JP2012125675A - Method of preparing supported palladium catalyst and decomposition method of organic halogen compound using the catalyst - Google Patents
Method of preparing supported palladium catalyst and decomposition method of organic halogen compound using the catalyst Download PDFInfo
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本発明は、担持パラジウム触媒を調製する方法、及び該方法により得られた触媒を用いた有機ハロゲン化合物の分解方法に関する。 The present invention relates to a method for preparing a supported palladium catalyst, and a method for decomposing an organic halogen compound using the catalyst obtained by the method.
担体にパラジウム又はその酸化物が担持されてなる、いわゆる担持パラジウム触媒は、オレフィンや芳香族炭化水素の水素化、有機ハロゲン化合物の水素化脱ハロゲン等の様々な化学反応に対して高活性な触媒であり、化学工業で広範に使用されている。
工業的に用いられる担持パラジウム触媒の調製法には、パラジウム（II）化合物を担体に担持し、水素化ホウ素ナトリウム等の強い水素供与性をもつ試薬、あるいは水素ガスで還元処理して活性化する方法が、一般的に採用されている。この還元処理で、触媒表面に金属パラジウムが生成し、触媒活性が発現する。パラジウム（II）化合物と担体の組み合わせ、あるいは還元処理の方法・条件によって、調製した触媒の活性は大きく異なることが知られている。
A so-called supported palladium catalyst in which palladium or an oxide thereof is supported on a carrier is a highly active catalyst for various chemical reactions such as hydrogenation of olefins and aromatic hydrocarbons, hydrodehalogenation of organic halogen compounds, etc. And widely used in the chemical industry.
To prepare a supported palladium catalyst for industrial use, a palladium (II) compound is supported on a support and activated by reduction treatment with a hydrogen-donating reagent such as sodium borohydride or hydrogen gas. The method is generally adopted. By this reduction treatment, metallic palladium is generated on the catalyst surface and the catalytic activity is exhibited. It is known that the activity of the prepared catalyst varies greatly depending on the combination of the palladium (II) compound and the support or the method and conditions of the reduction treatment.
本発明者等は、先に担持パラジウム触媒を用いて、有機ハロゲン化合物を２−プロパノール・メタノール混合液とアルカリ化合物の存在下に反応させることにより、脱ハロゲン・無害化する方法を提案した。（特許文献１参照）
この方法は、クロロベンゼン、ポリ塩化ビニル（ＰＣＢ）などのように人体に対する毒性が高いことで知られている有機ハロゲン化合物を、安価な２−プロパノ−ルとメタノ−ルを溶媒として用いて、常圧、８３℃以下という温和な条件で脱ハロゲン化して無害化することができるため、省エネルギ−並びにランニングコストの低減を達成することができるものである。
しかしながら、触媒に用いるパラジウムは希少で高価な金属であるので、パラジウムの使用量をさらに低減し、かつ高活性な担持パラジウム触媒を提供する新規触媒調製法の開発が求められていた。
The present inventors previously proposed a method for dehalogenation and detoxification by reacting an organic halogen compound with a 2-propanol / methanol mixed solution and an alkali compound using a supported palladium catalyst. (See Patent Document 1)
In this method, an organic halogen compound known to be highly toxic to the human body, such as chlorobenzene and polyvinyl chloride (PCB), is usually used using inexpensive 2-propanol and methanol as solvents. Since it can be dehalogenated and detoxified under a mild condition of a pressure of 83 ° C. or lower, energy saving and a reduction in running cost can be achieved.
However, since palladium used as a catalyst is a rare and expensive metal, development of a novel catalyst preparation method that further reduces the amount of palladium used and provides a highly active supported palladium catalyst has been demanded.
本発明は、上記従来技術の問題点を解消し、パラジウムの使用量を低減し、かつ有機ハロゲン化合物の脱ハロゲン反応等の触媒反応に対して高活性な担持パラジウム触媒を調製する方法を提供することを目的とする。 The present invention provides a method for solving the problems of the prior art described above, reducing the amount of palladium used, and preparing a supported palladium catalyst that is highly active for catalytic reactions such as dehalogenation reactions of organic halogen compounds. For the purpose.
