JP3460364B2 - Method for producing hydrocarbon adsorbent - Google Patents
Method for producing hydrocarbon adsorbentInfo
- Publication number
- JP3460364B2 JP3460364B2 JP04687195A JP4687195A JP3460364B2 JP 3460364 B2 JP3460364 B2 JP 3460364B2 JP 04687195 A JP04687195 A JP 04687195A JP 4687195 A JP4687195 A JP 4687195A JP 3460364 B2 JP3460364 B2 JP 3460364B2
- Authority
- JP
- Japan
- Prior art keywords
- zeolite
- parts
- sio
- adsorbent
- powder
- 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.)
- Expired - Fee Related
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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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、炭化水素吸着材の製造
方法に関し、特に自動車等の内燃機関から排出される排
ガス浄化用装置に使用される炭化水素吸着材の製造方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hydrocarbon adsorbent, and more particularly to a method for producing a hydrocarbon adsorbent used in a device for purifying exhaust gas discharged from an internal combustion engine such as an automobile.
【０００２】従来から、自動車等の内燃機関の排ガス浄
化用触媒としては、一酸化炭素（ＣＯ）及び炭化水素
（ＨＣ）の酸化と窒素酸化物（ＮＯｘ）の還元とを同時
に行うことのできる三元触媒が汎用されている。このよ
うな触媒は、例えば特公昭５８−２０３０７号公報にも
見られるように、耐火性担体上のアルミナコート層にパ
ラジウム、白金及びロジウム等の貴金属、及び必要に応
じて助触媒成分としてセリウムやランタン等の希土類金
属又はニッケル等のベースメタル酸化物を添加したもの
がほとんどである。Conventionally, as an exhaust gas purifying catalyst for an internal combustion engine of an automobile or the like, three catalysts capable of simultaneously oxidizing carbon monoxide (CO) and hydrocarbons (HC) and reducing nitrogen oxides (NOx) have been proposed. The original catalyst is widely used. Such a catalyst is disclosed in, for example, Japanese Patent Publication No. 58-20307, for example, a noble metal such as palladium, platinum and rhodium in an alumina coat layer on a refractory carrier, and optionally cerium or a cocatalyst component. In most cases, a rare earth metal such as lanthanum or a base metal oxide such as nickel is added.
【０００３】このような従来の触媒は、排ガス温度とエ
ンジンの設定空燃比との影響を強く受ける。自動車用触
媒が浄化能を発揮することができる排ガス温度として
は、一般に３００℃以上が必要であり、また空燃比はＨ
Ｃ及びＣＯの酸化とＮＯｘの還元とのバランスがとれる
理論空燃比付近で触媒が有効に働く。従って、従来の三
元触媒を用いる排ガス浄化装置を取り付けた自動車で
は、三元触媒が有効に働くような位置に設置されてお
り、また排気系の酸素濃度を検出して、混合気を理論空
燃比付近に保ようにフィードバック制御が行われてい
る。Such a conventional catalyst is strongly affected by the exhaust gas temperature and the set air-fuel ratio of the engine. The exhaust gas temperature at which the automobile catalyst can exert its purifying ability generally needs to be 300 ° C. or higher, and the air-fuel ratio is H.
The catalyst works effectively near the stoichiometric air-fuel ratio where the oxidation of C and CO and the reduction of NOx are balanced. Therefore, a conventional automobile equipped with an exhaust gas purification device that uses a three-way catalyst is installed at a position where the three-way catalyst works effectively, and the oxygen concentration in the exhaust system is detected to create a theoretical air-fuel mixture. Feedback control is performed so that the fuel ratio is maintained near the fuel ratio.
【０００４】しかしながら、従来の三元触媒をエキゾー
ストマニホールド直後に設置しても、排ガス温度が低い
（３００℃以下）エンジン始動直後には活性が低く、始
動直後（コールドスタート時）に排出されるＨＣは浄化
されずにそのまま排出されてしまうおそれがあった。However, even if the conventional three-way catalyst is installed immediately after the exhaust manifold, the activity is low immediately after the engine start when the exhaust gas temperature is low (300 ° C. or less), and HC is exhausted immediately after start (cold start). Could be discharged as is without being purified.
