The influence of the acid sites on the methylamines synthesis with Cu-HZSM-5 zeolite

• Published in: Catalysis letters Vol. 97; no. 1-2; pp. 1 - 8
• Main Authors: DE OLIVEIRA NUNES, Maria Helena, TEIXEIRA DA SILVA, Victor, SCHMAL, Martin
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01-08-2004; Springer Nature B.V
• Subjects: Amines; Catalysis; Catalysts; Chemistry; Copper; Exact sciences and technology; General and physical chemistry; Lewis acid; Selectivity; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Zeolites; Heterogeneous catalysis; Methylamine; Amine; Synthesis; Acidic site; Zeolite; methylamines synthesis; Molecular sieve; Cu-HZSM-5 zeolite; acid sites
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1023/B:CATL.0000034282.36256.b4

There is a high industrial demand for MMA and DMA, however, the production of TMA is favored with the commercial catalysts. This work tested the methanol amination reaction with HZSM-5 and Cu/HZSM-5 zeolites (%Cu = 1.2, 3.7 and 6.0). Regarding the MMA selectivity, light differences were observed among Cu/HZSM-5 catalysts and pure zeolite, although the catalysts containing 3.7% copper was slightly more selective to MMA than the other metallic catalysts studied. From these results it is suggested that the metal loading present in the catalysts leads to a modification in the nature of the acidic sites, in particular, the selectivity depends on ratio Brönsted/Lewis acid sites. This modifications would facilitate the amines desorption during the reaction.