JP2016169139A - Method for producing afx-type zeolite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing an AFX-type zeolite having a high degree of crystallinity.SOLUTION: There is provided a method for producing an AFX-type zeolite, which comprises subjecting a raw material mixture composed of (1) a silica source, (2) an alumina source, (3) a hydroxide or halide of N,N,N',N'-tetraalkylbicyclo[2.2.2]octo-7-ene-2,3:5,6-dipyrrolidinium (provided that alkyl groups may be the same or different) as a template, (4) an alkali metal hydroxide or an alkaline earth metal hydroxide and (5) water to hydrothermal treatment, wherein the amount of alumina (in terms of Al) is 5 to 25 mols based on 100 mols of the silica (in terms of SiO) in the silica source and the alumina source.SELECTED DRAWING: None

Description

  The present invention relates to a method for producing an AFX zeolite having a high crystallinity.

AFX type zeolite (SSZ-16) is an aluminosilicate zeolite first synthesized in 1986 (Patent Document 1). Its pore size is 0.33-0.35 nm, which is especially small among zeolites, and its molecular sieving action is expected to be used as a catalyst to selectively obtain lower olefins by naphtha cracking or methanol-to-olefin reaction. . In recent years, the application as an automobile exhaust gas catalyst has attracted attention, and it can be used as a selective NOx reduction (SCR) catalyst by supporting copper or iron ions.
Conventional AFX-type zeolite crystals have been known to be obtained by using 1,4-diazabicyclo [2.2.2] octane (DABCO) or a quinuclidine derivative as an organic templating agent (SDA) (Patent Document 1). 2, Non-Patent Document 1, etc.), and its synthesis method does not necessarily have a high crystallinity. In addition, the AFX-type zeolite crystals produced in this way have low crystallinity, and as a SCR catalyst, they have the drawback of having a short life compared to general-purpose zeolites such as SSZ-13 and ZSM-5 (non-patent) Reference 2).
In addition, N, N, N ′, N′-tetraalkylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidinium used as a template in the present invention is MSE-type zeolite or the like. It is a well-known template used for the synthesis of (Patent Documents 3, 4, etc.).

US Patent No. 4,589,976 US Patent No. 5,194,235 US Patent No. 6,049,018 JP 2014-43371

Chem. Mater. 1996, 8, 2409-2411 Appl. Catal., B: Environ., 2011, 102, 441

In the conventional production method of AFX type zeolite (SSZ-16) (Patent Document 1, Non-Patent Document 1), the crystallinity is not high, and the inventors have based on the methods described in Patent Document 1 and Non-Patent Document 1. As a result, there was a problem that the ANA phase was easily produced as a by-product, the degree of crystallinity was lowered by baking removal of the template, and AFX became completely amorphous by acid treatment of about 1 mol / L ( Data not shown).
An object of the present invention is to provide a method for producing an AFX-type zeolite having a high crystallinity.

As a result of studying a template for synthesizing an AFX zeolite, the present inventors have determined that N, N, N ′, N′-tetraalkylbicyclo [2.2.2] oct-7-ene-2 as a template. , 3: 5,6-dipyrrolidinium, it was found that highly crystalline AFX zeolite can be obtained, and the present invention has been completed.
That is, the present invention provides (1) silica source, (2) alumina source, and (3) N, N, N ′, N′-tetraalkylbicyclo [2.2.2] oct-7-ene-2 as a template. , 3: 5,6-dipyrrolidinium (wherein the alkyl groups may be the same or different), (4) alkali metal hydroxide or alkaline earth metal hydroxide And (5) hydrothermal treatment of the raw material mixture comprising water, and the amount of alumina (converted to Al) is 5 to 25 moles per 100 moles of silica (converted to SiO ₂ ) in the silica source and alumina source. Is an AFX type zeolite (as-synthesized as synthesized).

It is a figure which shows the crystal structure of AFX type zeolite. a is a part of the crystal structure of AFX zeolite, b is an AFT cage, and c is a GME cage. It is a SEM photograph of the obtained AFX type zeolite. (a) shows Example 1, (b) shows the AFX type zeolite (after calcination) synthesized in Comparative Example 1. 1 is a powder X-ray diffraction spectrum diagram of AFX-type zeolite (as synthesized) obtained in Example 1. FIG. 3 is a powder X-ray diffraction spectrum diagram of AFX-type zeolite (after calcination) obtained in Example 1. FIG. 3 is a powder X-ray diffraction spectrum diagram of AFX-type zeolite (as synthesized) obtained in Comparative Example 1. FIG. 4 is a powder X-ray diffraction spectrum diagram of AFX-type zeolite (after calcination) obtained in Comparative Example 1. FIG.

