Glycerol hydrodeoxygenation to 1,2-propanediol catalyzed by CuPd/TiO2-Na

Ardila, Alba N.; Sánchez-Castillo, Marco A.; Zepeda, T.A.; Villa, Aída Luz; Fuentes, Gustavo A.

doi:10.1016/j.apcatb.2017.08.006

Cited by 36 publications

(41 citation statements)

References 56 publications

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“…The initial TOF (based on Cu + Pd sites) was 0.14 s –1 ; the selectivity to 1,2-PDO reached 85%. 1 The good activity and selectivity of these catalysts involves a synergistic effect between the two metallic components, that is, the activity of the bimetallic catalyst is larger than the sum of the effects for the two separate monometallic catalysts. The active sites were stable, as evidenced by the 5Cu5Pd5Na-F catalyst that maintained high stable activity and high 1,2-PDO selectivity after being reused three times.…”

Section: Resultsmentioning

confidence: 99%

“…In order to determine whether there were changes in the CuPd catalyst during its use, we analyzed the structure of a fresh bimetallic catalyst (5Cu5Pd5Na-F), that of a catalyst reused after simple filtering, water rinsing, and lixiviation with water prior to reaction, 1 which suffered a 10-fold decrease in Na content during synthesis (5Cu5Pd5Na-W), and that of a catalyst reused three times (5Cu5Pd5Na-R3). In the last case, the catalyst was filtered and washed with deionized water after each use and placed again in the reactor for a new run.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…The details about the preparation and pretreatment of the materials are described in our previous report, 1 as well as H 2 (H 2 -TPR), CO and H 2 chemisorption, N 2 O oxidation and H 2 titration, HRTEM, XRD, DRS-UV–vis, and EDSA results.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…Recently, we reported the transformation of glycerol by liquid phase hydrogenolysis into 1,2-PDO with high selectivity over CuPd/TiO 2 –Na bimetallic catalysts that have good stability at low hydrogen pressure in a batch system. 1 …”

Section: Introductionmentioning

confidence: 99%

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Nature and Distribution of Cu and Pd Species in CuPd/TiO₂–Na Bimetallic Catalysts for Glycerol Hydrodeoxygenation

2020

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We demonstrated recently that CuPd/TiO 2 –Na bimetallic catalysts synthesized by sequential wet impregnation are active, selective, and stable for the hydrodeoxygenation (HDO) of glycerol into propylene glycol at low H 2 pressure. The present study reports on the nature and distribution of Cu and Pd surface species in CuPd/TiO 2 –Na bimetallic catalysts using different scanning transmission electron microscopy techniques that supply cluster-specific alloying details. In particular, we used atomic-resolution Z -contrast imaging, X-ray energy-dispersive spectroscopy, and electron energy-loss spectroscopy. We also include X-ray photoelectron spectroscopy results. Our analysis shows that the metallic nanoparticles adopt mainly five different structures according to how the Cu and Pd atoms coordinate among themselves: a homogeneous CuPd alloy structure (45–61%), a Cu shell/CuPd core (15–23%), a smaller number of particles formed by Cu on the surface and Pd in the nucleus (10–17%), and there are also nanoparticles formed only by Pd (4–7%) or by Cu (8–13%). We determined that there is a inhomogeneous distribution of Cu and Pd in the bimetallic nanoparticles, with Cu being predominant on the surface (between 76 and 90% of the total area analyzed for each particle). Most bimetallic nanoparticles have sizes below 6 nm, the Pd monometallic nanoparticles are in the 2–4 nm range, whereas the monometallic Cu nanoparticles are larger than 8 nm. Bimetallic nanoparticles with sizes smaller than 6–7 nm are fundamentally made up of Cu 0 –Pd 0 and Cu 1+ –Pd 0 . The nanoparticles with sizes greater than 7 nm consist of Cu 2+ and Cu 2+ –Pd 2+ . Our obtained results also help describe reports about the activation of HDO by Pd–Cu in the absence of H 2 , an effect apparently not observed with other bimetallic systems.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nature and Distribution of Cu and Pd Species in CuPd/TiO₂–Na Bimetallic Catalysts for Glycerol Hydrodeoxygenation

