Aqueous phase reforming of ethylene glycol on Pt/CeO<sub>2</sub>–ZrO<sub>2</sub>: effects of cerium to zirconium molar ratio

Jeon, Soo; Ham, Hyungwon; Suh, Young‐Woong; Bae, Jong Wook

doi:10.1039/c5ra07124k

Cited by 14 publications

(2 citation statements)

References 42 publications

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“…In contrast, ZrO2 and CeO2 were characterized by larger crystallite sizes. Smaller crystallites of mixed oxides of Ce and Zr can be attributed to the incorporation of the small-size zirconium species into the matrix of CeO2 as has been previously described by Jeon et al [40]. Smaller crystallites in case of 10La-Zr comparing to pure ZrO2 can be explained correspondingly.…”

Section: Hydrogen Chemisorptionsupporting

confidence: 63%

Hydrogen production via aqueous-phase reforming of methanol over nickel modified Ce, Zr and La oxide supports

2018

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Aqueous-phase reforming (APR) of methanol over nickel supported on zirconium, cerium and lanthanum oxides was performed in continuous laboratory scale reactor and discussed in this paper. The role of composition and physico-chemical properties of the supports were investigated and significant benefit of using mixed oxides CeO2-ZrO2 and La2O3-ZrO2 over the pure oxides, in term of methanol conversion and hydrogen production, was demonstrated. Methanol conversion of over 50 % with hydrogen production efficiency of over 40 % were achieved with the most active catalyst Ni/25%CeO2-ZrO2.Furthermore, catalyst stability, the most challenging issue within APR studies, was thoroughly investigated and discussed. Slight deactivation of the prepared catalysts during APR experiments or reduction was observed and addressed to the Ni particles sintering. On the other hand, other common reasons causing catalysts deactivation under APR conditions, such as leaching of Ni, changes in Ni oxidation state or changes in the supports lattice were not observed by wide range of characterization methods. The most stable catalyst, Ni/10%La2O3-ZrO2, exhibited a slight decrease of MeOH conversion within two subsequent experiments (each per 6h) from 46.3 % to 42.7 %.

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Section: Hydrogen Chemisorptionsupporting

confidence: 63%

Hydrogen production via aqueous-phase reforming of methanol over nickel modified Ce, Zr and La oxide supports

2018

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“…Pt supported on boehmite showed improved H 2 production rate . When mixed oxide supports were used, the results were interesting: for example, H 2 productivity and stability of Pt/CeO 2 ‐ZrO 2 were dependent on the Ce and Zr content . Adding Cr to the oxide support of Fe resulted in improved Pt dispersion and catalyst performance .…”

Section: Catalytic Studiesmentioning

confidence: 99%

Review of Hydrogen Production by Catalytic Aqueous‐Phase Reforming

Vaidya

López-Sánchez

2017

ChemistrySelect

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Catalytic aqueous‐phase reforming (APR) produces higher quality hydrogen (with less carbon monoxide) and carbon dioxide from weak solutions of bio‐carbohydrates in a single reactor at low temperatures. It provides a good opportunity for the effective valorisation of biomass‐derived products. It is advantageous than steam reforming because it saves energy by avoiding vaporization of the biofeed and lowers cost by precluding an extra water gas shift reactor. As evident from the numerous published works during the past decade, there is growing academic and industrial interest in the APR process. This review updates recent literature on APR of many biomass surrogates such as glycerol, ethylene glycol, sorbitol, ethanol and glucose. Most works focused on the development of efficient catalysts for selective hydrogen production and they were deliberated comprehensively. Key insights into improved catalysts and reaction conditions were highlighted. New inferences on the thermodynamic, kinetic and reactor engineering aspects of the APR process were analysed too. This thorough appraisal of the current literature, which is hitherto missing, will surely contribute to the development of the next generation of catalysts and reactors for commercial applications of the APR process.

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Enhancing concrete sustainability with spent diatomaceous earth from the wine industry: Long‐term experimental and statistical analysis

Magalhães,

Ferreira,

Ramos‐Gavilán

2024

Structural Concrete

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Spent diatomaceous earth, a by‐product of wine filtration, holds significant promise for use in concrete mixtures due to its pozzolanic properties, which enhance concrete performance. This research explores the application of spent calcined diatomaceous earth (SCDE), heat‐treated at 700°C to remove organic content, as a partial substitute for cement or sand in concrete. The high silica content of SCDE contributes to the formation of additional calcium silicate hydrates during the hydration process, leading to improvements in mechanical strength over time. The study includes a preliminary analysis of cement replacements ranging from 5% to 10% and sand replacements from 2.5% to 15%, assessing their effects on workability, density, water absorption, and compressive strength at 7 and 28 days. The testing program focuses on three key compositions: the reference concrete and optimal mixtures with 10% cement and 5% sand replacements. Compressive strength tests are conducted at 7, 28, 90, 180, and 360 days. The results, validated through ANOVA, demonstrate the influence of SCDE on concrete strength over time, with distinctive behavior patterns identified for different mixtures. The strength of concrete with replacements correlates with the reference strength, with a multiplicative factor that varies from 7 to 90 days and then. When SCDE replaces cement, the factor is less than one before 28 days due to the slow pozzolanic reaction, whereas for sand replacement, it always exceeds one because of the initial filler effect. After 90 days, the strength multiplicative factors are 1.13 for cement replacement and 1.30 for sand replacement, demonstrating the potential of SCDE for sustainable concrete manufacturing and its positive long‐term impact on mechanical performance.

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Aqueous phase reforming of ethylene glycol on Pt/CeO₂–ZrO₂: effects of cerium to zirconium molar ratio

Cited by 14 publications

References 42 publications

Hydrogen production via aqueous-phase reforming of methanol over nickel modified Ce, Zr and La oxide supports

Hydrogen production via aqueous-phase reforming of methanol over nickel modified Ce, Zr and La oxide supports

Review of Hydrogen Production by Catalytic Aqueous‐Phase Reforming

Enhancing concrete sustainability with spent diatomaceous earth from the wine industry: Long‐term experimental and statistical analysis

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Aqueous phase reforming of ethylene glycol on Pt/CeO2–ZrO2: effects of cerium to zirconium molar ratio

Cited by 14 publications

References 42 publications

Hydrogen production via aqueous-phase reforming of methanol over nickel modified Ce, Zr and La oxide supports

Hydrogen production via aqueous-phase reforming of methanol over nickel modified Ce, Zr and La oxide supports

Review of Hydrogen Production by Catalytic Aqueous‐Phase Reforming

Enhancing concrete sustainability with spent diatomaceous earth from the wine industry: Long‐term experimental and statistical analysis

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Aqueous phase reforming of ethylene glycol on Pt/CeO₂–ZrO₂: effects of cerium to zirconium molar ratio