The AFX-type zeolite of the present invention is an aluminosilicate given the three-letter code “AFX” by the International Zeolite Association Structure Commission (IZA-SC), and has a skeletal topology specified by the space group and atomic coordinates in Table 1. Have. The analysis results in Table 1 are for a specific substance of the AFX type, especially SSZ-16, and the lattice constants are in the range of a (= b) = 13.6 ± 0.1 A, c = 19.7 ± 0.1 A depending on the substance. Slightly changes.

  FIG. 1 shows a part of the crystal structure of AFX-type zeolite as a spherical rod model. Of the two types of spheres, large spheres represent silicon or aluminum atoms, and small spheres represent oxygen atoms. AFX-type zeolite (FIG. 1 (a)) is a zeolite having a three-dimensional pore structure of an oxygen 8-membered ring (0.33 nm × 0.35 nm). The pore is composed of two cages of different sizes, one is a cage that is long in the z-axis direction with 9 windows (AFT cage, 1.38 nm × 0.56 nm, Fig. 1 (b)), and the other is 3 This is a cage (GME cage, 0.74 nm × 0.33 nm, Fig. 1 (c)) with two windows.

The process for producing the AFX zeolite of the present invention comprises hydrothermally treating the raw material mixture.
(A) Raw material mixture The raw material mixture used in this application is (1) silica source, (2) alumina source, and (3) N, N, N ′, N′-tetraalkylbicyclo [2.2.2] oct as a template. -7-ene-2,3: 5,6-dipyrrolidinium hydroxide or halide, (4) alkali metal hydroxide or alkaline earth metal hydroxide, and (5) water.

Examples of the silica source used in the present invention include Y-type zeolite, sodium silicate, colloidal silica, fumed silica, silicon alkoxide, quartz and the like, preferably fumed silica.
Examples of the alumina source used in the present invention include Y-type zeolite, aluminum hydroxide, sodium aluminate, aluminum hydroxide oxide, aluminum oxide and the like, and preferably Y-type zeolite.
Note that Y-type zeolite may be used to serve as both a silica source and an alumina source.

で表されるＮ，Ｎ，Ｎ'，Ｎ'−テトラアルキルビシクロ［２．２．２］オクト−７−エン−２，３：５，６−ジピロリジニウムであり、この化合物は二価陽イオンである。
式中、Ｒ^１及びＲ^２（これらはいずれもアルキル基である）は、それぞれ、同じであっても異なってもよく、その炭素数は、好ましくは１〜６、より好ましくは１〜４であり、Ｒ^１及びR^２の炭素数の合計は、好ましくは２〜８、より好ましくは２〜４である。また、Ｒ^１及びＲ^２はそれらが結合する窒素原子と共同して環を形成してもよく、この環の炭素数は、好ましくは３〜７、より好ましくは４〜５である。
このアルキル基としては、例えば、CH₃-、CH₃CH₂-、CH₃CH₂CH₂-、(CH₃)₂CH-、
CH₃CH₂CH₂CH₂-、(CH₃)₂CHCH₂-、CH₃CH₂(CH₃)CH-、(CH₃)₃C-、シクロブチル、シクロペンチル、シクロヘキシル等を挙げることができる。
この化合物(鋳型)は、通常水酸化物又はハロゲン化物（ヨウ化物、臭化物、塩化物、フッ化物）として用いる。 The mold (SDA) used in the present invention has the following formula

N, N, N ′, N′-tetraalkylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidinium represented by the formula: is there.
In the formula, R ¹ and R ² (both of which are alkyl groups) may be the same or different, and the carbon number thereof is preferably 1 to 6, more preferably 1 to 4. Yes, the total number of carbon atoms of R ¹ and R ² is preferably 2-8, more preferably 2-4. R ¹ and R ² may form a ring together with the nitrogen atom to which they are bonded, and the number of carbon atoms in this ring is preferably 3 to 7, more preferably 4 to 5.
Examples of this alkyl group include CH _3- , CH ₃ CH _2- , CH ₃ CH ₂ CH _2- , (CH ₃ ) ₂ CH-,
CH ₃ CH ₂ CH ₂ CH ₂ —, (CH ₃ ) ₂ CHCH ₂ —, CH ₃ CH ₂ (CH ₃ ) CH—, (CH ₃ ) ₃ C—, cyclobutyl, cyclopentyl, cyclohexyl and the like can be mentioned.
This compound (template) is usually used as a hydroxide or halide (iodide, bromide, chloride, fluoride).

