JPH03154640A - Method for noble metal recovery from metal catalyst - Google Patents
Method for noble metal recovery from metal catalystInfo
- Publication number
- JPH03154640A JPH03154640A JP1292414A JP29241489A JPH03154640A JP H03154640 A JPH03154640 A JP H03154640A JP 1292414 A JP1292414 A JP 1292414A JP 29241489 A JP29241489 A JP 29241489A JP H03154640 A JPH03154640 A JP H03154640A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- nitric acid
- noble metals
- wash coat
- coat layer
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 35
- 239000003054 catalyst Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910000510 noble metal Inorganic materials 0.000 title claims abstract description 14
- 238000011084 recovery Methods 0.000 title abstract description 21
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 15
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 14
- 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 13
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 13
- 239000010948 rhodium Substances 0.000 claims abstract description 13
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 3
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 3
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000010970 precious metal Substances 0.000 claims description 31
- 150000002978 peroxides Chemical class 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 abstract description 12
- QZPSXPBJTPJTSZ-UHFFFAOYSA-N aqua regia Chemical compound Cl.O[N+]([O-])=O QZPSXPBJTPJTSZ-UHFFFAOYSA-N 0.000 abstract description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000243 solution Substances 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000011259 mixed solution Substances 0.000 abstract description 4
- 230000001376 precipitating effect Effects 0.000 abstract description 2
- 230000003197 catalytic effect Effects 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 13
- 239000007864 aqueous solution Substances 0.000 description 10
- 239000003513 alkali Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- -1 crush or crush it Substances 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
- JGUQDUKBUKFFRO-CIIODKQPSA-N dimethylglyoxime Chemical compound O/N=C(/C)\C(\C)=N\O JGUQDUKBUKFFRO-CIIODKQPSA-N 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- CCJHDZZUWZIVJF-UHFFFAOYSA-N iodo nitrate Chemical compound [O-][N+](=O)OI CCJHDZZUWZIVJF-UHFFFAOYSA-N 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000002699 waste material 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【発明の詳細な説明】 この発明はメタル触媒からの貴金属回収方法に関する。[Detailed description of the invention] This invention relates to a method for recovering precious metals from metal catalysts.
（従来の技術）
貴金属を含む触媒は、石油化学工業や自動車の排ガス浄
化などに広く利用されているが、貴金属は高価かつ有限
なので、省資源上、廃棄触媒から回収する必要がある。(Prior Art) Catalysts containing precious metals are widely used in petrochemical industries and automobile exhaust gas purification, but since precious metals are expensive and limited, they must be recovered from waste catalysts in order to conserve resources.
このため従来から排ガス浄化用触媒から貴金属を回収す
る方法が提案されている。この内メタル触媒からの貴金
属回収方法としては、例えば■メタル触媒をアルカリ水
溶液中で加熱処理し、アルミナを部分的に溶解し、貴金
属を担持したコート層を剥離させ、それを、強酸で処理
する方法（特開平１−１１１４５２号公報）、■塩酸と
過酸化水素の混合溶液（特公昭５９−３９３８号公報）
や王水を用いて、貴金属を溶解する方法がある。For this reason, methods for recovering precious metals from exhaust gas purifying catalysts have been proposed. Methods for recovering precious metals from metal catalysts include, for example: (1) heating the metal catalyst in an alkaline aqueous solution, partially dissolving the alumina, peeling off the coating layer supporting the precious metal, and treating it with a strong acid. Method (Japanese Patent Publication No. 1-111452), ■ Mixed solution of hydrochloric acid and hydrogen peroxide (Japanese Patent Publication No. 59-3938)
There is a method of dissolving precious metals using water or aqua regia.
即ち、■アルカリでアルミナを溶解して、脱アルカリ土
類金属を回収する方法、■担体も含めて溶解し、それよ
り貴金属を回収する方法で、いづれも化学的に不活性で
安定なアルミナを溶解させる事に主眼をおいた方法であ
る。Namely, there are two methods: (1) dissolving alumina with an alkali and recovering the dealkali earth metals, and (2) dissolving the alumina including the carrier and recovering the precious metals. This method focuses on dissolution.
