Glycerol Waste Valorization to Mesoxalic Acid Over a Bimetallic Pt-Pd/CNT Catalyst in Alkaline Medium

Glycerol electro-oxidation offers a green route to produce the high value added chemicals. Here in, we report the glycerol electro-oxidation over a series of multi walled carbon nano tubes supported monometallic (Pt/CNT and Pd/CNT) and bimetallic (Pt-Pd/CNT) catalysts in alkaline medium. The cyclic voltammetry, linear sweep voltammetry and chronoamperometry measurements were used to evaluate the activity and stability of the catalysts. The Pt-Pd/CNT electrocatalyst exhibited the highest activity in terms of higher current density (129.25 A/m2) and electrochemical surface area (382 m2/g). The glycerol electro-oxidation products formed at a potential of 0.013 V were analyzed systematically by high performance liquid chromatography. Overall, six compounds were found including mesoxalic acid, 1,3-dihydroxyacetone, glyceraldehyde, glyceric acid, tartronic acid and oxalic acid. A highest mesoxalic acid selectivity of 86.42% was obtained for Pt-Pd/CNT catalyst while a maximum tartronic acid selectivity of 50.17% and 46.02% was achieved for Pd/CNT and Pt/CNT respectively. It was found that the introduction of Pd into Pt/CNT lattice facilitated the formation of C3 products in terms of maximum selectivity achieved (86.42%) while the monometallic catalysts (Pd/CNT and Pt/CNT) showed a poor performance in comparison to their counterpart.

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Facile synthesis of PdSb x /C nanocatalyst with high performance for ethanol electro-oxidation in alkaline medium

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2014.09.011 ◽

2014 ◽

Vol 39 (32) ◽

pp. 18256-18263 ◽

Cited By ~ 6

Author(s):

Jindi Cai ◽

Yiyin Huang ◽

Yonglang Guo

Keyword(s):

Alkaline Medium ◽

High Performance ◽

Facile Synthesis ◽

Electro Oxidation

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High-Performance Electrocatalytic Activity of Palladium-Copper Nanoalloy towards Methanol Electro-oxidation in an Alkaline Medium

Electroanalysis ◽

10.1002/elan.201600164 ◽

2016 ◽

Vol 29 (2) ◽

pp. 433-440 ◽

Cited By ~ 12

Author(s):

Subramanian Arulmani ◽

Sathiyan Krishnamoorthy ◽

Jerry J. Wu ◽

Sambandam Anandan

Keyword(s):

Alkaline Medium ◽

Electrocatalytic Activity ◽

High Performance ◽

Electro Oxidation

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Olive Fruit and Leaf Wastes as Bioactive Ingredients for Cosmetics—A Preliminary Study

Antioxidants ◽

10.3390/antiox10020245 ◽

2021 ◽

Vol 10 (2) ◽

pp. 245

Author(s):

María de la Luz Cádiz-Gurrea ◽

Diana Pinto ◽

Cristina Delerue-Matos ◽

Francisca Rodrigues

Keyword(s):

Olive Oil ◽

High Performance ◽

Value Added ◽

Bioactive Compound ◽

In Vitro Assays ◽

Oil Consumption ◽

Cosmetic Ingredients ◽

Bioactive Ingredients ◽

Olive Industry

Olea europaea cultivar, native in the Mediterranean basin, has expanded worldwide, mainly due to the olive oil industry. This expansion is attributed to the benefits of olive oil consumption, since this product is rich in nutritional and bioactive compounds. However, the olive industry generates high amounts of wastes, which could be related to polluting effects on soil and water. To minimize the environmental impact, different strategies of revalorization have been proposed. In this sense, the aim of this work was to develop high cosmetic value added oleuropein-enriched extracts (O20 and O30), a bioactive compound from olive byproducts, performing a comprehensive characterization using high performance liquid chromatography coupled to mass spectrometry and evaluate their bioactivity by in vitro assays. A total of 49 compounds were detected, with oleuropein and its derivatives widely found in O30 extract, whereas iridoids were mainly detected in O20 extract. Moreover, 10 compounds were detected for the first time in olive leaves. Both extracts demonstrated strong antioxidant and antiradical activities, although O30 showed higher values. In addition, radical oxygen and nitrogen species scavenging and enzyme inhibition values were higher in O30, with the exception of HOCl and hyaluronidase inhibition assays. Regarding cell viability, olive byproduct extracts did not lead to a decrease in keratinocytes viability until 100 µg/mL. All data reported by the present study reflect the potential of industrial byproducts as cosmetic ingredients.

