Abstract
Al-MCM mesoporous molecular sieves with Si/Al ratio in the range 10–40 were characterized by XRD, N 2 adsorption, MAS NMR, and DRIFT, and their acid properties were determined by pyridine (PY) adsorption. Aniline methylation was a pseudo-first-order process with respect to aniline concentration. N-methylation products were predominant with a selectivity of the 100 mol% at 573 K after two hours on stream. The aniline conversion and selectivity to NNDMA decreased whereas selectivity to NMA continuously increased with time on stream. Besides, the selectivity to NMA remained almost the same, irrespective of the aniline conversion, aluminum content, and acidity, this fact was strictly observed for Al-B-X catalysts. On the other hand, the re-used Al-MCM-41 catalysts would be described as amorphous aluminosilicates because of its structure deteriorate with reaction water.
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