JP2006076836A - Novel aluminum silicate and method for synthesizing the same - Google Patents

Novel aluminum silicate and method for synthesizing the same Download PDF

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JP2006076836A
JP2006076836A JP2004263269A JP2004263269A JP2006076836A JP 2006076836 A JP2006076836 A JP 2006076836A JP 2004263269 A JP2004263269 A JP 2004263269A JP 2004263269 A JP2004263269 A JP 2004263269A JP 2006076836 A JP2006076836 A JP 2006076836A
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aluminum silicate
aluminum
solution
silicate
humidity
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JP4631022B2 (en
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Masaya Suzuki
正哉 鈴木
Chieko Ikeda
智英子 池田
Hisayo Sato
久代 佐藤
Makiko Suzuki
麻起子 鈴木
Keiichi Inukai
恵一 犬飼
Masaki Maeda
雅喜 前田
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National Institute of Advanced Industrial Science and Technology AIST
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Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a novel excellent aluminum silicate which can quickly adsorb and desorb various substances over a wide humidity range. <P>SOLUTION: The aluminum silicate has the composition expressed in terms of a molar ratio among oxides: SiO<SB>2</SB>xAl<SB>2</SB>O<SB>3</SB>yH<SB>2</SB>O (wherein x=0.5 to 2.0; and y=0 to 15) and gives a powder X-ray diffraction spectrum having relatively large broad peaks at Bragg angles (2θ±0.5°) of 3.5°, 8.5°, 26°, and 40°. This silicate is a novel porous material having numerous micropores, and by virtue of its excellent properties such as adsorptivity, it can be used in material recovery and storage, dehumidification, moisture removal, detoxification, combustibles storage and deodorization, etc., and especially as a humidity self-conditioning material which maintains humidity in a living environment at an optimal level. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、吸着能に優れたアルミニウムケイ酸塩及びその合成法に関するものである。より詳しくは、本発明は、高い表面活性による吸着能、水との親和性、イオン交換能に優れ、高比表面積と多量の微細孔及びその形態を利用して、熱交換材、天然ガス等の貯蔵、湿度を自律的に制御する湿度調節剤、デシカント剤、香料等の吸着媒体や化粧品、有害汚染物質の吸・脱臭剤または速乾性乾燥剤等に応用可能なチューブ状アルミニウムケイ酸塩、その合成法及びその塩を用いる吸着剤に関するものである。   The present invention relates to an aluminum silicate excellent in adsorption capacity and a synthesis method thereof. More specifically, the present invention is superior in adsorption ability due to high surface activity, affinity with water, ion exchange ability, utilizing a high specific surface area, a large amount of fine pores and their forms, heat exchange materials, natural gas, etc. Tube-shaped aluminum silicate that can be applied to storage media, humidity control agents that autonomously control humidity, desiccants, fragrances and other adsorbents and cosmetics, harmful pollutants, quick-drying agents, etc. The present invention relates to an adsorbent using the synthesis method and a salt thereof.

非晶質あるいは低結晶性のアルミニウムケイ酸塩は、天然においてアロフェンまたはイモゴライトとして産出するものである。天然のアロフェンは火山灰土壌からなる多くの地域において産出されるが、天然のイモゴライトを産出する土壌の地域は限られているばかりでなく、産出量も極めて少ない。そのうえ、天然アロフェンや天然イモゴライトは、表面に酸化鉄の皮膜が形成されているため、脱鉄処理を施しても鉄を含まない純物質を得ることが難しい。このような背景から、特定の無機物質溶液を用いて高純度のアロフェンやイモゴライトを合成する方法が検討され、すでに提案されている(例えば、参考文献1〜3参照)。   Amorphous or low crystalline aluminum silicates are naturally produced as allophane or imogolite. Natural allophane is produced in many areas composed of volcanic ash soil, but not only is the area of soil producing natural imogolite limited, but also the production is extremely small. Moreover, since natural allophane and natural imogolite have an iron oxide film formed on the surface, it is difficult to obtain a pure substance that does not contain iron even if the iron is removed. From such a background, a method of synthesizing high-purity allophane or imogolite using a specific inorganic substance solution has been studied and has been proposed (for example, see References 1 to 3).