本発明者等は鋭意研究した結果、従来法とは異なる担持パラジウム触媒の調製方法を見いだし、この知見に基づき本発明をなすに至った。
すなわち本発明は、次の方法を採用するものである。
［１］パラジウム（II）化合物を担体に担持させた後、アルカリ化合物を溶解した２−プロパノール溶液で処理して活性化させることを特徴とする担持パラジウム触媒の調製方法。
［２］前記触媒が、有機ハロゲン化合物の分解反応のための触媒であることを特徴とする上記［１］の担持パラジウム触媒の調製方法。
［３］有機ハロゲン化合物を脱ハロゲン・無害化する分解方法において、上記［１］の方法で調製された触媒を用いることを特徴とする有機ハロゲン化合物の分解方法。
［４］２−プロパノ−ル・メタノ−ル混合液と、アルカリ化合物の存在下で行うことを特徴とする上記［３］の有機ハロゲン化合物の分解方法。
As a result of intensive studies, the present inventors have found a method for preparing a supported palladium catalyst that is different from the conventional method, and based on this finding, have come to the present invention.
That is, the present invention employs the following method.
[1] A method for preparing a supported palladium catalyst, comprising supporting a palladium (II) compound on a carrier and then activating it by treating with a 2-propanol solution in which an alkali compound is dissolved.
[2] The method for preparing a supported palladium catalyst according to the above [1], wherein the catalyst is a catalyst for a decomposition reaction of an organic halogen compound.
[3] A decomposition method for decomposing and detoxifying an organic halogen compound, wherein the catalyst prepared by the method of [1] is used.
[4] The method for decomposing an organic halogen compound according to the above [3], which is carried out in the presence of a mixture of 2-propanol and methanol and an alkali compound.
本発明によれば、低いパラジウム担持量で、かつ高活性な担持パラジウム触媒を調製できる。そのため、高価で希少なパラジウムの使用量が少なくて済み、触媒の製造コストを低減できるほか、希少なパラジウム資源の保全・有効利用を図ることができる。 According to the present invention, a supported palladium catalyst having a low palladium loading and a high activity can be prepared. Therefore, the amount of expensive and rare palladium used can be reduced, the production cost of the catalyst can be reduced, and the preservation and effective utilization of the rare palladium resource can be achieved.
本発明を詳細に説明する。
本発明の担持パラジウム触媒の調製方法は、パラジウム（II）化合物を担体に担持させた後、アルカリ化合物を溶解した２−プロパノール溶液で処理して活性化させることを特徴とする。
以下、本発明について詳細に説明する。
The present invention will be described in detail.
The method for preparing a supported palladium catalyst according to the present invention is characterized in that a palladium (II) compound is supported on a support and then activated by treatment with a 2-propanol solution in which an alkali compound is dissolved.
Hereinafter, the present invention will be described in detail.
最初に、パラジウム（II）化合物を担体に担持させる方法について記載する。
手順は以下のとおりである。
パラジウム（II）化合物を溶媒に溶解させ、この溶液に担体を加え、充分に浸漬させたのち、加熱して蒸発乾固させる。
用いる担体としては特に限定されないが、表面積が大きく、かつ溶媒により変質等が生じにくい無機酸化物の粉末が好ましい。具体的には、例えば、シリカゲル、アルミナ、酸化チタン等の金属酸化物や活性炭を用いることができ、なかでも、特にシリカゲルが好適である。
First, a method for supporting a palladium (II) compound on a carrier will be described.
The procedure is as follows.
The palladium (II) compound is dissolved in a solvent, a carrier is added to this solution, and after sufficient immersion, it is heated and evaporated to dryness.
The carrier to be used is not particularly limited, but an inorganic oxide powder having a large surface area and hardly causing alteration or the like by a solvent is preferable. Specifically, for example, metal oxides such as silica gel, alumina and titanium oxide, and activated carbon can be used, and silica gel is particularly preferable.
パラジウム（II）化合物にも特に制限はないが、例えば、塩化パラジウム（II）、酢酸パラジウム（II）、硝酸パラジウム（II）、硝酸テトラアンミンパラジウム（II）、およびビス（アセチルアセトナト）パラジウム（II）等を挙げることができ、中でも、硝酸テトラアンミンパラジウム（II）[Pd(NH3)4(NO3)2]が好適である。
パラジウム（II）化合物の担持量には特に制限はないが、パラジウム金属にして０.１〜５重量％が好ましく、さらには０.５〜２重量％が好適である。
The palladium (II) compound is not particularly limited, and examples thereof include palladium chloride (II), palladium acetate (II), palladium nitrate (II), tetraammine palladium nitrate (II), and bis (acetylacetonato) palladium (II). Among them, tetraamminepalladium nitrate (II) [Pd (NH 3 ) 4 (NO 3 ) 2 ] is preferable.