（発明が解決しようとする課題）
しかしながら、このような従来のメタル触媒から貴金属
を回収するにあっては、■アルカリを用いてアルミナを
溶解する方法（特開平１−１１１４５２号公報）では、
剥離したコート層よりアルカリを除去する工程を必要と
する。■王水や、酢酸と過酸化水素水の混合液ではメタ
ル担体まで溶解してしまうという問題点があった。(Problem to be Solved by the Invention) However, in recovering precious metals from such conventional metal catalysts, ■method of dissolving alumina using an alkali (Japanese Patent Application Laid-open No. 1-111452),
A step is required to remove the alkali from the peeled coating layer. ■Aqua regia or a mixed solution of acetic acid and hydrogen peroxide solution had the problem that even the metal carrier was dissolved.
（課題を解決するための手段）
さて、メタル触媒、特に自動車排ガス浄化用メタル触媒
は、貴金属を触媒成分として含み、アルミナとセリアを
主成分とするウォッシュコート層をメタル担体にコート
したものである。(Means for solving the problem) Metal catalysts, especially metal catalysts for automobile exhaust gas purification, contain precious metals as catalyst components and are coated on a metal carrier with a washcoat layer mainly composed of alumina and ceria. .
使用されているセリアは、酸素（０２）ストレージ効果
、水性ガス反応等の反応に不可欠な成分である。そして
ウォッシュコート層中のセリアは触媒の使用により異な
るが、通常１５〜３０重量％含まれる。発明者らはこの
、ウォッシュコート層中のセリアに注目し、まずセリア
を溶解させ残ったウォッシュコート層のアルミナに空洞
や亀裂が形成されもろくなって担体から容易に剥離する
ので、その後は、剥離したものを出発原料として貴金属
回収を行うことにより前記の問題点が解決されることを
知見しこの発明を達成するに至った。The ceria used is an essential component for reactions such as oxygen (02) storage effect and water gas reaction. Ceria in the washcoat layer is usually contained in an amount of 15 to 30% by weight, although it varies depending on the catalyst used. The inventors focused on this ceria in the washcoat layer, and first dissolved the ceria, and the remaining alumina in the washcoat layer formed cavities and cracks, becoming brittle and easily peeled off from the carrier. The present inventors have found that the above-mentioned problems can be solved by recovering precious metals using precious metals as starting materials, and have achieved this invention.
従ってこの発明のメタル触媒からの貴金属回収方法は、
白金、パラジウムおよびロジウムからなる群から選ばれ
た少なくとも１種の貴金属を触媒成分として含み、アル
ミナとセリアを主成分としているウォッシュコート層が
塗布されたメタル触媒を硝酸水溶液中または過酸化水溶
水を加えた硝酸水溶液中で加熱して、ウォッシュコート
層をメタル担体より剥離させ、メタル担体と、分離して
貴金属を回収することを特徴とする。Therefore, the method for recovering precious metals from metal catalysts of this invention is as follows:
A metal catalyst containing at least one noble metal selected from the group consisting of platinum, palladium, and rhodium as a catalyst component and coated with a wash coat layer containing alumina and ceria as main components is placed in a nitric acid aqueous solution or a peroxide aqueous solution. The washcoat layer is peeled off from the metal carrier by heating in the added nitric acid aqueous solution, and the noble metal is recovered by separating from the metal carrier.
この発明においては、セリアを溶解する酸として、硝酸
を用いる。硝酸を用いると、セリアを溶解し且つ塩酸や
他の酸と異なり、メタル担体をほとんど溶解しない。そ
れは、硝酸水溶液に金属を投入すると表面が素早く酸化
されて安定で緻密な不動態ができ、内部への侵食が抑制
されるからである。In this invention, nitric acid is used as the acid for dissolving ceria. Nitric acid dissolves ceria and, unlike hydrochloric acid and other acids, hardly dissolves the metal carrier. This is because when a metal is placed in an aqueous nitric acid solution, the surface is quickly oxidized, forming a stable and dense passivation state, which inhibits internal corrosion.
メタル担体では、ウォッシュコート層との密着性をよく
し、耐熱性を高くするために、表面にアルミナ、シリカ
といった安定な酸化物を生成および／または固着させて
おり、硝酸による侵食が表面無処理の金属より更に抑制
される。又、硝酸によるセリアの溶解を促進させる為に
、過酸化水素水を加えてもよい。For metal carriers, stable oxides such as alumina and silica are generated and/or fixed on the surface in order to improve adhesion with the washcoat layer and increase heat resistance. metals. Further, hydrogen peroxide solution may be added to promote the dissolution of ceria by nitric acid.
