Topotactic conversion of β-helix-layered silicate into AST-type zeolite through successive interlayer modifications.

Topotactic conversion of β-helix-layered silicate into AST-type zeolite through successive interlayer modifications.

Chemistry (Weinheim an der Bergstrasse, Germany) (2014-01-17)

Yusuke Asakura, Ryosuke Takayama, Toshimichi Shibue, Kazuyuki Kuroda

ABSTRACT

AST-type zeolite with a plate morphology can be synthesized by topotactic conversion of a layered silicate (β-helix-layered silicate; HLS) by using N,N-dimethylpropionamide (DPA) to control the layer stacking of silicate layers and the subsequent interlayer condensation. Treatment of HLS twice with 1) hydrochloric acid/ethanol and 2) dimethylsulfoxide (DMSO) are needed to remove interlayer hydrated Na ions and tetramethylammonium (TMA) ions in intralayer cup-like cavities (intracavity TMA ions), both of which are introduced during the preparation of HLS. The utilization of an amide molecule is effective for the control of the stacking sequence of silicate layers. This method could be applicable to various layered silicates that cannot be topotactically converted into three-dimensional networks by simple interlayer condensation by judicious choice of amide molecules.

MATERIALI

N° Catalogo

Marchio

Descrizione del prodotto

E7023

Sigma-Aldrich

Ethyl alcohol, Pure, 200 proof, for molecular biology

D2650

Sigma-Aldrich

Dimetil solfossido, Hybri-Max^™, sterile-filtered, BioReagent, suitable for hybridoma, ≥99.7%

472301

Sigma-Aldrich

Dimetil solfossido, ACS reagent, ≥99.9%

D8418

Sigma-Aldrich

Dimetil solfossido, for molecular biology

459844

Sigma-Aldrich

Ethyl alcohol, Pure, 200 proof, ACS reagent, ≥99.5%

34869

Sigma-Aldrich

Dimetil solfossido, suitable for HPLC, ≥99.7%

221465

Sigma-Aldrich

Sodio idrossido, ACS reagent, ≥97.0%, pellets

D2438

Sigma-Aldrich

Dimetil solfossido, sterile-filtered, BioPerformance Certified, meets EP, USP testing specifications, suitable for hybridoma

S5881

Sigma-Aldrich

Sodio idrossido, reagent grade, ≥98%, pellets (anhydrous)

D5879

Sigma-Aldrich

Dimetil solfossido, ReagentPlus^®, ≥99.5%

415413

Sigma-Aldrich

Idrossido di sodio, 50% in H₂O

493546

Sigma-Aldrich

Ethyl alcohol, Pure, 200 proof, meets USP testing specifications

D4540

Sigma-Aldrich

Dimetil solfossido, ≥99.5% (GC), suitable for plant cell culture

270555

Sigma-Aldrich

N,N-dimetilacetammide, suitable for HPLC, ≥99.9%

72068

Sigma-Aldrich

Idrossido di sodio, BioUltra, for molecular biology, 10 M in H₂O

41640

Sigma-Aldrich

Dimetil solfossido, puriss. p.a., ACS reagent, ≥99.9% (GC)

38840

Sigma-Aldrich

N,N-dimetilacetammide, puriss. p.a., ≥99.5% (GC)

S8045

Sigma-Aldrich

Sodio idrossido, BioXtra, ≥98% (acidimetric), pellets (anhydrous)

S2770

Sigma-Aldrich

Idrossido di sodio, 1.0 N, BioReagent, suitable for cell culture

30620

Sigma-Aldrich

Sodio idrossido, puriss. p.a., ACS reagent, reag. Ph. Eur., K ≤0.02%, ≥98%, pellets

D137510

Sigma-Aldrich

N,N-dimetilacetammide, ReagentPlus^®, 99%

06203

Sigma-Aldrich

Sodio idrossido, puriss., meets analytical specification of Ph. Eur., BP, NF, E524, 98-100.5%, pellets

655104

Sigma-Aldrich

Sodio idrossido, reagent grade, 97%, powder

185884

Sigma-Aldrich

N,N-dimetilacetammide, ReagentPlus^®, ≥99%

276855

Sigma-Aldrich

Dimetil solfossido, anhydrous, ≥99.9%

02870

Sigma-Aldrich

Etanolo, ACS reagent, prima fine spirit, without additive, F15 o¹

306576

Sigma-Aldrich

Sodio idrossido, pellets, semiconductor grade, 99.99% trace metals basis

02856

Sigma-Aldrich

Etanolo, purum, absolute ethanol, denaturated with 4.8% isopropanol, A15 IPA¹, ≥99.8% (based on denaturant-free substance)

41639

Sigma-Aldrich

Dimetil solfossido, BioUltra, for molecular biology, ≥99.5% (GC)

51976

Sigma-Aldrich

Etanolo, BioUltra, for molecular biology, ≥99.8%, (absolute alcohol, without additive, A15 o¹)