic materials 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- 238000005470 impregnation Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229960001730 nitrous oxide Drugs 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 239000000599 controlled substance Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000013842 nitrous oxide Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
-
- 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
Abstract
Description
本発明は、自動車用のアンモニア浄化触媒に関する。 The present invention relates to an ammonia purification catalyst for automobiles.
一般にアンモニア浄化触媒は、ハニカム基材と、酸化触媒層と、ＳＣＲ（Selective Catalytic Reduction）触媒層を備える。 Generally, an ammonia purification catalyst includes a honeycomb substrate, an oxidation catalyst layer, and an SCR (Selective Catalytic Reduction) catalyst layer.
酸化触媒層では、アンモニアを窒素酸化物と水に分解する反応が起こる。ＳＣＲ触媒層は、生成した窒素酸化物（ＮＯx）を除去するために設けられる。具体的に、ＳＣＲ触媒層では、ＮＯxを窒素と水に分解する反応が起こる。この反応によりＮＯxは浄化される。 In the oxidation catalyst layer, a reaction that decomposes ammonia into nitrogen oxides and water occurs. The SCR catalyst layer is provided to remove the generated nitrogen oxide (NO x ). Specifically, in the SCR catalyst layer, a reaction that decomposes NO x into nitrogen and water occurs. This reaction purifies NO x .
しかしながら、従来のアンモニア浄化触媒は、余剰のアンモニアを酸化反応によって除去する過程で、規制物質であるＮＯxを生成し、また副生成物として一酸化二窒素（Ｎ2Ｏ）が生成するという問題がある（例えば、非特許文献１参照）。従って、アンモニア浄化触媒は、Ｎ2Ｏ及びＮＯxの生成が抑制されていることが望ましい。 However, the conventional ammonia purification catalyst is in the process of removing by oxidation the excess ammonia, a problem that generates NO x is controlled substances, also dinitrogen monoxide (N 2 O) is produced as a by-product (For example, refer to Non-Patent Document 1). Therefore, it is desirable that the ammonia purification catalyst suppress the production of N 2 O and NO x .
本発明は、アンモニアの酸化反応において、Ｎ2Ｏ及びＮＯxの生成を抑えることができる新規のアンモニア浄化触媒を提供することを目的とする。 An object of the present invention is to provide a novel ammonia purification catalyst capable of suppressing the production of N 2 O and NO x in the ammonia oxidation reaction.
上記課題を解決するために、本発明に係るアンモニア浄化触媒の一実施形態は、細孔及び壁面に貴金属が付着したハニカム基材と、前記ハニカム基材に塗布したＳＣＲ触媒層を備える。 In order to solve the above problems, one embodiment of an ammonia purification catalyst according to the present invention includes a honeycomb substrate having pores and wall surfaces on which a noble metal is attached, and an SCR catalyst layer applied to the honeycomb substrate.
貴金属が、Ｐｔ、Ｐｄ、Ｉｒ、Ｒｕ、Ｒｈ、Ａｕ、Ａｇからなる群のうち少なくとも１つを含むことが好ましい。 It is preferable that the noble metal contains at least one selected from the group consisting of Pt, Pd, Ir, Ru, Rh, Au, and Ag.
貴金属が、Ｐｔ及び／又はＰｄを含むことが好ましい。 It is preferable that the noble metal contains Pt and / or Pd.
Ｐｔの付着量が０．０５〜１ｇ／Ｌであることが好ましい。 The amount of Pt deposited is preferably 0.05 to 1 g / L.
本発明によれば、アンモニアの酸化反応において、Ｎ2Ｏ及びＮＯxの生成を抑えることができる新規のアンモニア浄化触媒を提供することができるようになった。 According to the present invention, it is possible to provide a novel ammonia purification catalyst capable of suppressing the production of N 2 O and NO x in the ammonia oxidation reaction.
＝＝実施形態＝＝
本実施形態は、細孔及び壁面に貴金属が付着したハニカム基材と、ハニカム基材に塗布したＳＣＲ触媒層を備える、アンモニア浄化触媒に関する。以下図１を用いて、本実施形態に係るアンモニア浄化触媒を詳細に説明する。図１は、ハニカム基材の一部のセル内部を拡大したものである。
== Embodiment ==
The present embodiment relates to an ammonia purification catalyst that includes a honeycomb base material in which a noble metal adheres to pores and walls and an SCR catalyst layer applied to the honeycomb base material. Hereinafter, the ammonia purification catalyst according to the present embodiment will be described in detail with reference to FIG. FIG. 1 is an enlarged view of the inside of a part of the cells of the honeycomb substrate.
