JPS63175640A - Catalyst carrier - Google Patents
Catalyst carrierInfo
- Publication number
- JPS63175640A JPS63175640A JP62008679A JP867987A JPS63175640A JP S63175640 A JPS63175640 A JP S63175640A JP 62008679 A JP62008679 A JP 62008679A JP 867987 A JP867987 A JP 867987A JP S63175640 A JPS63175640 A JP S63175640A
- Authority
- JP
- Japan
- Prior art keywords
- neodymium
- alumina
- barium
- catalyst
- carrier
- 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 50
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 30
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052788 barium Inorganic materials 0.000 claims abstract description 26
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000007864 aqueous solution Substances 0.000 abstract description 10
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 abstract description 6
- CFYGEIAZMVFFDE-UHFFFAOYSA-N neodymium(3+);trinitrate Chemical compound [Nd+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O CFYGEIAZMVFFDE-UHFFFAOYSA-N 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 2
- ATINCSYRHURBSP-UHFFFAOYSA-K neodymium(iii) chloride Chemical compound Cl[Nd](Cl)Cl ATINCSYRHURBSP-UHFFFAOYSA-K 0.000 abstract description 2
- 239000008188 pellet Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 238000000746 purification Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 4
- 239000010948 rhodium Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005470 impregnation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052703 rhodium Inorganic materials 0.000 description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 3
- 238000003809 water extraction Methods 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- 229910000420 cerium oxide Inorganic materials 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000004438 BET method Methods 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 238000010669 acid-base reaction Methods 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- 150000001553 barium compounds Chemical class 0.000 description 1
- QKYBEKAEVQPNIN-UHFFFAOYSA-N barium(2+);oxido(oxo)alumane Chemical compound [Ba+2].[O-][Al]=O.[O-][Al]=O QKYBEKAEVQPNIN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002798 neodymium compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、アルミナを主成分とする触媒担体であり、自
動車排気浄化用触媒あるいは燃焼触媒等に使用する担体
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a catalyst carrier containing alumina as a main component, which is used as an automobile exhaust purification catalyst or a combustion catalyst.
従来、触媒担体に使われているアルミナは、１０００℃
以上の高温下ではα−アルミナに変態し。Conventionally, alumina used as a catalyst carrier is heated to 1000°C.
At higher temperatures, it transforms into α-alumina.
しかも表面積は１０ｒｒｒ／ｇ以下に低下してしまい。Moreover, the surface area decreases to less than 10 rrr/g.
担持した触媒成分の活性を充分に引き出すことができな
い。The activity of the supported catalyst component cannot be fully brought out.
従来、このアルミナにおける表面積の低下防止。Traditionally, this prevents surface area reduction in alumina.
α−アルミナへの変態防止などの熱的安定性を向上させ
る方法として、アルカリ土類金属であるバリウムを添加
すること（第５６回触媒討論会予稿集４Ｎ１７，１９２
（１９８５）、特開昭５０−９０５９０号）、あるい
は酸化ランタン（ｔ、ａｘＯｌ）を添加すること（特開
昭４８−１４６００号）が提案されている。また、触媒
成分の助触媒としてバリウム（Ｂａ）、 ランタン（Ｌ
ａ）またはセリウム（Ｃｅ）等のランタニドの塩を担持
した酸化触媒（特開昭５６−２６５４８号）も提案され
ている。Addition of barium, an alkaline earth metal, is a method for improving thermal stability such as preventing transformation to α-alumina (Proceedings of the 56th Catalyst Symposium 4N17, 192
(1985), JP-A-50-90590), or addition of lanthanum oxide (t, axOl) (JP-A-48-14600). In addition, barium (Ba) and lanthanum (L) are used as promoters of catalyst components.
An oxidation catalyst supporting a salt of a) or a lanthanide such as cerium (Ce) has also been proposed (Japanese Patent Application Laid-Open No. 56-26548).
しかしながら、上記提案においても、１０００℃以上の
高温下における表面積の低下が大きく。However, even in the above proposal, the surface area decreases significantly at high temperatures of 1000° C. or higher.
更に貴金属等からなる触媒成分の分散性が悪く。Furthermore, the dispersibility of catalyst components made of noble metals etc. is poor.
