Hydrogen production by partial oxidation of ethanol/gasoline blends over Rh/Al2O3

Diehm, Claudia; Kaltschmitt, Torsten; Deutschmann, Olaf

doi:10.1016/j.cattod.2012.06.032

Cited by 11 publications

(5 citation statements)

References 41 publications

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“…This ethoxide is dehydrogenated to C 2 H 4 O. Nevertheless, using a Pd/Y 2 O 3 catalyst, C 2 H 4 O is not produced, − but when Pd/CeO 2 is employed, acetaldehyde is observed among the products. ,,, …”

Section: Resultsmentioning

confidence: 99%

Ethanol Oxidative Steam Reforming over Rh(1%)/MgAl₂O₄/Al₂O₃ Catalyst

Graschinsky

Contreras

Amadeo

et al. 2014

Ind. Eng. Chem. Res.

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The ethanol oxidative steam reforming reaction was studied over a rhodium-based catalyst that was prepared by wet impregnation method. The oxygen-to-ethanol ratio (R o = 0−1.2), space time (τ Et = 15−45 g cat •min/mol Et ), and temperature (T = 673−873 K) were varied to determine the reaction scheme. The catalyst showed excellent selectivity for the production of hydrogen and a very good stability. A network of eight reactions was used: ethanol decomposition and steam reforming; water gas shift; methane steam reforming; and ethanol, methane, carbon monoxide, and hydrogen oxidations. The obtained results suggest that the oxidation reactions predominate in the first part of the reactor and at low temperatures. Ethanol partial oxidation was also studied, and the same reaction scheme was found for this reaction when varying R o (0.25−1.0), τ Et (9.5−45.8 g cat •min/ mol Et ) and T (573−673 K). Finally, a reaction mechanism of 22 elementary steps was proposed, and the kinetic parameters were obtained.

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Section: Resultsmentioning

confidence: 99%

Ethanol Oxidative Steam Reforming over Rh(1%)/MgAl₂O₄/Al₂O₃ Catalyst

Graschinsky

Contreras

Amadeo

et al. 2014

Ind. Eng. Chem. Res.

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“…Almost all data found in the literature for iso-octane CPO were collected in integral fashion. ,,− In this work we apply the combination of spatially resolved sampling techniques and mathematical modeling of the adiabatic reactor in order to gain a better insight on the specific behavior of iso-octane in the CPO process. In particular, the goal of this work is the comparison between methane CPO and iso-octane CPO on Rh-coated monoliths, focusing on the role of mass transfer limitations, the thermal management and catalyst deactivation.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Partial Oxidation of Iso-octane over Rh/α-Al₂O₃ in an Adiabatic Reactor: An Experimental and Modeling Study

Carrera

Groppi

2017

Ind. Eng. Chem. Res.

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Catalytic partial oxidation (CPO) of hydrocarbons represents an interesting technology for hydrogen production on mobile systems. We investigated the CPO of 2,2,4-trimethyl pentane (iso-octane), chosen as surrogate for gasoline. CPO experiments were carried out in a laboratory scale autothermal reformer with honeycomb monolith catalysts (2% Rh/α-Al 2 O 3 ), equipped with probes for spatially resolved measurements of temperature and concentration. The iso-octane CPO process follows a reaction pathway which mainly consists of the exothermic combustion reaction and the endothermic steam reforming. The chemical reaction is very fast, and sharp gradients of temperature and concentration establish at the catalyst inlet. Similarly to the CPO of light hydrocarbons, the consecutive reaction mechanism results in the formation of a hot spot of temperature at the catalyst inlet. However, compared to light hydrocarbons, this phenomenology is specifically emphasized in the case of iso-octane, because of the higher overall exothermicity and the lower diffusion rate, which limits the steam reforming reaction rate. The reactor design strategy previously suggested in the CPO of methane, based on the enlargement of the channel opening to selectively limit the rate of oxygen consumption, does not work for the CPO of iso-octane where the consumption of the fuel is also considerably limited by mass transfer.

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“…Substantial efforts in reforming modelling have been made to understand the influence of the type of catalyst [21], C/O ratio [21] and reforming fuel type [22][23][24] on reforming pathways, hydrogen production and process efficiency. For instance, it has been concluded that in the case of short chain length alcohol fuels reforming lower temperatures are required when compared to gasoline due to the alcohols rapid and strong adsorption, high reactivity, high diffusivity, high H/C ratio and steric hindrance [25,26].…”

Section: Introductionmentioning

confidence: 99%

Study of particulate matter and gaseous emissions in gasoline direct injection engine using on-board exhaust gas fuel reforming

et al. 2016

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Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.

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Hydrogen production by partial oxidation of ethanol/gasoline blends over Rh/Al2O3

Cited by 11 publications

References 41 publications

Ethanol Oxidative Steam Reforming over Rh(1%)/MgAl₂O₄/Al₂O₃ Catalyst

Ethanol Oxidative Steam Reforming over Rh(1%)/MgAl₂O₄/Al₂O₃ Catalyst

Catalytic Partial Oxidation of Iso-octane over Rh/α-Al₂O₃ in an Adiabatic Reactor: An Experimental and Modeling Study

Study of particulate matter and gaseous emissions in gasoline direct injection engine using on-board exhaust gas fuel reforming

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Hydrogen production by partial oxidation of ethanol/gasoline blends over Rh/Al2O3

Cited by 11 publications

References 41 publications

Ethanol Oxidative Steam Reforming over Rh(1%)/MgAl2O4/Al2O3 Catalyst

Ethanol Oxidative Steam Reforming over Rh(1%)/MgAl2O4/Al2O3 Catalyst

Catalytic Partial Oxidation of Iso-octane over Rh/α-Al2O3 in an Adiabatic Reactor: An Experimental and Modeling Study

Study of particulate matter and gaseous emissions in gasoline direct injection engine using on-board exhaust gas fuel reforming

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Ethanol Oxidative Steam Reforming over Rh(1%)/MgAl₂O₄/Al₂O₃ Catalyst

Ethanol Oxidative Steam Reforming over Rh(1%)/MgAl₂O₄/Al₂O₃ Catalyst

Catalytic Partial Oxidation of Iso-octane over Rh/α-Al₂O₃ in an Adiabatic Reactor: An Experimental and Modeling Study