The amount of the palladium (II) compound supported is not particularly limited, but is preferably 0.1 to 5% by weight, more preferably 0.5 to 2% by weight in terms of palladium metal.
パラジウム（II）化合物を溶解させる溶媒としては、パラジウム（II）化合物を溶解するものであれば特に制限はないが、水または揮発性有機溶媒が好適である。例えば、水；メタノール、エタノール、１−プロパノール、２−プロパノール等のアルコール類；ヘキサン、ベンゼン、トルエン、キシレン等の炭化水素類；ジクロロメタン、クロロホルム、四塩化炭素等のハロゲン化炭化水素類；アセトン、メチルエチルケトン、メチルイソブチルケトン等のケトン類；ジメチルホルムアミド、ジメチルアセトアミド等のアミド類；等が挙げられる。溶媒は１種を用いることも、２種以上の混合物を使用することもできる。 The solvent for dissolving the palladium (II) compound is not particularly limited as long as it dissolves the palladium (II) compound, but water or a volatile organic solvent is preferable. For example, water; alcohols such as methanol, ethanol, 1-propanol and 2-propanol; hydrocarbons such as hexane, benzene, toluene and xylene; halogenated hydrocarbons such as dichloromethane, chloroform and carbon tetrachloride; acetone; Ketones such as methyl ethyl ketone and methyl isobutyl ketone; amides such as dimethylformamide and dimethylacetamide; One type of solvent can be used, or a mixture of two or more types can be used.
次に、活性化処理について記載する。
以下の手順で活性化処理を行う。
パラジウム（II）化合物を担持した上記試料を、アルカリ化合物を溶解した２−プロパノール溶液に加えて沸点（８３℃）まで加熱し、沸騰・還流させる。沸騰・還流の時間は１０〜３０分が好適である。
用いるアルカリ化合物には、水酸化ナトリウム、水酸化カリウム、または水酸化リチウムが好適である。
２−プロパノール溶液中のアルカリ化合物の濃度は０.０５〜０.１mol／Lが好適であり、溶液の液量は、担持されているパラジウム（II）化合物のモル数に対して、アルカリ化合物のモル数が大過剰、好ましくは５０〜５００倍量になるようにする。
担体として、白色系の担体を用いることで、この活性化処理により、担体の色が褐色に変化するのが確認できる。これは、担体上のパラジウム種の電子状態が変化したためであり、金属パラジウムが生成しているものと考えられる。
Next, the activation process will be described.
The activation process is performed according to the following procedure.
The sample carrying the palladium (II) compound is added to the 2-propanol solution in which the alkali compound is dissolved, heated to the boiling point (83 ° C.), and boiled / refluxed. The boiling / refluxing time is preferably 10 to 30 minutes.
As the alkali compound to be used, sodium hydroxide, potassium hydroxide, or lithium hydroxide is suitable.
The concentration of the alkali compound in the 2-propanol solution is preferably from 0.05 to 0.1 mol / L, and the amount of the solution is such that the amount of the alkali compound relative to the number of moles of the supported palladium (II) compound. The number of moles is set to a large excess, preferably 50 to 500 times.
By using a white carrier as the carrier, it can be confirmed that the color of the carrier changes to brown by this activation treatment. This is because the electronic state of the palladium species on the carrier has changed, and it is considered that metallic palladium is generated.
以上のように調製された担持パラジウム触媒は、溶液から分離され、各種の触媒反応に供される。
以下、触媒反応の１つである、有機ハロゲン化物の分解反応について説明する。
有機ハロゲン化合物の分解反応は、有機ハロゲン化合物を脱ハロゲン化して無害化する方法である。
無害化処理しうる化合物は、置換基としてハロゲン原子を少なくとも１つ有する有機化合物であり、芳香族炭化水素でも脂肪族炭化水素でもよい。また、ハロゲン原子以外の置換基を有していてもよい。炭素数１〜２０程度の炭化水素が好ましく、炭素数１〜１２がさらに好ましい。このようなものとして具体的には、例えば、クロロベンゼン、ＰＣＢ、塩素化ダイオキシン、トリクロロエチレンなどがあげられる。
The supported palladium catalyst prepared as described above is separated from the solution and subjected to various catalytic reactions.
