Hydrogen production by steam reforming of ethanol on a RhPt/CeO2/SiO2 catalyst: Synergistic effect of the Si:Ce ratio on the catalyst performance

Cifuentes, Bernay; Hernández, María Daniela; Monsalve, Sonia; Cobo, Martha

doi:10.1016/j.apcata.2016.06.014

Cited by 39 publications

(15 citation statements)

References 56 publications

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“…Hydrogen is a valid alternative to conventional fuels due to its ability to burn without emitting environmental pollutants, as well as its high energy content per unit of weight (142 KJ/g [2], 2.75 times greater than that of hydrocarbon fuels). Nowadays, methane steam reforming is the most conventional and economical process for hydrogen production [3,4] but other technologies, including biofuels conversion, have been intensively investigated, also due to the bio-feedstock's ability to act as an emission sink within a carbon-balanced life-cycle [5,6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

et al. 2017

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Abstract:In this work, a series of CeO 2 -SiO 2 (30 wt % of ceria)-based catalysts was prepared by the wetness impregnation method and tested for ESR (ethanol steam reforming) at 450-500 • C, atmospheric pressure and a water/ethanol ratio increasing from 4 to 6 (the ethanol concentration being fixed to 10 vol %); after every test, coke gasification measurements were performed at the same water partial pressure, and the temperature of the test and the gasified carbon was measured from the areas under the CO and CO 2 profiles. Finally, oxidation measurements under a 5% O 2 /N 2 stream made it possible to calculate the total carbon deposited. In an attempt to improve the coke resistance of a Pt-Ni/CeO 2 -SiO 2 catalyst, the effect of support basification by alkali addition (K and Cs), as well as Pt substitution by Rh was investigated. The novel catalysts, especially those containing Rh, displayed a lowering in the carbon formation rate; however, a faster reduction of ethanol conversion with time-on-stream and lessened hydrogen selectivities were recorded. In addition, no significant gain in terms of coke gasification rates was observed. The most active catalyst (Pt-Ni/CeO 2 -SiO 2 ) was also tested under different operative conditions, in order to study the effect of temperature and water/ethanol ratio on carbon formation and gasification. The increase in the water content resulted in an enhanced reactor-plugging time due to reduced carbonaceous deposits formation; however, no effect of steam concentration on the carbon gasification rate were recorded. On the other hand, the increase in temperature from 450-500 • C lowered the coke selectivity by almost one order of magnitude improving, at the same time, the contribution of the gasification reactions.

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Section: Introductionmentioning

confidence: 99%

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

et al. 2017

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“…Similarly, Kaila et al [34] (Figure 1d), which could explain the higher H 2 yield for this catalyst ( Figure 1b). As discussed in our previous work [32,37], evidence of Rh-Pt alloy formation was found on the RhPt/CeO 2 catalysts. Thus, Rh-Pt alloy formation on RhPt/CeO 2 catalysts promotes different product distributions depending on the Rh-Pt ratio.…”

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

confidence: 82%

“…RhPt/CeO 2 catalyst samples with different Rh-Pt weight ratios (Table 2) were prepared by the incipient wetness co-impregnation method according to previous reports [32,37]. This method was selected because is effective to load active metals in metal oxide supports and ensure high dispersion [34,74].…”

Section: Catalyst Synthesismentioning

confidence: 99%

“…RhPt/CeO 2 catalysts were evaluated in a fixed bed reactor (internal diameter = 12 mm) at atmospheric pressure under kinetic control, according to a previous report [37]. For that, a liquid mixture with a stoichiometric molar ratio of ethanol to water S/E = 3 (0.03 mL/min) was pumped into an evaporator (200 • C, atmospheric pressure) using a Simdos 02 metering pump (KNF Neuberger, Trenton, NJ, USA) and then mixed with N 2 carrier gas (300 mL/min).…”

Section: Catalytic Testsmentioning

confidence: 99%

“…Nevertheless, in some areas of chemistry and chemical engineering, RSM is poorly used. Recently, the use of RSM in catalysis for the evaluation of catalysts and process optimization was reported [37,38]. RSM allows for direct predictions about the performance of a process in a particular region from experimental data.…”

Section: Introductionmentioning

confidence: 99%

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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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Hydrogen Production from Oxygenated Hydrocarbons: Review of Catalyst Development, Reaction Mechanism and Reactor Modeling

Mohamedali

Henni

Ibrahim

2017

Hydrogen Production Technologies

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Hydrogen production by steam reforming of ethanol on a RhPt/CeO2/SiO2 catalyst: Synergistic effect of the Si:Ce ratio on the catalyst performance

Cited by 39 publications

References 56 publications

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

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

Hydrogen Production from Oxygenated Hydrocarbons: Review of Catalyst Development, Reaction Mechanism and Reactor Modeling

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