現在、上記の合成法は確立されているものの、高比表面積を有するアロフェンやイモゴライトを得るには、無機ケイ素化合物溶液と無機アルミニウム化合物溶液を混合して調整した溶液中から、それらの生成阻害要因となる共存イオンを取り除いた後、100℃前後で加熱処理を行う必要があるという問題があった。   Although the above synthesis method is currently established, in order to obtain allophane and imogolite having a high specific surface area, the formation inhibition factors from the solution prepared by mixing the inorganic silicon compound solution and the inorganic aluminum compound solution are mixed. After removing the coexisting ions, the heat treatment needs to be performed at around 100 ° C.

また従来の加熱合成により得られたアロフェンやイモゴライトは、その水蒸気吸着特性において、相対湿度が30%から80%の中湿度領域において吸着量の差異が約10%程度に過ぎず吸着量が非常に小さいという問題があった。   In addition, allophane and imogolite obtained by conventional heat synthesis have an adsorption amount of only about 10% in the middle humidity range of 30% to 80% relative humidity in the water vapor adsorption characteristic, and the adsorption amount is very high. There was a problem of being small.

特開平10−236818号公報Japanese Patent Laid-Open No. 10-236818 特開2001−64010号公報JP 2001-64010 A 特開2001−220129号公報Japanese Patent Laid-Open No. 2001-220129

本発明は、従来の技術における上記した課題を解決するためになされたものである。すなわち、本発明の目的は、広範な湿度領域において多様な物質を迅速に吸着及び脱着できる優れたアルミニウムケイ酸塩を提供すること、及びその塩をテンプレート剤を使用することなく、低温で、かつ低コストで合成する方法を提供することにある。また、本発明の他の目的は、高い表面活性により吸着能や水との親和性あるいはイオン交換能に優れており、かつ高比表面積と多量の微細孔を有するアルミニウムケイ酸塩からなる吸着剤を提供することにある。   The present invention has been made to solve the above-described problems in the prior art. That is, an object of the present invention is to provide an excellent aluminum silicate capable of rapidly adsorbing and desorbing various substances in a wide humidity range, and to use the salt at a low temperature without using a template agent. The object is to provide a method of synthesis at low cost. Another object of the present invention is an adsorbent comprising an aluminum silicate having high surface activity and excellent adsorption capacity, affinity with water or ion exchange capacity, and having a high specific surface area and a large number of fine pores. Is to provide.

本発明者らは、良好な吸着能を有するアルミニウムケイ酸塩を低コストで合成する方法の開発に向けて鋭意研究を重ねた結果、合成により得られたアルミニウムケイ酸塩の前駆体溶液を特定の条件下で処理することにより、微細孔を有する良好な吸着能を持つアルミニウムケイ酸塩が得られることを見出し、本発明を完成するに至った。   As a result of intensive research aimed at developing a method for synthesizing aluminum silicate having good adsorption ability at a low cost, the inventors have identified an aluminum silicate precursor solution obtained by synthesis. It has been found that an aluminum silicate having fine pores and good adsorption ability can be obtained by treating under the above conditions, and the present invention has been completed.

すなわち、本発明のアルミニウムケイ酸塩は、酸化物のモル比で次の組成:SiO・xAl・yHO(式中、x=0.5〜2.0、y=0〜15)からなり、かつ粉末X線回折スペクトルにおいて、ブラッグ角(2θ±0.5°)3.5°、8.5°、26°及び40°に比較的大きいブロードなピークを有することを特徴とするものである。
また、上記したアルミニウムケイ酸塩は、粉末X線回折スペクトルにおいて、さらにブラッグ角(2θ±0.5°)16.5°、33.5°、44.5°、54°及び66°に小さいブロードなピークを有するものであることが好ましい。
That is, the aluminum silicate of the present invention has the following composition in terms of the molar ratio of oxides: SiO 2 · xAl 2 O 3 · yH 2 O (wherein x = 0.5 to 2.0, y = 0 to 0). 15) and having a relatively large broad peak at a Bragg angle (2θ ± 0.5 °) of 3.5 °, 8.5 °, 26 ° and 40 ° in a powder X-ray diffraction spectrum It is what.
Further, the above-described aluminum silicate is further reduced to a Bragg angle (2θ ± 0.5 °) of 16.5 °, 33.5 °, 44.5 °, 54 ° and 66 ° in the powder X-ray diffraction spectrum. It is preferable that it has a broad peak.