［アンモニア浄化触媒］
アンモニア浄化触媒１０は、ハニカム基材１１、及びＳＣＲ触媒層１２を備える。
[Ammonia purification catalyst]
The ammonia purification catalyst 10 includes a honeycomb substrate 11 and an SCR catalyst layer 12.
［ハニカム基材］
ハニカム基材１１は、ＳＣＲ触媒層１２を塗布するための部材である。ハニカム基材１１には、細孔１３及び壁面１５が設けられている。
[Honeycomb substrate]
The honeycomb substrate 11 is a member for applying the SCR catalyst layer 12. The honeycomb base material 11 is provided with pores 13 and wall surfaces 15.
本明細書において「壁面」とは、ハニカム基材とＳＣＲ触媒層との接触面を指す。 In the present specification, the “wall surface” refers to the contact surface between the honeycomb substrate and the SCR catalyst layer.
ハニカム基材の材質は、当業者が適宜選択することができる。本実施形態に係るアンモニア浄化触媒においてハニカム基材の材質は、コージェライト、シリコンカーバイド、アルミノチタネートが好ましい。 The material of the honeycomb substrate can be appropriately selected by those skilled in the art. In the ammonia purification catalyst according to this embodiment, the material of the honeycomb substrate is preferably cordierite, silicon carbide, or alumino titanate.
ハニカム基材の形状は、当業者が適宜選択することができる。ハニカム基材の形状は、例えば、ハニカム型やウォールフロー型を採用することができる。 The shape of the honeycomb substrate can be appropriately selected by those skilled in the art. The shape of the honeycomb substrate may be, for example, a honeycomb type or a wall flow type.
［貴金属］
貴金属１４は、細孔１３及び壁面１５に付着する。
[Precious metal]
The noble metal 14 adheres to the pores 13 and the wall surface 15.
本明細書において「付着」とは、触媒担体粒子を介さずに貴金属がハニカム基材に担持している状態を指す。 As used herein, the term “adhesion” refers to a state in which a precious metal is supported on a honeycomb substrate without interposing catalyst carrier particles.
本明細書において「触媒担体粒子」とは、貴金属を担持させるための多孔質物質を指す。 In the present specification, the “catalyst carrier particles” refer to a porous substance for supporting a noble metal.
貴金属は、アンモニアを窒素酸化物と水に酸化する反応を促進する貴金属であれば限定されない。本実施形態に係るアンモニア浄化触媒において貴金属は、Ｐｔ、Ｐｄ、Ｉｒ、Ｒｕ、Ｒｈ、Ａｕ、Ａｇからなる群のうち少なくとも１つを含むことが好ましく、Ｐｔ及び／又はＰｄを含むことがより好ましく、Ｐｔを含むことがさらに好ましい。 The noble metal is not limited as long as it is a noble metal that promotes the reaction of oxidizing ammonia into nitrogen oxide and water. In the ammonia purification catalyst according to the present embodiment, the noble metal preferably contains at least one selected from the group consisting of Pt, Pd, Ir, Ru, Rh, Au and Ag, and more preferably contains Pt and / or Pd. , Pt is more preferable.
ハニカム基材の単位容積当たりに付着する貴金属の量は、例えば、Ｐｔの場合、０．０２〜２．００ｇ／Ｌであることが好ましく、０．０５〜１．００ｇ／Ｌであることがより好ましい。 In the case of Pt, for example, the amount of the noble metal attached per unit volume of the honeycomb substrate is preferably 0.02 to 2.00 g / L, and more preferably 0.05 to 1.00 g / L. preferable.
