Synthesis and characterization of Au nanocatalyst on modifed bentonite and silica and their applications for solvent free oxidation of cyclohexene with molecular oxygen

Nejad, Mohaddesesh Shahabi; Ghasemi, Ghasem; Martı́nez-Huerta, M.V.; Ghiaci, Mehran

doi:10.1016/j.molcata.2015.05.026

Cited by 22 publications

(8 citation statements)

References 25 publications

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“…In our case, molecular oxygen is used as an oxidant (6 bars) and n-heptane as solvent (75 mL). However, at 80 º C one would expect that cyclohexene was in the liquid phase in the reaction conditions, and its contact with the catalyst [1,18]. It is demonstrated that titania does not show any activity in this reaction.…”

Section: Cyclohexene Oxidation By Molecular Oxygenmentioning

confidence: 94%

“…Also, it is noted that AuFeI shows an important activity close to 50 % after just 6 h of contact. M. Shahabi Nejad et al [18] were studied the cyclohexene oxidation by O2 using Au-modified-Bentonite (25 m 2 .g -1 ) and Au-modified-SiO2 (378 m 2 .g -1) as catalysts in a free solvent condition and varied the reaction time and oxidant pressure (O2). They have selected 8 h as the good duration for the oxidation reaction over silica-supported catalyst, and 10 h for Bentonite-supported catalyst.…”

Section: Cyclohexene Oxidation By Molecular Oxygenmentioning

confidence: 99%

“…They have selected 8 h as the good duration for the oxidation reaction over silica-supported catalyst, and 10 h for Bentonite-supported catalyst. They attributed this difference to the surface area; the catalyst Au-modified-SiO2 that have more surface area and consequently more than 14 probability to react with cyclohexene in a minimal period [18]. Concerning the O2 pressure, they varied it from 8, 10, 13 to 15 bars.…”

Section: Cyclohexene Oxidation By Molecular Oxygenmentioning

confidence: 99%

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Activity of Bimetallic Gold-Iron Catalysts in Adipic Acid Production by Direct Oxidation of Cyclohexene with Molecular Oxygen

Hakkoum¹,

Ameur²,

Bachir³

et al. 2019

ACSM

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This paper explores the properties of bimetallic catalysts based on gold and iron nanoparticles "Au-Fe/TiO2" and their application in the adipic acid production by direct oxidation of cyclohexene with molecular oxygen. The bimetallic materials were prepared with different amounts of gold and iron in two different methods: simultaneous deposition of Au and Fe using co-deposition precipitation with urea (Co-DPU), and deposition precipitation of gold followed by iron impregnation (DPU+IMP). The obtained catalysts were characterized by several techniques, such as XRD, RD/UV-Vis, ATR, ICP and BET. The properties of the catalysts prepared by different methods were compared, revealing that the metallic nanoparticles in the two methods differ in oxidation state, shape and size decrement. For cyclohexene oxidation by molecular oxygen, an important conversion of cyclohexene (≈50 %) was obtained just after 2h in the case of AuFeC was observed. In terms of selectivity, all catalysts showed an excellent adipic acid production up to 90 %. The research establishes a green chemistry route from direct oxidation of cyclohexene to adipic acid using bimetallic catalyst in one-step reaction.

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Section: Cyclohexene Oxidation By Molecular Oxygenmentioning

confidence: 94%

Section: Cyclohexene Oxidation By Molecular Oxygenmentioning

confidence: 99%

Section: Cyclohexene Oxidation By Molecular Oxygenmentioning

confidence: 99%

See 1 more Smart Citation

Activity of Bimetallic Gold-Iron Catalysts in Adipic Acid Production by Direct Oxidation of Cyclohexene with Molecular Oxygen

Hakkoum¹,

Ameur²,

Bachir³

et al. 2019

ACSM

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“…19,21 Oxidation of cyclohexene has also been investigated under solvent free conditions. [31][32][33][34] For example, using silica or manganese oxide supported gold catalysts, selectivity for production of epoxide (i.e., cyclohexene oxide) is generally lower than 10% when molecular oxygen was used. 31,32 In order to improve the selectivity for production of cyclohexene oxide, gold nanoclusters (i.e., Au 9 and Au 101 ) were anchored onto WO 3 nanoparticles 35 ; the selectivity for production of cyclohexene oxide on Au 101 /WO 3 catalyst was improved largely to 35% comparing to 7% of Au 101 /SiO 2 catalyst when molecular oxygen or peroxide is used as the oxidant.…”