【０００５】上記の課題を解決するための排ガス浄化装
置としては、触媒コンバーターの排気上流側にコールド
ＨＣを吸着するための吸着材を納めたＨＣトラッパーを
配置したものが提案されている（特開平２−２１１２４
５号公報）。As an exhaust gas purifying apparatus for solving the above-mentioned problems, there has been proposed one in which an HC trapper containing an adsorbent for adsorbing cold HC is arranged on the exhaust gas upstream side of a catalytic converter (Japanese Patent Laid-Open No. Hei 10-1999) 2-21124
No. 5).
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
特開平２−２１１２４５号公報に開示されている吸着材
では、ゼオライト層中に小孔を形成するために発砲剤を
用いているが、この発砲剤ではハニカムコート時に目詰
まりを起こしやすく、コーティング性が悪いという欠点
があった。However, in the adsorbent disclosed in Japanese Unexamined Patent Publication (Kokai) No. Hei 2-212145, a foaming agent is used to form small pores in the zeolite layer. The agent has a drawback that it is apt to be clogged during honeycomb coating and has poor coating properties.
【０００７】従って本発明は、このような従来の問題点
に着目してなされたもので、ゼオライトスラリー中に用
いる無機バインダーとして細長い形状を有するシリカゾ
ルを用いることにより、良好なコーティング性を確保し
ながら、ゼオライト層中に小孔を作ることができ、炭化
水素のゼオライト細孔中までの拡散性が良くなり、吸着
性能を向上することができる炭化水素吸着材の製造方法
を提供することを目的とする。Therefore, the present invention has been made by paying attention to such a conventional problem, and by using silica sol having an elongated shape as an inorganic binder used in the zeolite slurry, a good coating property is ensured. , It is intended to provide a method for producing a hydrocarbon adsorbent capable of forming small pores in a zeolite layer, improving the diffusivity of hydrocarbons into zeolite pores, and improving adsorption performance. To do.
【０００８】[0008]
【課題を解決するための手段】本発明の上記の目的は、
ゼオライト粉末に、無機バインダーとして動的光散乱法
による測定粒子径（Ｄ１ｎｍ）と窒素ガス吸着法による
測定粒子径（Ｄ２ｎｍ）との比Ｄ１／Ｄ２が５以上であ
る細長い形状を有するシリカゾル及び水を加えてスラリ
ーとし、次いで該スラリーをハニカム状のモノリス担体
に塗布し、乾燥した後、焼成してコート層を形成するこ
とを特徴とする炭化水素吸着材の製造方法により達成さ
れた。The above objects of the present invention are as follows.
Zeolite powder and silica sol having an elongated shape with a ratio D1 / D2 of the particle size measured by the dynamic light scattering method (D1 nm) and the particle size measured by the nitrogen gas adsorption method (D2 nm) of 5 or more as an inorganic binder are added to zeolite powder. In addition, a method for producing a hydrocarbon adsorbent characterized in that a slurry is formed, and then the slurry is applied to a honeycomb-shaped monolith carrier, dried, and then fired to form a coat layer, is achieved.
【０００９】本発明における細長い形状のシリカゾル
は、特開平１−３１７１１５号公報に記載されており、
「動的光散乱法による測定粒子径（Ｄ１ｎｍ）と窒素ガ
ス吸着法による測定粒子径（Ｄ２ｎｍ）の比Ｄ１／Ｄ２
が５以上であって、このＤ１は４０〜５００ナノメータ
ーであり、そして電子顕微鏡観察による５〜４０ナノメ
ーターの範囲内の一様な太さで一平面内のみの伸長を有
する細長い形状の非晶質コロイダルシリカが液体溶媒中
に分散されてなるＳｉＯ2 ０．５〜３０重量％の安定な
シリカゾル」を意味し、市販されており入手することが
出来る。The elongated silica sol of the present invention is described in JP-A-1-317115.