耐熱性触媒担体として十分に実用化されるものは得られ
ていない。A material that can be put into practical use as a heat-resistant catalyst carrier has not yet been obtained.
そこで２本発明者らは、上記の問題を解決すべく、アル
ミナにネオジムとバリウムとを添加してなる触媒担体を
考え、しかも更に性能に優れたものを開発すべく鋭意検
討した結果１本発明を成すに至ったものである。Therefore, in order to solve the above problems, the inventors of the present invention considered a catalyst carrier made by adding neodymium and barium to alumina, and as a result of intensive study to develop one with even better performance, the present inventors have invented the present invention. This is what we have come to realize.
本発明は、１０００℃以上の高温下においても十分な表
面積を有し、しかも触媒成分の高い分散性を有する耐熱
性に優れた。アルミナを主成分とする触媒担体を提供し
ようとするものである。The present invention has a sufficient surface area even at high temperatures of 1000° C. or higher, and has excellent heat resistance with high dispersibility of catalyst components. The present invention aims to provide a catalyst carrier containing alumina as a main component.
本発明は、アルミナに、該アルミナに対して０゜１〜３
モル％のネオジムと該ネオジムに対して０゜０１〜４０
モル倍のバリウムと示添加されてなることを特徴とする
触媒担体である。The present invention provides alumina with a temperature of 0°1 to 3° relative to the alumina.
Mol% of neodymium and 0°01-40 for the neodymium
This catalyst carrier is characterized in that barium is added in twice the molar amount.
本発明において、アルミナ（Ａｌｚｏｚ）は、触媒担体
の主成分をなすものである。該アルミナの形態としては
、ガンマ（γ）、デルタ（δ）、イータ（η）、カイ
（χ）、シータ（θ）、カッパ（に）等、いかなるもの
でもよいが、その中でもγ−アルミナが最も望ましい。In the present invention, alumina (Alzoz) is a main component of the catalyst carrier. The forms of the alumina include gamma (γ), delta (δ), eta (η), chi
(χ), theta (θ), kappa (ni), or any other alumina may be used, but among these, γ-alumina is the most desirable.
ネオジム及びバリウムは、上記アルミナに添加されてな
るものである。この２成分のアルミナ中での存在形態と
しては、アルミナ中に固溶した状態が望ましい。Neodymium and barium are added to the alumina. The state in which these two components exist in alumina is preferably a solid solution in alumina.
ネオジムの添加量は、アルミナに対して０．１〜３モル
％の範囲内とする。該添加量が０．１モル％未満では、
アルミナがα−アルミナへ転移しやす（１表面積の低下
が大きい。また添加量が３モル％を越える場合には、ア
ルミナとネオジムとが反応してネオジムアルミネー）
（ＮｄＡ１０３ ）が生成し９表面積を低下させる原因
となる。The amount of neodymium added is within the range of 0.1 to 3 mol% relative to alumina. If the amount added is less than 0.1 mol%,
Alumina easily transforms into α-alumina (1 surface area decreases significantly. Also, if the amount added exceeds 3 mol%, alumina and neodymium react and form neodymium alumina).
(NdA103) is generated and causes a decrease in surface area.
また、バリウムの添加量は、上記ネオジムに対して０．
０１〜４０モル倍とする。なお９例えば。Moreover, the amount of barium added is 0.
01 to 40 times the mole. For example, 9.
バリウム添加量がネオジムに対して０．０１モル倍とは
、ネオジム１モルに対してバリウムを０．０１モル添加
することを示す。該添加量が０．０１モル倍未満では、
貴金属成分を担持する時に起きる酸・塩基反応に寄与す
る担体表面の塩基性が弱（なり、触媒成分の分散性が悪
くなる。また添加量が４０モル倍を越える場合には、ア
ルミナとバリウムとが反応してアルミン酸バリウム（Ｂ
ａｃｌＡｌｚｏｘ）が生成し１表面積を低下させる原因
となり、しかも担体表面の塩基性が強すぎて触媒成分の
分散性が低下する。When the amount of barium added is 0.01 mole times that of neodymium, it means that 0.01 mole of barium is added to 1 mole of neodymium. If the amount added is less than 0.01 mole,
The basicity of the carrier surface, which contributes to the acid-base reaction that occurs when supporting noble metal components, becomes weak (and the dispersibility of the catalyst component becomes poor.Also, if the amount added exceeds 40 moles, the alumina and barium reacts to form barium aluminate (B
aclAlzox) is produced, causing a decrease in surface area, and the basicity of the surface of the carrier is too strong, resulting in a decrease in the dispersibility of catalyst components.
