Insight into the role of ethylene glycol on thermodynamics and nucleation kinetics of dimethyl terephthalate in mixed solvent system

Zhang, Yujin; Shi, Chao; Tang, Jing; Liu, Li; Yan, Dongxia; Zhou, Qing; Lü, Xingmei; Jia, Songyan

doi:10.1016/j.partic.2023.03.010

Cited by 3 publications

(2 citation statements)

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“…In contrast, the synthesis of NiO p –nanosheets (NiO p –NH) with a length and width of 1.0–1.5 μm is achieved in a deionized water solution (Figure S1b). The observed disparity in morphology between the two types of NiO p can be primarily attributed to the addition of EG as a solvent in the former, which aids in morphology correction, nucleation control, and crystallization . The role of PVP as a surfactant in the formation of NiO p –NP and NiO p –NH is mainly to promote dissolution and stabilize the morphology.…”

Section: Resultsmentioning

confidence: 99%

“…The observed disparity in morphology between the two types of NiO p can be primarily attributed to the addition of EG as a solvent in the former, which aids in morphology correction, nucleation control, and crystallization. 25 The role of PVP as a surfactant in the formation of NiO p −NP and NiO p −NH is mainly to promote dissolution and stabilize the morphology. Subsequently, the NiO nanocatalyst is obtained by calcining the NiO p precursors.…”

Section: Materials Characterizationmentioning

confidence: 99%

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Morphology Engineering toward Highly Efficient NiO Nanocatalysts for Oxygen-Promoted Hydrogen Production from Formaldehyde Solution

Zhu,

Miao,

et al. 2023

ACS Appl. Energy Mater.

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Renewable biomass solutions for hydrogen production are a sustainable technology to boost the hydrogen economy, in which formaldehyde reforming into hydrogen using cost-effective catalysts has garnered significant attention. In this study, we successfully fabricated two stable NiO nanostructures with distinct morphologies, namely nanospheres and nanosheets, through a simple two-step process. The morphology-dependent efficiency of hydrogen production under oxygen-promoted conditions was investigated. The nanosphere-shaped NiO (NiO−NP) exhibited a distinctive three-dimensional network and showed a much higher turnover frequency (TOF: 277.2 h −1 ) for H 2 production from alkaline formaldehyde (HCHO) solution at room temperature, in contrast to NiO nanosheets (NiO−NH, TOF: 153.3 h −1 ). Scanning electron microscopy and thermogravimetric tests revealed that the porous structures consisting of nanoribbons in NiO−NP catalysts facilitated the exposure of the active sites and mass transfer processes. Moreover, X-ray photoelectron spectroscopy indicated a larger peak area ratio of defect sites/lattice oxygen in NiO−NP, suggesting a higher number of oxygen vacancies (Vo). This ensured favorable chemisorption of molecular O 2 on the catalyst surface, establishing a channel for electron delivery to O 2 species, which provided evidence for the more efficient hydrogen production of NiO−NP catalysts under oxygen partial pressure (pO 2 ). Electron paramagnetic resonance results indicated that the breaking of the C−H bond of HCHO was coupled with the O 2 reduction, forming • OOH through preferential two-electron reduction. Notably,• OOH played a crucial role as reactive oxygen species in dehydrogenation reactions, with the • OOH−NiO complex serving as the active center. These findings not only offer possibilities for enhancing catalytic performance through nanostructure engineering but also provide insights into hydrogen production from renewable biomass using cost-effective catalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Materials Characterizationmentioning

confidence: 99%