"Ratio D1 / D2 of particle size measured by dynamic light scattering method (D1 nm) and particle size measured by nitrogen gas adsorption method (D2 nm)
Is 5 or more, the D1 is 40 to 500 nanometers, and a non-elongated shape having a uniform thickness in the range of 5 to 40 nanometers by electron microscopy and an extension only in one plane. It means "a stable silica sol of 0.5 to 30% by weight of SiO 2 in which crystalline colloidal silica is dispersed in a liquid solvent" and is commercially available.
【００１０】本発明において、シリカゾルの割合はコー
ト量中の固形分としてＳｉＯ2 が５〜３０重量％の範囲
であることが好ましい。ＳｉＯ2 が５重量％未満になる
と、コート層が剥離し易くなり、逆に３０重量％を超え
るとコート層中における吸着材の割合が減少するため、
充分な吸着性能が得られない。In the present invention, the proportion of silica sol is preferably in the range of 5 to 30% by weight of SiO 2 as a solid content in the coating amount. If the SiO 2 content is less than 5% by weight, the coating layer will be easily peeled off.
Sufficient adsorption performance cannot be obtained.
【００１１】本発明において使用されるゼオライトとし
ては、公知のゼオライトの中から適宜選択して使用する
ことができ、例えばモルデナイト、ＵＳＹ、β−ゼオラ
イト及びＺＳＭ−５から成る群から選ばれた少なくとも
１種が挙げられ、特にシリカ／アルミナのモル比が５０
〜２０００の範囲にあるゼオライトを用いることが好ま
しい。The zeolite used in the present invention can be appropriately selected from known zeolites and used, for example, at least one selected from the group consisting of mordenite, USY, β-zeolite and ZSM-5. And the silica / alumina molar ratio is 50
It is preferable to use a zeolite in the range of up to 2000.
【００１２】次に、本発明の作用を説明する。本発明の
炭化水素吸着材の製造方法によると、吸着材にコート層
内部まで炭化水素が効率良く拡散するようにゼオライト
層中に小孔が設けられる。そのために、ゼオライトスラ
リー中の無機バインダーとして細長い形状のシリカゾル
を用い、ハニカム担体に塗布している。このような細長
い形状のシリカゾルを用いることにより、ゾルの長径方
向でゼオライト同士が結合した場合に、ゼオライト粒子
間の結合距離が球状のシリカゾルを用いる場合よりも広
がり、ゾルの短径方向でゼオライト同士が結合した場合
に、ゼオライト粒子間の結合距離は短くなり種々の径の
小孔が生じてゼオライトコート層中のガスの拡散性を向
上させることができる。Next, the operation of the present invention will be described. According to the method for producing a hydrocarbon adsorbent of the present invention, the adsorbent is provided with small pores in the zeolite layer so that the hydrocarbon can be efficiently diffused into the coat layer. Therefore, a long and narrow silica sol is used as an inorganic binder in the zeolite slurry and applied to the honeycomb carrier. By using such an elongated silica sol, when the zeolites are bound to each other in the major axis direction of the sol, the bonding distance between the zeolite particles is wider than in the case of using a spherical silica sol, and the zeolites are bound to each other in the minor axis direction of the sol. When bonded with each other, the bonding distance between the zeolite particles is shortened and small holes of various diameters are generated, so that the gas diffusibility in the zeolite coat layer can be improved.
