Abstract
This chapter presents the physicochemical characterization and catalytic activity of aluminium (Al)-HMS for N-methylation of aniline. Al-HMS mesoporous molecular sieves with silicon (Si)/Al ratio in the range 10–40 are synthesized by using dodecylamine as template. They are characterized by X-ray diffraction (XRD), N 2 adsorption, and magic angle spinning nuclear magnetic resonance (MAS NMR), and their acid properties are determined by pyridine (PY) adsorption. Aniline methylation is a pseudo-first-order process with respect to aniline concentration. Alkylation is a sequential reaction process in which the methylation of aniline produces N-methylaniline (NMA), then N,N-dimethylaniline (NNDMA) and subsequently N,N-dimethyltoluidines (NNDMT). N-methylation products (NMA+NNDMA) are predominant with a selectivity over 97 mol% at 573 K.
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