The effect of sequence incorporation of sodium ions on structural and thermal properties of CoMo/Al2O3

Authors:

• Zenon Sarbak

Abstract

The alumina supported cobalt-molybdena catalysts containing sodium ions were subjected to X-ray diffraction studies, IR sprtroscopy and thermal analysis. Sodium ions were introduced onto Al₂O₃, either simultaneously with the other components, or prior to them or after them. Di- and potymolybdates phases were found to be formed on the support in all samples. In samples obtained in a two-stage process the interaction of Na⁺ ions with the support ions Was detected which did not occur in samples obtained in a single-stage process. Nitrate ions introduced simultaneously with the other components undergo a relatively strong thermal decomposition while in the samples synthesised in two stages they are strongly bounded. The greatest number of strongly bound nitrates was found in the sample into which sodium ions were introduced in the second stage of the preparation procedure.