【００１３】特開平１−３１７１１５号公報には、この
ような異形のシリカゾルを用いた触媒担体成分、吸着材
成分に成形することで好ましい触媒担体や吸着材等に関
する記述があるが、上記公報では異形ゾルを用いた物を
成形する時に、成形性が向上する点にのみ着目している
が、本発明においては、成形を行わずに、ゼオライト粉
末と異形ゾルと水とでスラリー化しハニカム状のモノリ
ス担体に塗布することでゼオライト粉末間の空隙の大き
さをコントロールすることができることを新たに見い出
した。Japanese Unexamined Patent Publication (Kokai) No. 1-317115 describes a catalyst carrier, an adsorbent and the like which are preferably formed by molding into a catalyst carrier component and an adsorbent component using such a modified silica sol. When molding a product using a modified sol, attention is paid only to the point that the moldability is improved, but in the present invention, without performing molding, a zeolite powder and a modified sol and water are slurried into a honeycomb shape. It was newly found that the size of the voids between the zeolite powders can be controlled by applying it to the monolith carrier.
【００１４】また、特開平１−３１７１１５号公報に記
載されているようにシリカゾルの形状が細長い形状のた
め、ゼオライト層とハニカム担体との間の接触部分にも
平滑な面が出来にくく、逆に凹凸のある面が出来やすく
ハニカム担体とゼオライト層との間の密着性を向上させ
ることができる。Further, since the silica sol has an elongated shape as described in JP-A-1-317115, it is difficult to form a smooth surface even in the contact portion between the zeolite layer and the honeycomb carrier, and conversely. An uneven surface is easily formed, and the adhesion between the honeycomb carrier and the zeolite layer can be improved.
【００１５】[0015]
【実施例】以下、本発明を実施例によって更に詳細に説
明するが、本発明はこれによって限定されるものではな
い。また、特に断らない限り、以下に記載する部及び％
は、それぞれ重量部及び重量％を示す。EXAMPLES The present invention will now be described in more detail by way of examples, which should not be construed as limiting the invention. Unless otherwise specified, the parts and percentages described below
Indicates parts by weight and% by weight, respectively.
【００１６】実施例１
ＵＳＹ（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝５０）１００部、細長
い形状のシリカゾル（日産化学工業株式会社製の商品
名：スノーテックスＯＵＰ、比重１．０９９、ｐＨ３．
１、粘度８．４ｍＰａ．ｓ、動的光散乱法による測定粒
子径５５ｎｍ、窒素ガス吸着法による測定粒子径１２ｎ
ｍ、電子顕微鏡観察による粒子径１２ｎｍ、ＳｉＯ2 １
５．６重量％）４５部、及び水８５部を磁性ポットに投
入し、振動ミル装置で４０分間又はユニバーサルボール
ミル装置で６．５時間混合粉砕して、ウォッシュコート
スラリーを製造した。コーディエライト製品モノリス担
体を吸引コート法で吸水処理した後、前記で製造したス
ラリーを担体断面全体に均一に投入し吸引コート法で余
分なスラリーを除去した。その後、乾燥を行い４００℃
で約１時間仮焼成した。Example 1 100 parts of USY (SiO 2 / Al 2 O 3 = 50), an elongated silica sol (trade name: Snowtex OUP, manufactured by Nissan Chemical Industries, Ltd., specific gravity 1.099, pH 3.
1, viscosity 8.4 mPa.s. s, particle size 55 nm measured by dynamic light scattering method, particle size 12 n measured by nitrogen gas adsorption method
m, particle diameter 12 nm by observation with an electron microscope, SiO 2 1
45 parts by weight (5.6% by weight) and 85 parts of water were put into a magnetic pot, and mixed and ground for 40 minutes with a vibration mill device or for 6.5 hours with a universal ball mill device to produce a washcoat slurry. After the monolithic carrier of cordierite product was subjected to water absorption treatment by a suction coating method, the slurry prepared above was uniformly added to the entire cross section of the carrier and the excess slurry was removed by a suction coating method. Then, dry it at 400 ℃
It was calcined for about 1 hour.
