Hydrogen production from ethanol over bimetallic Rh-M/CeO2 (M=Pd or Pt)

Sheng, P Y; Chiu, Wei-Cheng; Yee, Anna; Morrison, Scott J.; Idriss, Hicham

doi:10.1016/j.cattod.2006.09.040

Cited by 67 publications

(60 citation statements)

References 38 publications

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“…18 The Rh-Pt/ ZrO 2 catalyst washcoated on cordierite monoliths has a 100% ethanol conversion and a >65% H 2 selectivity at 600 °C. 18 Similar results are reported by Sheng et al 36 using a Rh-Pt/CeO 2 catalyst, wherein the H 2 selectivity is 60% at temperatures greater than 400 °C. Cobo et al 17 used Rh-Pt/La 2 O 3 catalyst to effect the complete conversion of ethanol with an H 2 selectivity of 88% at 600 °C; the formation of catalytically active Rh-Pt-Rh 2 O 3 was postulated.…”

Section: Catalysts Based On Rh-ptsupporting

confidence: 77%

Advances in Ethanol Reforming for the Production of Hydrogen

2014

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Catalytic steam reforming of ethanol (SRE) is a promising route for the production of renewable hydrogen (H 2 ). This article reviews the influence of doping supported-catalysts used in SRE on the conversion of ethanol, selectivity for H 2 , and stability during long reaction periods. In addition, promising new technologies such as membrane reactors and electrochemical reforming for performing SRE are presented.

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Section: Catalysts Based On Rh-ptsupporting

confidence: 77%

Advances in Ethanol Reforming for the Production of Hydrogen

2014

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“…According to this, the reduction of the catalysts at 700 °C before reaction appears to favor the availability of Pt on the catalyst surface, mitigating its adsorption into the support. However, Rh/(Rh + Pt) ratio approached to expected in RhPt/CeO2 and RhPt/ZrO2 after reaction, showing a possible adsorption of Pt into either the particles or the support [60,61]. In contrast, no significant changes in Rh/(Rh + Pt) ratio of reduced and aged RhPt/La2O3 samples were observed, but the total content of the metals on the surface decreased.…”

Section: Tem/edx Of Reduced and Aged Catalystsmentioning

confidence: 70%

“…Although the determination of the cerium oxide state from Ce 3d level spectra is difficult, we reviewed several publications trying to establish the contribution of Ce +3 and Ce +4 in each catalyst sample. Ce +4 could be ascribed to shoulders at 882, 888, 899, 901, 908, and 917 eV, [55,60,66] and Ce +3 can be seen at 885 and 903 eV [55,60,64]. Both species play an important role in the catalytic process.…”

Section: Xpsmentioning

confidence: 95%

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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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“…It is known from the literature that the particle size determination from TEM images is not an easy task. Idriss et al 65 ), the size varied from 4 to 8 nm. 66 In our case, the surface areas of the supported catalysts were 19.8-17 m 2 g À1 (Table 1), depending on the Rh content View Article Online (0.1-5%).…”

Section: Characterization By Powder X-ray Diffraction (Xrd) and Transmentioning

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.

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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.

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Hydrogen production from ethanol over bimetallic Rh-M/CeO2 (M=Pd or Pt)

Cited by 67 publications

References 38 publications

Advances in Ethanol Reforming for the Production of Hydrogen

Advances in Ethanol Reforming for the Production of Hydrogen

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

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

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Hydrogen production from ethanol over bimetallic Rh-M/CeO2 (M=Pd or Pt)

Cited by 67 publications

References 38 publications

Advances in Ethanol Reforming for the Production of Hydrogen

Advances in Ethanol Reforming for the Production of Hydrogen

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

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

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Product

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