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Catalysis & Inorganic

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Catalysts, the precursors they are made from, and the inorganic salts that feed both. This is the range where the catalogue name tells you least: two materials both described as 5% palladium on carbon can differ in dispersion, support and moisture content enough that one works in your hydrogenation and the other does not.

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In this range

Listed on the TSS storefront and searchable there by name or CAS number. Every enquiry is contracted and invoiced by Taitil Global Inc. in the United States or Europe.

Specifying it

What decides the purchase

The compound is usually fixed by the route. These are the things that vary between suppliers and between lots.

  1. Loading is not the specification — dispersion is

    Metal loading tells you how much metal is present, not how much of it is available. Two 5% Pd/C catalysts with the same loading can differ several fold in active surface area depending on how the metal was deposited. If a hydrogenation is sluggish on a new lot at the same loading, dispersion is the first thing to ask about.

  2. The support changes the chemistry

    Carbon, alumina, silica and barium sulfate are not interchangeable carriers. Carbon adsorbs product and complicates recovery; alumina brings surface acidity that can catalyse side reactions; sulfated supports suppress over-reduction. Specify the support explicitly rather than accepting whatever the grade name implies.

  3. Wet, dry, reduced or unreduced

    Precious-metal catalysts are frequently supplied water-wet at 50% for safety, because the dry material can ignite in air. That changes what you weigh out and how you handle it. Reduced and unreduced forms behave differently on first use. Both belong on the enquiry, because assuming the wrong one is a lost batch rather than a lost afternoon.

  4. Residual metal is the downstream problem

    If the product feeds a pharmaceutical route, the elemental impurity limits in USP <232> apply to it and the catalyst is the obvious source. Ask what leaching behaviour the supplier has seen and whether the material has been used in regulated work. This is easier to establish before purchase than after an ICP result.

Questions

Why is palladium on carbon supplied wet?
Dry precious-metal catalyst on carbon is pyrophoric — it can ignite on contact with air, particularly after use when it is loaded with hydrogen. Supplying it at around 50% water content makes it safe to handle and ship. It also means the mass you weigh is roughly half catalyst, which has to be accounted for in the charge. Dry grades exist where the chemistry requires them and are shipped under inert atmosphere.
Does the catalyst support really change the outcome?
Frequently. The support governs surface area, how strongly substrate and product adsorb, and whether the surface itself is acidic or basic. A reduction that is clean on palladium-on-barium-sulfate can over-reduce on palladium-on-carbon at the same loading, because the carbon holds the intermediate at the metal surface for longer. If a published procedure names a support, treat it as part of the specification.
What documentation ships with a catalyst?
A Certificate of Analysis reporting metal content, moisture and the physical form, and a safety data sheet — which for these materials carries handling requirements that matter, since several are pyrophoric. Where the material feeds a regulated route, ask for the elemental impurity data as well rather than assuming it is on the standard certificate.