TPR and FTIR Study of Nitrided Molybdena‐Alumina Catalyst

Abstract

Nitrkled 11.7% and 97.1 % molybdena-alumina catalysts have been investigated using temperature-programmed reaction with hydrogen (TPR) and diffuse reflectance FTlR connected toa mass spectrometer with the aid of XRD analysis.From the TPR and XRD analyses, y-Mo2N was formed on the surface of the 1 1.7% and 97.1 % Mo/A1203 nitrided at 700°C.On the basis of the NH3-TPD and IR spectroscoples, much more Lewis acid sites than Bransted acid sites are present on the surface of the nitrided molybdena-alumina.

Surface Properties and Active Sites of Nitrided Mo/Al2O3 Catalysts for the Hydrodenitrogenation of Carbazole

“…In recent years, new types of catalyst, such as transition metal nitrides and oxynitrides [11][12][13][14] have been studied for hydrotreatment [15][16][17], HDS [18][19][20][21][22][23] and HDN [24][25][26][27][28][29][30][31][32][33][34]. Molybdenum nitrides with a high surface area have been extensively developed by the temperature-programmed nitridation of MoO 3 with ammonia [35][36][37][38][39] or N 2 ? H 2 [40][41][42] under conditions applying low heating rates, small precursor particle sizes and high space velocities.…”