About Clay Catalyst Support Grade
Clay catalyst support grade is an acid-activated montmorillonite designed as a carrier for catalytically active species. Its developed pore volume and high surface area make it a practical base for impregnation with metal salts such as zinc chloride or iron chloride, heteropoly acids and other active components used in specialty chemical synthesis.
A good support has to disperse the active phase, keep it accessible and hold up mechanically in the reactor. Acid activation opens the clay structure and creates mesopores into which impregnating solutions can penetrate, distributing the active species over a large internal area instead of leaving it as crystals on the outer surface. The clay's own acidity can work alongside the supported species, which is the basis of well-known clay-supported Lewis acid catalysts for Friedel–Crafts alkylation and acylation. The grade is supplied as powder for slurry reactions and as granules or pellets for fixed beds, where crush strength and low attrition matter.
Obsidian Minerals controls surface area, pore characteristics, moisture and particle size for this grade and reports agreed parameters on the batch Certificate of Analysis from our NABL-accredited laboratory. A Technical Data Sheet and MSDS/SDS are supplied with each shipment. We work with customers to adjust activation level and particle form for specific impregnation routes, and samples are available on request for catalyst development.
Typical specifications
| Parameter | Typical Value | Test Method |
|---|---|---|
| Specific surface area | 180–280 m²/g | BET, nitrogen adsorption |
| Total pore volume | 0.30–0.50 cm³/g | Nitrogen adsorption |
| pH (10 % slurry) | 3.0–4.5 | Internal method |
| Free moisture (105 °C) | ≤ 10 % | Internal method |
| Physical form | Powder, granules or pellets; sizes on request | — |
| Thermal stability | Up to approx. 400 °C | — |
Typical values for guidance. Guaranteed limits are stated on the Technical Data Sheet and batch CoA. Performance of the finished supported catalyst depends on the impregnation route and should be confirmed by the customer.
Key features & benefits
Open mesoporous structure
Acid activation creates a pore network that the clay catalyst support grade uses to take up impregnating solutions, spreading the active species across a large internal surface area.
Cooperative support acidity
The support's own Brønsted and Lewis acid sites can work together with impregnated metal salts or acids, which is useful in Friedel–Crafts and related acid-catalysed reactions.
Choice of physical form
Available as powder for slurry systems and as granules or pellets for fixed beds, so the same support chemistry can move from laboratory screening to continuous production.
Thermal robustness
Stable up to about 400 °C, the support tolerates drying and moderate calcination steps used after impregnation, provided temperatures stay within the limit of the clay structure.
Applications
Clay-supported Lewis acid catalysts
Base material for zinc chloride, iron chloride and similar supported Lewis acids used in Friedel–Crafts alkylation and acylation, where the solid catalyst simplifies separation and handling.
Supported heteropoly acid catalysts
Carrier for heteropoly acids and other strong acids in esterification, etherification and alkylation reactions, dispersing the acid over a large surface and allowing filtration or fixed-bed use.
Custom catalyst development
Used by catalyst developers and chemical producers as a porous, acidic carrier for new active formulations, from early laboratory screening through to pilot and production scale.
Usage & handling
- Pre-dry the support before impregnation so pore volume is available for the solution, staying below about 400 °C.
- Use incipient wetness or excess solution impregnation, matching solution volume to the measured pore volume.
- Dry and, where required, calcine the impregnated material within the thermal limit of the clay.
- Store the support in sealed bags in a dry area to preserve pore volume and surface activity.
Packaging & supply
- 25 kg or 50 kg HDPE or paper bags
- 1 MT or 1.2 MT FIBC jumbo bags
- Smaller sample packs for catalyst development on request
Frequently asked questions
What can be impregnated onto the clay catalyst support grade?
Common choices include metal salts such as zinc chloride, iron chloride and copper salts, heteropoly acids and other inorganic acids. The acid-activated clay provides surface area, porosity and its own acidity. Compatibility with each active species and the final catalyst performance should be verified by the customer through laboratory screening.
What pore volume does the catalyst support grade offer?
Typical total pore volume is in the range of about 0.30 to 0.50 cm³/g, measured by nitrogen adsorption, with specific surface area typically 180 to 280 m²/g. These values guide the impregnation solution volume. Batch values for agreed parameters are reported on the Certificate of Analysis, and guaranteed limits appear on the Technical Data Sheet.
Is the catalyst support available as pellets for fixed-bed reactors?
Yes. Besides powder, the support grade can be supplied as granules or pellets for fixed-bed use, with sizes agreed against your reactor design and pressure drop limits. Share the required dimensions and crush strength target, and we will confirm what can be produced and supply samples for testing.
How should the clay support be prepared before impregnation?
Dry the support to remove adsorbed water so the pores are free to take up the impregnating solution, keeping temperatures well below about 400 °C. Measure the pore volume of the dried material, then match the solution volume for incipient wetness impregnation. Store the dried support sealed until use to avoid re-adsorbing moisture.