Hereinafter, an organic halide decomposition reaction, which is one of the catalytic reactions, will be described.
The decomposition reaction of an organic halogen compound is a method for detoxifying an organic halogen compound by dehalogenation.
The compound that can be detoxified is an organic compound having at least one halogen atom as a substituent, and may be an aromatic hydrocarbon or an aliphatic hydrocarbon. Moreover, you may have substituents other than a halogen atom. A hydrocarbon having 1 to 20 carbon atoms is preferable, and 1 to 12 carbon atoms is more preferable. Specific examples of such a material include chlorobenzene, PCB, chlorinated dioxin, and trichloroethylene.
以下、２−プロパノール・メタノール混合液を用いた有機ハロゲン化合物の分解方法について詳細に説明する。
アルカリ化合物を溶解した２−プロパノ−ル・メタノ−ル混合液に、有機ハロゲン化合物と、前述の活性化処理した触媒を添加した後、例えばスタ−ラ−と攪拌子を使用して、攪拌しながら反応を行う。反応温度は室温近傍でよいが、必要に応じて反応溶液は２−プロパノ−ルの沸点（８３℃）以下に加熱される。
２−プロパノ−ル・メタノ−ル混合液は、全容積を１００としたとき、メタノ−ルの混合割合が容積で０.１〜５０、特に０.１〜２５であるものが好ましい。反応溶液中の有機ハロゲン化合物濃度は特に制限はないが、通常５％重量以下であり、好ましくは０.１〜１重量％である。アルカリの添加量は、有機ハロゲン化合物中のハロゲン原子とのモル比で１.０以上であればよいが、２〜１０程度が好適である。アルカリ化合物は反応開始前に全量を反応溶液に溶解させておくことが望ましいが、常にアルカリ化合物が飽和濃度に近い状態になるように適宜添加してもよく、あるいは完全に溶解しない場合には固体のまま添加してもよい。
触媒の添加量は特に制限はないが、１〜５０ｇ／Ｌが好適である。
Hereinafter, the decomposition method of the organic halogen compound using a 2-propanol / methanol mixed solution will be described in detail.
After adding the organic halogen compound and the aforementioned activated catalyst to the 2-propanol / methanol mixed solution in which the alkali compound is dissolved, the mixture is stirred using, for example, a stirrer and a stirrer. While doing the reaction. Although the reaction temperature may be around room temperature, the reaction solution is heated to the boiling point (83 ° C.) or lower of 2-propanol as necessary.
The 2-propanol / methanol mixed solution is preferably such that when the total volume is 100, the mixing ratio of methanol is 0.1 to 50, particularly 0.1 to 25 in volume. The concentration of the organic halogen compound in the reaction solution is not particularly limited, but is usually 5% by weight or less, preferably 0.1 to 1% by weight. The addition amount of the alkali may be 1.0 or more in terms of a molar ratio with the halogen atom in the organic halogen compound, but about 2 to 10 is preferable. It is desirable to dissolve the entire amount of the alkali compound in the reaction solution before the start of the reaction. It may be added as it is.
The addition amount of the catalyst is not particularly limited, but 1 to 50 g / L is preferable.
アルカリ化合物としては、水酸化リチウム、水酸化ナトリウム、水酸化カリウム等を使
用することができるが、特に安価でアルコ−ルに対して溶解度が高い水酸化ナトリウム又は水酸化カリウムが好ましい。反応温度は２−プロパノ−ルの沸点である８３℃を越えることはないが、室温（２５℃程度）でも十分に反応が進行する。反応雰囲気には特に制限はないが、反応温度が高い場合には、安全性を考慮して窒素等の不活性ガス雰囲気下で行うことが望ましい。また、この分解反応は常圧で行うことができる。
As the alkali compound, lithium hydroxide, sodium hydroxide, potassium hydroxide, or the like can be used, and sodium hydroxide or potassium hydroxide that is particularly inexpensive and highly soluble in alcohol is preferable. The reaction temperature does not exceed 83 ° C. which is the boiling point of 2-propanol, but the reaction proceeds sufficiently even at room temperature (about 25 ° C.). The reaction atmosphere is not particularly limited, but when the reaction temperature is high, it is desirable to carry out in an inert gas atmosphere such as nitrogen in consideration of safety. In addition, this decomposition reaction can be carried out at normal pressure.