The alkali metal hydroxide or alkaline earth metal hydroxide used in the present invention is preferably an alkali metal hydroxide, for example, LiOH, NaOH, KOH, CsOH, Mg (OH) ₂ , Ca (OH) ₂ , Sr (OH) ₂ or Ba (OH) ₂ , preferably NaOH. In the case of KOH, a purity of 85% or more is used. In other cases, a purity of 95% or more is used, diluted to 5 to 50% with deionized water, or previously diluted.
The water used is preferably high-purity water, for example, ion-exchanged water (deionized water).

The ratio of the silica source to the alumina source is such that the amount of alumina (converted to Al) is 5 to 25 mol, preferably 8 to 15 mol, with respect to 100 mol of silica (converted to SiO ₂ ) in the silica source and alumina source. To be. If the amount of alumina is further reduced, other phases such as MSE-type zeolite are by-produced. When the amount of alumina is further increased, crystallization of the AFX zeolite does not occur.
Further, the mold is 10 to 50 mol, preferably 10 to 30 mol, and the alkali metal hydroxide or alkaline earth metal hydroxide is 1 to 30 mol, preferably 10 to 10 mol, per 100 mol of silica (SiO ₂ ). 30 mol and water are used in a proportion of 500 to 10000 mol, preferably 2000 to 7000 mol.

(B) Hydrothermal treatment Hydrothermal treatment is performed under the following conditions.
-Temperature: The heating temperature is 100 to 200 ° C, preferably 150 to 175 ° C. The heating time is generally 20 to 400 hours, preferably 40 to 200 hours. If this temperature is too low, condensation does not proceed. On the other hand, if this temperature is too high and organic substances such as templates are decomposed, AFX-type zeolite cannot be obtained.
-Time: Usually 2 to 16 days If the time is shorter than this range, crystallization becomes insufficient, while if it is longer, another phase (for example, ANA phase) may be by-produced.
The hydrothermal reaction is preferably carried out using an autoclave.
After completion of the hydrothermal reaction, solid-liquid separation, washing, and drying are performed to obtain an as-synthesized AFX zeolite.

(C) Product The as-synthesized AFX-type zeolite obtained in this step is represented by the following composition formula.
M _{(n-2m) / l} Q _m Si _48-n Al _n O ₉₆
(Where n is 6 to 18, m is 1.5 to 2.5, M is a metal cation (typically Na), 1 is the valence of M, and Q is derived from the template (Chemical Formula 1). Indicates a cation.)
The X-ray diffraction data includes the following values. (Peak with an intensity ratio of 10% or more)
2θ = 7.46 ± 0.15, 8.68 ± 0.15, 11.56 ± 0.15, 12.98 ± 0.15, 15.00 ± 0.15, 15.64 ± 0.15 17.42 ± 0.15, 17.66 ± 0.15, 19.90 ± 0.15, 20.38 ± 0.15, 21.80 ± 0.15, 22.60 ± 0.15, 23. 40 ± 0.15, 26.16 ± 0.15, 27.72 ± 0.15, 30.64 ± 0.15, 31.62 ± 0.15, 33.50 ± 0.15

(D) Firing The obtained crystalline silicate may be fired thereafter. Firing is usually performed using a muffle furnace or a tubular furnace in an atmosphere of O ₂ : N ₂ = 0: 100 to 100: 0, preferably 20:80 to 30:70, and a flow rate of 0.1 to 100 ml / min. For 1 to 12 hours. The temperature is 400 to 800 ° C, preferably 550 to 650 ° C.
The calcined AFX zeolite is represented by the following composition formula.
M _{(n-2m) / l} H _2m Si _48-n Al _n O ₉₆
(In the formula, n, m, M and l are the same as described above.)
This crystalline porous silicate has the above-mentioned AFX structure and has a skeletal topology specified by the space group and atomic coordinates in Table 1 above.

The X-ray diffraction data of the AFX zeolite after calcination includes the following values. (Peak with an intensity ratio of 10% or more)
2θ = 7.46 ± 0.15, 8.70 ± 0.15, 11.64 ± 0.15, 12.94 ± 0.15, 14.94 ± 0.15, 15.60 ± 0.15 17.44 ± 0.15, 17.90 ± 0.15, 19.82 ± 0.15, 20.32 ± 0.15, 21.78 ± 0.15, 23.68 ± 0.15, 26. 04 ± 0.15, 28.08 ± 0.15, 30.14 ± 0.15, 30.52 ± 0.15, 31.52 ± 0.15, 33.72 ± 0.15
The calcined AFX zeolite is hexagonal bipyramidal particles having a length L in the major axis (c-axis) direction of 400 to 600 nm and a length D in the minor axis (a or b axis) direction of 300 to 500 nm.