細孔及び壁面に貴金属を付着させる方法は特に限定されないが、例えば、貴金属を含む溶液にハニカム基材を含浸する方法、貴金属を含む溶液にハニカム基材の一方の端面を含浸した後、ハニカム基材の他端面から溶液を吸引する方法、貴金属を含む溶液をハニカム基材に噴霧する方法が挙げられる。 The method of attaching the noble metal to the pores and the wall surface is not particularly limited, but for example, a method of impregnating the honeycomb substrate with a solution containing the noble metal, a method of impregnating one end face of the honeycomb substrate with the solution containing the noble metal, and then the honeycomb substrate Examples include a method of sucking the solution from the other end surface of the material and a method of spraying a solution containing a noble metal on the honeycomb substrate.
［ＳＣＲ触媒層］
ＳＣＲ触媒層１２は、ＮＯxを窒素と水に分解するための層である。本実施形態のアンモニア浄化触媒は、貴金属１４を付着したハニカム基材１１におけるアンモニアの酸化反応としてＮＯxが生成する。生成したＮＯxは、ＳＣＲ触媒層１２において窒素と水に分解される。
[SCR catalyst layer]
The SCR catalyst layer 12 is a layer for decomposing NO x into nitrogen and water. In the ammonia purification catalyst of this embodiment, NO x is generated as an ammonia oxidation reaction in the honeycomb substrate 11 to which the noble metal 14 is attached. The generated NO x is decomposed into nitrogen and water in the SCR catalyst layer 12.
ＳＣＲ触媒層１２は、活性種と触媒担体粒子により構成されている。 The SCR catalyst layer 12 is composed of active species and catalyst carrier particles.
活性種はＮＯxを窒素と水に分解する反応を促進する活性種であれば特に限定されない。本実施形態に係るアンモニア浄化触媒においてＳＣＲ触媒層における活性種は、Ｃｕ、Ｆｅ、Ｃｅ、及びこれらから選択される２以上の混合物であることが好ましい。 The active species is not particularly limited as long as it is an active species that promotes the reaction of decomposing NO x into nitrogen and water. In the ammonia purification catalyst according to this embodiment, the active species in the SCR catalyst layer are preferably Cu, Fe, Ce, and a mixture of two or more selected from these.
触媒担体粒子の材質は、当業者が適宜選択することができるが、例えば、ＣＨＡ型ゼオライト，β型ゼオライト，ＭＦＩ型ゼオライトなどのゼオライト、γアルミナ、アルミナ、シリカ、メソポーラスシリカ、チタニアなどが挙げられる。 The material of the catalyst carrier particles can be appropriately selected by those skilled in the art, and examples thereof include zeolites such as CHA-type zeolite, β-type zeolite and MFI-type zeolite, γ-alumina, alumina, silica, mesoporous silica and titania. .
ＳＣＲ触媒層を塗布する方法は、用いるハニカム基材の仕様（セル壁厚、セル密度、ハニカム基材の形状、材質、サイズ等）に応じて当業者が適宜選択することができ、例えば、全面コート，ゾーンコートなどのウォッシュコート法やディッピング法が挙げられる。 The method of applying the SCR catalyst layer can be appropriately selected by those skilled in the art according to the specifications (cell wall thickness, cell density, shape, material, size, etc. of the honeycomb substrate) of the honeycomb substrate to be used. The wash coat method such as coat and zone coat and the dipping method can be mentioned.
＝＝実施例＝＝
ハニカム基材と、Ｐｔ−γアルミナを塗布した酸化触媒層と、Ｃｕ−ＣＨＡを塗布したＳＣＲ触媒層を備えるアンモニア浄化触媒（以下、「従来製法によって作製した触媒」と称する）と、細孔及び壁面にＰｔを付着したハニカム基材と、Ｃｕ−ＣＨＡを塗布したＳＣＲ触媒層を備えるアンモニア浄化触媒（以下、「直接含浸触媒」と称する）を作製した。その後、直接含浸触媒と従来製法により作製した触媒のアンモニア浄化率、アンモニアの酸化反応により生成したＮ2Ｏ濃度及びＮＯx濃度を比較した。
== Example ==
Ammonia purification catalyst (hereinafter referred to as "catalyst produced by conventional production method") including a honeycomb substrate, an oxidation catalyst layer coated with Pt-γ alumina, and an SCR catalyst layer coated with Cu-CHA, pores, and An ammonia purification catalyst (hereinafter, referred to as “direct impregnation catalyst”) including a honeycomb substrate having Pt adhered to the wall surface and an SCR catalyst layer coated with Cu—CHA was produced. Then, the ammonia purification rate of the directly impregnated catalyst and the catalyst produced by the conventional method, the N 2 O concentration produced by the oxidation reaction of ammonia, and the NO x concentration were compared.