【００１７】これによりＵＳＹゼオライトが約６０ｇ／
Ｌのコート量で担体にコートされる。上記のウォッシュ
コート、乾燥及び焼成をさらに２回繰り返して合計約１
５０ｇ／Ｌのゼオライトをコートし、空気雰囲気中で６
５０℃で４時間焼成を行い吸着材−１を得た。As a result, about 60 g of USY zeolite /
The carrier is coated with a coating amount of L. Repeat the above wash coat, drying and baking twice more to obtain a total of about 1
Coated with 50 g / L of zeolite, 6 in air atmosphere
The adsorbent-1 was obtained by firing at 50 ° C for 4 hours.
【００１８】実施例２
β−ゼオライト（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝１００）粉末
１００部、実施例１と同様のシリカゾル６５部及び水６
５部を用いた他は、実施例１と全く同様にして吸着材−
２を得た。Example 2 100 parts of β-zeolite (SiO 2 / Al 2 O 3 = 100) powder, 65 parts of silica sol similar to Example 1 and 6 parts of water
Except for using 5 parts, the adsorbent was prepared in the same manner as in Example 1.
Got 2.
【００１９】実施例３
β−ゼオライト（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝１００）粉末
１００部に代えてＺＳＭ−５（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝
７００）粉末１００部を用いた他は、実施例２と全く同
様にして吸着材−３を得た。Example 3 ZSM-5 (SiO 2 / Al 2 O 3 =) instead of 100 parts of β-zeolite (SiO 2 / Al 2 O 3 = 100) powder
700) An adsorbent-3 was obtained in the same manner as in Example 2 except that 100 parts of powder was used.
【００２０】実施例４
β−ゼオライト（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝１００）粉末
１００部に代えてモルデナイト（ＳｉＯ2 ／Ａｌ2 Ｏ3
＝２００）粉末１００部を用いた他は、実施例２と全く
同様にして吸着材−４を得た。[0020] Example 4 beta-zeolite (SiO 2 / Al 2 O 3 = 100) instead of 100 parts of powdered mordenite (SiO 2 / Al 2 O 3
= 200) Adsorbent-4 was obtained in exactly the same manner as in Example 2 except that 100 parts of powder was used.
【００２１】実施例５
β−ゼオライト（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝１００）粉末
１００部に代えてＵＳＹ（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝５
０）粉末５０部及びＺＳＭ−５（ＳｉＯ2 ／Ａｌ 2 Ｏ3
＝７００）粉末５０部を用いた他は、実施例２と全く同
様にして吸着材−５を得た。Example 5
β-zeolite (SiO2/ Al2O3= 100) powder
USY (SiO2/ Al2O3= 5
0) 50 parts powder and ZSM-5 (SiO2/ Al 2O3
= 700) The same as Example 2 except that 50 parts of powder was used.
Thus, Adsorbent-5 was obtained.
【００２２】実施例６
β−ゼオライト（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝１００）粉末
１００部に代えてＵＳＹ（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝５
０）粉末５０部及びβ−ゼオライト（ＳｉＯ2 ／Ａｌ2
Ｏ3 ＝５０）粉末５０部を用いた他は、実施例２と全く
同様にして吸着材−６を得た。Example 6 USY (SiO 2 / Al 2 O 3 = 5) was used in place of 100 parts of β-zeolite (SiO 2 / Al 2 O 3 = 100) powder.
0) 50 parts of powder and β-zeolite (SiO 2 / Al 2
O 3 = 50) Adsorbent-6 was obtained in the same manner as in Example 2 except that 50 parts of powder was used.