また、本発明のアルミニウムケイ酸塩の合成法は、無機ケイ素化合物溶液と無機アルミニウム化合物溶液を混合してアルミニウムケイ酸塩を形成させ、これを脱塩処理して得られるアルミニウムケイ酸塩の分散溶液をエージングさせた後、100℃以下の温度で乾燥させることを特徴とするものである。
さらに、本発明の吸着剤は、酸化物のモル比で次の組成:SiO・xAl・yHO(式中、x=0.5〜2.0、y=0〜15)からなり、かつ粉末X線回折スペクトルにおいて、ブラッグ角(2θ±0.5°)3.5°、8.5°、26°及び40°に比較的大きいブロードなピークを有するものである。
Also, the method of synthesizing the aluminum silicate of the present invention is a dispersion of aluminum silicate obtained by mixing an inorganic silicon compound solution and an inorganic aluminum compound solution to form an aluminum silicate and desalting it. After the solution is aged, it is dried at a temperature of 100 ° C. or lower.
Furthermore, the adsorbent of the present invention has the following composition in terms of the molar ratio of oxide: SiO 2 .xAl 2 O 3 .yH 2 O (wherein x = 0.5 to 2.0, y = 0 to 15). And having a relatively large broad peak at a Bragg angle (2θ ± 0.5 °) of 3.5 °, 8.5 °, 26 ° and 40 ° in a powder X-ray diffraction spectrum.

本発明のアルミニウムケイ酸塩は、ナノメーター径の多量の微細孔を有する多孔質無機物質からなるものであって、水分子、低分子量の無機物質及び有機物質などを、多量に素早く吸着及び脱着する吸着剤として使用できることから、湿度調節などの水分の調整、有害物質の除去、吸着される物質の貯蔵および乾燥剤などとして有用であり、特に相対湿度30〜80%の中湿度領域における吸着剤として有益なものである。
また、本発明の製法によれば、上記した優れた吸着特性等を有するアルミニウムケイ酸塩を安価に合成することができる。
The aluminum silicate of the present invention is composed of a porous inorganic substance having a large amount of fine pores with a nanometer diameter, and quickly adsorbs and desorbs water molecules, low molecular weight inorganic substances and organic substances in large quantities. Since it can be used as an adsorbent, it is useful for adjusting moisture such as humidity control, removing harmful substances, storing adsorbed substances, and desiccants. As useful as.
Further, according to the production method of the present invention, the above-described aluminum silicate having excellent adsorption characteristics and the like can be synthesized at low cost.

以下、本発明について詳細に説明する。
本発明のアルミニウムケイ酸塩は、新たな合成法により得られ、水分子などの出入りできる多量の微細孔を有するチューブ状多孔体であるうえに、表面活性が高く、表面積が大きいことなどから良好な吸着能及び脱着能を有し、また水との親和性及びイオン交換能に優れていることから、生活環境の湿度を自律的に制御する湿度調節材、天然ガスの貯蔵、有害汚染物質の吸着材、脱臭材及び速乾性乾燥剤等などの多様な分野に応用可能なものである。
Hereinafter, the present invention will be described in detail.
The aluminum silicate of the present invention is obtained by a new synthesis method and is good because it is a tubular porous body having a large amount of fine pores capable of entering and exiting water molecules and the like, and has a high surface activity and a large surface area. It has a high adsorption capacity and desorption capacity, and is excellent in affinity with water and ion exchange capacity, so it can control humidity in the living environment autonomously, storage of natural gas, harmful pollutants It can be applied to various fields such as adsorbents, deodorizing materials and quick-drying desiccants.

本発明のアルミニウムケイ酸塩の合成原料としては、無機ケイ素化合物と無機アルミニウム化合物が用いられる。ケイ素源として使用される試剤は、モノケイ酸化合物であればよく、具体的にはオルトケイ酸ナトリウム、メタケイ酸ナトリウム、無定形コロイド状二酸化ケイ素(エアロジルなど)などが好適なものとして挙げられる。一方、上記ケイ酸塩分子と結合させるアルミニウム源としては、アルミニウムイオンであればよく、具体的には、塩化アルミニウム、硝酸アルミニウムなどのアルミニウム化合物が挙げられる。これらのケイ素源及びアルミニウム源は、上記の化合物に限定されるものではなく、それらと同効のものであれば同様に使用可能である。   As a raw material for synthesizing the aluminum silicate of the present invention, an inorganic silicon compound and an inorganic aluminum compound are used. The reagent used as the silicon source may be a monosilicate compound, and specific examples thereof include sodium orthosilicate, sodium metasilicate, amorphous colloidal silicon dioxide (such as Aerosil) and the like. On the other hand, the aluminum source to be bonded to the silicate molecule may be an aluminum ion, and specifically includes aluminum compounds such as aluminum chloride and aluminum nitrate. These silicon sources and aluminum sources are not limited to the above compounds, and can be used in the same manner as long as they have the same effect.

