Tandem Diels-Alder Reaction of Dimethylfuran and Ethylene and Dehydration to para -Xylene Catalyzed by Zeotypic Lewis Acids
- Univ. of Delaware, Newark, DE (United States). Catalysis Center for Energy Innovation (CCEI)
- Univ. of Massachusetts, Amherst, MA (United States); Univ. of Delaware, Newark, DE (United States). Catalysis Center for Energy Innovation (CCEI)
The zeotypic Lewis acids Sn-BEA, Zr-BEA, and Ti-BEA have recently been discussed to catalyze the synthesis of p-xylene by dehydrative aromatization of the Diels–Alder product between 2,5-dimethylfuran and ethylene. While it has been shown that these Lewis acids can catalyze the dehydration of the Diels–Alder cycloadduct, the tandem scheme precludes decoupling of the two steps needed to infer whether these same catalysts can catalyze the Diels–Alder step. We have employed electronic structure calculations and microkinetic modelling to investigate the Diels–Alder aromatization of 2,5-dimethylfuran and ethylene to p-xylene over the Lewis-acidic zeotypes Sn-, Zr-, and Ti-BEA. We show that there is only minor catalysis of the Diels–Alder reaction, solely attributable to confinement phenomena varying with the translational freedom allowed to the species inside the zeolite. Microkinetic modelling and sensitivity analysis of the computed rates show that the heterogeneous Diels–Alder pathway does not contribute to the overall rate, and that the homogeneous cycloaddition is rate-limiting at high acid site concentrations. Only the partially hydrolyzed (“open”) Lewis acid sites are found to be catalytically active, with moderately Brønsted-acidic silanol groups formed, which catalyze 2,5-dimethylfuran hydrolysis. Of the Lewis acids tested in this work, Zr-BEA and Sn-BEA have similar activities, in agreement with experiment, whereas Ti-BEA is found to be inactive, indicating that the recently reported Ti-BEA activity was likely a result of Brønsted-acidic defect sites.
- Research Organization:
- Energy Frontier Research Center (EFRC) Catalysis Center for Energy Innovation (CCEI); Univ. of Delaware, Newark, DE (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001004
- OSTI ID:
- 1469842
- Alternate ID(s):
- OSTI ID: 1400826
- Journal Information:
- ChemCatChem, Journal Name: ChemCatChem Journal Issue: 13 Vol. 9; ISSN 1867-3880
- Publisher:
- ChemPubSoc EuropeCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Mechanistic Insight into the [4 + 2] Diels–Alder Cycloaddition over First Row d-Block Cation-Exchanged Faujasites
|
journal | November 2018 |
Heterogeneous Diels–Alder catalysis for biomass-derived aromatic compounds
|
journal | January 2017 |
Formaldehyde–isobutene Prins condensation over MFI-type zeolites
|
journal | January 2018 |
Ultrafast flow chemistry for the acid-catalyzed conversion of fructose
|
journal | January 2019 |
Similar Records
Lewis acid zeolites for tandem Diels–Alder cycloaddition and dehydration of biomass-derived dimethylfuran and ethylene to renewable p-xylene
Computational Study of p-Xylene Synthesis from Ethylene and 2,5-Dimethylfuran Catalyzed by H-BEA
Journal Article
·
Mon Oct 26 20:00:00 EDT 2015
· Green Chemistry
·
OSTI ID:1387601
Computational Study of p-Xylene Synthesis from Ethylene and 2,5-Dimethylfuran Catalyzed by H-BEA
Journal Article
·
Tue Aug 26 00:00:00 EDT 2014
· Journal of Physical Chemistry. C
·
OSTI ID:1571022