【００２３】実施例７
ＵＳＹ（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝５０）粉末１００部、
細長い形状のシリカゾル（日産化学工業株式会社製の商
品名：スノーテックスＵＰ、比重１．１３２、ｐＨ１
０．２、粘度１７．０ｍＰａ．ｓ、動的光散乱法による
測定粒子径５５ｎｍ、窒素ガス吸着法による測定粒子径
１２ｎｍ、電子顕微鏡観察による粒子径１２ｎｍ、Ｓｉ
Ｏ2 ２０．３重量％）３５部及び水９５部を用いた他
は、実施例１と全く同様にして吸着材−７を得た。Example 7 100 parts of USY (SiO 2 / Al 2 O 3 = 50) powder,
Elongated silica sol (trade name of Nissan Chemical Industries, Ltd .: Snowtex UP, specific gravity 1.132, pH 1
0.2, viscosity 17.0 mPa.s. s, particle diameter measured by dynamic light scattering method 55 nm, particle diameter measured by nitrogen gas adsorption method 12 nm, particle diameter 12 nm by electron microscope observation, Si
O 2 20.3% by weight) was used 35 parts and 95 parts of water to give the adsorbent -7 in the same manner as in Example 1.
【００２４】比較例１
ＵＳＹ（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝５０）粉末１００部、
酸性シリカゾル（日産化学工業株式会社製の商品名：ス
ノーテックス−Ｏ、比重１．１２８、ｐＨ２．６１、粘
度１．６ｃｐ、ＳｉＯ2 ２０．４重量％、粒径１２ｎ
ｍ）６５部及び水６５部を用いた他は、実施例１と全く
同様にして吸着材−Ｒ１を得た。Comparative Example 1 100 parts of USY (SiO 2 / Al 2 O 3 = 50) powder,
Acidic silica sol (trade name of Nissan Chemical Industries: Snowtex-O, specific gravity 1.128, pH 2.61, viscosity 1.6 cp, SiO 2 20.4% by weight, particle size 12 n
m) Adsorbent-R1 was obtained in the same manner as in Example 1 except that 65 parts of water and 65 parts of water were used.
【００２５】比較例２
ＵＳＹ（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝５０）粉末１００部に
代えてβ−ゼオライト（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝５０）
粉末１００部を用いた他は、比較例１と全く同様にして
吸着材−Ｒ２を得た。Comparative Example 2 β-zeolite (SiO 2 / Al 2 O 3 = 50) was used instead of 100 parts of USY (SiO 2 / Al 2 O 3 = 50) powder.
An adsorbent-R2 was obtained in exactly the same manner as in Comparative Example 1 except that 100 parts of the powder was used.
【００２６】比較例３
ＵＳＹ（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝５０）粉末１００部に
代えてＺＳＭ−５ゼオライト（ＳｉＯ2 ／Ａｌ2 Ｏ3 ＝
７００）粉末１００部を用いた他は、比較例１と全く同
様にして吸着材−Ｒ３を得た。[0026] Comparative Example 3 USY (SiO 2 / Al 2 O 3 = 50) ZSM-5 zeolite in place of 100 parts of the powder (SiO 2 / Al 2 O 3 =
700) Adsorbent-R3 was obtained in exactly the same manner as in Comparative Example 1 except that 100 parts of powder was used.
【００２７】実施例１〜７及び比較例１〜３で得られた
吸着材を用いて下記評価条件でＨＣ吸着性能の評価を行
った。その結果を表１に示す。Using the adsorbents obtained in Examples 1 to 7 and Comparative Examples 1 to 3, the HC adsorption performance was evaluated under the following evaluation conditions. The results are shown in Table 1.
【００２８】[0028]
【表１】 [Table 1]
【００２９】１）触媒容量 ６０ｃｃ ２）モデルガス評価 ＳＶ：４００００／ｈ ＨＣ ２０００ｐｐｍ（Ｃ7 Ｈ8 ）Ｎ2 バランス Ｈ2 Ｏ １０％添加 最初の２分間のＨＣ吸着率を評価1) Catalyst capacity 60 cc 2) Model gas evaluation SV: 40000 / h HC 2000 ppm (C 7 H 8 ) N 2 balance H 2 O 10% addition The HC adsorption rate for the first 2 minutes was evaluated.
