Carbon deposition in methane reforming with carbon dioxide
- 219 Downloads
Coke formation in the dry reforming of methane was studied using a thermobalance (TG) and with a catalytic microreactor in the temperature range 800–950 K. Silica-supported and lanthana-supported nickel catalysts were examined. The effects of process variables such as temperature and gas composition (He dilution, CH4/CO2 ratio) on the coke formation rate were determined. The reactivity of H2 on several kinds of carbon was also investigated. The morphology of the coke was studied by scanning electron microscopy (SEM). The induction times for coke formation were significantly affected by temperature and by the CO content in the feed gas. The results of catalytic tests were consistent with the TG measurements. The behaviour of SiO2 and La2O3 supported Ni catalysts agree with a mechanism in which the lanthana support plays an important role in the carbon deposition.
Keywordscarbon deposition dry reforming Ni catalysts
Unable to display preview. Download preview PDF.
- 3.S. Teuncr, Hyd. Proc., 64 (1985) 106.Google Scholar
- 6.P. Gronchi, C. Mazzocchia, E. Tempesti and R. Del Rosso, “Environmental Catalysis”, G. Centi et al. (Editors), SCI Publ., Roma, 1995, p. 627.Google Scholar
- 7.P. Gronchi, D. Fumagalli, R. Del Rosso and P. Céntola, AIDIC Conf. Series, Vol. 1, I. Pasquon et al. (Editors), Eris, Milano 1995, 277–284.Google Scholar
- 8.J. R. Rostrup-Nielsen, “Steam Reforming Catalysts”, Danish Technical Press, Copenhagen 1975, p. 155.Google Scholar