The following examples illustrate the invention but are not intended to limit the invention.
X-ray diffraction (XRD) was measured under the following conditions.
Equipment used: Rigaku Ultima IV powder X-ray analyzer
X-ray source: CuKα = 1.5405Å, applied voltage: 40 kV, tube current: 20 mA
Measuring range: 2θ = 2.040 ~ 52.000deg
Scan speed: 2.000 deg./min, Sampling interval: 0.040 deg.
Diverging slit: 1.00 deg, Scattering slit: 1.00 deg, Receiving slit: 0.30 mm
Vertical goniometer, using monochromator Measurement method: Continuous method, Normal method In addition, in X-ray diffraction measurement, the sample stage is made of glass with a 20 mm x 20 mm x 0.2 mm groove, and the powder sample is in this groove. The setting was made while pressing it with a glass plate so that it fits in.
Scanning electron microscope (SEM) photographs were measured under the following conditions.
Equipment used: JEOL JSM-7001F
Acceleration voltage: 3.00 kV

ビシクロ[2.2.2]オクト-7-エン-2,3:5,6-テトラカルボン酸二無水物（アルドリッチ製）15.7 g (63 mmol)にエチルアミン（関東化学）(70wt% in water) 100 ml (1.26 mol)を加えて室温で2時間攪拌した。ここに蒸留水(46 ml)を加え、70℃で24時間、次いで100℃で20時間攪拌した。放冷後、濃塩酸（11ml）をpHが約2になるまでゆっくり滴下した。これを吸引濾過し、蒸留水(500 ml)で洗浄して得られた固体を乾燥した。生成物（N,N'-ジエチルビシクロ[2.2.2]オクト-7-エン-2,3:5,6-テトラカルボキシジイミド）の収量は17.1 g (収率 90%)であった。 Production Example 1
In this production example, the template used in Example 1 described later was synthesized.
First, N, N′-diethylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-tetracarboxydiimide was synthesized as shown in the following formula.

Bicyclo [2.2.2] oct-7-ene-2,3: 5,6-tetracarboxylic dianhydride (manufactured by Aldrich) 15.7 g (63 mmol) to ethylamine (Kanto Chemical) (70 wt% in water) 100 ml (1.26 mol) was added and stirred at room temperature for 2 hours. Distilled water (46 ml) was added thereto, and the mixture was stirred at 70 ° C. for 24 hours and then at 100 ° C. for 20 hours. After allowing to cool, concentrated hydrochloric acid (11 ml) was slowly added dropwise until the pH reached about 2. This was subjected to suction filtration, washed with distilled water (500 ml), and the solid obtained was dried. The yield of the product (N, N′-diethylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-tetracarboxydiimide) was 17.1 g (90% yield).

N₂雰囲気の1000 ml 二口フラスコに水素化リチウムアルミニウム(LiAlH₄、和光純薬製) 6.2 g (164 mmol)を入れ、攪拌しながらテトラヒドロフラン(THF) 300 mlを加え、攪拌を開始した。ここに上記で得たジイミド体16.0 g (53 mmol)を少しずつ加え、THF (240 ml)で洗い入れた。その後68時間還流下攪拌した。放冷後、過剰のLiAlH₄を分解するために、よく撹拌しながら蒸留水(6.2 g)、15wt% NaOH (6.2 g)、蒸留水(18.7 g)を約30分間隔で順次ゆっくり加え、さらに2時間攪拌した。次にグラスフィルター(G3)を用いて吸引濾過後、フィルター上の固形物をTHF (120 mL)でよく洗浄し、濾液と洗液を合わせて減圧濃縮した。得られた油状物質から水分を完全に除去し、油状の生成物（N,N'-ジエチルビシクロ[2.2.2]オクト-7-エン-2,3:5,6-ジピロリジン）を得た。収量は12.1 g (収率 93%)であった。 Next, N, N′-diethylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidine was synthesized.

6.2 g (164 mmol) of lithium aluminum hydride (LiAlH ₄ , manufactured by Wako Pure Chemical Industries, Ltd.) was added to a 1000 ml two-necked flask in an N ₂ atmosphere, and 300 ml of tetrahydrofuran (THF) was added while stirring, and stirring was started. The diimide body 16.0 g (53 mmol) obtained above was added little by little here, and it washed in with THF (240 ml). Thereafter, the mixture was stirred for 68 hours under reflux. After allowing to cool, distilled water (6.2 g), 15 wt% NaOH (6.2 g), and distilled water (18.7 g) were added slowly in order at intervals of about 30 minutes with sufficient stirring to decompose excess LiAlH _4. Stir for 2 hours. Next, after suction filtration using a glass filter (G3), the solid matter on the filter was thoroughly washed with THF (120 mL), and the filtrate and the washing solution were combined and concentrated under reduced pressure. Water was completely removed from the obtained oily substance to obtain an oily product (N, N′-diethylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidine). The yield was 12.1 g (93% yield).

