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Catalysts
PQ's Catalysts Group supplies products based on both silica and zeolite chemistry to a broad range of catalyst applications.

The Silica Catalysts business supplies custom catalysts and supports that can be tailored to a wide range of specific needs.  Our silica supports are used in the production of chrome, Ziegler-Natta, single site, and specialty catalysts that find application in the manufacture of high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), and other polymers.  These polymers are used in a wide variety of applications including films, blow-molded products, wire and cable sheathings, and pipes.  Our supports and catalysts are used in both gas-phase and slurry-phase processes.  We are a key global supplier of chrome-on-silica catalysts for the production of HDPE.  PQ's Silica Catalysts business operates plants in Rahway, New Jersey; Kansas City, Kansas; and Warrington, UK.  We can produce silicas with both granular and microspherical morphologies.

Zeolite catalysts and supports used in a variety of chemical and petrochemical applications are offered by Zeolyst International, a partnership between PQ Corporation–experts in silicate and zeolite technology–and CRI/Criterion Inc. (an affiliate of Shell Global Solutions)–experts in catalyst and process technology.  For further information, please visit the Zeolyst International website.
How It Works
In the case of chrome-on-silica catalysts, which are widely used in the polymerization of ethylene into polyethylene, it has long been recognized that the function of silica gel is not merely to provide a high surface area support for the metal.  In fact, the properties of the silica gel profoundly affect the polymerization process as well as the properties of the growing polymer itself.  For example, increased silica surface area leads to increased polymerization activity, while increased silica pore size leads to increased melt index (which is related to polymer molecular weight).

Utilizing our state-of-the-art manufacturing processes, we carefully control surface area, pore volume, particle size, impurity levels, metal content, and surface chemistry to produce a wide range of catalysts suitable for the differing requirements of HDPE used in a variety of applications including films, blow-molded products, wire and cable sheathings, and pipes. 

In addition to chrome-on-silica, we also offer modified chromium catalysts containing aluminum or titanium to provide performance enhancements needed for certain end uses, such as reduced induction time and increased activity, melt index, and environmental stress crack resistance.  

In addition to our HDPE catalysts, PQ in a manufacturer of custom catalysts for chemical synthesis.  We work closely with our customers to develop tailor-made catalysts that meet their specific performance requirements.  We are interested in working with you to develop customized silica-supported catalysts for your chemical process.
Recommended Literature
 TitleModified DateSize 
PQ Silica Catalysts Brochure7/12/2011673.59 KBDownload
Applications
HDPE
LLDPE
Polypropylene
Other polymers
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