Design of stable Ni/ZrO2 catalysts for dry reforming of methane

Lou, Yu; Steib, Matthias; Zhang, Qi; Tiefenbacher, Konrad; Horváth, Anita; Jentys, Andreas; Liu, Yue; Lercher, Johannes A.

doi:10.1016/j.jcat.2017.10.009

Cited by 94 publications

(64 citation statements)

References 56 publications

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“…Obviously, two weight loss were observed on the TG profiles with different temperature zone, representing two different kind of carbon deposition. The first type of carbon deposition eliminated at 625 °C is related to capsuling carbon, and another kind of carbon deposition centered over 670 °C exhibits a better thermostability, probably caused by the strong interaction between carbon deposition and SiO 2 support, and which would hardly affect the catalytic stability. It is worth noting that the capsuling carbon is absent from Ni‐9 and Ni‐12 catalyst, and that means Ni/SiO 2 catalyst with small Ni size exhibiting an excellent resistance for the generation of capsuling carbon.…”

Section: Resultsmentioning

confidence: 99%

A Study on the Effect of pH Value of Impregnation Solution in Nickel Catalyst Preparation for Methane Dry Reforming Reaction

Cheng

et al. 2019

ChemistrySelect

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The nickel particle size, distribution and interaction with support are crucial to the catalytic performance in dry reforming of methane reaction (DRM). Despite numerous literatures on dry reforming catalysis, the effect of solution pH on the catalytic performance is not well studied. Herein, we designed a series of Ni/SiO 2 catalysts with different Ni particle sizes. The Ni particle size was controlled with altering the pH of the Ni nitrate solution via the addition of HNO 3 or NH 4 OH. X-ray diffraction (XRD) revealed that NH 4 OH promoted Ni/SiO 2 catalysts present smaller NiO nanoparticles, and enhanced metal-support interaction was evidenced from X-ray photoelectron spectra (XPS) and H 2 temperature-programmed reduc-tion (H 2 -TPR) analyses. In addition, according to thermogravimetric analysis and differential scanning calorimetry (TG-DSC) and transmission electron microscopy (TEM) results, the spent catalysts produced less carbon deposition and maintained Ni nanoparticles in smaller size after DRM reaction. Catalysts with nearly uniform and small particle size demonstrated a satisfying resistance to aggregation and carbon deposition, while realizing a high CH 4 , CO 2 and C total conversion (74.5, 83.7 and 79.7%, respectively). The present study provides a simple but effective way to change the metal-support interaction and metal particle size.

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Section: Resultsmentioning

confidence: 99%

A Study on the Effect of pH Value of Impregnation Solution in Nickel Catalyst Preparation for Methane Dry Reforming Reaction

Cheng

et al. 2019

ChemistrySelect

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“…The metal-support interaction is essential in order to strengthen the resistibility of Ni catalysts to carbon deposits [11][12][13][14]. Tuning the size of Ni particles, as well as the selection of appropriate supports that will promote better metal-support interaction and consequently prevent the sintering of Ni, are still challenges [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Performance of Lanthanum Promoted Ni/ZrO2 for Carbon Dioxide Reforming of Methane

et al. 2020

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Nickel catalysts supported on zirconium oxide and modified by various amounts of lanthanum with 10, 15, and 20 wt.% were synthesized for CO2 reforming of methane. The effect of La2O3 as a promoter on the stability of the catalyst, the amount of carbon formed, and the ratio of H2 to CO were investigated. In this study, we observed that promoting the catalyst with La2O3 enhanced catalyst activities. The conversions of the feed, i.e., methane and carbon dioxide, were in the order 10La2O3 > 15La2O3 > 20La2O3 > 0La2O3, with the highest conversions being about 60% and 70% for both CH4 and CO2 respectively. Brunauer–Emmett–Teller (BET) analysis showed that the surface area of the catalysts decreased slightly with increasing La2O3 doping. We observed that 10% La2O3 doping had the highest specific surface area (21.6 m2/g) and the least for the un-promoted sample. The higher surface areas of the promoted samples relative to the reference catalyst is an indication of the concentration of the metals at the mouths of the pores of the support. XRD analysis identified the different phases available, which ranged from NiO species to the monoclinic and tetragonal phases of ZrO2. Temperature programmed reduction (TPR) analysis showed that the addition of La2O3 lowered the activation temperature needed for the promoted catalysts. The structural changes in the morphology of the fresh catalyst were revealed by microscopic analysis. The elemental compositions of the catalyst, synthesized through energy dispersive X-ray analysis, were virtually the same as the calculated amount used for the synthesis. The thermogravimetric analysis (TGA) of spent catalysts showed that the La2O3 loading of 10 wt.% contributed to the gasification of carbon deposits and hence gave about 1% weight-loss after a reaction time of 7.5 h at 700 °C.

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“…high reaction endothermicity (ΔH = +247.4 kJ/mol) and catalyst instability to carbonization [19][20], as a result of which they lose their effectivity. Nickel catalysts are the most widely studied for these reactions, their main advantage over other transition metals is higher activity in the DRM reaction and low cost [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Dry Reforming of Methane on Carriers and Oxide Catalysts to Synthesis-Gas

Dossumov

Yergaziyeva

Myltykbayeva

et al. 2018

Eurasian Chem. Tech. J.

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The catalytic activity of carriers: θ‒Al2O3, γ‒Al2O3, 5A, 4A, 3A and 13X and the oxides of metals of variable valency ‒ NiO, La2O3, CuO, MoO3, MgO, V2O5, WO3, CoO, Cr2O3, ZnO, ZrO2, CeO2, Fe2O3, supported on the effective carrier γ‒Al2O3 by the method of capillary impregnation of the support with solutions of nitric salts of metals were investigated in the process of carbon dioxide conversion of methane (DRM). The optimal technological regimes for the process were: the reaction temperature -800 °C, the space velocity of the initial reactants ‒ 1500 h-1 with a methane to carbon dioxide ratio equal to 1. It was found that among the studied catalysts the highest activity is shown by the NiO/γ‒Al2O3 catalyst, where the yields of hydrogen and carbon monoxide reaches 45.4 and 42.4% by volume, respectively, when methane conversion is 89%. The XRF method showed that the content of alumina and nickel oxide after the reaction remained unchanged at 96.7 and 3.0%, respectively. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), small angle X-ray scattering (XRS) determined that nickel-containing NiO/γ‒Al2O3 catalyst form nickel nanoparticles (6.4‒10 and 50‒150 nm) and a uniform their distribution on the surface of the carrier takes place. These physical chemical characteristics have a positive effect on the activity of NiO/γ‒Al2O3 catalyst in the process of carbon dioxide conversion of methane to synthesis gas.

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Design of stable Ni/ZrO2 catalysts for dry reforming of methane

Cited by 94 publications

References 56 publications

A Study on the Effect of pH Value of Impregnation Solution in Nickel Catalyst Preparation for Methane Dry Reforming Reaction

A Study on the Effect of pH Value of Impregnation Solution in Nickel Catalyst Preparation for Methane Dry Reforming Reaction

Catalytic Performance of Lanthanum Promoted Ni/ZrO2 for Carbon Dioxide Reforming of Methane

Dry Reforming of Methane on Carriers and Oxide Catalysts to Synthesis-Gas

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