上記で合成したジピロリジン体12.1 g (49 mmol)をエタノール(EtOH) 90 mLに溶解し、攪拌しつつヨウ化エチル(EtI) 17 ml (212 mmol)を滴下した後157時間還流下攪拌した。放冷後、アセトン100 mlを加え、これをグラスフィルター(G3)で吸引濾過して結晶生成物を得た。この結晶生成物をアセトン（80 ml x 2）で加熱洗浄して放冷後、アセトン(50 ml)及びベンゼン(40 ml)で順次洗浄し、真空乾燥した。生成物（N,N,N',N'-テトラエチルビシクロ[2.2.2]オクト-7-エン-2,3:5,6-ジピロリジニウム二ヨウ化物）の収量は19.4 g(収率 71%)であった。
生成物の分析値を以下に示す。
¹H NMR(400 MHz, D₂O) δ: 1.25 (12H, t, J=7.2Hz, -CH₃), 2.82 (8H, s, CH-CH ₂-N⁺), 2.89 (2H, s, -CH=CH-), 3.28 (8H, q, J=7.5Hz, CH₃-CH ₂-N⁺), 3.78 (4H,d, CH-CH-CH₂), 6.42 (2H, t, J=3.8 Hz, -CH-CH=)
¹³C NMR(100 MHz, D₂O) δ: 8.14, 8.99, 33.71, 40.59, 53.32, 56.24, 65.05, 134.75 Next, N, N, N ′, N′-tetraethylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidinium diiodide was synthesized.

12.1 g (49 mmol) of the dipyrrolidine compound synthesized above was dissolved in 90 mL of ethanol (EtOH), and 17 ml (212 mmol) of ethyl iodide (EtI) was added dropwise with stirring, followed by stirring under reflux for 157 hours. After allowing to cool, 100 ml of acetone was added, and this was suction filtered through a glass filter (G3) to obtain a crystalline product. The crystalline product was washed by heating with acetone (80 ml × 2), allowed to cool, then washed successively with acetone (50 ml) and benzene (40 ml) and dried in vacuo. The yield of the product (N, N, N ', N'-tetraethylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidinium diiodide) is 19.4 g (71% yield) Met.
The analytical value of the product is shown below.
¹ H NMR (400 MHz, D ₂ O) δ: 1.25 (12H, t, J = 7.2Hz, -CH ₃ ), 2.82 (8H, s, CH-C H ₂ -N ⁺ ), 2.89 (2H, s , -CH = CH-), 3.28 (8H, q, J = 7.5Hz, CH ₃ -C H ₂ -N ⁺ ), 3.78 (4H, d, CH-C H -CH ₂ ), 6.42 (2H, t , J = 3.8 Hz, -C H -CH =)
¹³ C NMR (100 MHz, D ₂ O) δ: 8.14, 8.99, 33.71, 40.59, 53.32, 56.24, 65.05, 134.75

三角フラスコ中で、製造例１で得たN,N,N',N'-テトラエチルビシクロ[2.2.2]オクト-7-エン-2,3:5,6-ジピロリジニウム二ヨウ化物(8.83 g, 15.8 mmol)を蒸留水(100 ml)に溶解した。これに、強塩基性陰イオン交換樹脂（三菱化学株式会社製 SA10A(OH)）45 gと蒸留水100 mlを加えて、室温で48時間穏やかに撹拌した。これを濾過し、16.5gまで減圧濃縮し、蒸留水で(28.7 g)に希釈して、N, N, N', N'-テトラエチルビシクロ[2. 2. 2]オクト-7-エン-2,3:5,6-ジピロリジニウムジヒドロキシド（以下「TEBOP²⁺(OH^-)₂」という。）を得た。0.05 M HClで滴定した結果、濃度(Ｒ²⁺として)0.516 mmol/g、交換率 93.6 %であった。
¹H NMR(400 MHz, D₂O) δ: 1.21 (12H, t, J=7.3Hz, -CH₃), 2.77 (8H, s, CH-CH ₂-N⁺), 2.84 (2H, s, -CH=CH-), 3.24 (8H, q, J=7.5Hz, CH₃-CH ₂-N⁺), 3.73 (4H,d, CH-CH-CH₂), 6.37 (2H, t, J=3.8 Hz, -CH-CH=)
¹³C NMR(100 MHz, D₂O) δ: 7.93, 8.81, 33.62, 40.54, 53.17, 56.16, 64.95, 134.61 Next, N, N, N ′, N′-tetraethylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidinium dihydroxide was synthesized.

