Highly active and stable Ni/Y2Zr2O7 catalysts for methane steam reforming: On the nature and effective preparation method of the pyrochlore support

Fang, Xiuzhong; Zhang, Xianhua; Guo, Yao; Chen, Mengmeng; Liu, Wenming; Xu, Xianglan; Peng, Honggen; Gao, Zhixian; Li, Changqing

doi:10.1016/j.ijhydene.2016.04.038

Cited by 49 publications

(10 citation statements)

References 34 publications

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“…The synthesized pyrochlore oxides exhibit relatively low specific surface areas (17.92–27.22 m 2 /g), consistent with results reported in previous studies [12,20]. One possible explanation to the poor surface areas can be that a high synthesis temperature (>700 °C) is required to form a pyrochlore phase.…”

Section: Resultssupporting

confidence: 89%

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Wang

Cui

et al. 2018

Materials

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A novel active Ca-Co dually-doping pyrochlore oxide La2−xCaxSn2−yCoyO7 catalyst was synthesized by the sol-gel method for catalytic oxidation of soot particulates. The microstructure, atomic valence, reduction, and adsorption performance were investigated by X-ray powder diffraction (XRD), scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), H2-TPR (temperature-programmed reduction), and in situ diffuse reflection infrared Fourier transformed (DRIFTS) techniques. Temperature programmed oxidation (TPO) tests were performed with the mixture of soot-catalyst under tight contact conditions to evaluate the catalytic activity for soot combustion. Synergetic effect between Ca and Co improved the structure and redox properties of the solids, increased the surface oxygen vacancies, and provided a suitable electropositivity for oxide, directly resulting in the decreased ignition temperature for catalyzed soot oxidation as low as 317 °C. The presence of NO in O2 further promoted soot oxidation over the catalysts with the ignition temperature decreased to about 300 °C. The DRIFTS results reveal that decomposition of less stable surface nitrites may account for NO2 formation in the ignition period of soot combustion, which thus participate in the auxiliary combustion process.

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Section: Resultssupporting

confidence: 89%

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Wang

Cui

et al. 2018

Materials

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“…Additionally, there is a growing interest to explore emerging materials such as high entropy oxides, composite pyrochlore oxides and flourite structured oxides, which exhibit high chemical stability and also exhibit catalytic activity at high temperatures. [170][171][172][173][174] The above examples suggests that the new liquid feedstock route could open new vistas for electrolyser-relevant coatings. In the context of liquid feedstock thermal spraying, it is also relevant to point out that a growing number of reports on suspension and solution precursor spraying using HVOF torches (termed s-HVOF) present further possibilities to create novel coatings with unique microstructures.…”

Section: Advanced Thermal Spray Methodsmentioning

confidence: 99%

“…All of the above chemistries are also amenable for SPS deposition. Additionally, there is a growing interest to explore emerging materials such as high entropy oxides, composite pyrochlore oxides and flourite structured oxides, which exhibit high chemical stability and also exhibit catalytic activity at high temperatures [170–174] …”

Section: Considerations For Enhanced Hydrogen Productionmentioning

confidence: 99%

Application of Thermal Spray Coatings in Electrolysers for Hydrogen Production: Advances, Challenges, and Opportunities

et al. 2022

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Thermal spray coatings have the advantage of providing thick and functional coatings from a range of engineering materials. The associated coating processes provide good control of coating thickness, morphology, microstructure, pore size and porosity, and residual strain in the coatings through selection of suitable process parameters for any coating material of interest. This review consolidates scarce literature on thermally sprayed components which are critical and vital constituents (e.g., catalysts (anode/cathode), solid electrolyte, and transport layer, including corrosion-prone parts such as bipolar plates) of the water splitting electrolysis process for hydrogen production. The research shows that there is a gap in thermally sprayed feedstock material selection strategy as well as in addressing modelling needs that can be crucial to advancing applications exploiting their catalytic and corrosion-resistant properties to split water for hydrogen production. Due to readily scalable production enabled by thermal spray techniques, this manufacturing route bears potential to dominate the sustainable electrolyser technologies in the future. While the well-established thermal spray coating variants may have certain limitations in the manner they are currently practiced, deployment of both conventional and novel thermal spray approaches (suspension, solution, hybrid) is clearly promising for targeted development of electrolysers.

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“…The MSR catalytic activity tests highlighted the best performance of 3%Ru/ZnLaAlO 4 , both in terms of CH 4 conversion and coke formation. Fang et al showed the effect of the preparation method of the Y 2 Zr 2 O 7 support on the activity of Ni/Y 2 Zr 2 O 7 in the MSR reaction [21]. The Y 2 Zr 2 O 7 pyrochlore supports were prepared by co-precipitation (CP), glycine-nitrate combustion (GNC) and hydrothermal (HT) methods and impregnated with nickel nitrate to prepare the three catalysts.…”

Section: Monometallic Catalystsmentioning

confidence: 99%

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

2020

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Hydrogen is an important raw material in chemical industries, and the steam reforming of light hydrocarbons (such as methane) is the most used process for its production. In this process, the use of a catalyst is mandatory and, if compared to precious metal-based catalysts, Ni-based catalysts assure an acceptable high activity and a lower cost. The aim of a distributed hydrogen production, for example, through an on-site type hydrogen station, is only reachable if a novel reforming system is developed, with some unique properties that are not present in the large-scale reforming system. These properties include, among the others, (i) daily startup and shutdown (DSS) operation ability, (ii) rapid response to load fluctuation, (iii) compactness of device, and (iv) excellent thermal exchange. In this sense, the catalyst has an important role. There is vast amount of information in the literature regarding the performance of catalysts in methane steam reforming. In this short review, an overview on the most recent advances in Ni based catalysts for methane steam reforming is given, also regarding the use of innovative structured catalysts.

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Highly active and stable Ni/Y2Zr2O7 catalysts for methane steam reforming: On the nature and effective preparation method of the pyrochlore support

Cited by 49 publications

References 34 publications

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Catalytic Oxidation of Soot on a Novel Active Ca-Co Dually-Doped Lanthanum Tin Pyrochlore Oxide

Application of Thermal Spray Coatings in Electrolysers for Hydrogen Production: Advances, Challenges, and Opportunities

A Short Review on Ni Based Catalysts and Related Engineering Issues for Methane Steam Reforming

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