本発明においては、これらの原料をそれぞれ適切な水溶液に溶解させ、所定の濃度の溶液を調整する。次に、これらの溶液を混合して反応させるが、その際、任意の比率で混合しても前駆体の形成に問題はないが、好適にはケイ素/アルミニウム比は0.3〜0.7になるように混合する。ケイ素化合物溶液及びアルミニウム化合物溶液の濃度は、如何なる濃度からの合成でも前駆体は生成するが、好適な濃度としては、1〜500mmol/lのケイ素化合物溶液と1〜1000mmol/lのアルミニウム化合物溶液を混合することが好ましい。
このアルミニウム化合物溶液にケイ素化合物溶液を混合した後、アルカリ性溶液を滴下し、弱酸性から中性付近にpHを調整し、前駆体を形成させる。
In the present invention, each of these raw materials is dissolved in an appropriate aqueous solution to prepare a solution having a predetermined concentration. Next, these solutions are mixed and reacted. At that time, even if they are mixed at an arbitrary ratio, there is no problem in the formation of the precursor, but preferably the silicon / aluminum ratio is 0.3 to 0.7. Mix to become. The concentrations of the silicon compound solution and the aluminum compound solution are the precursors produced by synthesis from any concentration, but suitable concentrations include 1 to 500 mmol / l silicon compound solution and 1 to 1000 mmol / l aluminum compound solution. It is preferable to mix.
After mixing a silicon compound solution with this aluminum compound solution, an alkaline solution is dropped, and the pH is adjusted from weakly acidic to near neutral to form a precursor.

前駆体の生成工程において、中和反応に用いるアルカリ性溶液としては、例えば、水酸化ナトリウム、水酸化カリウム、アンモニアなどの溶液が挙げられる。また、前駆体を分散させる酸性溶液としては、塩酸、硝酸、過塩素酸などが挙げられる。本発明のアルミニウムケイ酸塩を得るには、好適には溶液のpHが3〜7程度の範囲で合成される。   Examples of the alkaline solution used for the neutralization reaction in the precursor generation step include solutions of sodium hydroxide, potassium hydroxide, ammonia, and the like. Examples of the acidic solution in which the precursor is dispersed include hydrochloric acid, nitric acid, perchloric acid and the like. In order to obtain the aluminum silicate of the present invention, the solution is preferably synthesized with a pH of about 3 to 7.

次に、その前駆体を含む溶液を、遠心分離、濾過または膜分離等の適宜の手段を用いて、溶液中の共存イオンを取り除く脱塩処理を施した後、回収した前駆体を純水あるいは酸性水溶液に分散させる。このときのpHは3〜7であるが、好適には4〜5.5の範囲である。その後、得られた前駆体の分散溶液を室温にて攪拌させながら一定時間のエージングを行う。その室温におけるエージングとしては、通常20〜30℃において5分〜48時間、好ましくは10分〜6時間である。   Next, the solution containing the precursor is subjected to a desalting treatment for removing coexisting ions in the solution by using an appropriate means such as centrifugation, filtration or membrane separation, and then the recovered precursor is purified with pure water or Disperse in acidic aqueous solution. The pH at this time is 3 to 7, but is preferably in the range of 4 to 5.5. Thereafter, aging is performed for a predetermined time while stirring the obtained dispersion solution of the precursor at room temperature. The aging at room temperature is usually 5 minutes to 48 hours at 20 to 30 ° C., preferably 10 minutes to 6 hours.

次にエージングした前駆体分散溶液を乾燥させることにより、目的としたアルミニウムケイ酸塩を得ることができる。またこのときの乾燥温度は100℃以下であるが、好適には0〜80℃である。   Next, the target aluminum silicate can be obtained by drying the aged precursor dispersion. Moreover, although the drying temperature at this time is 100 degrees C or less, it is 0-80 degreeC suitably.