In an Erlenmeyer flask, N, N, N ′, N′-tetraethylbicyclo [2.2.2] oct-7-ene-2,3: 5,6-dipyrrolidinium diiodide obtained in Production Example 1 (8.83 g, 15.8 mmol) was dissolved in distilled water (100 ml). To this, 45 g of strongly basic anion exchange resin (SA10A (OH) manufactured by Mitsubishi Chemical Corporation) and 100 ml of distilled water were added and gently stirred at room temperature for 48 hours. This was filtered, concentrated under reduced pressure to 16.5 g, diluted to 28.7 g with distilled water, and N, N, N ′, N′-tetraethylbicyclo [2.2.2] oct-7-ene-2 , 3: 5,6-dipyrrolidinium dihydroxide (hereinafter referred to as “TEBOP ²⁺ (OH ⁻ ) ₂ ”). As a result of titration with 0.05 M HCl, the concentration (as R ²⁺ ) was 0.516 mmol / g, and the exchange rate was 93.6%.
¹ H NMR (400 MHz, D ₂ O) δ: 1.21 (12H, t, J = 7.3Hz, -CH ₃ ), 2.77 (8H, s, CH-C H ₂ -N ⁺ ), 2.84 (2H, s , -CH = CH-), 3.24 (8H, q, J = 7.5Hz, CH ₃ -C H ₂ -N ⁺ ), 3.73 (4H, d, CH-C H -CH ₂ ), 6.37 (2H, t , J = 3.8 Hz, -C H -CH =)
¹³ C NMR (100 MHz, D ₂ O) δ: 7.93, 8.81, 33.62, 40.54, 53.17, 56.16, 64.95, 134.61

1,4-ジアザビシクロ-[2.2.2]-オクタン（アルドリッチ製）51.51g(450mmol)を1Lナスフラスコに入れ、続いて400mLのアセトンを加え、室温で10分間撹拌した。ここに1,4-ジブロモブタン(和光純薬工業株式会社製)17.66g(80mmol)を15分間かけて滴下し、80mLのアセトンで洗い入れた。その後37時間室温で撹拌した。次にグラスフィルター(G4)を用いて吸引濾過後、フィルター上の固形物をアセトン(150mL)およびベンゼン(200mL)でよく洗浄し、真空乾燥した。生成物(DAB-4-Br)の収量は35.36g(収率100%)であった。生成物(DAB-4-Br)の分析値を以下に示す。
¹H-NMR (400 MHz, D₂O) : δ1.91~1.94(m, 4H, C-CH ₂ -CH ₂ -C), 3.26(t, J=7.4 Hz, 12H, NCH₂), 3.36~3.45(m, 4H, N⁺CH₂), 3.48(t, J=7.4 Hz, 12H, N⁺CH₂)
¹³C-NMR (100 MHz, D₂O) : δ19.46, 45.03, 53.07 and 64.20(CH₂)
IR (KBr) [cm^-1] 596, 704, 793, 845, 901, 988, 1057, 1101, 1325, 1383, 1468, 1641, 2893, 2963, 3425 Production Example 2
In this production example, the template used in Comparative Example 1 described later (1,1′-tetramethylenebis (1-azonia-4-azabicyclo [2.2.2] octane) dihydroxide, referred to as “Dab-4-OH”) Was synthesized.
First, as shown by the following formula, 1,1′-tetramethylenebis (1-azonia-4-azabicyclo [2.2.2] octane) dibromide (Dab-4-Br) was synthesized.

51.51 g (450 mmol) of 1,4-diazabicyclo- [2.2.2] -octane (manufactured by Aldrich) was placed in a 1 L eggplant flask, followed by addition of 400 mL of acetone and stirring at room temperature for 10 minutes. To this, 17.66 g (80 mmol) of 1,4-dibromobutane (manufactured by Wako Pure Chemical Industries, Ltd.) was added dropwise over 15 minutes and washed with 80 mL of acetone. Thereafter, the mixture was stirred at room temperature for 37 hours. Next, after suction filtration using a glass filter (G4), the solid matter on the filter was thoroughly washed with acetone (150 mL) and benzene (200 mL) and dried in vacuo. The yield of the product (DAB-4-Br) was 35.36 g (yield 100%). The analytical value of the product (DAB-4-Br) is shown below.
¹ H-NMR (400 MHz, D ₂ O): δ1.91 ~ 1.94 (m, 4H, CC H ₂ -C H ₂ -C), 3.26 (t, J = 7.4 Hz, 12H, NCH ₂ ), 3.36 ~ 3.45 (m, 4H, N ⁺ CH ₂ ), 3.48 (t, J = 7.4 Hz, 12H, N ⁺ CH ₂ )
¹³ C-NMR (100 MHz, D ₂ O): δ19.46, 45.03, 53.07 and 64.20 (CH ₂ )
IR (KBr) [cm ^-1 ] 596, 704, 793, 845, 901, 988, 1057, 1101, 1325, 1383, 1468, 1641, 2893, 2963, 3425

