Journal
CHEMSUSCHEM
Volume 13, Issue 18, Pages 5073-5079Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202001377
Keywords
acidity; glycerol dehydration; heterogeneous catalysis; metal-organic frameworks; post-synthetic modification
Funding
- National Natural Science Foundation of China [21733003, 21922103, 21961132003]
- National Key R&D Program of China [2018YFA0209401]
- Science & Technology Commission of Shanghai Municipality [17JC1400100]
- Australian Research Council Discovery Project [DP180104010]
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Metal-organic frameworks (MOFs) as solid acid catalysts provide active sites with definite structures. Here, Zr-6-based MOF-808 and its derivatives were studied as catalysts for glycerol dehydration, the products of which (acrolein vs. acetol) are very sensitive to the nature of the catalytic acid sites. Evolving MOF-808 into MOF-808-S with a 120 % increase in the number of Bronsted OH-/H2O coordinated to Zr(IV)and a vanished Lewis acidity by steam treatment, the post-synthetically modified catalyst presented 100 % conversion of glycerol, 91 % selectivity to acrolein, and 0 % selectivity to acetol within the active window. Real-time analysis of the product composition indicated the in situ MOF structural evolution. Overall, the specific MOF-substrate interaction characterized by the probe reaction provides more understandings on the structural evolution of the MOFs and their impact on the performance as solid acid catalysts.
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