2020

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“…This mild operating condition makes electrochemical con version differs from the thermochemical process. For instance, about 220°C is required to achieve 85% selectivity of 1,2 propanediol for hydrodeoxygenation reaction while~86% selectiv ity of 1,2 propanediol is achievable at 80°C using the electrochem ical technique (Ardila et al, 2017;Lee et al, 2018). The electrochemical process involves two half reactions (reduction and oxidation), which enables the independent optimization of each reaction (Orella et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

A review of recent developments on kinetics parameters for glycerol electrochemical conversion – A by-product of biodiesel

Rahim

Lee

Abnisa

et al. 2020

Science of The Total Environment

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Solilltkln \'•rilobb Cam:crcritlo.molsl>vcrol Céll\Cefll'll.ioncild«trol)'II: pllor'"'tloemtJI) / I! a Glycerol is a by product produced from biodiesel, fatty acid, soap and bioethanol industries. Today, the value of glycerol is decreasing in the global market due to glycerol surplus, which primarily resulted from the speedy expansion of biodiesel producers around the world. Numerous studies have proposed ways of managing and treating glycerol, as well as converting it into value added compounds. The electrochem ical conversion method is preferred for this transformation due to its simplicity and hence, it is discussed in detail. Additionally, the factors that could affect the process mechanisms and products distribution in the electrochemical process, including electrodes materials, pH of electrolyte, applied potential, current density, temperature and additives are also thoroughly explained. Value added compounds that can be produced from the electrochemical conversion of glycerol include glyceraldehyde, dihydroxyacetone, gly colic acid, glyceric acid, lactic acid, 1 :i. propanediol, 1,3 propanediol, tartronic acid and mesoxalic acid. These compounds are found to have broad applications in cosmetics, pharmaceutical, food and polymer industries are also described. This review will be devoted to a comprehensive overview of the current sce nario in the glycerol electrochemical conversion, the factors affecting the mechanism pathways, reaction rates, product selectivity and yield. Possible outcomes obtained from the process and their benefits to the industries are discussed. The utilization of solid acid catalysts as additives for future studies is also suggested

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An intrinsic kinetic model for liquid‐phase photocatalytic hydrogen production

2019

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A kinetic study was accomplished to describe the photocatalytic production of hydrogen in liquid phase. A reaction mechanism and a kinetic model were proposed to predict the rate of hydrogen production, which is a function of light intensity, catalyst loading, substrate concentration, and time. To assess the capability of the proposed model, glycerol and ethanol were selected as representative hydrogen sources (substrates). The experimental data performed under different operating conditions, based on Box-Behnken experimental design, were used to train the developed kinetic model, optimize the parameters using genetic algorithms and check its accuracy. The analysis confirms the validity of the model under different operating conditions. In addition, the ability of the model to predict the rate of hydrogen production for other substrates, photocatalysts, and operating conditions was confirmed by comparing model predictions with experimental data from literature.

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Glycerol hydrodeoxygenation to 1,2-propanediol catalyzed by CuPd/TiO2-Na

Cited by 36 publications

References 56 publications

Nature and Distribution of Cu and Pd Species in CuPd/TiO₂–Na Bimetallic Catalysts for Glycerol Hydrodeoxygenation

Nature and Distribution of Cu and Pd Species in CuPd/TiO₂–Na Bimetallic Catalysts for Glycerol Hydrodeoxygenation

A review of recent developments on kinetics parameters for glycerol electrochemical conversion – A by-product of biodiesel

An intrinsic kinetic model for liquid‐phase photocatalytic hydrogen production

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Glycerol hydrodeoxygenation to 1,2-propanediol catalyzed by CuPd/TiO2-Na

Cited by 36 publications

References 56 publications

Nature and Distribution of Cu and Pd Species in CuPd/TiO2–Na Bimetallic Catalysts for Glycerol Hydrodeoxygenation

Nature and Distribution of Cu and Pd Species in CuPd/TiO2–Na Bimetallic Catalysts for Glycerol Hydrodeoxygenation

A review of recent developments on kinetics parameters for glycerol electrochemical conversion – A by-product of biodiesel

An intrinsic kinetic model for liquid‐phase photocatalytic hydrogen production

Contact Info

Product

Resources

About

Nature and Distribution of Cu and Pd Species in CuPd/TiO₂–Na Bimetallic Catalysts for Glycerol Hydrodeoxygenation

Nature and Distribution of Cu and Pd Species in CuPd/TiO₂–Na Bimetallic Catalysts for Glycerol Hydrodeoxygenation