1. Institute for Chemical and Environmental Technology, National Research Council of Canada, 1200 Montreal Road, Ottawa, Ontario K1A 0R6, Canada
2. V. Bede Technical Associates, 614 La Verendrye Drive, Ottawa, Ontario K1J 7C4, Canada
3. Edmonton Research Centre, Syncrude Canada Limited, 9421-17 Avenue, Edmonton, Alberta T6N 1H4, Canada