一般に、反応時間は、有機ハロゲン化合物濃度、触媒量、反応温度に依存するが、これらの反応条件が同じ場合、本発明では、２−プロパノ−ル・メタノ−ル混合溶媒を用いることにより、２−プロパノ−ルまたはメタノ−ルを単独で溶媒として用いる従来法より、反応時間を大幅に短縮することができる。 In general, the reaction time depends on the concentration of the organic halogen compound, the amount of catalyst, and the reaction temperature. When these reaction conditions are the same, in the present invention, by using a 2-propanol / methanol mixed solvent, 2 -The reaction time can be greatly shortened compared with the conventional method using propanol or methanol alone as a solvent.
以下、本発明を実施例に基づいて説明するが、本発明はこの実施例に限定されるものではない。
（実施例１）
ビーカー内で、硝酸テトラアンミンパラジウム（II）[Pd(NH3)4(NO3)2]０.１０ｇを蒸留水２０ｍLに溶解させた。この水溶液に、シリカゲル粉体３.３ｇを加え、室温で２０時間浸漬させたのち、１００℃に制御した恒温乾燥機内で７時間加熱し、蒸発乾固させて、硝酸テトラアンミンパラジウム（II）が担持された淡黄色の粉体試料を得た。
次に、上部に冷却管が付いた試験管に、水酸化ナトリウムを溶解した２−プロパノール溶液（０.０６mol／L）５ｍLを採り、上記粉体試料１０ｍｇを加えた。粉体試料を含む溶液は、スターラーと恒温水槽を用いて攪拌しながら加熱され、２−プロパノールの沸点（８３℃）で１０分間、沸騰・還流させて活性化した。このとき、粉体試料の色は、淡黄色から褐色に変化した。室温で静置したのち、デカンテーションで溶液を取り除き、担持パラジウム触媒を得た。パラジウム担持量は、１重量％であった。
EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to this Example.
Example 1
In a beaker, 0.10 g of tetraamminepalladium (II) nitrate [Pd (NH 3 ) 4 (NO 3 ) 2 ] was dissolved in 20 mL of distilled water. After adding 3.3 g of silica gel powder to this aqueous solution and immersing it at room temperature for 20 hours, it was heated in a constant temperature dryer controlled at 100 ° C. for 7 hours and evaporated to dryness to carry tetraamminepalladium nitrate (II). A pale yellow powder sample was obtained.
Next, 5 mL of 2-propanol solution (0.06 mol / L) in which sodium hydroxide was dissolved was taken in a test tube with a cooling tube on the top, and 10 mg of the powder sample was added. The solution containing the powder sample was heated with stirring using a stirrer and a constant temperature water bath, and activated by boiling and refluxing at the boiling point of 2-propanol (83 ° C.) for 10 minutes. At this time, the color of the powder sample changed from pale yellow to brown. After standing at room temperature, the solution was removed by decantation to obtain a supported palladium catalyst. The amount of palladium supported was 1% by weight.
以上のように調製した担持パラジウム触媒を用いて、特許文献１の方法に従い、パラ−クロロメトキシベンゼンの脱塩素反応を行った。その手順は以下のとおりであった。
上記担持パラジウム触媒１０ｍｇに、２−プロパノール・メタノール混合液（容積比９９：１）５ｍL、水酸化ナトリウム１２ｍｇ、パラ−クロロメトキシベンゼン８ｍｇからなる反応溶液を加えた。反応溶液はスターラーを用いて攪拌し、反応温度は恒温水槽を用いて３０℃に保持した。
ガスクロマトグラフ−質量分析計で反応を追跡したところ、反応時間が１０分でパラ−クロロメトキシベンゼンの反応率が１００％に達した。脱塩素生成物としては、メトキシベンゼンのみが検出された。
Using the supported palladium catalyst prepared as described above, the dechlorination reaction of para-chloromethoxybenzene was performed according to the method of Patent Document 1. The procedure was as follows.
To 10 mg of the supported palladium catalyst, a reaction solution consisting of 5 mL of a 2-propanol / methanol mixture (volume ratio 99: 1), 12 mg of sodium hydroxide, and 8 mg of para-chloromethoxybenzene was added. The reaction solution was stirred using a stirrer, and the reaction temperature was maintained at 30 ° C. using a constant temperature water bath.
When the reaction was monitored with a gas chromatograph-mass spectrometer, the reaction rate of para-chloromethoxybenzene reached 100% in 10 minutes. Only methoxybenzene was detected as the dechlorination product.
