Effect of the interactions between Pt species and ceria on Pt/ceria catalysts for water gas shift: The XPS studies

Mei, Zhijian; Liu, Ying; Fan, Maohong; Zhao, Ling; Zhao, Ji

doi:10.1016/j.cej.2014.07.125

Cited by 70 publications

(34 citation statements)

References 26 publications

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“…The pore radius of the other catalysts and the increase of the ZrO2 promoter in the support were inversely proportionate to one another. The pore radii of the catalysts (type 2, 3, and 4) were 23.9 Å, 23.5 Å, and 23.2 Å, respectively [25]. These data showed that Pt,Pd,Ni/Mg0.85Zr0.15O catalyst with a high surface area recorded better performance in the DRM reaction compared with other catalysts.…”

Section: H2-tprmentioning

confidence: 50%

Effects of Platinum and Palladium Metals on Ni/Mg1-xZrxO Catalysts in the CO2 Reforming of Methane

Al-Doghachi

2018

Bull. Chem. React. Eng. Catal.

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Nickel, palladium, and platinum catalysts (1 wt.% each) supported on MgO and MgZrO to prepare Pt,Pd,Ni/Mg1-xZrxO catalysts (where x = 0, 0.03, 0.07, and 0.15), were synthesized by using coprecipitation method with K2CO3 as the precipitant. X-ray diffraction (XRD), X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET), transmission electron microscopy (TEM), H2-temperature programmed reduction (H2-TPR), and thermo gravimetric analysis (TGA) were employed to observe the characteristics of the prepared catalysts. The Pt,Pd,Ni/Mg0.85Zr0.15O showed the best activity in dry reforming of methane (DRM) with 99 % and 91 % for CO2 and CH4 conversions, respectively and 1.28 for H2/CO ratio at temperature 900 °C and 1:1 of CH4:CO2 ratio. The stability of Pt,Pd,Ni/Mg0.85Zr0.15O catalyst in the presence and absence of low stream 1.25 % oxygen was investigated. Carbon formation and amount in spent catalysts were examined by TEM and TGA in the presence of stream oxygen. The results showed that the amount of carbon was suppressed and negligible coke formation (less than 3 %) was observed. Several effects were observed with ZrO2 use as a promoter in the catalyst. Firstly, the magnesia cubic phase stabilized. Secondly, thermal stability and support for basicity increased. Thirdly, carbon deposition and the reducibility of Ni 2+ , Pd 2+ , and Pt 2+ ions decreased.

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Section: H2-tprmentioning

confidence: 50%

Effects of Platinum and Palladium Metals on Ni/Mg1-xZrxO Catalysts in the CO2 Reforming of Methane

Al-Doghachi

2018

Bull. Chem. React. Eng. Catal.

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“…As previously observed, the interaction of Ni with a noble metal results in an easier reduction of the non-noble metal, shifting, at the same time, the characteristic reduction peaks towards lower temperatures than that observed for the Ni/CeO2-SiO2 sample [55]. Hydrogen spillover resulted in a total hydrogen uptake of 2735 μmol/gcat (Table 2, against a theoretical value of 2012 μmol/gcat): the enhancement of CeO2 reduction, observed at lower temperatures than that recorded over the bare support, is promoted by the metalssupport interaction, which weakened the Ce-O bond, thus increasing the mobility of lattice oxygen [56][57][58]. …”

Section: Catalysts Characterizationmentioning

confidence: 93%

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

et al. 2017

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Abstract:In this research, a bimetallic Pt-Ni/CeO 2 -SiO 2 catalyst, synthetized via wet impregnation, was successfully employed for the oxidative steam reforming of ethanol between 300 and 600 • C. The reaction performance of the Pt-Ni catalyst was investigated and compared with the Ni/CeO 2 -SiO 2 , Pt/CeO 2 -SiO 2 as well as CeO 2 -SiO 2 sample. The bimetallic catalyst displayed the best results in terms of hydrogen yield and by-products selectivity, thus highlighting the crucial role of active species (Pt and Ni) in promoting ethanol conversion and reaching the products distribution predicted by thermodynamics. The most promising sample, tested at 500 • C for more than 120 h, assured total conversion and no apparent deactivation, demonstrating the stability of the selected formulation. By changing contact time, the dependence of carbon formation rate on space velocity was also investigated.

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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%

“…However, Rh promotes ethanol dehydrogenation with high CO formation (Equations (3) and (6)) [18]. On the contrary, Pt favors CO adsorption on the catalyst surface and affects reducible species on the support, promoting the formation of new active sites in the water gas shift reaction (WGSR) [27,28]. Yet, Pt has a lower capacity to break C-C bonds compared to Rh [29].…”

Section: Introductionmentioning

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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Effect of the interactions between Pt species and ceria on Pt/ceria catalysts for water gas shift: The XPS studies

Cited by 70 publications

References 26 publications

Effects of Platinum and Palladium Metals on Ni/Mg1-xZrxO Catalysts in the CO2 Reforming of Methane

Effects of Platinum and Palladium Metals on Ni/Mg1-xZrxO Catalysts in the CO2 Reforming of Methane

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

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

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