本発明の触媒担体の製造方法としては、アルミナとネオ
ジムとバリウムとの粉末を混合して高温で焼成する方法
、あるいは含浸法を利用する方法等がある。この含浸法
を利用する方法としては。Methods for producing the catalyst carrier of the present invention include a method of mixing powders of alumina, neodymium, and barium and firing the mixture at a high temperature, or a method of using an impregnation method. How to use this impregnation method.
例えば、塩化ネオジム、硝酸ネオジム、塩化バリウム、
硝酸バリウム等のネオジム、バリウムの水溶性化合物を
溶解させた水溶液を用い、該水溶液をアルミナに含浸さ
せた後、該アルミナを乾燥させ、然る後焼成するもので
ある。なお、ネオジムまたはバリウムの一方の元素を添
加させた後、他方の元素を添加させてもよく、あるいは
水溶性ネオジム化合物と水溶性バリウム化合物の混合物
を溶解した水溶液を用いて双方の元素を同時に添加させ
てもよい、また上記製造方法の中でも、含浸法を利用す
る方法は、アルミナ中へのネオジムとバリウムとの添加
が均一となり、更にアルミナへのネオジムとバリウムと
の固溶が促進されやす（。For example, neodymium chloride, neodymium nitrate, barium chloride,
Using an aqueous solution in which a water-soluble compound of neodymium or barium such as barium nitrate is dissolved, alumina is impregnated with the aqueous solution, the alumina is dried, and then fired. Note that after adding one element, neodymium or barium, the other element may be added, or both elements may be added simultaneously using an aqueous solution containing a mixture of a water-soluble neodymium compound and a water-soluble barium compound. Also, among the above manufacturing methods, the method using the impregnation method makes it possible to uniformly add neodymium and barium into alumina, and further promotes the solid solution of neodymium and barium into alumina ( .
望ましい。desirable.
本発明において、対象とする担体の形状、構造は１粒状
体、ペレット状体あるいはハニカム構造体等がある。ま
た母材としてのセラミックス多孔質体等からなる成形体
の表面に本発明にかかるアルミナにネオジムとバリウム
とが添加されてなるものを被覆して担体としてもよい。In the present invention, the shape and structure of the target carrier include a single particle, a pellet, a honeycomb structure, and the like. Alternatively, the surface of a molded body made of a ceramic porous body or the like as a base material may be coated with the alumina according to the present invention to which neodymium and barium are added to form a carrier.
本発明の担体は、自動車排気浄化用触媒、燃焼触媒等の
担体として使用することができ、特に耐熱性に優れるの
で、高温燃焼用触媒のように１０００℃以上の高温下に
おいて使用される触媒の担体として有利である。The carrier of the present invention can be used as a carrier for automobile exhaust purification catalysts, combustion catalysts, etc., and has particularly excellent heat resistance, so it can be used as a carrier for catalysts used at high temperatures of 1000°C or higher, such as high-temperature combustion catalysts. It is advantageous as a carrier.
本発明の触媒担体は、１０００℃以上の高温下において
使用しても高い比表面積を維持し、かつ触媒成分の分散
性に優れたものである。上記の高い比表面積を維持する
のは、添加したネオジムとバリウムの作用によるもので
あり、触媒成分の分散性が向上するのは、担体表面の酸
・塩基性が最適な状態にあることによるものと考えられ
る。The catalyst carrier of the present invention maintains a high specific surface area even when used at high temperatures of 1000° C. or higher, and has excellent dispersibility of catalyst components. Maintaining the high specific surface area mentioned above is due to the action of the added neodymium and barium, and the improvement in the dispersibility of the catalyst components is due to the optimal acidity and basicity of the support surface. it is conceivable that.