上記の方法で得られたアルミニウムケイ酸塩は、多量の微細孔を持つチューブ状多孔体であって、各種物質の吸着剤として使用できるものであり、その優れた吸着性などの特性を活用することにより、物質の回収や貯蔵、除湿、水分の乾燥、有害物質の除去、可燃性物質の貯蔵及び脱臭などに利用できるものであり、例えば、ヒートポンプ熱交換材、天然ガス等の貯蔵、湿度を自律的に制御する湿度調節剤、デシカントローター作成のためのデシカント剤、香料等の吸着媒体や化粧品、有害汚染物質の吸着剤や脱臭剤または速乾性乾燥剤等に応用可能であり、特に生活環境において最適な湿度に調整する自律的調湿材料として有効に利用できるものである。   The aluminum silicate obtained by the above method is a tubular porous body having a large amount of fine pores and can be used as an adsorbent for various substances, and utilizes its excellent properties such as adsorptivity. It can be used for recovery and storage of substances, dehumidification, drying of moisture, removal of harmful substances, storage and deodorization of flammable substances, for example, storage of heat pump heat exchange materials, natural gas, etc. Applicable to humidity control agents that control autonomously, desiccants for desiccant rotor production, adsorbents such as fragrances and cosmetics, adsorbents and deodorizers for quick pollutants, or quick-drying desiccants. It can be effectively used as an autonomous humidity conditioning material that adjusts to the optimum humidity.

実施例
以下、本発明を実施例によりさらに具体的に説明するが、本発明はこれらの実施例によって何ら限定されるものではない。
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

SiO濃度が75mmol/lになるように、純水で希釈したオルトケイ酸ナトリウム水溶液250mlを調整した。またこれとは別に、塩化アルミニウムを純水に溶解させ、150mmol/l水溶液250mlを調整した。
次に、塩化アルミニウム水溶液にオルトケイ酸ナトリウム水溶液を混合し、マグネティックスターラーで撹拌した。このときのケイ素/アルミニウム比は0.5である。さらにこの混合溶液に1N水酸化ナトリウム水溶液43mlを滴下し、pHが6になるように調整した。
この溶液から遠心分離により前駆体を回収し、さらに純水で前駆体を3回遠心分離により洗浄した後、2lの純水中に分散させた。
この前駆体の懸濁液2lに1N塩酸を8ml加えた後、室温で攪拌させながら1時間のエージングを行った。その後、50℃で約3日間乾燥させることによりアルミニウムケイ酸塩を得た。
250 ml of sodium orthosilicate aqueous solution diluted with pure water was adjusted so that the SiO 2 concentration became 75 mmol / l. Separately, aluminum chloride was dissolved in pure water to prepare 250 ml of a 150 mmol / l aqueous solution.
Next, the sodium orthosilicate aqueous solution was mixed with the aluminum chloride aqueous solution and stirred with a magnetic stirrer. The silicon / aluminum ratio at this time is 0.5. Furthermore, 43 ml of 1N aqueous sodium hydroxide solution was added dropwise to the mixed solution to adjust the pH to 6.
The precursor was recovered from this solution by centrifugation, and the precursor was further washed by centrifugation three times with pure water, and then dispersed in 2 l of pure water.
After 8 ml of 1N hydrochloric acid was added to 2 l of this precursor suspension, aging was performed for 1 hour while stirring at room temperature. Thereafter, aluminum silicate was obtained by drying at 50 ° C. for about 3 days.