（従来製法により作製した触媒（対照）の作製）
［１−１］酸化触媒層
エタノールアミン系のＰｔ溶液とγアルミナを混合し、Ｐｔをγアルミナに固定した。Ｐｔ−γアルミナにアルミナ系バインダーを混合し、スラリーを作製した。焼成後のＰｔ担持量が０．２ｇ／Ｌとなるよう、ウォッシュコート量３０ｇ／Ｌでスラリーをハニカム基材に塗布した。用いたハニカム基材の仕様は、表１に記載した通りである。その後、電気炉を用いて、ハニカム基材を１３０℃で５分間乾燥させ、４５０℃で２０分間焼成した。
(Preparation of catalyst prepared by conventional method (control))
[1-1] Oxidation catalyst layer An ethanolamine-based Pt solution and γ-alumina were mixed to fix Pt to γ-alumina. An alumina-based binder was mixed with Pt-γ alumina to prepare a slurry. The slurry was applied to the honeycomb substrate at a washcoat amount of 30 g / L so that the amount of Pt carried after firing was 0.2 g / L. The specifications of the honeycomb substrate used are as described in Table 1. Then, using an electric furnace, the honeycomb substrate was dried at 130 ° C. for 5 minutes and fired at 450 ° C. for 20 minutes.
［１−２］ＳＣＲ触媒層
ＣｕをＣＨＡ型ゼオライトに固定したＣｕ−ＣＨＡとアルミナ系バインダーを混合し、スラリーを作製して、ウォッシュコート量１００ｇ／Ｌでスラリーをハニカム基材に塗布した。その後、電気炉を用いて、ハニカム基材を２００℃で３０分間乾燥させ、４５０℃で３０分間焼成した。焼成後の触媒をＦｒｅｓｈ状態の触媒とする。
[1-2] SCR catalyst layer Cu-CHA in which Cu was fixed to CHA-type zeolite was mixed with an alumina binder to prepare a slurry, and the slurry was applied to a honeycomb substrate at a washcoat amount of 100 g / L. Then, using an electric furnace, the honeycomb substrate was dried at 200 ° C. for 30 minutes and fired at 450 ° C. for 30 minutes. The catalyst after calcination is used as a fresh catalyst.
［１−３］Ａｇｅｄ状態の触媒の作製
使用過程による熱劣化状態を再現した触媒を作製するために、電気炉を用いて、Ｆｒｅｓｈ状態の触媒に、６５０℃×１００Ｈｒ ｗｉｔｈ Ｈ2Ｏ＝１０％の条件で熱負荷をかけた。熱負荷後の触媒をＡｇｅｄ状態の触媒とする。
[1-3] Preparation of catalyst in aged state In order to prepare a catalyst that reproduces a state of thermal deterioration due to use, an electric furnace was used to prepare a catalyst in a fresh state at 650 ° C. × 100 hr with H 2 O = 10%. The heat load was applied under the conditions. The catalyst after the heat load is the catalyst in the Aged state.
（直接含浸触媒の作製）
［２−１］細孔及び壁面にＰｔが付着したハニカム基材
エタノールアミン系のＰｔ溶液に、ハニカム基材を１分程含浸し、焼成後のＰｔ付着量が０．２ｇ／Ｌとなるようハニカム基材にＰｔを付着させた。用いたハニカム基材の仕様は、表１に記載した通りである。その後、電気炉を用いて、ハニカム基材を１３０℃で５分間乾燥させ、４５０℃で２０分間焼成した。
(Preparation of direct impregnation catalyst)
[2-1] Honeycomb substrate with Pt adhering to pores and wall surface The ethanolamine-based Pt solution is impregnated with the honeycomb substrate for about 1 minute so that the Pt adhesion amount after firing becomes 0.2 g / L. Pt was attached to the honeycomb substrate. The specifications of the honeycomb substrate used are as described in Table 1. Then, using an electric furnace, the honeycomb substrate was dried at 130 ° C. for 5 minutes and fired at 450 ° C. for 20 minutes.
