Tetrapropylammonium Hydroxide (20-25% in Water) TCI T1020

Chemical Identity

CAS No.: 4499-86-9
PubChem: CID 20586·SID 87576824
Formula: C12H29NO
Molecular weight: 203.36 g/mol
Reference databases: ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: tetrapropylazanium hydroxide
SMILES: CCC[N+](CCC)(CCC)CCC.[OH-]
InChIKey: LPSKDVINWQNWFE-UHFFFAOYSA-M

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Tetrapropylammonium Hydroxide (20-25% in Water) from TCI, catalog code T1020, is a strongly basic organic solution containing the tetrapropylammonium cation and the hydroxide anion in water. In the laboratory it is best known as a structure-directing agent (SDA) in the synthesis of zeolites and other porous materials, especially MFI-type zeolites such as silicalite-1, ZSM-5, and titanium silicalite-1 (TS-1). It is also used as a strong, alkali-metal-free base in a range of reactions, making it a useful reagent for both materials chemistry and synthetic work.

Researchers choose this reagent because the tetrapropylammonium cation has a size and shape that suits the "templating" of MFI zeolite pore channels during hydrothermal crystallization. After calcination, the organic cation burns away and leaves the porous framework behind. The hydroxide form supplies the basicity needed to dissolve a silica source without introducing sodium or potassium ions, which matters when the final material must be free of alkali metals. Supplying the reagent as a solution also makes it easier to measure and dose accurately.

In Indonesia, catalysis, chemical engineering, and materials chemistry laboratories at universities and research institutions work extensively on zeolite development, for example for processing vegetable oils and biomass. In these settings, this solution is typically used as the template and base in the preparation of MFI-type catalysts and supports. It is usually handled in a fume hood, with measured volumes added to a silica-containing synthesis gel before hydrothermal treatment.

TCI brochures (PDF)

Quaternary Ammonium Salts 2025-11-10 · p. 2
Colloidal Quantum Dot (QD) Research Reagents 2026-05-21 · p. 10

Related TCI products

Synthesis of silicalite-1: the tetrapropylammonium cation directs the formation of the MFI framework, and the hydroxide form supplies the basicity needed to dissolve the silica source without adding alkali metals.
Preparation of ZSM-5 zeolites: the solution acts as the structure-directing agent for the MFI topology, allowing researchers to study catalysts for processing vegetable oils and biomass.
Synthesis of titanium silicalite-1 (TS-1): the reagent provides both templating and alkalinity, so titanium can be incorporated into the MFI framework in a metal-free alkaline environment.
Use as a strong alkali-metal-free base: the hydroxide form suits reactions where sodium or potassium ions would interfere with the reaction or contaminate the product.
Development of porous materials for catalysis research: the template can be removed by calcination, leaving open pore channels that support studies of catalysts and supports in chemical engineering and materials chemistry.

Brand	TCI
CAS number	4499-86-9
Molecular formula	—
Purity	—
Category	Chemistry > Synthetic Reagents > Acids, Bases [Synthetic Reagents]
Pack sizes	—
Physical form	—
Storage	Keep tightly closed in a suitable container, away from incompatible materials and moisture; follow the supplier's label and safety data sheet

Catalog code: T1020
Form: Aqueous solution, 20-25% in water

Store Tetrapropylammonium Hydroxide solution in its original, tightly closed container, in a cool, well-ventilated place away from acids and other incompatible materials. Because it is a strong base, use containers made of compatible materials, and keep the cap closed to limit contact with air and moisture. Handle it in a fume hood while wearing chemical-resistant gloves, safety goggles, and a laboratory coat, as it can cause serious skin and eye damage. Avoid contact with skin, eyes, and clothing. Label any secondary containers clearly, and dispose of waste according to institutional and local regulations. Always consult the supplier's safety data sheet before use.

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