得られたアルミニウムケイ酸塩は、図1に示したように、粉末X線回折において、2θ=3.5°、8.5°、26°、40°付近に比較的大きいブロードなピークを示し、さらに2θ=16.5°、33.5°、44.5°、54°、66°付近に僅かではあるが小さいブロードなピークを示した。またその水蒸気吸着等温線は、図2に見られるように、相対湿度30%において約18重量%、相対湿度80%において約43重量%の水蒸気を吸着していた。
これに対し、従来の加熱合成イモゴライト(特開2004-59330号公報の実施例1で得られたもの)は、図2に見られるように、相対湿度30%において約22重量%、相対湿度80%において約34重量%の水蒸気を吸着している。
相対湿度30%と相対湿度80%における吸着量の差は、本実施例のアルミニウムケイ酸塩の方が、従来公知の加熱合成イモゴライトよりも約2倍の値を有していた。
As shown in FIG. 1, the obtained aluminum silicate shows relatively large broad peaks around 2θ = 3.5 °, 8.5 °, 26 °, and 40 ° in powder X-ray diffraction. In addition, 2θ = 16.5 °, 33.5 °, 44.5 °, 54 °, and 66 ° showed a small but small broad peak. Further, as shown in FIG. 2, the water vapor adsorption isotherm adsorbed about 18% by weight of water vapor at 30% relative humidity and about 43% by weight at 80% relative humidity.
On the other hand, the conventional heat-synthesized imogolite (obtained in Example 1 of JP-A-2004-59330) has a relative humidity of about 22% by weight and a relative humidity of 80% as seen in FIG. % Adsorbs about 34% by weight of water vapor.
The difference in the amount of adsorption between the relative humidity of 30% and the relative humidity of 80% was about twice that of the conventionally known heat-synthesized imogolite in the aluminum silicate of this example.

SiO濃度が60mmol/lになるように、純水で希釈したオルトケイ酸ナトリウム水溶液250mlを調整した。またこれとは別に、塩化アルミニウムを純水に溶解させ、150mmol/l水溶液250mlを調整した。
次に、塩化アルミニウム水溶液にオルトケイ酸ナトリウム水溶液を混合し、マグネティックスターラーで撹拌した。このときのケイ素/アルミニウム比は0.4である。さらにこの混合溶液に1N水酸化ナトリウム水溶液52mlを滴下し、pHが6になるように調整した。
この溶液から遠心分離により前駆体を回収し、さらに純水で前駆体を3回遠心分離により洗浄した後、2lの純水中に分散させた。
この前駆体の懸濁液2lに1N塩酸を8ml加えた後、室温で1時間攪拌させることによりエージングを行った。その後、50℃で約3日間乾燥させることによりアルミニウムケイ酸塩を得た。
250 ml of sodium orthosilicate aqueous solution diluted with pure water was adjusted so that the SiO 2 concentration was 60 mmol / l. Separately, aluminum chloride was dissolved in pure water to prepare 250 ml of a 150 mmol / l aqueous solution.
Next, the sodium orthosilicate aqueous solution was mixed with the aluminum chloride aqueous solution and stirred with a magnetic stirrer. The silicon / aluminum ratio at this time is 0.4. Further, 52 ml of a 1N sodium hydroxide aqueous solution was added dropwise to this mixed solution to adjust the pH to 6.
The precursor was recovered from this solution by centrifugation, and the precursor was further washed by centrifugation three times with pure water, and then dispersed in 2 l of pure water.
After 8 ml of 1N hydrochloric acid was added to 2 l of this precursor suspension, aging was carried out by stirring at room temperature for 1 hour. Thereafter, aluminum silicate was obtained by drying at 50 ° C. for about 3 days.

得られたアルミニウムケイ酸塩は、図1に示したように、粉末X線回折において、2θ=3.5°、8.5°、26°、40°付近に比較的大きいブロードなピークを示し、さらに2θ=16.5°、33.5°、44.5°、54°、66°付近に僅かではあるが小さいブロードなピークを示した。   As shown in FIG. 1, the obtained aluminum silicate shows relatively large broad peaks around 2θ = 3.5 °, 8.5 °, 26 °, and 40 ° in powder X-ray diffraction. In addition, 2θ = 16.5 °, 33.5 °, 44.5 °, 54 °, and 66 ° showed slight but small broad peaks.

本発明は、広範な湿度領域の湿度調節に有用なアルミニウムケイ酸塩からなる高機能な無機質多孔質材料を安価に提供するものであって、水分子のほか、無機物質及び有機物質などを多量にかつ簡易に吸着・脱着できるから、工業的及び家庭的使用に好適な吸着剤として多様な産業分野に利用できるものである。   The present invention provides a low-cost, highly functional inorganic porous material made of aluminum silicate that is useful for humidity control in a wide range of humidity, and contains a large amount of inorganic substances and organic substances in addition to water molecules. In addition, since it can be easily adsorbed and desorbed, it can be used in various industrial fields as an adsorbent suitable for industrial and household use.