［２−２］ＳＣＲ触媒層
［１−２］と同様の手順によって、[２−１]で作製したハニカム基材に、Ｃｕ−ＣＨＡを塗布した。
[2-2] SCR catalyst layer Cu-CHA was applied to the honeycomb substrate prepared in [2-1] by the same procedure as in [1-2].
［２−３］Ａｇｅｄ状態の触媒の作製
［１−３］と同様の手順によって、Ａｇｅｄ状態の触媒を作製した。
[2-3] Preparation of catalyst in aged state A catalyst in aged state was prepared by the same procedure as in [1-3].
（触媒性能試験）
触媒評価装置を用いて、従来製法により作製した触媒と直接含浸触媒のアンモニア浄化率、アンモニアの酸化反応により生成したＮ2Ｏ濃度及びＮＯx濃度を比較した。触媒性能試験の試験条件は表２に記載した通りである。
(Catalyst performance test)
Using a catalyst evaluation device, the ammonia purification rate of the catalyst produced by the conventional method and the directly impregnated catalyst, the N 2 O concentration and the NO x concentration produced by the oxidation reaction of ammonia were compared. The test conditions for the catalyst performance test are as described in Table 2.
（試験結果）
Ｆｒｅｓｈ状態の直接含浸触媒は、従来製法により作製した触媒と比べて、約２００〜３５０℃の温度でＮ2Ｏの生成が抑制された（図２（ａ）参照）。Ａｇｅｄ状態の直接含浸触媒は、従来製法により作製した触媒と比べて、約２００〜４５０℃の温度でＮ2Ｏの生成が抑制された（図２（ｂ）参照）。
(Test results)
The fresh-impregnated catalyst in the fresh state suppressed the generation of N 2 O at a temperature of about 200 to 350 ° C., as compared with the catalyst produced by the conventional method (see FIG. 2 (a)). With the direct impregnation catalyst in the aged state, the production of N 2 O was suppressed at a temperature of about 200 to 450 ° C. as compared with the catalyst produced by the conventional production method (see FIG. 2 (b)).
Ａｇｅｄ状態の直接含浸触媒は、従来製法により作製した触媒と比べて、約２５０〜５００℃の温度でＮＯxの生成が抑制された（図３参照）。 The direct impregnation catalyst in the aged state suppressed the generation of NO x at a temperature of about 250 to 500 ° C. as compared with the catalyst produced by the conventional production method (see FIG. 3).
Ｆｒｅｓｈ状態とＡｇｅｄ状態の直接含浸触媒は共に、従来製法により作製した触媒と比べて、約１００〜２００℃の温度で高いアンモニア浄化率を示した（図４（ａ）（ｂ）参照）。 Both the fresh state and the aged state directly impregnated catalysts showed a higher ammonia purification rate at a temperature of about 100 to 200 ° C. than the catalyst produced by the conventional method (see FIGS. 4 (a) and 4 (b)).
