MMT-supported Ni/TiO2 nanocomposite for low temperature ethanol steam reforming toward hydrogen production

Mulewa, William; Tahir, Muhammad Nawaz; Amin, Nor Aishah Saidina

doi:10.1016/j.cej.2017.06.012

Cited by 93 publications

(26 citation statements)

References 70 publications

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“…The band shifts little among the three catalysts. The band at around 2350 cm −1 , assigned to the vibration of CO2 [47], does not appear in the FTIR spectra. This verifies that the C-C cleavage of ethanol is greatly inhibited on the three Au- The band at 1755 cm −1 gradually increases with the extension of irradiation time, which corresponds to the vibration related with acetaldehyde molecule [46].…”

Section: Figurementioning

confidence: 92%

Enhanced Hydrogen Production from Ethanol Photoreforming by Site-Specific Deposition of Au on Cu2O/TiO2 p-n Junction

Luo

Zhang

et al. 2020

Catalysts

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Hydrogen production by photoreforming of biomass-derived ethanol is a renewable way of obtaining clean fuel. We developed a site-specific deposition strategy to construct supported Au catalysts by rationally constructing Ti3+ defects inTiO2 nanorods and Cu2O-TiO2 p-n junction across the interface of two components. The Au nanoparticles (~2.5 nm) were selectively anchored onto either TiO2 nanorods (Au@TiO2/Cu2O) or Cu2O nanocubes (Au@Cu2O/TiO2) or both TiO2 and Cu2O (Au@TiO2/Cu2O@Au) with the same Au loading. The electronic structure of supported Au species was changed by forming Au@TiO2 interface due to the adjacent Ti3+ defects and the associated oxygen vacancies while unchanged in Au@Cu2O/TiO2 catalyst. The p-n junction of TiO2/Cu2O promoted charge separation and transfer across the junction. During ethanol photoreforming, Au@TiO2/Cu2O catalyst possessing both the Au@TiO2 interface and the p-n junction showed the highest H2 production rate of 8548 μmol gcat−1 h−1 under simulated solar light, apparently superior to both Au@TiO2 and Au@Cu2O/TiO2 catalyst. The acetaldehyde was produced in liquid phase at an almost stoichiometric rate, and C−C cleavage of ethanol molecules to form CH4 or CO2 was greatly inhibited. Extensive spectroscopic results support the claim that Au adjacent to surface Ti3+ defects could be active sites for H2 production and p-n junction of TiO2/Cu2O facilitates photo-generated charge transfer and further dehydrogenation of ethanol to acetaldehyde during the photoreforming.

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Section: Figurementioning

confidence: 92%

Enhanced Hydrogen Production from Ethanol Photoreforming by Site-Specific Deposition of Au on Cu2O/TiO2 p-n Junction

Luo

Zhang

et al. 2020

Catalysts

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“…The most widely studied approaches for converting ethanol into H2 are steam-based reforming (SR) processes, where vapours of ethanol and water at a specific ratio are introduced into a reactor heated to high temperature (> 700°C) to enable reactions, such as those in equation 1-2, to proceed with or without specially selected or designed catalysts [5,7,8]. As SR of ethanol is a highly endothermic process, large amounts of energy supplied by high temperatures and/or high pressures are needed to drive the reactions.…”

Section: Introductionmentioning

confidence: 99%

Plasma-enabled catalyst-free conversion of ethanol to hydrogen gas and carbon dots near room temperature

Zhou

Xian

et al. 2020

Chemical Engineering Journal

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Selective conversion of bio-renewable ethanol under mild conditions especially at room temperature remains a major challenge for sustainable production of hydrogen and valuable carbon-based materials. In this study, adaptive non-thermal plasma is applied to deliver pulsed energy to rapidly and selectively reform ethanol in the absence of a catalyst.Importantly, the carbon atoms in ethanol that would otherwise be released into the environment in the form of CO or CO2 are effectively captured in the form of carbon dots (CDs). Three modes of non-thermal spark plasma discharges, i.e. single spark mode (SSM), multiple spark mode (MSM) and gliding spark mode (GSM), provide additional flexibility in ethanol reforming by controlling the processes of energy transfer and distribution, thereby affecting the flow rate, gas content, and energy consumption in H2 production. A favourable combination of low temperature (< 40°C), attractive conversion rate (gas flow rate of ~120 mL/min), high hydrogen yield (H2 content > 90%), low energy consumption (~0.96 kWh/m 3 H2) and the effective generation of photoluminescent CDs (which are proved to be applicable for bioimaging or biolabelling) in the MSM indicate that the proposed strategy may offer a new carbon-negative avenue for comprehensive utilization of alcohols and mitigating the increasingly severe energy and environmental issues.

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“…S1 †) exhibited type IV isotherms, according to the IUPAC classication. 33 According to the Table S1 and Fig. S2 † the application of 0.04 wt% MMT was benecial for the dispersion of rGO and the enhanced adsorption capability.…”

Section: Characterization Of Aerogelmentioning

confidence: 94%

The utilization of a three-dimensional reduced graphene oxide and montmorillonite composite aerogel as a multifunctional agent for wastewater treatment

Zhang

Yan

et al. 2018

RSC Adv.

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MMT-supported Ni/TiO2 nanocomposite for low temperature ethanol steam reforming toward hydrogen production

Cited by 93 publications

References 70 publications

Enhanced Hydrogen Production from Ethanol Photoreforming by Site-Specific Deposition of Au on Cu2O/TiO2 p-n Junction

Enhanced Hydrogen Production from Ethanol Photoreforming by Site-Specific Deposition of Au on Cu2O/TiO2 p-n Junction

Plasma-enabled catalyst-free conversion of ethanol to hydrogen gas and carbon dots near room temperature

The utilization of a three-dimensional reduced graphene oxide and montmorillonite composite aerogel as a multifunctional agent for wastewater treatment

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