上記で合成したDAB-4-Br 35.17 gを500mL PPボトルに入れ、続いて強塩基性陰イオン交換樹脂（三菱化学株式会社製 SA10A(OH)）182.66gを加えた。次にH₂O(Milli-Q)350mLを加え、容器を軽く振り混ぜたのち60時間冷暗所に静置した。次にグラスフィルター(G4)により吸引濾過し、フィルター上の樹脂をH₂O(Milli-Q)200mLでよく洗浄し、濾液と洗液を合わせて減圧濃縮した。得られた溶液の重量は127.31gであり、0.05Mの塩酸滴定により求めたOH体(DAB-4-OH)の濃度は0.534mmol/g(イオン交換率91%)であった。Dab-4-BrからDab-4-OHへの変換は単なるイオン交換であり、そのNMRスペクトルはDab-4-Brと同様である。 Next, DAB-4-Br was converted to DAB-4-OH as shown in the following formula.

35.17 g of DAB-4-Br synthesized above was put into a 500 mL PP bottle, and then 182.66 g of strongly basic anion exchange resin (SA10A (OH) manufactured by Mitsubishi Chemical Corporation) was added. Next, 350 mL of H ₂ O (Milli-Q) was added, the container was shaken lightly, and then left to stand in a cool dark place for 60 hours. Next, the solution was suction filtered through a glass filter (G4), and the resin on the filter was thoroughly washed with 200 mL of H ₂ O (Milli-Q). The filtrate and the washing solution were combined and concentrated under reduced pressure. The weight of the obtained solution was 127.31 g, and the concentration of OH form (DAB-4-OH) determined by 0.05 M hydrochloric acid titration was 0.534 mmol / g (ion exchange rate 91%). Conversion from Dab-4-Br to Dab-4-OH is merely ion exchange, and its NMR spectrum is the same as Dab-4-Br.

Example 1
Place Y-type zeolite (H _30.5 Al _30.5 Si _161.5 O ₃₈₄ , Tosoh, HSZ-350HUA) 1.84 g (20 mmol, SiO ₂ ) in a fluororesin (PTFE) container with an internal volume of 23 mL, 2.87 g of H ₂ O (Milli-Q), TEBOP ²⁺ (OH ⁻ ) ₂ aqueous solution (0.489 mmol / g) obtained in Production Example 1 was added successively with 4.09 g and 0.543 g NaOH aqueous solution (3.68 mmol / g). The composition of the resulting mixture is 1.0 SiO ₂ −0.094 Al ₂ O ₃ −0.10 TEBOP ²⁺ (OH ⁻ ) ₂ −0.10 NaOH−20 H ₂ O. After the Y-type zeolite was well dispersed in the liquid, it was allowed to stand in an oven at 160 ° C. for 10 days using an autoclave. The resulting solid product was collected by filtration and dried in a 100 ° C. oven for 90 minutes. The weight of the resulting white powder (as synthesized; XRD shown in FIG. 3) was 1.89 g. Of this, 1.15 g was placed in a petri dish made of alumina, heated from room temperature at a rate of 1 ° C. per minute in an air atmosphere in a muffle furnace, held at 600 ° C. for 2 hours, and then allowed to cool. In this way, 0.975 g of white powder (after baking) was obtained.
The SEM photograph of the obtained crystals after firing is shown in FIG. 2 (a), and the X-ray diffraction analysis results are shown in FIGS. Table 2 shows the result of X-ray diffraction analysis of the crystal after calcination, and for comparison, publicly known data of AFX zeolite (Patent Document 1) is listed. Only the AFX phase was recognized from the XRD pattern (FIGS. 3, 4 and 2). The Si / Al value by elemental analysis was 6.1. According to SEM observation, hexagonal bipyramidal particles having a particle diameter of about 500 nm were confirmed (FIG. 2 (a)).

