Ethanol steam reforming over Rh and Pt catalysts: effect of temperature and catalyst deactivation

Bilal, Muhammad; Jackson, S. David

doi:10.1039/c2cy20703f

Cited by 67 publications

(42 citation statements)

References 36 publications

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“…This behaviour was seen previously with Rh/alumina [19] and was understood in the context of the catalyst being effectively poisoned for ethene hydrogenation by the presence of carbon monoxide. The rapid deactivation observed when using these impurities (IPA and 1-propanol) can be ascribed to the formation of the respective alkenes by dehydration, similar to that found with ethanol.…”

Section: Rh/aluminamentioning

confidence: 65%

“…acetaldehyde, are not shown.) 26 As we have outlined previously this underestimates the hydrogen yield as it takes no account of hydrogen produced during carbon laydown [17][18][19]. Nevertheless it does give a correct carbon and oxygen balance.…”

Section: Rh/aluminamentioning

confidence: 96%

“…This suggests two separate sites for these reactions and that they are deactivated in different ways depending upon the impurity. shown [18,19] that, after use in ESR, the alumina gives a TPO evolution at 985 K that can be assigned to graphitic carbon formed through ethanol decomposition. However over the alumina the extent of carbon deposition was much smaller than that observed over the catalysts.…”

Section: Rh/aluminamentioning

confidence: 99%

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Ethanol steam reforming over Pt/Al 2 O 3 and Rh/Al 2 O 3 catalysts: The effect of impurities on selectivity and catalyst deactivation

Bilal

Jackson

2017

Applied Catalysis A: General

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Ethanol steam reforming over Pt/Al2O3 and Rh/Al2O3 catalysts: the effect of impurities on selectivity and catalyst deactivation. Applied Catalysis A: General, 529, pp. 98-107. (doi:10.1016General, 529, pp. 98-107. (doi:10. /j.apcata.2016 This is the author's final accepted version.There may be differences between this version and the published version. You are advised to consult the publisher's version if you wish to cite from it. impurities. The addition of 1 mol % C 3 alcohols (1-propanol and isopropyl alcohol)significantly decreased the conversion of ethanol and increased the rate of catalyst deactivation. This deactivation of the catalyst in the presence of C 3 alcohols was attributed to high olefin formation and incomplete decomposition of the C 3 alcohols, which deposited over the catalysts as coke. Propanal, propylamine and acetone addition to the water/ethanol mixture resulted in rapid metal deactivation and a loss of steam reforming activity over the Pt/alumina although ethanol decomposition continued. In contrast the Rh/alumina did not lose all steam reforming activity when acetone and propylamine were added as impurities. On both the catalysts alcoholic impurities produced a large number of carbon nanotubes (CNTs).

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Section: Rh/aluminamentioning

confidence: 65%

Section: Rh/aluminamentioning

confidence: 96%

Section: Rh/aluminamentioning

confidence: 99%

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Ethanol steam reforming over Pt/Al 2 O 3 and Rh/Al 2 O 3 catalysts: The effect of impurities on selectivity and catalyst deactivation

Bilal

Jackson

2017

Applied Catalysis A: General

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“…The SRE can also be represented by a network of reactions (Equations (2)- (10)) [5][6][7], depending on the reaction conditions and the catalyst used, to reflect the formation of a complex set of by-products including carbon monoxide (CO), methane (CH4), ethane (C2H6), ethylene (C2H4), and acetaldehyde (CH3CHO) [4,8,9]. …”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

et al. 2015

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CeO2-, ZrO2-, and La2O3-supported Rh-Pt catalysts were tested to assess their ability to catalyze the steam reforming of ethanol (SRE) for H2 production. SRE activity tests were performed using EtOH:H2O:N2 (molar ratio 1:3:51) at a gaseous space velocity of 70,600 h −1 between 400 and 700 °C at atmospheric pressure. The SRE stability of the catalysts was tested at 700 °C for 27 h time on stream under the same conditions. RhPt/CeO2, which showed the best performance in the stability test, also produced the highest H2 yield above 600 °C, followed by RhPt/La2O3 and RhPt/ZrO2. The fresh and aged catalysts were characterized by TEM, XPS, and TGA. The higher H2 selectivity of RhPt/CeO2 was ascribed to the formation of small (~5 nm) and stable particles probably consistent of Rh-Pt alloys with a Pt surface enrichment. Both metals were oxidized and acted as an almost constant active phase during the stability test owing to strong metal-support interactions, as well as the superior oxygen mobility of the support. The TGA results confirmed the absence of carbonaceous residues in all the aged catalysts.

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“…Below 520 • C, Pt 0.8 /CeO 2 showed a higher H 2 yield. Pt favors CO adsorption on the catalyst surface and affects the reducible species on the support [13], promoting H 2 production by WGSR [28,44] (Equation (2)), which is favored at low temperature because it is an exothermic reaction [45]. Rh would also slightly favor WGSR [46].…”

Section: Effect Of the Rh-pt Ratio On The Catalytic Performancementioning

confidence: 99%

Response Surface Methodology and Aspen Plus Integration for the Simulation of the Catalytic Steam Reforming of Ethanol

2017

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Abstract:The steam reforming of ethanol (SRE) on a bimetallic RhPt/CeO 2 catalyst was evaluated by the integration of Response Surface Methodology (RSM) and Aspen Plus (version 9.0, Aspen Tech, Burlington, MA, USA, 2016). First, the effect of the Rh-Pt weight ratio (1:0, 3:1, 1:1, 1:3, and 0:1) on the performance of SRE on RhPt/CeO 2 was assessed between 400 to 700 • C with a stoichiometric steam/ethanol molar ratio of 3. RSM enabled modeling of the system and identification of a maximum of 4.2 mol H 2 /mol EtOH (700 • C) with the Rh 0.4 Pt 0.4 /CeO 2 catalyst. The mathematical models were integrated into Aspen Plus through Excel in order to simulate a process involving SRE, H 2 purification, and electricity production in a fuel cell (FC). An energy sensitivity analysis of the process was performed in Aspen Plus, and the information obtained was used to generate new response surfaces. The response surfaces demonstrated that an increase in H 2 production requires more energy consumption in the steam reforming of ethanol. However, increasing H 2 production rebounds in more energy production in the fuel cell, which increases the overall efficiency of the system. The minimum H 2 yield needed to make the system energetically sustainable was identified as 1.2 mol H 2 /mol EtOH. According to the results of the integration of RSM models into Aspen Plus, the system using Rh 0.4 Pt 0.4 /CeO 2 can produce a maximum net energy of 742 kJ/mol H 2 , of which 40% could be converted into electricity in the FC (297 kJ/mol H 2 produced). The remaining energy can be recovered as heat.

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Ethanol steam reforming over Rh and Pt catalysts: effect of temperature and catalyst deactivation

Cited by 67 publications

References 36 publications

Ethanol steam reforming over Pt/Al 2 O 3 and Rh/Al 2 O 3 catalysts: The effect of impurities on selectivity and catalyst deactivation

Ethanol steam reforming over Pt/Al 2 O 3 and Rh/Al 2 O 3 catalysts: The effect of impurities on selectivity and catalyst deactivation

Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

Response Surface Methodology and Aspen Plus Integration for the Simulation of the Catalytic Steam Reforming of Ethanol

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