Epoxidation catalysts derived from aluminium and gallium dawsonites

Stoica, Georgiana; Santiago, Marta; Jacobs, Pierre; Pérez‐Ramírez, Javier; Pescarmona, Paolo P.

doi:10.1016/j.apcata.2009.09.021

Cited by 32 publications

(27 citation statements)

References 31 publications

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“…The good catalytic activity of these titanosilicate beads in the epoxidation of cyclohexene with H 2 O 2 is highly relevant in the context of a sustainable process because H 2 O 2 is considered a clean and environmentally friendly oxidant. [43][44][45][46] TiSil-HPB-60 is also a stable catalyst that can be used in repeated cycles with both TBHP and H 2 O 2 without significant loss of activity. No titanium leaching was observed during the epoxidation.…”

Section: Resultsmentioning

confidence: 99%

Titanosilicate Beads with Hierarchical Porosity: Synthesis and Application as Epoxidation Catalysts

Lin

Lebedev

Tendeloo

et al. 2010

Chemistry A European J

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Porous titanosilicate beads with a diameter of 0.5-1.5 mm (TiSil-HPB-60) were synthesized from a preformed titanosilicate solution with a porous anion-exchange resin as template. The bead format of this material enables its straightforward separation from the reaction mixture in its application as a liquid-phase heterogeneous catalyst. The material displays hierarchical porosity (micro/mesopores) and incipient TS-1 structure building units. The titanium species are predominantly located in tetrahedral framework positions. TiSil-HPB-60 is a highly active catalyst for the epoxidation of cyclohexene with t-butyl hydroperoxide (TBHP) and aqueous H(2)O(2). With both oxidants, TiSil-HPB-60 gave higher epoxide yields than Ti-MCM-41 and TS-1. The improved catalytic performance of TiSil-HPB-60 is mainly ascribed to the large mesopores favoring the diffusion of reagents and products to and from the titanium active sites. The epoxide yield and selectivity could be further improved by silylation of the titanosilicate beads. Importantly, TiSil-HPB-60 is a stable catalyst immune to titanium leaching, and can be easily recovered and reused in successive catalytic cycles without significant loss of activity. Moreover, TiSil-HPB-60 is active and selective in the epoxidation of a wide range of bulky alkenes.

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Section: Resultsmentioning

confidence: 99%

Titanosilicate Beads with Hierarchical Porosity: Synthesis and Application as Epoxidation Catalysts

Lin

Lebedev

Tendeloo

et al. 2010

Chemistry A European J

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“…Previously reported homogeneous and heterogeneous aluminum(III) and gallium(III) catalysts for these reactions have been reported to turn over up to ∼50 times. [13][14][15]17 The most successful of these alkene epoxidations were run at a relatively high temperature (80°C) and required 4−5 h to reach this level of activity. 14,15 In contrast, the turnover number of 87 for the best cyclooctene epoxidation in Table 1 was measured at 1 h and corresponded to reactions run at 0°C.…”

mentioning

confidence: 99%

“…20−22 To the best of our knowledge, this is the first instance of a gallium(III) compound serving as a homogeneous catalyst in alkene epoxidation (Scheme 1), although this metal ion has previously been a component in heterogeneous catalysts for such reactions. 14,17 The [Ga(phen) 2 Cl 2 ]Cl complex was crystallized from ethanol ( Figure 1). The structural data confirm the compositions of the inner and outer spheres, with the outersphere chloride located 5.57 Å away from the Ga III ion.…”

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A Homogeneous Gallium(III) Compound Selectively Catalyzes the Epoxidation of Alkenes

2012

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“…54-0910), which first turned amorphous on calcination at 200°C and then started converting to Ga 2 O 3 at about 250°C. [25] During phase transition from rhombohedral α-Ga 2 O 3 to monoclinic β-Ga 2 O 3 , the calculated crystal volume is expanded by 8. after the deposition of gold nanoparticles were similar and indicate that the presence of gold does not alter the structures of the two supports (see parts a in Figures 6 and 7). 01-074-1610) and monoclinic Ga 2 O 3 (JCPDS no.…”

Section: (A) Gold Nanoparticles On Gallium Oxidementioning

confidence: 99%

A Single Source Precursor Route to Group 13 Homo‐ and Heterometallic Oxides as Highly Active Supports for Gold‐Catalyzed Aerobic Epoxidation of trans‐Stilbene

et al. 2012

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A new Mitsubishi-type of star-shaped homoleptic derivative of indium(III), In 4 (mdea) 6 (2, mdeaH 2 = N-methyldiethanolamine), was synthesized by the chloro-aminoalkoxo exchange reaction of a heteroleptic complex In 6 Cl 6 (mdea) 6 (1) and used as a facile single source molecular precursor for the sol-gel preparation of high surface area indium oxide. Successful deposition of gold nanoparticles (1 wt.-%) of average size 3.3 nm on the above metal oxide by using HAuCl 4 ·3H 2 O afforded a highly efficient Au/In 2 O 3 catalyst for the aerobic epoxidation of trans-stilbene at low temperature. The above single source precursor approach was further [a]

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Epoxidation catalysts derived from aluminium and gallium dawsonites

Cited by 32 publications

References 31 publications

Titanosilicate Beads with Hierarchical Porosity: Synthesis and Application as Epoxidation Catalysts

Titanosilicate Beads with Hierarchical Porosity: Synthesis and Application as Epoxidation Catalysts

A Homogeneous Gallium(III) Compound Selectively Catalyzes the Epoxidation of Alkenes

A Single Source Precursor Route to Group 13 Homo‐ and Heterometallic Oxides as Highly Active Supports for Gold‐Catalyzed Aerobic Epoxidation of trans‐Stilbene

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