[1] Department of Fuel and Energy, Sch. Process, Environ. and Mat. Eng., University of Leeds, Leeds LS2 9JT, United Kingdom
[2] PPG Industries, Inc., Glass Technical Center, PO Box 11472, Pittsburgh, PA 15238, United States
[3] The BOC Group, Group Technical Center, Murray Hill, NJ 07974, United States
[4] FlameTec, 12620 Treeline Court, North Fort Myers, FL 33903, United States