【００３０】[0030]
【発明の効果】以上説明したきたように、本発明の炭化
水素吸着剤の製造方法によれば、ゼオライト粉末に無機
バインダー及び水を加えてスラリー化を行う時に無機バ
インダーとして細長い形状を有するシリカゾルを用いる
ことにより、ゼオライト粒子間の距離が広がり、排ガス
の拡散性が向上し、炭化水素の吸着能を効率よく行うこ
とができる。As described above, according to the method for producing a hydrocarbon adsorbent of the present invention, a silica sol having an elongated shape is used as an inorganic binder when slurry is prepared by adding an inorganic binder and water to zeolite powder. By using them, the distance between the zeolite particles is expanded, the diffusibility of the exhaust gas is improved, and the hydrocarbon adsorbing ability can be efficiently performed.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−57183（ＪＰ，Ａ) 特開 平４−284827（ＪＰ，Ａ) 特開 平４−210235（ＪＰ，Ａ) 特開 平４−65314（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B01J 20/18 B01D 53/04 F01N 3/24 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-5-57183 (JP, A) JP-A-4-284827 (JP, A) JP-A-4-210235 (JP, A) JP-A-4- 65314 (JP, A) (58) Fields surveyed (Int.Cl. 7 , DB name) B01J 20/18 B01D 53/04 F01N 3/24
Claims (3)
て動的光散乱法による測定粒子径（Ｄ１ｎｍ）と窒素ガ
ス吸着法による測定粒子径（Ｄ２ｎｍ）との比Ｄ１／Ｄ
２が５以上である細長い形状を有するシリカゾル及び水
を加えてスラリーとし、次いで該スラリーをハニカム状
のモノリス担体に塗布し、乾燥した後、焼成してコート
層を形成することを特徴とする炭化水素吸着材の製造方
法。1. The ratio D1 / D of the particle size (D1 nm) measured by the dynamic light scattering method and the particle size (D2 nm) measured by the nitrogen gas adsorption method to the zeolite powder as an inorganic binder.
Carbonization characterized by adding a silica sol having an elongated shape in which 2 is 5 or more and water to form a slurry, and then applying the slurry to a honeycomb-shaped monolith carrier, drying and firing to form a coat layer. Method for manufacturing hydrogen adsorbent.
−ゼオライト及びＺＳＭ−５から成る群から選ばれた少
なくとも１種であることを特徴とする請求項１記載の炭
化水素吸着材の製造方法。2. The zeolite is mordenite, USY, β
-The method for producing a hydrocarbon adsorbent according to claim 1, which is at least one selected from the group consisting of zeolite and ZSM-5.
００の範囲にあるゼオライトを用いることを特徴とする
請求項１又は２記載の炭化水素吸着材の製造方法。3. A silica / alumina molar ratio of 50 to 20.
The method for producing a hydrocarbon adsorbent according to claim 1 or 2, characterized in that zeolite in the range of 00 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04687195A JP3460364B2 (en) | 1995-03-07 | 1995-03-07 | Method for producing hydrocarbon adsorbent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04687195A JP3460364B2 (en) | 1995-03-07 | 1995-03-07 | Method for producing hydrocarbon adsorbent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08243382A JPH08243382A (en) | 1996-09-24 |
| JP3460364B2 true JP3460364B2 (en) | 2003-10-27 |
Family
ID=12759417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04687195A Expired - Fee Related JP3460364B2 (en) | 1995-03-07 | 1995-03-07 | Method for producing hydrocarbon adsorbent |
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| Country | Link |
|---|---|
| JP (1) | JP3460364B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3764915B2 (en) * | 1998-06-25 | 2006-04-12 | 日産自動車株式会社 | Coating hopper and catalytic converter manufacturing method |
| JP3983967B2 (en) * | 2000-09-26 | 2007-09-26 | ニチアス株式会社 | Zeolite-supported adsorbing element and method for producing the same |
| JP2006122803A (en) * | 2004-10-28 | 2006-05-18 | Daikin Ind Ltd | Functional device, functional material, and method of manufacturing functional device |
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1995
- 1995-03-07 JP JP04687195A patent/JP3460364B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08243382A (en) | 1996-09-24 |
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