authors |
Nunes, MS; Gomes, DM; Gomes, AC; Neves, P; Mendes, RF; Paz, FAA; Lopes, AD; Valente, AA; Goncalves, IS; Pillinger, M |
nationality |
International |
journal |
CATALYSTS |
author keywords |
molybdenum; molybdenum oxide; organic-inorganic hybrid material; tetrazole; 5-(2-pyridyl)tetrazole; hydrogen bonds; epoxidation; bio-olefins |
keywords |
EPOXIDIZED METHYL OLEATE; 5-SUBSTITUTED 1H-TETRAZOLES; HYDROTHERMAL SYNTHESIS; COORDINATION POLYMERS; TETRAZOLATO COMPLEXES; CRYSTAL-STRUCTURE; SCHIFF-BASES; ACID; LIMONENE; LIGANDS |
abstract |
There is a considerable practical interest in discovering new ways to obtain organomolybdenum heterogeneous catalysts for olefin epoxidation that are easier to recover and reuse and display enhanced productivity. In this study, the complex salt (H(2)pytz)[MoO2Cl2(pytz)] (1) (Hpytz = 5-(2-pyridyl)tetrazole) has been prepared, structurally characterized, and employed as a precursor for the hydrolysis-based synthesis of a microcrystalline molybdenum oxide/organic hybrid material formulated as [MoO3(Hpytz)] (2). In addition to single-crystal X-ray diffraction (for 1), compounds 1 and 2 were characterized by FT-IR and Raman spectroscopies, solid-state C-13{H-1} cross-polarization (CP) magic-angle spinning (MAS) NMR, and scanning electron microscopy (SEM). Compounds 1 and 2 were evaluated as olefin epoxidation catalysts using the model reaction of cis-cyclooctene (Cy8) with tert-butyl hydroperoxide (TBHP), at 70 & DEG;C, which gave 100% epoxide selectivity up to 100% conversion. While 1 behaved as a homogeneous catalyst, hybrid 2 behaved as a heterogeneous catalyst and could be recovered for recycling without showing structural degradation or loss of catalytic performance over consecutive reaction cycles. The substrate scope was broadened to monoterpene DL-limonene (Lim) and biobased unsaturated fatty acid methyl esters, methyl oleate (MeOle), and methyl linoleate (MeLin), which gave predominantly epoxide products. |
publisher |
MDPI |
isbn |
2073-4344 |
year published |
2021 |
volume |
11 |
issue |
11 |
digital object identifier (doi) |
10.3390/catal11111407 |
web of science category |
24 |
subject category |
Chemistry, Physical |
unique article identifier |
WOS:000724489800001
|
ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
3.52 |
5 year journal impact factor |
3.708 |
category normalized journal impact factor percentile |
59.434 |
dimensions (citation analysis):
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altmetrics (social interaction):
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