Section: Introductionmentioning

confidence: 99%

Selective epoxidation of cyclohexene with molecular oxygen on catalyst of nanoporous Au integrated with MoO3 nanoparticles

Dou

Tao

2017

Applied Catalysis A: General

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Selective oxidation of olefins to desired products such as epoxides is highly demanded in chemical industry. It remains challenging to achieve high selectivity for production of epoxides over heterogeneous catalysts through using molecular oxygen as the oxidant. Nanoporous reverse catalysts (MoO 3 @np-Au) consisting of pure nanoporous gold (np-Au) and MoO 3 nanoparticles anchored on Au ligaments were synthesized for selective oxidation of cyclohexene with molecular oxygen. By controlling the loading of molybdenum and thermal treatment condition, MoO 3 nanoparticles with size of ~5 nm were uniformly anchored on the surface of gold ligaments (30-50 nm) of pure nanoporous gold (np-Au). These synthesized MoO 3 @np-Au catalysts exhibited high selectivity of 58%-73% for production of cyclohexene oxide at conversion of 4%-11% of cyclohexene by using molecular oxygen as the oxidant. Compared to MoO 3 @np-Au, the selectivity for the production of cyclohexene oxide on pure np-Au catalyst is only 6% under the same catalytic condition as that on MoO 3 @np-Au. The observed high selectivity for production of cyclohexene oxide on MoO 3 @np-Au can be rationalized with a bi-functional mechanism of a reverse metal/oxide catalyst. The in-situ formed surface molybdenum oxo-peroxo species are suggested to be responsible for selective oxidation of cyclohexene to cyclohexene oxide, while the MoO 3 /Au interface activates molecular oxygen to regenerate the molybdenum oxo-peroxo active centers.

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“…On the other hand, the supported transition metal or oxides were also employed as heterogeneous catalysts for the allylic oxidation of cyclohexene [6,[14][15][16][17][18][19][20]. Recently, Au nanoparticles supported on modified bentonite and silica gave a high conversion (92%) and an excellent selectivity (97%) to 2-cyclohexen-1-one in the aerobic oxidation of cyclohexene without solvent [21]. It was also reported that PdO/SBA-15 was an active catalyst for the oxidation of cyclohexene in acetonitrile, and a conversion of 56% and a selectivity of 82% to 2-cyclohexen-1-one were obtained [6].…”

Section: Introductionmentioning

confidence: 99%

Aerobic Catalytic Oxidation of Cyclohexene over TiZrCo Catalysts

et al. 2016

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Abstract:The aerobic oxidation of hydrocarbon is of great significance from the viewpoints of both fundamental and industry studies as it can transfer the petrochemical feedstock into valuable chemicals. In this work, we investigated the aerobic oxidation of cyclohexene over TiZrCo catalysts, in which 2-cyclohexen-1-one was produced with a high selectivity of 57.6% at a conversion of 92.2%, which are comparable to the best results reported for the aerobic oxidation of cyclohexene over heterogeneous catalysts. The influences of kinds of solvent, substrate concentration and reaction temperature were evaluated. Moreover, the catalytic performance of the TiZrCo catalyst and the main catalytic active species were also discussed. The results of SEM, XRD and XPS suggested that the surface CoO and Co 3 O 4 species are the catalytic active species and contribute to the high activity and selectivity in the present cyclohexene oxidation. The present catalytic system should have wide applications in the aerobic oxidation of hydrocarbons.

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Synthesis and characterization of Au nanocatalyst on modifed bentonite and silica and their applications for solvent free oxidation of cyclohexene with molecular oxygen

Cited by 22 publications

References 25 publications

Activity of Bimetallic Gold-Iron Catalysts in Adipic Acid Production by Direct Oxidation of Cyclohexene with Molecular Oxygen

Activity of Bimetallic Gold-Iron Catalysts in Adipic Acid Production by Direct Oxidation of Cyclohexene with Molecular Oxygen

Selective epoxidation of cyclohexene with molecular oxygen on catalyst of nanoporous Au integrated with MoO3 nanoparticles

Aerobic Catalytic Oxidation of Cyclohexene over TiZrCo Catalysts

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