NDLI: Silicalite-l Synthesis from Silicate Aqueous Solutions Including Amines as a Base

Content Provider	Springer Nature Link
Author	Ban, Takayuki Mitaku, Hideki Suzuki, Chiharu Kume, Takashi Ohya, Yutaka Takahashi, Yasutaka
Copyright Year	2005
Abstract	Aqueous silicate solutions could be prepared from a silicon alkoxide using amines as a base. The synthesis of silicalite-1 conducted by hydrothermally treating the solutions after the addition of NPr$^{n}$$_{4}$Br (TPABr), was examined focusing on triethylamine (NEt$_{3}$) as the amine. The aqueous solutions with chemical compositions of Si(OEt)$_{4}$ (TEOS) : NEt$_{3}$ : TPABr : H$_{2}$O = 1 : ≥0.5 : ≥0.8 : 200 led to silicalite-1 crystallization upon hydrothermal treatment at 130C for 4 days. The resulting crystals had a small thin coffin shape. With increasing the added amounts of NEt$_{3}$ and TPABr, the crystal size decreased. Among the investigated conditions, the smallest silicalite-1 crystal measuring about 1.0 × 0.7 × 0.4 um was obtained at starting compositions of NEt$_{3}$/TEOS ≥2.0 and TPABr/TEOS ≥3.2. The increase in the TPA content of the starting solutions accelerated the crystal nucleation of silicalite-1, so that the obtained crystals became smaller. During the hydrothermal synthesis, an amorphous silica gel was formed before the crystallization commenced. The increase in the NEt$_{3}$ content may suppress the formation of the silica gel, and/or facilitate its dissolution, thereby the supersaturation degree of silicate species in the solution was increased, giving small silicalite-1 crystals. When an aqueous suspension of the smallest silicalite-1 crystals was spread onto a glass substrate by a dip-coating method, an ordered mono-grain layer of the silicalite-1 crystals oriented with the straight channels normal to the substrate surface was obtained.
Starting Page	255
Ending Page	263
Page Count	9
File Format	PDF
ISSN	13802224
Journal	Journal of Porous Materials
Volume Number	12
Issue Number	4
e-ISSN	15734854
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	zeolite silicalite-1 crystal morphology amine silicate aqueous solution Physical Chemistry Catalysis Characterization and Evaluation Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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