کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
61758 | 47604 | 2011 | 7 صفحه PDF | دانلود رایگان |
Aluminum was incorporated into the layered silicate RUB-39, which is transformed by calcination into RUB-41. This new zeolite with RRO topology contains 8- and 10-ring pores, and the acid sites in the aluminated material catalyze the synthesis of methylamines, in particular mono- and dimethylamine, by amination of methanol. Owing to the shape-selective catalytic properties of (H)Al-RUB-41, low selectivity to the thermodynamically favored trimethylamine product is obtained in comparison with results on RUB-39 or non-shape-selective materials. Both activity and selectivity are highest for RUB-41 catalysts with a high Si to Al ratio. Silylation reduces the number of unselective sites and results in a further suppression of trimethylamine formation. The introduction of acidity in the intact RUB-41 structure is supported by Al-MAS NMR and NH3-TPD data. Additional characterization by XRD and SEM is provided.
Shape-selective amination of methanol over Al-RUB-41 with selectivities up to 87% towards monomethylamine and dimethylamine.Figure optionsDownload high-quality image (137 K)Download as PowerPoint slideResearch highlights
► Aluminum was incorporated into the layered silicate precursor of RUB-41.
► (H)Al-RUB-41 is a shape-selective catalyst for the methylamine synthesis.
► Highest activity and selectivity are attained at high Si/Al ratios.
► Silylation resulted in an increase in selectivity toward MMA and DMA.
Journal: Journal of Catalysis - Volume 278, Issue 2, 7 March 2011, Pages 246–252