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Gallium nitride catalyzed the direct hydrogenation of carbon dioxide to dimethyl ether as primary product

Nature Communications ◽

10.1038/s41467-021-22568-4 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Chang Liu ◽

Jincan Kang ◽

Zheng-Qing Huang ◽

Yong-Hong Song ◽

Yong-Shan Xiao ◽

...

Keyword(s):

Gallium Nitride ◽

Dimethyl Ether ◽

High Performance ◽

Density Functional ◽

Value Added ◽

Density Functional Theory Calculations ◽

Product Distribution ◽

Spectroscopic Studies ◽

Direct Hydrogenation ◽

Hydrogenation Of Co

AbstractThe selective hydrogenation of CO2 to value-added chemicals is attractive but still challenged by the high-performance catalyst. In this work, we report that gallium nitride (GaN) catalyzes the direct hydrogenation of CO2 to dimethyl ether (DME) with a CO-free selectivity of about 80%. The activity of GaN for the hydrogenation of CO2 is much higher than that for the hydrogenation of CO although the product distribution is very similar. The steady-state and transient experimental results, spectroscopic studies, and density functional theory calculations rigorously reveal that DME is produced as the primary product via the methyl and formate intermediates, which are formed over different planes of GaN with similar activation energies. This essentially differs from the traditional DME synthesis via the methanol intermediate over a hybrid catalyst. The present work offers a different catalyst capable of the direct hydrogenation of CO2 to DME and thus enriches the chemistry for CO2 transformations.

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Concentration Dependence of the Electro-oxidation of Ethanol and Ethylene Glycol at Platinum in Alkaline Medium

ECS Meeting Abstracts ◽

10.1149/ma2009-02/6/387 ◽

2009 ◽

Keyword(s):

Ethylene Glycol ◽

Concentration Dependence ◽

Alkaline Medium ◽

Electro Oxidation ◽

Oxidation Of Ethanol

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Fabrication of electrospun nickel sulphide nanoparticles onto carbon nanofibers for efficient urea electro-oxidation in alkaline medium

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2021.01.138 ◽

2021 ◽

Author(s):

R.M. Abdel Hameed ◽

Ibrahim M.A. Mohamed ◽

Abdullah M. Al-Enizi ◽

Ahmed Abutaleb ◽

Shoyebmohamad F. Shaikh ◽

...

Keyword(s):

Carbon Nanofibers ◽

Alkaline Medium ◽

Nickel Sulphide ◽

Electro Oxidation

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Investigating Lignin-Derived Monomers and Oligomers in Low-Molecular-Weight Fractions Separated from Depolymerized Black Liquor Retentate by Membrane Filtration

Molecules ◽

10.3390/molecules26102887 ◽

2021 ◽

Vol 26 (10) ◽

pp. 2887

Author(s):

Kena Li ◽

Jens Prothmann ◽

Margareta Sandahl ◽

Sara Blomberg ◽

Charlotta Turner ◽

...

Keyword(s):

Molecular Weight ◽

High Performance ◽

Membrane Filtration ◽

Black Liquor ◽

Complex Mixture ◽

Value Added ◽

Kraft Pulping ◽

Classification Model ◽

Low Molecular Weight ◽

Chemical Complexity

Base-catalyzed depolymerization of black liquor retentate (BLR) from the kraft pulping process, followed by ultrafiltration, has been suggested as a means of obtaining low-molecular-weight (LMW) compounds. The chemical complexity of BLR, which consists of a mixture of softwood and hardwood lignin that has undergone several kinds of treatment, leads to a complex mixture of LMW compounds, making the separation of components for the formation of value-added chemicals more difficult. Identifying the phenolic compounds in the LMW fractions obtained under different depolymerization conditions is essential for the upgrading process. In this study, a state-of-the-art nontargeted analysis method using ultra-high-performance supercritical fluid chromatography coupled to high-resolution multiple-stage tandem mass spectrometry (UHPSFC/HRMSn) combined with a Kendrick mass defect-based classification model was applied to analyze the monomers and oligomers in the LMW fractions separated from BLR samples depolymerized at 170–210 °C. The most common phenolic compound types were dimers, followed by monomers. A second round of depolymerization yielded low amounts of monomers and dimers, while a high number of trimers were formed, thought to be the result of repolymerization.

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