以下９本発明の詳細な説明する。 Hereinafter, nine aspects of the present invention will be described in detail.
硝酸ネオジムの水溶液を表面積が１６０耐／ｇであるＴ
−アルミナに１表に示すネオジム添加量となるような割
合において、含浸させた。その後。An aqueous solution of neodymium nitrate with a surface area of 160 resistance/g
- Alumina was impregnated with neodymium in the proportions shown in Table 1. after that.
上記γ−アルミナを乾燥させ、水分を取り除いた後、６
００℃、大気中、３時間にて焼成し、γ−アルミナにネ
オジムを添加した。After drying the above γ-alumina and removing moisture,
It was fired at 00° C. in the air for 3 hours, and neodymium was added to the γ-alumina.
次に、硝酸バリウムの水溶液を用い２表に示すバリウム
添加量となるような割合にて、上記と同様にしてバリウ
ムを添加した。これにより、ネオジムとバリウムとが添
加されてなるＴ−アルミナを８用型した。更に該Ｔ−ア
ルミナを１０００℃。Next, using an aqueous solution of barium nitrate, barium was added in the same manner as above at a ratio such that the amount of barium added was as shown in Table 2. As a result, T-alumina to which neodymium and barium were added was made into an 8-size mold. Furthermore, the T-alumina was heated to 1000°C.
空気中、３時間にて焼成して触媒担体を調製した。A catalyst carrier was prepared by firing in air for 3 hours.
なお表中で、ネオジム添加量は、アルミナに対する添加
割合であり、バリウム添加量はネオジムに対する添加１
１（Ｂａ／Ｎｄ；モル倍）により示しである。In the table, the amount of neodymium added is the addition ratio to alumina, and the amount of barium added is the addition ratio of 1 to neodymium.
1 (Ba/Nd; molar times).
また、比較のため、ネオジムとバリウムの添加量が本発
明の範囲外のものも同様に調製した。For comparison, samples containing neodymium and barium in amounts outside the range of the present invention were also prepared in the same manner.
次に、触媒担体として重要な因子である水抽出ｐＨ，比
表面積及び触媒成分の分散性について測定した。Next, water extraction pH, specific surface area, and dispersibility of catalyst components, which are important factors for a catalyst carrier, were measured.
（試験例１：水抽出ｐＨ）
蒸留水２０Ｍ１に触媒担体８−を入れ、スタークにより
３０分間攪拌した後、室温下においてｐＨメータにより
ｐ Ｈを測定した。その結果を表に示す。(Test Example 1: Water Extraction pH) Catalyst carrier 8- was placed in 20M1 of distilled water, stirred for 30 minutes using a Stark stirrer, and then the pH was measured using a pH meter at room temperature. The results are shown in the table.
（試験例２：比表面積）
触媒担体を１２００℃、５時間焼成した後、ＢＥＴ法（
Ｎ、吸着法）により比表面積を測定した。(Test Example 2: Specific Surface Area) After baking the catalyst carrier at 1200°C for 5 hours, the BET method (
The specific surface area was measured by N, adsorption method).
その結果を表に示す。表より明らかなように９本実施例
の触媒担体は、比較例のものに比べて高温下における比
表面積の低下が小さいことが分かる。The results are shown in the table. As is clear from the table, the catalyst carrier of Example 9 shows a smaller decrease in specific surface area at high temperatures than that of the comparative example.
（試験例３：触媒活性）
触媒活性は、自動車用三元触媒に使用されている酸化セ
リウムと白金とロジウムを担持し、酸素（０□）２％の
自動車排気中、１２００℃で１０時間耐久試験を行った
後、理論混合比の自動車排気を模擬したモデルガスによ
り炭化水素（ＨＣ）。(Test Example 3: Catalyst Activity) Catalytic activity was determined by supporting cerium oxide, platinum, and rhodium, which are used in automotive three-way catalysts, and durability at 1200°C for 10 hours in 2% oxygen (0□) automotive exhaust. After conducting the test, a model gas simulating automobile exhaust at a stoichiometric ratio was used to test hydrocarbons (HC).