（比較例１）
硝酸テトラアンミンパラジウム（II）をシリカゲルに担持した粉体試料（実施例１と同一）を、従来法で活性化して担持パラジウム触媒を調製した。従来法による活性化は、水素ガス気流中で３００℃で１時間、還元処理する方法を採用した。得られた担持パラジウム触媒は濃褐色であり、パラジウム担持量は実施例１と同じで１重量％であった。
以上のように調製した担持パラジウム触媒を用いて、パラ−クロロメトキシベンゼンの脱塩素反応を、実施例１と同じ反応条件で行った。ガスクロマトグラフ−質量分析計で反応を追跡した結果、反応時間１０分後のパラ−クロロメトキシベンゼン反応率は１２％であった。脱塩素生成物としては、メトキシベンゼンのみが検出された。
(Comparative Example 1)
A powder sample (same as Example 1) carrying tetraamminepalladium nitrate (II) on silica gel was activated by a conventional method to prepare a supported palladium catalyst. For the activation by the conventional method, a reduction treatment at 300 ° C. for 1 hour in a hydrogen gas stream was adopted. The obtained supported palladium catalyst was dark brown, and the amount of palladium supported was the same as in Example 1 and was 1% by weight.
Using the supported palladium catalyst prepared as described above, the dechlorination reaction of para-chloromethoxybenzene was carried out under the same reaction conditions as in Example 1. As a result of monitoring the reaction with a gas chromatograph-mass spectrometer, the reaction rate of para-chloromethoxybenzene after 10 minutes of the reaction time was 12%. Only methoxybenzene was detected as the dechlorination product.
実施例１と比較例１の比較から、本発明によるアルカリ化合物を溶解した２−プロパノール溶液で処理して活性化する触媒調製法を用いると、従来法による水素ガスで還元処理して活性化する触媒調製法に比べ、非常に高活性な担持パラジウム触媒を調製できることがわかった。 From the comparison between Example 1 and Comparative Example 1, when using the catalyst preparation method that is activated by treatment with a 2-propanol solution in which an alkali compound is dissolved according to the present invention, it is activated by reduction treatment with hydrogen gas according to the conventional method. It was found that a supported palladium catalyst having a very high activity can be prepared as compared with the catalyst preparation method.
（比較例２）
特許文献１の実施例１を、ここに比較例とした。
すなわち、活性炭上にパラジウムを担持させた触媒（Pd/C,パラジウム担持量：５重量％）を用いて、本発明の実施例１と同じ反応条件で、パラ−クロロメトキシベンゼンの脱塩素反応を行った。ガスクロマトグラフ−質量分析計で反応を追跡したところ、パラ−クロロメトキシベンゼンの反応率が１００％に達するのに、２０分の反応時間を要した。脱塩素生成物としては、メトキシベンゼンのみが検出された。
(Comparative Example 2)
Example 1 of Patent Document 1 was used as a comparative example.
That is, dechlorination reaction of para-chloromethoxybenzene was carried out under the same reaction conditions as in Example 1 of the present invention using a catalyst in which palladium was supported on activated carbon (Pd / C, palladium supported amount: 5% by weight). went. When the reaction was traced with a gas chromatograph-mass spectrometer, it took 20 minutes for the reaction rate of para-chloromethoxybenzene to reach 100%. Only methoxybenzene was detected as the dechlorination product.
実施例１と比較例２の比較から、本発明による担持パラジウム触媒の調製法を用いると、特許文献で報告されている担持パラジウム触媒（Pd/C）より、低いパラジウム担持量で、かつ高活性な担持パラジウム触媒を調製できることがわかった。 From the comparison between Example 1 and Comparative Example 2, when the method for preparing a supported palladium catalyst according to the present invention is used, the supported palladium catalyst (Pd / C) reported in the patent literature has a lower palladium loading and higher activity. It was found that a supported palladium catalyst could be prepared.
パラジウムは触媒として産業界で広く用いられているが、高価で希少な金属であるため、その使用量の削減が求められている。本発明方法によれば、低いパラジウム担持量で、かつ高活性な担持パラジウム触媒を調製できるので、パラジウムの使用量を大幅に削減することができる。 Palladium is widely used as a catalyst in the industrial world, but since it is an expensive and rare metal, it is required to reduce its use amount. According to the method of the present invention, since a supported palladium catalyst having a low palladium loading and a high activity can be prepared, the amount of palladium used can be greatly reduced.
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