１０ アンモニア浄化触媒
１１ ハニカム基材
１２ ＳＣＲ触媒層
１３ 細孔
１４ 貴金属
１５ 壁面
10 Ammonia Purification Catalyst 11 Honeycomb Substrate 12 SCR Catalyst Layer 13 Pore 14 Noble Metal 15 Wall Surface
Claims (4)
前記ハニカム基材に塗布したＳＣＲ触媒層と、
を備えるアンモニア浄化触媒。 A honeycomb substrate with precious metals attached to the pores and walls,
An SCR catalyst layer applied to the honeycomb substrate,
Ammonia purification catalyst equipped with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018197689A JP2020062627A (en) | 2018-10-19 | 2018-10-19 | Ammonia cleaning catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018197689A JP2020062627A (en) | 2018-10-19 | 2018-10-19 | Ammonia cleaning catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2020062627A true JP2020062627A (en) | 2020-04-23 |
Family
ID=70386510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2018197689A Pending JP2020062627A (en) | 2018-10-19 | 2018-10-19 | Ammonia cleaning catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2020062627A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021192693A1 (en) * | 2020-03-26 | 2021-09-30 | 株式会社キャタラー | Exhaust gas purification catalyst device |
| WO2023095619A1 (en) * | 2021-11-29 | 2023-06-01 | 株式会社キャタラー | Exhaust gas purification catalyst device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016193429A (en) * | 2010-05-05 | 2016-11-17 | ビーエーエスエフ コーポレーション | Integrated scr and amox catalyst systems |
| JP2017514683A (en) * | 2014-05-09 | 2017-06-08 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニーＪｏｈｎｓｏｎ Ｍａｔｔｈｅｙ Ｐｕｂｌｉｃ Ｌｉｍｉｔｅｄ Ｃｏｍｐａｎｙ | Ammonia slip catalyst with platinum impregnated on high porosity substrate |
-
2018
- 2018-10-19 JP JP2018197689A patent/JP2020062627A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016193429A (en) * | 2010-05-05 | 2016-11-17 | ビーエーエスエフ コーポレーション | Integrated scr and amox catalyst systems |
| JP2017514683A (en) * | 2014-05-09 | 2017-06-08 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニーＪｏｈｎｓｏｎ Ｍａｔｔｈｅｙ Ｐｕｂｌｉｃ Ｌｉｍｉｔｅｄ Ｃｏｍｐａｎｙ | Ammonia slip catalyst with platinum impregnated on high porosity substrate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021192693A1 (en) * | 2020-03-26 | 2021-09-30 | 株式会社キャタラー | Exhaust gas purification catalyst device |
| JP2021154207A (en) * | 2020-03-26 | 2021-10-07 | 株式会社キャタラー | Exhaust gas purification catalyst device |
| WO2023095619A1 (en) * | 2021-11-29 | 2023-06-01 | 株式会社キャタラー | Exhaust gas purification catalyst device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5208202A (en) | Exhaust gas cleaner and method of cleaning exhaust gas catalyst for cleaning exhaust gas | |
| JP5864444B2 (en) | Exhaust gas purification catalyst and exhaust gas purification catalyst structure | |
| RU2015109149A (en) | Zeolite Motivated V / Ti / W Catalysts | |
| JP5938515B2 (en) | Exhaust gas purification catalyst and exhaust gas purification method using the same | |
| JP2018523044A (en) | Catalytic soot filter for use in passive selective catalytic reduction | |
| JP6047477B2 (en) | NOx removal catalyst and method for producing the same | |
| JP2009285605A (en) | Catalyst for cleaning exhaust gas | |
| JP5876436B2 (en) | Exhaust gas purification catalyst and exhaust gas purification method | |
| JP2020062627A (en) | Ammonia cleaning catalyst | |
| JP2019060250A (en) | Oxidation catalyst device for exhaust emission control | |
| JP4989545B2 (en) | Nitrogen oxide catalytic reduction catalyst | |
| JPH11276907A (en) | Catalyst for purifying exhaust gas and its production | |
| JP2009226327A (en) | CATALYST FOR SELECTIVELY REDUCING NOx | |
| JP2009119430A (en) | Low-temperature oxidation catalyst, its production method and exhaust-gas cleaning method using the catalyst | |
| JP2006231281A (en) | Exhaust gas-treating catalyst, its manufacturing method and exhaust gas-treating method | |
| JP2006192365A (en) | Catalyst for cleaning exhaust gas from internal-combustion engine, method for manufacturing the catalyst, and exhaust gas-cleaning apparatus | |
| KR20140131402A (en) | Ammonia Oxidation Catalyst in SCR system | |
| JP2002361092A (en) | Catalyst slurry for denitrating exhaust gas, denitration catalyst and method of producing them | |
| JP3247956B2 (en) | Exhaust gas purification catalyst | |
| JPH08299809A (en) | Production of honeycomb catalyst | |
| JP6861066B2 (en) | Storage and reduction catalyst for purifying exhaust gas from a lean mixture combustion engine | |
| JP2007007606A (en) | Engine exhaust gas cleaning catalyst, catalytic reactor, and engine exhaust gas cleaning method | |
| JP4303799B2 (en) | Method for producing lean NOx purification catalyst | |
| JP2014061456A (en) | Exhaust gas-purifying filter | |
| JP2001079391A (en) | Catalyst carrier and catalyst for cleaning exhaust gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20210917 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20220620 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20220628 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20220824 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20221108 |