Comparative Example 1
31.37 g of the DAB-4-OH aqueous solution (0.574 mmol / g) obtained in Production Example 2 was placed in a 125 mL fluororesin (PTFE) container, and 6.77 g of NaOH aqueous solution (3.68 mmol / g), 10.40 g of H ₂ O (Milli-Q) and 42.41 g of an aqueous sodium silicate solution (SiO ₂ : 23.1 wt%, Na ₂ O: 5.96 wt%) were sequentially added.
The container was gently shaken to make the mixture uniform, and then left at room temperature for 30 minutes. Next, 3.89 g of Y-type zeolite (H _50.5 Al _50.5 Si _141.5 O ₃₈₄ , Tosoh, HSZ-320HOA) was added and dispersed in the liquid by gently shaking the container. The composition of the resulting mixture is 1.0 SiO ₂ −0.033 Al ₂ O ₃ −0.09 Dab-4-OH−0.55NaOH-20 H ₂ O. Next, it was left still in an oven at 140 ° C. for 43 hours using an autoclave. The resulting solid product was collected by centrifugation and dried in a 100 ° C. oven overnight. The weight of the obtained white powder (as synthesized) was 5.19 g. Of this, 4.59 g was placed in a petri dish made of alumina, heated from room temperature at a rate of 1 ° C. per minute in an air atmosphere in a muffle furnace, held at 520 ° C. for 3 hours, and then allowed to cool. The white powder thus obtained (after calcination) was 4.35 g.
The SEM photograph of the obtained crystal after firing is shown in FIG. 2 (b), and the results of X-ray diffraction analysis are shown in FIGS. From the XRD pattern of the as-synthesized and fired samples, only the AFX phase was observed (FIGS. 5 and 6, Table 2). The Si / Al value by elemental analysis was 4.4. According to SEM observation, the particles had an unclear morphology with a particle size of about 200 nm (FIG. 2 (b)).

It is clear from the SEM photograph that the AFX zeolite of the present invention has high crystallinity (FIG. 2 (a) with respect to FIG. 2 (b)).
Moreover, the X-ray diffraction analysis of the crystal obtained in Example 1 and the crystal obtained in Comparative Example 1 is performed under the same conditions, and the peak intensity and half-value width of each peak of the X-ray diffraction after firing are compared. It shows in Table 2. Compared with the crystal obtained in Comparative Example 1, the crystal obtained in Example 1 has a higher peak intensity at each peak and a smaller half width. That is, it can be said that the crystal obtained in Example 1 has higher crystallinity than the crystal obtained in Comparative Example 1.
Since the AFX zeolite of the present invention has high crystallinity, it is considered that when used in a catalytic reaction, hydrothermal stability and catalyst life are improved.

Claims (6)

(1) Silica source, (2) Alumina source, (3) N, N, N ′, N′-tetraalkylbicyclo [2.2.2] oct-7-ene-2, 3: 5,6 as template -Hydroxides or halides of dipyrrolidinium (wherein the alkyl groups may be the same or different), (4) alkali metal hydroxides or alkaline earth metal hydroxides, and (5) water Of the AFX type zeolite, wherein the amount of alumina (converted to Al) is 5 to 25 moles per 100 moles of silica (converted to SiO ₂ ) in the silica source and the alumina source. Manufacturing method. The produced AFX zeolite is represented by the following composition formula:
M _{(n-2m) / l} Q _m Si _48-n Al _n O ₉₆
(Wherein n is 6 to 18, m is 1.5 to 2.5, M is a metal cation, l is a valence of M, Q is a cation derived from a template), X-ray diffraction data is Including the following values:
2θ = 7.46 ± 0.15, 8.68 ± 0.15, 11.56 ± 0.15, 12.98 ± 0.15, 15.00 ± 0.15, 15.64 ± 0.15 17.42 ± 0.15, 17.66 ± 0.15, 19.90 ± 0.15, 20.38 ± 0.15, 21.80 ± 0.15, 22.60 ± 0.15, 23. 40 ± 0.15, 26.16 ± 0.15, 27.72 ± 0.15, 30.64 ± 0.15, 31.62 ± 0.15, 33.50 ± 0.15
The manufacturing method of Claim 1. The process according to claim 1 or 2, wherein the hydrothermal treatment is performed in an autoclave. A method for producing an AFX type zeolite, comprising further calcining the AFX type zeolite obtained in any one of claims 1 to 3. The process according to claim 4, wherein the calcining is heating the synthesized AFX zeolite at 400 to 800 ° C. The produced AFX zeolite is represented by the following composition formula:
M _{(n-2m) / l} H _2m Si _48-n Al _n O ₉₆
(Where n, m, M and l represent the same as above), the X-ray diffraction data includes the following values:
2θ = 7.46 ± 0.15, 8.70 ± 0.15, 11.64 ± 0.15, 12.94 ± 0.15, 14.94 ± 0.15, 15.60 ± 0.15 17.44 ± 0.15, 17.90 ± 0.15, 19.82 ± 0.15, 20.32 ± 0.15, 21.78 ± 0.15, 23.68 ± 0.15, 26. 04 ± 0.15, 28.08 ± 0.15, 30.14 ± 0.15, 30.52 ± 0.15, 31.52 ± 0.15, 33.72 ± 0.15
The manufacturing method of Claim 4 or 5.

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