1. US 7.749.762 (2016 BASF); US 5.166.454 (1982 Mobil); US 4.013.584 (1978 Texaco); US 5.821.270 (1999 Exxon); US 5.672.801 (1997 IFP); US 5.817.895 (1998 Ausimont); US 5.817.589 (1998 Intevep); US 5.817.702 (1998 Exxon); US 5.880.050 (1999 IFP); US 5.916.835 (1999 RCO); US 5.973.012 (1999 Exxon); US 6.323.248 (2001 Exxon); WO 99/39.827 (1999 Bayer); US 5.037.785 (1989); Benaglia; Marafi/Stanislaus/Furimsky Chapter6;
2. Gary/Handwerk p. 93 ff; Ertl/Knözinger/Schüth/Weitkamp Vol. 4 p.1829;
3. Ullmann Vol.A5 p. 360 Kirk/Othmer Vol. 5 p.419;
4. Anderson/Boudart Vol. 6 p. 1.; Butt/Petersen; Trimm; Twigg p.176;
5. Farrauto/Bartholomew p.291;