[1] Rhein Westfal TH Aachen, Inst Tech & Makromol Chem, D-52074 Aachen, Germany
[2] DECHEMA EV, Karl Winnacker Inst, D-60486 Frankfurt, Germany
[3] Rhein Westfal TH Aachen, ITMC, CAT Catalyt Ctr, D-52074 Aachen, Germany
[4] Max Planck Inst Kohlenforsch, D-45470 Mulheim, Germany