Hydrogen production by bioethanol partial oxidation over Ni based catalysts

Kraleva, Elka; Pohl, Marga‐Martina; Jürgensen, Astrid; Ehrich, Heike

doi:10.1016/j.apcatb.2015.06.004

Cited by 25 publications

(6 citation statements)

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“…The fact that the peak is broad and asymmetric indicates the presence of a multitude of such NiO species with different strength of binding to the support [32,33]. The third and most important reduction event appears at 817˘10˝C.…”

Section: Physicochemical Characteristics Of the Ni-catalystsmentioning

confidence: 99%

Ni Catalysts Supported on Modified Alumina for Diesel Steam Reforming

et al. 2016

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Nickel catalysts are the most popular for steam reforming, however, they have a number of drawbacks, such as high propensity toward coke formation and intolerance to sulfur. In an effort to improve their behavior, a series of Ni-catalysts supported on pure and La-, Ba-, (La+Ba)-and Ce-doped γ-alumina has been prepared. The doped supports and the catalysts have been extensively characterized. The catalysts performance was evaluated for steam reforming of n-hexadecane pure or doped with dibenzothiophene as surrogate for sulphur-free or commercial diesel, respectively. The undoped catalyst lost its activity after 1.5 h on stream. Doping of the support with La improved the initial catalyst activity. However, this catalyst was completely deactivated after 2 h on stream. Doping with Ba or La+Ba improved the stability of the catalysts. This improvement is attributed to the increase of the dispersion of the nickel phase, the decrease of the support acidity and the increase of Ni-phase reducibility. The best catalyst of the series doped with La+Ba proved to be sulphur tolerant and stable for more than 160 h on stream. Doping of the support with Ce also improved the catalytic performance of the corresponding catalyst, but more work is needed to explain this behavior.

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Section: Physicochemical Characteristics Of the Ni-catalystsmentioning

confidence: 99%

Ni Catalysts Supported on Modified Alumina for Diesel Steam Reforming

et al. 2016

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“…As illustrated in Figure , the conversion of ethanol increased with the oxygen-to-ethanol molar ratio. Although there is evidence that byproducts (mainly acetaldehyde and ethylene, ,− including diethyl ether) are formed during the partial oxidation of ethanol, in this work, the products were assumed to be only H 2 , CO, CO 2 , CH 4 , and H 2 O (not measured). Although the equilibrium calculation predicted that the conversion of ethanol would be almost complete, the experiments demonstrated that the transformation of ethanol into the product gases was limited (less than 80%).…”

Section: Resultsmentioning

confidence: 94%

“…Therefore, heat can be accumulated inside the catalyst channel and the temperature can be correspondingly increased. The seven possible products were hydrogen, carbon monoxide, carbon dioxide, methane (CH 4 ), acetaldehyde (CH 3 CHO), ethylene (C 2 H 4 ), and carbon (C). Table presents potential reaction pathways for the species formed during the partial oxidation of ethanol.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen Production via the Catalytic Partial Oxidation of Ethanol on a Platinum–Rhodium Catalyst: Effect of the Oxygen-to-Ethanol Molar Ratio and the Addition of Steam

et al. 2019

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To produce hydrogen for automotive exhaust gas aftertreatment systems, the catalytic partial oxidation of ethanol over a platinum–rhodium catalyst supported on alumina is examined via experimental studies as well as thermodynamic analysis. The research focuses on the effects of the ethanol concentration, oxygen-to-ethanol molar ratio, and water content of ethanol on the ethanol conversion and product yield (e.g., H2, CO, CO2, and CH4). The hot spot temperature and position and the temperature profile along the monolithic catalyst are also analyzed as a function of the inlet gas composition. Different surface chemical reactions (e.g., partial oxidation and steam reforming of ethanol, water–gas shift, and hydrocarbon cracking) are employed to explain the phenomena that take place during ethanol reforming. The process follows the indirect reforming pathway, which involves the exothermic oxidation of ethanol to produce H2O, CO2, and heat, followed by endothermic steam reforming to generate CO and H2. The temperature profile inside the catalyst depends critically on the amount of ethanol supplied and the oxygen-to-ethanol molar ratio. The ethanol conversion, hydrogen production, and selectivity toward hydrogen and methane depend strongly on the operating conditions. The addition of steam has a slightly positive effect on the hydrogen formation and temperature profile.

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“…The production of hydrogen by means of partial oxidation can be derived from various hydrocarbon molecules as well as biomaterials. Catalyst activity in the partial oxidation of bioethanol was studied by Kraleva et al (2015) over xNiAlZn catalysts at various Ni loadings, while Wang et al (2016) investigated partial oxidation of a mixture of phenol, acetic acid and naphthalene in supercritical water.…”

Section: Partial Oxidation Of Methanementioning

confidence: 99%

Hydrogen applications and research activities in its production routes through catalytic hydrocarbon conversion

Baharudin

Watson

2017

Reviews in Chemical Engineering

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AbstractThe statistical information on the share of hydrogen sector-wise consumption indicates that 95% of the total consumption is utilized in ammonia synthesis, petroleum refining processes and methanol production. We discuss how hydrogen is used in these processes and in several smaller-scale manufacturing industries. We also present the trend of hydrogen used as fuel, and as an energy carrier in fuel cells for generating electricity, powering hydrogen vehicles, as well as in aerospace applications. Natural gas caters for approximately half of the total hydrogen production resources. Therefore, the scope is emphasized on relatively recent developments in research activities related to the conventional catalytic hydrocarbon processing technologies for the production of hydrogen derived from natural gas (methane), which are steam methane reforming, partial oxidation of methane and autothermal reforming. Hydrocarbon decomposition is included due to its potential to be industrialized in the future, and its benefits of producing clean hydrogen without emissions of greenhouse gases and generating carbon nanofibers or nanotubes as by-products that have the potential in various emerging applications. Attention is given to the efforts toward achieving hydrocarbon conversion improvements, energy savings through thermally efficient operation and reduced operational costs through minimization or elimination of coke formation in the catalytic processes.

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Hydrogen production by bioethanol partial oxidation over Ni based catalysts

Cited by 25 publications

References 50 publications

Ni Catalysts Supported on Modified Alumina for Diesel Steam Reforming

Ni Catalysts Supported on Modified Alumina for Diesel Steam Reforming

Hydrogen Production via the Catalytic Partial Oxidation of Ethanol on a Platinum–Rhodium Catalyst: Effect of the Oxygen-to-Ethanol Molar Ratio and the Addition of Steam

Hydrogen applications and research activities in its production routes through catalytic hydrocarbon conversion

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