The reactions of ethanol over M/CeO2 catalysts

Yee, Anna; Morrison, Scott J.; Idriss, Hicham

doi:10.1016/s0920-5861(00)00476-4

Cited by 136 publications

(91 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is consistent with previous reports [46,55]. Also, previous investigations of the reaction mechanism of SRE over M/CeO 2 suggested that ethoxy-species and acetaldehyde are involved as intermediates in CH 4 formation [56,57]. Subsequently, the conversion of CH 4 to C1 species is expected at high temperatures [58].…”

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

confidence: 92%

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

2017

View full text Add to dashboard Cite

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.

show abstract

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

confidence: 92%

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

2017

View full text Add to dashboard Cite

show abstract

“…Adsorbed CO exhibits at least three different n(CRO) stretching frequencies belonging to certain adsorption sites on oxide-supported Rh. 15,67,68 The band at 2070-2030 cm À1 is due to CO adsorbed linearly to Rh 0 (depending on the CO coverage). Bridge-bonded CO (Rh 2 -CO) exhibits a band at B1855 cm À1 (not shown) and a pair of peaks at B2100 and B2020 cm À1 corresponds to the asymmetric and symmetric stretching of Rh + (CO) 2 (twin CO).…”

Section: Co Adsorption On Rh/ceria and Co-rh/ceria Drifts Experimentsmentioning

confidence: 99%

“…This is due to the peculiar redox properties and oxygen storage capacity of ceria, as well as to synergetic effects between the ceria support and metals. [8][9][10][11][12][13] Noble metals, especially Rh, have proven to be excellent catalysts for dehydrogenation reactions, [14][15][16] but their prices are prohibitively high. As an alternative, the less expensive transition metal Co is a promising catalyst for the steam reforming of ethanol (SRE).…”

Section: Introductionmentioning

confidence: 99%

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Varga

Pusztai

Óvári³

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The interaction of CeO 2 -supported Rh, Co and bimetallic Rh-Co nanoparticles, which are active catalysts in hydrogen production via steam reforming of ethanol, a process related to renewable energy generation, was studied by X-ray diffraction (XRD), high resolution electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and low energy ion scattering (LEIS). Furthermore, diffuse reflectance infrared spectroscopy (DRIFTS) of adsorbed CO as a probe molecule was used to characterize the morphology of metal particles. At small loadings (0.1%), Rh is in a much dispersed state on ceria, while at higher contents (1-5%), Rh forms 2-8 nm particles. Between 473-673 K pronounced oxygen transfer from ceria to Rh is observed and at 773 K significant agglomeration of Rh occurs. On reduced ceria, XPS indicates a possible electron transfer from Rh to ceria. The formation of smaller ceria crystallites upon loading with Co was concluded from XRD and HRTEM; for 10% Co, the CeO 2 particle size decreased from 27.6 to 10.7 nm. A strong dissolution of Co into ceria and a certain extent of encapsulation by ceria were deduced by XRD, XPS and LEIS. In the bimetallic system, the presence of Rh enhances the reduction of cobalt and ceria.During thermal treatments, reoxidation of Co occurs, and Rh agglomeration as well as oxygen migration from ceria to Rh are hindered in the presence of cobalt.

show abstract

“…The Idriss [83,166,[177][178][179][180] and Noronha [103,158,161,181] groups studied mechanisms of ethanol conversion intensively. The majority of the former's studies focused on the molecular level understanding of ethanol decomposition.…”

Section: Palladiummentioning

confidence: 99%

Catalytic Partial Oxidation of Methanol and Ethanol for Hydrogen Generation

Hohn

Lin

2009

ChemSusChem

View full text Add to dashboard Cite

Hydrogen-powered fuel cell vehicles feature high energy efficiency and minor environmental impact. Liquid fuels are ideal hydrogen carriers, which can catalytically be converted into syngas or hydrogen to power vehicles. Among the potential liquid fuels, alcohols have several advantages. The hydrogen/carbon ratio is higher than that of other liquid hydrocarbons or oxygenates, especially in the case of methanol. In addition, alcohols can be derived from renewable biomass resources. Catalytic partial oxidation of methanol or ethanol offers immense potential for onboard hydrogen generation due to its rapid reaction rate and exothermic nature. These benefits stimulate a burgeoning research community in catalyst design, reaction engineering, and mechanistic investigation. The purpose of this Minireview is to provide insight into syngas and hydrogen production from methanol and ethanol partial oxidation, particularly highlighting catalytic chemistry.

show abstract

The reactions of ethanol over M/CeO2 catalysts

Cited by 136 publications

References 34 publications

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

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

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation

Catalytic Partial Oxidation of Methanol and Ethanol for Hydrogen Generation

Contact Info

Product

Resources

About

The reactions of ethanol over M/CeO2 catalysts

Cited by 136 publications

References 34 publications

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

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

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO2 support: catalytic materials for alternative energy generation

Catalytic Partial Oxidation of Methanol and Ethanol for Hydrogen Generation

Contact Info

Product

Resources

About

Probing the interaction of Rh, Co and bimetallic Rh–Co nanoparticles with the CeO₂ support: catalytic materials for alternative energy generation