A hybrid polyketone–SiO2 support for palladium catalysts and their applications in cinnamaldehyde hydrogenation and in 1-phenylethanol oxidation

Antonetti, Claudia; Toniolo, Luigi; Cavinato, G.; Forte, Claudia; Ghignoli, Chiara; Ishak, Randa; Cavani, Fabrizio; Galletti, Anna Maria Raspolli

doi:10.1016/j.apcata.2015.01.045

Cited by 15 publications

(7 citation statements)

References 55 publications

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“…This is one of the highest activities for reported heterogeneoush ydrogenation catalysts, such as Pd@TNT, [35] Pd-NMC, [36] PdWN/ SBA-15, [37] and so on. [38][39][40][41][42][43] This result indicated that the morphologye ffect of the La 2 O 2 CO 3 support can modify the reaction rate of CAL hydrogenation.…”

Section: Resultsmentioning

confidence: 93%

Pd Nanoparticles Supported on Triangle‐Shaped La₂O₂CO₃ Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Wang

et al. 2020

Chemistry A European J

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A catalyst in which Pd nanoparticles are supported on triangle‐shaped La2O2CO3 nanosheets exposing predominantly the (001) planes (Pd/La2O2CO3‐TNS; where TNS denotes triangular nanosheets) was prepared by a facile solvothermal method. The Pd/La2O2CO3‐TNS catalysts exhibited excellent catalytic activity and recycling stability for hydrogenation of cinnamaldehyde to hydrocinnamaldehyde with turnover frequency of up to 41 238 h−1. This enhanced activity of Pd/La2O2CO3‐TNS results from strong metal–support interactions. Structure analysis and characterization demonstrated that surface‐oxygen‐enriched La2O2CO3‐TNS supports exposing (001) planes are beneficial to charge transfer between the Pd nanoparticles and triangle‐shaped La2O2CO3 nanosheets and increase the electron density of Pd. Moreover, the modulated electronic states of the Pd/La2O2CO3‐TNS catalysts can enhance the adsorption and activation of hydrogen to enhance the hydrogenation activity.

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Section: Resultsmentioning

confidence: 93%

Pd Nanoparticles Supported on Triangle‐Shaped La₂O₂CO₃ Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Wang

et al. 2020

Chemistry A European J

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“…Regarding the chemical hydrolysis, the whole solid residue recovered at the end of the first step, containing embedded Amberlyst-70, was directly reprocessed under more Moreover, this resin was already successfully employed by us in a previous research, where it was adopted as the acid catalyst for the conversion of fructose and inulin to HMF in water in the presence of microwave heating, resulting in an active and recyclable system [57]. From the perspective of the sustainability of the reaction, microwaves (MW) represent an important tool because they can reduce the reaction time and the energy consumption, thus improving the efficiency of the processes [58][59][60][61][62]. Moreover, MW play the key role of selectively breaking the hydrogen bonds during the biomass conversion, decreasing the stability of the lignocellulosic matrix [11,63].…”

Section: Introductionmentioning

confidence: 99%

Multi-Step Exploitation of Raw Arundo donax L. for the Selective Synthesis of Second-Generation Sugars by Chemical and Biological Route

et al. 2020

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Lignocellulosic biomass represents one of the most important feedstocks for future biorefineries, being a precursor of valuable bio-products, obtainable through both chemical and biological conversion routes. Lignocellulosic biomass has a complex matrix, which requires the careful development of multi-step approaches for its complete exploitation to value-added compounds. Based on this perspective, the present work focuses on the valorization of hemicellulose and cellulose fractionsof giant reed (Arundo donax L.) to give second-generation sugars, minimizing the formation of reaction by-products. The conversion of hemicellulose to xylose was undertaken in the presence of the heterogeneous acid catalyst Amberlyst-70 under microwave irradiation. The effect of the main reaction parameters, such as temperature, reaction time, catalyst, and biomass loadings on sugars yield was studied, developing a high gravity approach. Under the optimised reaction conditions (17 wt% Arundo donax L. loading, 160 °C, Amberlyst-70/Arundo donax L. weight ratio 0.2 wt/wt), the xylose yield was 96.3 mol%. In the second step, the cellulose-rich solid residue was exploited through the chemical or enzymatic route, obtaining glucose yields of 32.5 and 56.2 mol%, respectively. This work proves the efficiency of this innovative combination of chemical and biological catalytic approaches, for the selective conversion of hemicellulose and cellulose fractions of Arundo donax L. to versatile platform products.

