Abstract
The paper reports results of studies in the effects of the conditions of calcination (673, 773, 873, 973 K) and reduction (773, 973 K) on the phase composition of catalysts for hydrocarbon steam reforming and on their resistance to coking. The catalysts examined (coprecipitated-mixed) were systems of the Ni/MgO-NiO-Al 2O 3 type (reduction degree NiO <= 50%). X-ray analysis revealed the presence in the catalysts of several crystallographic phases: the phase of solid solution NiO-MgO (rich in NiO), facilitated coking, while the phase of solid solution MgO-NiO (rich in MgO), and the MgO phase, both inhibiting coking. The existence of a dependence between the coking rate and the ratio of advantageous and disadvantageous phase contents in the catalysts examined is demonstrated. An interpretation of the results obtained is suggested as well as a preparation method for catalysts for steam reforming of higher hydrocarbons which ensures high coking resistance. X-ray analysis revealed the absence of the phase of solid solution NiO-MgO in the catalyst thus prepared.
Published Version
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