August 28, 2007

PQ Corporation Names New CFO

PQ Corporation, the chemicals and engineered glass materials company, announced today that Alan McIlroy, currently the company's Vice President of Strategic Planning, has been appointed to the position of Vice President and CFO, effective immediately.

He replaces Jim Cox, Vice President and CFO, who will leave the company at the end of September, after a transition, to pursue other opportunities.

Mr. McIlroy became Vice President of Strategic Planning in April, 2005 when he joined PQ. Prior to assuming this position, Mr. McIlroy was Chief Financial Officer and Vice President of Operations with Workhorse Custom Chassis from 2004 to 2005 and Chief Financial Officer for Dayton Superior Corporation from 1997 through 2004. Earlier, Mr. McIlroy was President of the Greenock Group from 1994 to 1997, Senior Vice President at Harris Chemical Group from 1990 to 1994 and Controller for General Chemical's Soda Ash division from 1987 to 1990.

Michael R. Boyce, the Chairman and CEO of PQ commented, "We are very excited to have Alan take on his new leadership role in the company and look forward to his continuing as a key contributor to our team. We also want to thank Jim for his contributions over the past 31 years."

About PQ Corporation

PQ Corporation is a leading producer of specialty inorganic chemicals, catalysts and engineered glass materials. The Company conducts operations through three principal businesses: the Performance Chemicals division, which develops, manufactures and distributes sodium silicate and related high performance silicate-based specialty chemicals, the Catalysts division, which manufactures high performance catalytic zeolites and zeolite-based catalysts and polyolefin catalysts, and the Potters division, which manufactures highly engineered solid and hollow glass spheres used in highway safety and other specialty applications. The Company's products are used in a variety of predominantly niche applications in a diverse range of industrial, consumer and municipal end-markets. The Company operates 60 manufacturing sites in 19 countries on five continents and has one of the most comprehensive global manufacturing and distribution networks serving customers in the Company's end-markets.