本発明の実施例1及び実施例2で得られたアルミニウムケイ酸塩の粉末X線回折図である。It is a powder X-ray diffraction pattern of the aluminum silicate obtained in Example 1 and Example 2 of the present invention. 本発明の実施例1で得られたアルミニウムケイ酸塩(■印)と従来の合成イモゴライト(●印)を用いた水蒸気吸着等温線を示すグラフである。It is a graph which shows the water vapor | steam adsorption isotherm using the aluminum silicate (■ mark) obtained in Example 1 of this invention, and the conventional synthetic imogolite (● mark).

Claims (4)

酸化物のモル比で次の組成:SiO・xAl・yHO(式中、x=0.5〜2.0、y=0〜15)からなり、かつ粉末X線回折スペクトルにおいて、ブラッグ角(2θ±0.5°)3.5°、8.5°、26°及び40°に大きいブロードなピークを有することを特徴とするアルミニウムケイ酸塩。 It consists of the following composition in terms of the molar ratio of oxide: SiO 2 · xAl 2 O 3 · yH 2 O (wherein x = 0.5 to 2.0, y = 0 to 15), and powder X-ray diffraction spectrum An aluminum silicate having a broad peak at a Bragg angle (2θ ± 0.5 °) of 3.5 °, 8.5 °, 26 ° and 40 °. さらにブラッグ角(2θ±0.5°)16.5°、33.5°、44.5°、54°及び66°に小さいブロードなピークを有することを特徴とする請求項1に記載のアルミニウムケイ酸塩。 The aluminum according to claim 1, further having small broad peaks at a Bragg angle (2θ ± 0.5 °) of 16.5 °, 33.5 °, 44.5 °, 54 ° and 66 °. Silicate. 無機ケイ素化合物溶液と無機アルミニウム化合物溶液を混合してアルミニウムケイ酸塩を形成させ、これを脱塩処理して得られるアルミニウムケイ酸塩の分散溶液をエージングさせた後、100℃以下の温度で乾燥させることを特徴とする請求項1または2に記載のアルミニウムケイ酸塩の合成方法。 An inorganic silicon compound solution and an inorganic aluminum compound solution are mixed to form an aluminum silicate, and then a dispersion solution of aluminum silicate obtained by desalting is aged and then dried at a temperature of 100 ° C. or lower. The method for synthesizing an aluminum silicate according to claim 1 or 2, wherein: 請求項1または2に記載のアルミニウムケイ酸塩からなることを特徴とする吸着剤。
An adsorbent comprising the aluminum silicate according to claim 1 or 2.
JP2004263269A 2004-09-10 2004-09-10 Novel aluminum silicate and its synthesis method Expired - Fee Related JP4631022B2 (en)

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* Cited by examiner, † Cited by third party
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JP2009174783A (en) * 2008-01-25 2009-08-06 National Institute Of Advanced Industrial & Technology Adsorption type heat pump system using low temperature waste heat
CN105170079A (en) * 2015-10-13 2015-12-23 无锡普爱德环保科技有限公司 Method for preparing dehumidizer
CN114956107A (en) * 2022-07-15 2022-08-30 大家智合(北京)网络科技股份有限公司 Modified aluminum silicate powder and preparation method thereof, degradable composite membrane and preparation method and application thereof

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Title
JPN6009039490, TOMURA, S. et al., "Synthesis of Allophane from Dilute Solution of Silica and Alumina", Solvo−thermal Reactions, 1996, Vol. 2, p. 207−209 *
JPN6009039492, 鈴木正哉他, "高濃度溶液からのアロフェン・イモゴライトの合成(3)", 2000年年会講演予稿集, 2000, p. 97, 日本セラミックス協会 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009174783A (en) * 2008-01-25 2009-08-06 National Institute Of Advanced Industrial & Technology Adsorption type heat pump system using low temperature waste heat
CN105170079A (en) * 2015-10-13 2015-12-23 无锡普爱德环保科技有限公司 Method for preparing dehumidizer
CN114956107A (en) * 2022-07-15 2022-08-30 大家智合(北京)网络科技股份有限公司 Modified aluminum silicate powder and preparation method thereof, degradable composite membrane and preparation method and application thereof
CN114956107B (en) * 2022-07-15 2023-11-07 大家智合(北京)网络科技股份有限公司 Modified aluminum silicate powder and preparation method thereof, degradable composite film and preparation method and application thereof

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