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Transition metal containing zeolites and mesoporous MCM-41 as heterogeneous catalysts for the N-alkylation of 2,4-diaminotoluene with dimethylcarbonate

Paper ID Volume ID Publish Year Pages File Format Full-Text
52933 46892 2009 5 PDF Available
Title
Transition metal containing zeolites and mesoporous MCM-41 as heterogeneous catalysts for the N-alkylation of 2,4-diaminotoluene with dimethylcarbonate
Abstract

Two series of catalysts, either zeolites exchanged with transition metal ions (Zn2+, Pb2+ and Sc3+) or mesoporous aluminosilicates containing Lewis acid sites introduced by ion exchange (Zn2+) or forming part of the framework (SnIV, TiIV and ZrIV) have been tested for the reaction of 2,4-diaminotoluene with dimethylcarbonate. The predominant products were those arising from N-methylation, although hard Lewis acid sites (Sc3+ in zeolite Y) and mesoporous catalysts also lead to N-carbamoylation in a significant extent (over 50% for Sc in zeolite Y or Zr in MCM-41 framework). This has been explained as result of the influence of the hardness/softness and the dimensions of the reaction cavity on the reaction selectivity. Overall, these heterogeneous catalysts were more active than NaY that is the zeolite previously studied in the literature for the same process. This enhanced efficiency of transition metal containing aluminosilicates is the consequence of the presence of stronger acid sites compared to Na+.

Keywords
Green chemistry; Heterogeneous catalysis; Zeolites as catalysts; Dimethyl carbonate
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Transition metal containing zeolites and mesoporous MCM-41 as heterogeneous catalysts for the N-alkylation of 2,4-diaminotoluene with dimethylcarbonate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 5, 25 January 2009, Pages 472–476
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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