−酸化炭素（Ｃｏ）、窒素酸化物（ＮＯｘ）の浄化率を
測定した。- The purification rate of carbon oxide (Co) and nitrogen oxides (NOx) was measured.
セリウムの担持量が０．３モル／ｌとなるように調製し
た硝酸セリウムの水溶液に触媒担体を含浸し、１１０℃
で１２ｈｒ乾燥後、空気中、６００℃で３時間焼成し酸
化セリウムを担持した。The catalyst carrier was impregnated with an aqueous solution of cerium nitrate prepared so that the amount of cerium supported was 0.3 mol/l, and
After drying for 12 hours, it was fired in air at 600° C. for 3 hours to support cerium oxide.
白金とロジウムの担持は以下のように行っ′た。Platinum and rhodium were supported as follows.
まず酸化セリウムを担持した触媒担体に所定濃度のジニ
トロジアミン白金（Ｐ ｔ （ＮＨ３） ｔ （Ｎ
Ｏｘ）ｚ）の硝酸酸性水溶液を含浸させ、該触媒担体を
乾燥させた後、６００℃、空気中、３時間にて焼成して
白金を１ ｇ／ｌ担持した。次に上記触媒担体に硝酸ロ
ジウム（Ｒｈ （ＮＯ３） ３ ）の硝酸酸性水溶液を
含浸させ、該触媒担体を乾燥した後、６００℃、空気中
、３時間にて焼成してロジウムを０．１ｇ／ｌ担持した
。First, a predetermined concentration of dinitrodiamine platinum (P t (NH3) t (N
The catalyst carrier was impregnated with a nitric acidic aqueous solution of Ox)z), dried, and then calcined in air at 600°C for 3 hours to support 1 g/l of platinum. Next, the catalyst carrier was impregnated with a nitric acidic aqueous solution of rhodium nitrate (Rh (NO3) 3 ), dried, and then calcined at 600° C. in air for 3 hours to absorb 0.1 g of rhodium/ l carried.
上記触媒を容器に入れ１２００℃になるように電気炉に
より加熱した。その容器に理論混合比のエンジン排気に
空気を添加し酸素濃度を２％に調製したガスを空間速度
（ＳＶ） ２０００／ｈ ｒで流入させ１０時間保ち、
触媒を劣化させた。The above catalyst was placed in a container and heated to 1200° C. in an electric furnace. A gas prepared by adding air to the engine exhaust at a stoichiometric mixing ratio and adjusting the oxygen concentration to 2% was introduced into the container at a space velocity (SV) of 2000/hr, and kept there for 10 hours.
Degraded the catalyst.
次に、上記耐久触媒を実験室用反応器に設置し。Next, the durable catalyst was placed in a laboratory reactor.
０．７％Ｃｏ、０．２３３％Ｈ，，０，６４６％０□。0.7%Co, 0.233%H, 0,646%0□.
１６００ｐｐｍ （ＴＨＣ（炭素数１−のＣＨ，に換算
した場合の濃度） ） Ｃ３Ｈ＆−１２００ｐ ｐｍＮ
Ｏｘ、１０％ＣＯｚ、１０％Ｈ２０，残部Ｎ！の理論混
合比の排気を模擬したガスをＳＶ３万／ｈｒで導入し１
反応器の触媒を５℃／分で昇温しながら自動車用排気分
析計により各ガス濃度を測定した。その際、ＮＯｘが５
０％浄化される時の触媒層の温度を図に示した。なお３
図の横軸はネオジムに対するバリウムのＩ（Ｂａ／Ｎｄ
）、また縦軸は表の試料１ｋＣ３のＮＯｘの５０％浄化
温度を０とした場合のＮＯｘの５０％浄化温度の低下温
度量（℃）（触媒活性）を示しである。1600ppm (Concentration when converted to THC (CH with 1-carbon number)) C3H&-1200p pmN
Ox, 10% COz, 10% H20, balance N! A gas simulating exhaust gas with a theoretical mixture ratio of was introduced at a SV of 30,000/hr.
The concentration of each gas was measured using an automobile exhaust analyzer while heating the catalyst in the reactor at a rate of 5° C./min. At that time, NOx was 5
The temperature of the catalyst layer when 0% purification is achieved is shown in the figure. Note 3
The horizontal axis of the figure is the I (Ba/Nd) of barium relative to neodymium.
