Titanium-silica catalyst derived from defined metallic titanium cluster precursor: Synthesis and catalytic properties in selective oxidations
| Autor: | Rinaldo Psaro, Irina D. Ivanchikova, Alexandr N. Shmakov, Oxana A. Kholdeeva, Nataliya V. Maksimchuk, Matteo Guidotti, Cristina Tiozzo, Claudio Evangelisti |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Oxidative carboxylation
Inorganic chemistry chemistry.chemical_element 010402 general chemistry Molecular sieve Heterogeneous catalysis 01 natural sciences Styrene Catalysis law.invention Inorganic Chemistry chemistry.chemical_compound law Materials Chemistry Calcination Physical and Theoretical Chemistry chemistry.chemical_classification 010405 organic chemistry Alkene Titanium clusters Mesoporous silica 0104 chemical sciences chemistry Alkene epoxidation Titanium |
| Zdroj: | Inorganica Chimica Acta (Testo stamp.) 470 (2018): 393–401. doi:10.1016/j.ica.2017.06.059 info:cnr-pdr/source/autori:Evangelisti C.; Guidotti M.; Tiozzo C.; Psaro R.; Maksimchuk N.; Ivanchikova I.; Shmakov A.N.; Kholdeeva O./titolo:Titanium-silica catalyst derived from defined metallic titanium cluster precursor: Synthesis and catalytic properties in selective oxidations/doi:10.1016%2Fj.ica.2017.06.059/rivista:Inorganica Chimica Acta (Testo stamp.)/anno:2018/pagina_da:393/pagina_a:401/intervallo_pagine:393–401/volume:470 |
| DOI: | 10.1016/j.ica.2017.06.059 |
| Popis: | A class of titanium-grafted mesoporous silica catalysts has been designed and prepared starting from molecularly defined metal clusters. The organosol mixture of zerovalent Ti13 clusters was impregnated onto the surface of ordered mesoporous silica molecular sieves (MCM-41 and MMM-2) and, after high-temperature calcination, an evenly dispersed non-single-site Ti(IV)nOx-like silica-supported catalyst was obtained. The catalytic solids, fully characterized by microscopic, spectroscopic and porosimetric techniques, showed standard performance in the liquid-phase epoxidation of a cyclic alkene, as limonene, but remarkably high selectivity values in the oxidative carboxylation of styrene, with tert-butylhydroperoxide and carbon dioxide in the presence of tetrabutylammonium bromide as a cocatalyst. Unprecedented high yields, up to 67%, in styrene carbonate were achieved after 24 h, under solvent-free conditions. The catalysts displayed also a noteworthy stability of the performance to repeated recovery and reuse cycles. |
| Databáze: | OpenAIRE |
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