この発明においては、硝酸水溶液中でメタル触媒を加熱
処理して、ウォッシュコートを剥離させた後、例えば、
王水や塩酸と過酸化水素水の混合溶液を用いて、貴金属
のみを溶解させ、これを沈殿分離して回収する方法（特
開平１−１１１４５２号公報）や、溶液抽出する方法（
特開昭６３−１４８２４号、６３−１４８２５号公報）
や、イオン交換樹脂に吸着させる方法（特開昭６３−３
０７１２３号公報）等を用いて貴金属の回収を行う。In this invention, the metal catalyst is heated in an aqueous nitric acid solution to remove the wash coat, and then, for example,
A method of dissolving only precious metals using aqua regia or a mixed solution of hydrochloric acid and hydrogen peroxide solution, and collecting this by precipitation separation (Japanese Unexamined Patent Application Publication No. 1999-111452), a method of solution extraction (
JP 63-14824, 63-14825)
or a method of adsorption to ion exchange resin (Japanese Patent Application Laid-Open No. 63-3
No. 07123), etc., to recover precious metals.
（実施例） 以下この発明を実施例および比較例により説明する。(Example) This invention will be explained below with reference to Examples and Comparative Examples.
実施例１
次の仕様のメタル触媒を、車載し、５万マイル走行後、
取り出して貴金属回収を行った。Example 1 A metal catalyst with the following specifications was installed in a vehicle, and after driving for 50,000 miles,
It was taken out and precious metals were recovered.
・触媒容積：１．３ β
・貴金属担持量： （Ｐｔ） １．１２ ｇ／ １．
（Ｒｈ）０． ｌ１ｇ／β・ウォッシュコート仕様：
（アルミナ） １５０ｇ／ Ｉｔ。・Catalyst volume: 1.3 β ・Amount of noble metal supported: (Pt) 1.12 g/1.
(Rh)0. l1g/β wash coat specifications:
(Alumina) 150g/It.
（セリア） ５０ ｇｉ ｌ
・担体： （材質） Ｆｅ−Ｃｒ−Ａｌ フェライト
ステンレス鋼、 （板厚）５０μｍ、（表面処理）酸化
処理でアルミナ層（２〜３ μｍ）を形成回収の手順は
以下の通り
■メタル触媒を３Ｎ ＨＮＯ，水溶液に浸漬して、１２
０℃で３時間加熱処理し、ウォッシュコートを剥離させ
た後、メタル担体を液より取り出した。(Ceria) 50 gil ・Support: (Material) Fe-Cr-Al ferritic stainless steel, (Thickness) 50 μm, (Surface treatment) Alumina layer (2-3 μm) is formed by oxidation treatment. The recovery procedure is as follows. ■Immerse the metal catalyst in a 3N HNO, aqueous solution for 12 hours.
After heat treatment at 0° C. for 3 hours to peel off the wash coat, the metal carrier was taken out from the liquid.
■ＨＮＯ３液にＨＣＩ水溶液を加えて王水とし、１００
℃で１０時間加熱して、貴金属を溶解させた。■Add HCI aqueous solution to HNO3 liquid to make aqua regia,
The noble metal was dissolved by heating at ℃ for 10 hours.
■王水をろ過し、ろ液に水素を吹き込み、貴金属ブラッ
クを沈殿分離した。■The aqua regia was filtered, hydrogen was blown into the filtrate, and the precious metal black was precipitated and separated.
■沈殿分離した貴金属ブラックを王水に再溶解した。■Precipitated and separated precious metal black was redissolved in aqua regia.
■亜硝酸を加えて、Ｒｈ塩を沈殿分離して回収した。(2) Nitrous acid was added to precipitate and collect the Rh salt.
■残った液を濃縮してＰｔを回収した。(2) The remaining liquid was concentrated to recover Pt.
Ｐｔの回収率は９６％、Ｒｈの回収率は８５％であった
。The recovery rate of Pt was 96% and the recovery rate of Rh was 85%.