), and the vertical axis shows the amount of temperature decrease (° C.) (catalytic activity) in the NOx 50% purification temperature when the NOx 50% purification temperature of sample 1kC3 in the table is set to 0.
図より明らかなように、Ｂａ／Ｎｄが本発明の範囲内で
あれば、触媒活性が高いことが分かる。As is clear from the figure, it can be seen that the catalyst activity is high when Ba/Nd is within the range of the present invention.
これは表の水抽出ｐＨに示すように担体表面の塩基度が
最適な状態にあるために触媒成分の担持が最適になされ
たことと、担体が熱的に安定であり比表面積が大きいた
めとの相乗効果と考えられる。This is because the basicity of the surface of the carrier is in an optimal state as shown in the water extraction pH in the table, so that the catalyst components are supported optimally, and the carrier is thermally stable and has a large specific surface area. This is considered to be a synergistic effect.
図は実施例における触媒活性試験の結果を示す線図であ
る。The figure is a diagram showing the results of catalyst activity tests in Examples.
Claims (1)
オジムと該ネオジムに対して０．０１〜４０モル倍のバ
リウムとが添加されてなることを特徴とする触媒担体。A catalyst carrier characterized in that neodymium is added to alumina in an amount of 0.1 to 3 mol% relative to the alumina, and barium is added in an amount of 0.01 to 40 times the amount by mol relative to the neodymium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62008679A JPS63175640A (en) | 1987-01-16 | 1987-01-16 | Catalyst carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62008679A JPS63175640A (en) | 1987-01-16 | 1987-01-16 | Catalyst carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63175640A true JPS63175640A (en) | 1988-07-20 |
Family
ID=11699615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62008679A Pending JPS63175640A (en) | 1987-01-16 | 1987-01-16 | Catalyst carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63175640A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS644250A (en) * | 1987-03-05 | 1989-01-09 | Toyota Central Res & Dev | Catalyst for cleaning exhaust gas and its production |
| JP2009178675A (en) * | 2008-01-31 | 2009-08-13 | Toyota Central R&D Labs Inc | Catalyst for cleaning exhaust gas |
| DE102009000208A1 (en) * | 2009-01-14 | 2010-07-15 | Robert Bosch Gmbh | Structural element, preferably particle filter, particle sensor or waste gas catalyst for reducing penetration of ash melting during thermal loading of component, comprises coating contactable with burn exhaust gases |
| JP4734417B2 (en) * | 2006-09-13 | 2011-07-27 | 株式会社東芝 | Paper sheet processing apparatus, paper sheet taking out apparatus, and paper sheet taking out method |
| US10906816B2 (en) | 2016-07-29 | 2021-02-02 | Sumitomo Chemical Company, Limited | Alumina and method for producing automotive catalyst using same |
-
1987
- 1987-01-16 JP JP62008679A patent/JPS63175640A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS644250A (en) * | 1987-03-05 | 1989-01-09 | Toyota Central Res & Dev | Catalyst for cleaning exhaust gas and its production |
| JP4734417B2 (en) * | 2006-09-13 | 2011-07-27 | 株式会社東芝 | Paper sheet processing apparatus, paper sheet taking out apparatus, and paper sheet taking out method |
| US8152157B2 (en) | 2006-09-13 | 2012-04-10 | Kabushiki Kaisha Toshiba | Sheet processing apparatus, sheet take-out apparatus, and sheet take-out method thereof |
| JP2009178675A (en) * | 2008-01-31 | 2009-08-13 | Toyota Central R&D Labs Inc | Catalyst for cleaning exhaust gas |
| DE102009000208A1 (en) * | 2009-01-14 | 2010-07-15 | Robert Bosch Gmbh | Structural element, preferably particle filter, particle sensor or waste gas catalyst for reducing penetration of ash melting during thermal loading of component, comprises coating contactable with burn exhaust gases |
| US10906816B2 (en) | 2016-07-29 | 2021-02-02 | Sumitomo Chemical Company, Limited | Alumina and method for producing automotive catalyst using same |
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