New palladium catalysts on polyketone prepared through different smart methodologies and their use in the hydrogenation of cinnamaldehyde

Galletti, A. M. Raspolli; Toniolo, Luigi; Antonetti, Claudia; Evangelisti, Claudio; Forte, Claudia

doi:10.1016/j.apcata.2012.09.003

Cited by 29 publications

(5 citation statements)

References 48 publications

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“…A possible mechanism was proposed that the coordination of CO with Lewis acid in MIL-101 enhanced the activity of CC hydrogenation and inhibited the further hydrogenation of CO . Pd-based catalysts exhibited a much higher activity for this selective hydrogenation reaction, and ionic liquids were used to further enhance the selectivity and activity. ,− Kume et al reported that the Pd NPs modified with [BMIm]PF 6 (Pd/SiO 2 –IL[PF6]) gave a HCAL yield of 100% with an activity twice that of Pd/SiO 2 . In addition, bimetallic catalysts, such as PtNi, , NiIr, PdNi, and PdAu, were developed to enhance the hydrogenation activity and HCAL selectivity.…”

Section: Selective Hydrogenation Of Ual To Salmentioning

confidence: 99%

Highly Selective Catalysts for the Hydrogenation of Unsaturated Aldehydes: A Review

2020

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The selective hydrogenation of unsaturated aldehydes (UAL) to saturated aldehydes (SAL) and unsaturated alcohols (UOL) is an important industrial process for producing fine chemicals. More efforts were made on the selective hydrogenation of CO to UOL, because CC hydrogenation is thermodynamically favored over CO hydrogenation. A crucial step toward high selectivity is the rational design of heterogeneous catalysts. In this Review, the catalyst design for the hydrogenation of UAL to UOL are catalogued into three major strategies, namely, modifying electronic properties, forming electrophilic sites, and involving confinement/steric effect. Research works accomplished in the past decade on the catalyst design for UAL hydrogenation are systematically reviewed using the above strategies. The focus is on the selectivity-enhancing mechanism, methods to perform the chosen strategy, and the factors that influence the mechanism. Density functional theory calculations and catalyst stability are discussed to appreciate the challenges in designing catalysts. In addition, recent advances in the selective hydrogenation of CC of cinnamaldehyde to hydrocinnamaldehyde are briefly reviewed.

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Section: Selective Hydrogenation Of Ual To Salmentioning

confidence: 99%

Highly Selective Catalysts for the Hydrogenation of Unsaturated Aldehydes: A Review

2020

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“…Furthermore, in the case of lignocellulosic biomass, the effect of MW irradiation at a molecular level leads to a physical disruption of the internal composition of cells, increasing the rate of mass transfer. The application of microwave heating is a fast growing research area, where high reaction rates and selectivity can be achieved together with a significant reduction of the reaction time (often by orders of magnitude) and of energy consumption [48,49,50,51]. In addition, reproducible experiments can be carried out, especially thanks to the use of “mono-mode” (also named “single-mode”) MW applicators.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Conversion of Giant Reed to Furfural and Levulinic Acid: Optimization of the Process under Microwave Irradiation and Investigation of Distinctive Agronomic Parameters

et al. 2015

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Abstract:The hydrothermal conversion of giant reed (Arundo donax L.) to furfural (FA) and levulinic acid (LA) was investigated in the presence of dilute hydrochloric acid. FA and LA yields were improved by univariate optimization of the main reaction parameters: concentration of the acid catalyst, solid/liquid ratio of the reaction mixture, hydrolysis temperature, and reaction time. The catalytic performances were investigated adopting the efficient microwave (MW) irradiation, allowing significant energy and time savings. The best FA and LA yields were further confirmed using a traditionally heated autoclave reactor, giving very high results, when compared with the literature. Hydrolysis temperature and time were the main reaction variables to be carefully optimized: FA formation needed milder reaction conditions, while LA more severe ones. The effect of the crop management (e.g., harvest time) on FA/LA production was discussed, revealing that harvest time was not a discriminating parameter for the further optimization of both FA and LA production, due to the very high productivity of the giant reed throughout the year. The promising results demonstrate that giant reed represents a very interesting candidate for a very high contemporary production of FA and LA of up to about 70% and 90% of the theoretical yields, respectively.

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“…Also microwave (MW) irradiation represents a reliable option to heat pretreatment systems, guaranteeing fast heating rates up to the process temperature with low energy inputs in comparison to those necessary with traditional heating systems [ 15 , 17 , 22 – 24 ].…”

Section: Introductionmentioning

confidence: 99%

Autohydrolysis pretreatment of Arundo donax: a comparison between microwave-assisted batch and fast heating rate flow-through reaction systems

Galia

Schiavo

Antonetti

et al. 2015

Biotechnol Biofuels

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BackgroundAutohydrolysis of lignocellulosic biomass in liquid hot water has been widely studied owing to its high efficiency and relatively low cost. In the perspective of industrial applications, continuous or semi-continuous processes are more interesting than batch systems. Moreover, microwave heating of pretreatment systems has been proposed to intensify the kinetics of the process. In this study, the autohydrolysis of Arundo donax was performed in pure liquid hot water using a microwave-heated batch reactor and a semi-continuous flow-through reaction system with fast heating rate at the same operating conditions with the aim of performing a systematic comparison between the two different experimental apparatuses.ResultsThe effect of process temperature and time, biomass to water mass to volume ratio and water flow rate on the concentration and yield of hydrolysis products was investigated. The flow-through set-up allowed us to reach biomass solubilization up to 44.5 wt% on dry basis, while the batch system stopped at 34.5 wt% suggesting that the mass transfer could be the rate-determining step in the solubilization of the constituting biopolymers. For example, in the flow-through layout, using a flow rate of 3.5 mL/min at 200 °C with 20 min of processing time, quantitative recovery of hemicellulose was obtained with limited formation of degradation products. Interestingly, higher cellulose/hemicellulose extraction ratios were found using the microwave-assisted batch reactor. FTIR analyses of the solid residues recovered after the pretreatment offered independent information on the fractions of liquefied biopolymers complementary to those derived from HPLC and UV–Vis spectroscopy.ConclusionsCollected experimental results indicated that the flow-through system can be adopted to obtain complete solubilization of the hemicellulose fraction of Arundo donax addressing the product distribution in soluble compounds towards fermentable sugars with limited formation of sugar degradation products and with limited penalty in terms of dilution of the hydrolysate solution. It was also found that microwaves can promote cellulose depolymerization and solubilization, thus allowing a more comprehensive utilization of the biomass and that infrared spectroscopy can be a useful technique to estimate the effect of the pretreatment.

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New palladium catalysts on polyketone prepared through different smart methodologies and their use in the hydrogenation of cinnamaldehyde

Cited by 29 publications

References 48 publications

Highly Selective Catalysts for the Hydrogenation of Unsaturated Aldehydes: A Review

Highly Selective Catalysts for the Hydrogenation of Unsaturated Aldehydes: A Review

Hydrothermal Conversion of Giant Reed to Furfural and Levulinic Acid: Optimization of the Process under Microwave Irradiation and Investigation of Distinctive Agronomic Parameters

Autohydrolysis pretreatment of Arundo donax: a comparison between microwave-assisted batch and fast heating rate flow-through reaction systems

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