実施例２
実施例１の回収の手順■で、３Ｎ ＨＮＤ３水溶液にか
えて３Ｎ ＨＮＯｌと３％Ｈ２Ｏ２の混合水溶液を用い
た以外は同様にして貴金属回収を行った。Ｐｔの回収率
は９７％、Ｒｈの回収率は８６％であった。Example 2 Precious metals were recovered in the same manner as in Example 1 except that a mixed aqueous solution of 3N HNOl and 3% H2O2 was used instead of the 3N HND3 aqueous solution in the recovery procedure (1). The recovery rate of Pt was 97% and the recovery rate of Rh was 86%.
実施例３
実施例１の回収の手順■でＨＮＯ３を３Ｎ ）ＩＮＯ，
から６Ｎ、 ）ＩＮＯ３にかえた以外は同様にして貴金
属回収を行った。ｐｔの回収率は９７％、Ｒｈの回収率
は８５％であった。Example 3 HNO3 was converted into 3N) INO,
Precious metals were recovered in the same manner except that INO3 was used. The recovery rate of pt was 97% and the recovery rate of Rh was 85%.
実施例４
実施例１において、触媒の貴金属を（Ｐｔ） １．１２
ｇ／β、 （Ｒｈ） ０．１１ ｇ ／Ｉ！から、（
Ｐｔ） １．４７に／β、（Ｐｄ） ０．２９ ｇ
／ １２とした。Example 4 In Example 1, the noble metal of the catalyst was (Pt) 1.12
g/β, (Rh) 0.11 g/I! from,(
Pt) 1.47/β, (Pd) 0.29 g
/ 12.
次に、貴金属回収の手順において、■の段階を、再溶解
した貴金属をジメチルグリオキシムを添加して、Ｐｄを
沈殿分離させる様に変えた以外は同様にした。Next, in the precious metal recovery procedure, the same procedure was repeated except that step (2) was changed to adding dimethylglyoxime to the redissolved precious metal and precipitating and separating Pd.
以上の操作によりＰｔ ９７％、Ｐｄ ９７％を回収し
た。Through the above operations, 97% of Pt and 97% of Pd were recovered.
実施例５
実施例１において触媒のウォッシュコート層コート仕様
を、（アルミナ） １７５ ｇ ／Ｌセリア２５ｇ／ｌ
に変えた以外は同様にして、貴金属の回収を行った。Ｐ
ｔの回収率は９７％、Ｒｈの回収率は８５％であった。Example 5 In Example 1, the catalyst washcoat layer coating specifications were changed to (alumina) 175 g/L ceria 25 g/L
Precious metals were collected in the same manner except that the method was changed to P
The recovery rate of t was 97% and the recovery rate of Rh was 85%.
実施例６
実施例２においてＨ２Ｏ２の濃度を３％から３０％に変
える以外は同様にして、貴金属の回収を行った。Ｐｔの
回収率は９８％、Ｒｈの回収率は８８％であった。Example 6 Precious metals were recovered in the same manner as in Example 2 except that the concentration of H2O2 was changed from 3% to 30%. The recovery rate of Pt was 98% and the recovery rate of Rh was 88%.
比較例
実施例１に用いた触媒を用いて、アルカリを利用した貴
金属回収を以下の手順で行った。Comparative Example Using the catalyst used in Example 1, noble metal recovery using an alkali was performed in the following procedure.
■メタル触媒を、２０％ＮａＯＨ水溶液に浸漬し、１２
０℃で３時間加熱処理を行い、ウォッシュコート層を剥
離させた後、メタル触媒を溶液より取り出した。■Immerse the metal catalyst in a 20% NaOH aqueous solution,
A heat treatment was performed at 0° C. for 3 hours to peel off the washcoat layer, and then the metal catalyst was taken out from the solution.
■剥離したウォッシュコート層を水洗し、解砕又は粉砕
し、これを直径１〜５闘に造粒し、３００〜１２ｆ）０
℃で焼成した。■ Wash the peeled wash coat layer with water, crush or crush it, and granulate it to a diameter of 1 to 5 mm.
Calcined at ℃.
■得られた粒を、王水に溶解し、これに水素ガスを吹き
込んで貴金属を沈殿分離した。(2) The obtained grains were dissolved in aqua regia, and hydrogen gas was blown into the solution to precipitate and separate the precious metals.
■沈殿分離した貴金属を王水に再溶解し、亜硝酸を加え
てＲｈ塩を沈殿分離して回収した。(2) The precipitated precious metals were redissolved in aqua regia, and nitrous acid was added to precipitate and collect the Rh salts.
■残った液をａ縮してｐｔを回収した。(2) The remaining liquid was a-condensed to collect pt.
ｐｔの回収率は７０％、Ｒｈの回収率は６６％であった
。The recovery rate of pt was 70% and the recovery rate of Rh was 66%.
以上の実施例１〜６および比較例の貴金属回収率を比較
のため天衣に示す。For comparison, the precious metal recovery rates of Examples 1 to 6 and Comparative Example are shown below.
（発明の効果）
以上説明してきたように、この発明によれば、メタル触
媒を、硝酸水溶液中で、所要に応じて過酸化水素水を加
えて、加熱処理して、ウォッシュコート層を剥離させ、
これを既知の方法で溶解して貴金属を回収するため、
■アルカリを使用しないので、脱アルカリする必要がな
く、
■メタル担体は、はとんど溶解せず、
■ウォッシュコート層のみ得られるので、担体ごと溶解
するコーディエライト担体触媒の場合よりも、貴金属の
濃度が相対的に高くなり、回収効率が良くなる。(Effects of the Invention) As described above, according to the present invention, a metal catalyst is heat-treated in a nitric acid aqueous solution with addition of hydrogen peroxide as required, and the wash coat layer is peeled off. ,
In order to recover the precious metal by dissolving it using a known method, ■ No alkali is used, so there is no need for dealkalization, ■ The metal carrier is hardly dissolved, and ■ Only the wash coat layer is obtained. , the concentration of the precious metal is relatively higher than in the case of a cordierite supported catalyst in which the entire support is dissolved, and the recovery efficiency is improved.
Claims (1)
ばれた少なくとも１種の貴金属を触媒成分として含み、
アルミナとセリアを主成分としているウォッシュコート
層が塗布されたメタル触媒を硝酸水溶液中または過酸化
水溶水を加えた硝酸水溶液中で加熱して、ウォッシュコ
ート層をメタル担体より剥離させ、メタル担体と、分離
して貴金属を回収することを特徴とするメタル触媒から
の貴金属回収方法。1. Contains at least one noble metal selected from the group consisting of platinum, palladium and rhodium as a catalyst component,
A metal catalyst coated with a washcoat layer containing alumina and ceria as main components is heated in an aqueous nitric acid solution or an aqueous nitric acid solution containing aqueous peroxide solution to separate the washcoat layer from the metal carrier. , a method for recovering precious metals from a metal catalyst, characterized by recovering precious metals by separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1292414A JPH03154640A (en) | 1989-11-13 | 1989-11-13 | Method for noble metal recovery from metal catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1292414A JPH03154640A (en) | 1989-11-13 | 1989-11-13 | Method for noble metal recovery from metal catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03154640A true JPH03154640A (en) | 1991-07-02 |
Family
ID=17781478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1292414A Pending JPH03154640A (en) | 1989-11-13 | 1989-11-13 | Method for noble metal recovery from metal catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03154640A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7410930B2 (en) | 2003-03-10 | 2008-08-12 | Matsushita Electric Industrial Co., Ltd. | Recovering catalyst and carrier by exfoliating overcoat layer on the surface of a catalyst layer |
| CN102390875A (en) * | 2011-08-06 | 2012-03-28 | 河南兴发精细化工有限公司 | Method for preparing palladium chloride solution in process of producing sodium gluconate by using multielement metal catalytic oxidation method |
| WO2014038048A1 (en) * | 2012-09-06 | 2014-03-13 | 株式会社キャタラー | Method for recovering precious metal from metal carrier catalyst |
-
1989
- 1989-11-13 JP JP1292414A patent/JPH03154640A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7410930B2 (en) | 2003-03-10 | 2008-08-12 | Matsushita Electric Industrial Co., Ltd. | Recovering catalyst and carrier by exfoliating overcoat layer on the surface of a catalyst layer |
| CN102390875A (en) * | 2011-08-06 | 2012-03-28 | 河南兴发精细化工有限公司 | Method for preparing palladium chloride solution in process of producing sodium gluconate by using multielement metal catalytic oxidation method |
| WO2014038048A1 (en) * | 2012-09-06 | 2014-03-13 | 株式会社キャタラー | Method for recovering precious metal from metal carrier catalyst |
| JP5889417B2 (en) * | 2012-09-06 | 2016-03-22 | 株式会社キャタラー | Method for recovering noble metals from metal-supported catalysts |
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