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“…When heterogeneous base metals catalysts were used, selective oxidation of 1-phenylethanol at room temperature was possible, however, a large catalyst load and a long reaction time up to 24 h were required [13]. Catalysts based on palladium, silver, and ruthenium, exceeded the activity of previous catalyst systems, as expected, and were not deactivated during the recycling tests [16,17]. However, the disadvantages in the case of silver and palladium catalysts would include the formation of by-products [16,18,19], and a high ratio of ruthenium to alcohol needed when using ruthenium catalysts [20].…”

Section: Introductionmentioning

confidence: 84%

Supported Gold Nanoparticles as Catalysts in Peroxidative and Aerobic Oxidation of 1-Phenylethanol under Mild Conditions

et al. 2020

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The efficiency of Au/TiO2 based catalysts in 1-phenylethanol oxidation was investigated. The role of support modifiers (La2O3 or CeO2), influence of gold loading (0.5% or 4%) and redox pretreatment atmosphere, catalyst recyclability, effect of oxidant: tert-butyl hydroperoxide (TBHP) or O2, as well as the optimization of experimental parameters of the reaction conditions in the oxidation of this alcohol were studied and compared with previous studies on 1-octanol oxidation. Samples were characterized by temperature-programmed oxygen desorption (O2-TPD) method. X-ray photoelectron spectroscopy (XPS) measurements were carried out for used catalysts to find out the reason for deactivation in 1-phenylethanol oxidation. The best catalytic characteristics were shown by catalysts modified with La2O3, regardless of the alcohol and the type of oxidant. When O2 was used, the catalysts with 0.5% Au, after oxidative pretreatment, showed the highest activity in both reactions. The most active catalysts in 1-phenylethanol oxidation with TBHP were those with 4% Au and the H2 treatment, while under the same reaction conditions, 0.5% Au and O2 treatment were beneficial in 1-octanol oxidation. Despite the different chemical nature of the substrates, it seems likely that Au+(Auδ+) act as the active sites in both oxidative reactions. Density functional theory (DFT) simulations confirmed that the gold cationic sites play an essential role in 1-phenylethanol adsorption.

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A hybrid polyketone–SiO2 support for palladium catalysts and their applications in cinnamaldehyde hydrogenation and in 1-phenylethanol oxidation

Cited by 15 publications

References 55 publications

Pd Nanoparticles Supported on Triangle‐Shaped La₂O₂CO₃ Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Pd Nanoparticles Supported on Triangle‐Shaped La₂O₂CO₃ Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Multi-Step Exploitation of Raw Arundo donax L. for the Selective Synthesis of Second-Generation Sugars by Chemical and Biological Route

Supported Gold Nanoparticles as Catalysts in Peroxidative and Aerobic Oxidation of 1-Phenylethanol under Mild Conditions

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A hybrid polyketone–SiO2 support for palladium catalysts and their applications in cinnamaldehyde hydrogenation and in 1-phenylethanol oxidation

Cited by 15 publications

References 55 publications

Pd Nanoparticles Supported on Triangle‐Shaped La2O2CO3 Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Pd Nanoparticles Supported on Triangle‐Shaped La2O2CO3 Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Multi-Step Exploitation of Raw Arundo donax L. for the Selective Synthesis of Second-Generation Sugars by Chemical and Biological Route

Supported Gold Nanoparticles as Catalysts in Peroxidative and Aerobic Oxidation of 1-Phenylethanol under Mild Conditions

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Pd Nanoparticles Supported on Triangle‐Shaped La₂O₂CO₃ Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Pd Nanoparticles Supported on Triangle‐Shaped La₂O₂CO₃ Nanosheets: A New Highly Efficient and Durable Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde