Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

OP-III-13The reforming reaction was carried outby feeding CH 3 OH together with Ar as asweep gas at 200-300 °C, using an effectivetube length of 0.8 m (heated zone). As shownin Table 1, with the bare alumina tube(Run 1), CH 4 conversion was nil.Al20 μmAl 2 O 3100 nm(a) Cross section (b) Inner surfaceFig. 2. SEM images of anode oxidized of aluminum.With a loading level of 2.8 mg/m-tubeTable1 Results of SRM using wall tube reactorcombined weight of Cu and Zn oxides,aCatalyst preparationmethanol conversion of 23.9% wasImpregCH3OH H2Catalyst W/F cobserved. If the catalyst adsorption time wasRun -nationconv. mmolweight g.h/moltime repe% /hprolonged from 2 to 12 h, the loading levelmg/m bh -titionincreased from 2.8 to 4.5 mg/ m-tube at 8 h,with an increase in CH 3 OH conversion to60.2% (Run 5). Since elongation of thecatalyst loading time did not significantlyincrease the amount of loading, catalystloading process was repeated as shown inRuns 6-9. With increasing repetitionnumber, catalyst loading increased. Whenimpregnation procedures were repeated fourtimes, the loading level reached to12.4 mg/m-tube, leading to methanolconversion of 45.5% and 98.8% at 200 °Cand 250 °C, respectively, with a very lowCO selectivity at 200 °C (Runs 9, 10).Thus wall tube reactor was found to exhibit an excellent performance in the SRM.selectivity%COCO21 d 0 0 00 0 0.2 00.0 0.0 00.02 d 2 1 02.8 0.10 23.9 28.3 3.2 91.53 d 4 1 03.3 0.12 38.7 36.8 2.1 96.54 d 8 1 04.5 0.17 58.7 70.1 2.0 96.55 d 12 1 04.5 0.17 60.2 70.1 2.2 97.36 8 1 04.5 0.17 28.2 22.7 0.3 99.67 8 2 06.2 0.23 78.1 62.9 0.8 99.28 8 3 08.3 0.31 89.8 72.3 1.3 98.69 e 8 4 12.4 0.46 45.5 36.2 0.0 99.910 8 4 12.4 0.46 98.8 75.8 2.0 97.911 8 4 12.4 0.28 97.2 126 2.1 97.912 8 4 12.4 0.20 82.7 151 1.6 98.313 8 4 12.4 0.15 73.3 187 1.1 98.814 8 4 12.4 0.12 61.3 213 1.3 98.6a: Reaction temperature: 250 o C, time: 1h, Ar: 30 ml/min,Steam/Carbon = 1.0b: Total weight of CuO and ZnO,c: W/F: catlyst weight(g) / feed methanol (mol/h)d: Reaction temperature: 300 o Ce: Reaction temperature: 200 o CReferences1. C. Cao, G. Xia, J. Holladay, E. Jones, and Y. Wang, Appl. Catal. A; Gen., 2004, 262, 19.2. A. Karim, J. Bravo, and A. Datye, Appl. Catal. A; Gen., 2005, 281, 101. .3. J.C. Genley, K.L. Riechmann, E.G. Seebauer, and R.I. Masel, J. Catal., 2004, 227, 26.4. H. Masuda and K. Fukuda, Science, 1995, 268, 1466.116