Fe-Containing Magnesium Aluminate Support for Stability and Carbon Control during Methane Reforming

Theofanidis, Stavros Alexandros; Galvita, Vladimir; Poelman, Hilde; Dharanipragada, Naga Venkata Ranga Aditya; Longo, Alessandro; Meledina, Maria; Tendeloo, Gustaaf Van; Detavernier, Christophe; Marin, Guy

doi:10.1021/acscatal.8b01039

Cited by 76 publications

(121 citation statements)

References 68 publications

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“…Homogeneous growth of high‐density SWNT arrays owes to highly active catalyst nanoparticles, which are sinter‐resistant thus highly dispersed on the entire substrate during CVD. AFM image shown in Figure 2 a indicated the as‐annealed substrate loaded with magnesium and iron precursors remained almost the same morphology as pure sapphire and no nanoparticles formed on it, in accordance with impregnation and exsolution mechanism of Fe 3+ on alumina [10, 11c,d] . Besides, magnesium also “disappeared” on sapphire surface, which will be elaborated in the next section.…”

Section: Figuresupporting

confidence: 58%

Growth of Homogeneous High‐Density Horizontal SWNT Arrays on Sapphire through a Magnesium‐Assisted Catalyst Anchoring Strategy

et al. 2021

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In‐situ growth of high‐density single‐walled carbon nanotube (SWNT) arrays with homogeneity is highly desirable for integrated circuits. However, disastrous migration and aggregation of catalyst nanoparticles on substrate has greatly limited the area of as‐grown SWNT arrays. Herein, we develop a magnesium‐assisted catalyst anchoring strategy to restrain catalyst nanoparticles sintering on substrate. Magnesium modification ameliorates sapphire surface by high temperature solid reaction and thus provides a stronger metal‐support interaction (SMSI). Hereby, we realize the direct growth of high‐density SWNT arrays that fully cover an entire 10×10 mm2 substrate with the local highest density of ≈110 tubes μm−1 using iron as catalyst. This strategy was also proven universal when employing solid carbide catalysts.

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Section: Figuresupporting

confidence: 58%

Growth of Homogeneous High‐Density Horizontal SWNT Arrays on Sapphire through a Magnesium‐Assisted Catalyst Anchoring Strategy

et al. 2021

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“…Due to its environmental and industrial relevance, research effort has focused on the development of active, stable, and cost-effective DRM catalysts. In that regard, supported NiFe catalysts have proved effective in meeting these demands [153][154][155][156][157][158][159][160]. In an effort to improve the DRM activity by downsizing the NPs, Margossian et al [161] applied a colloidal strategy in the preparation of uniform NiFe/Mg(Al)O catalysts with selected Ni-and Fe loadings.…”

Section: Reforming Reactionsmentioning

confidence: 99%

“…At lower temperatures, NiFe alloy formation was more profound. Under DRM conditions, the constituent Ni 0 is the active site for DRM, while neighboring Fe forms FeO, which allows for the decoking of Ni [153,158,159].…”

Section: Reforming Reactionsmentioning

confidence: 99%

Designing Nanoparticles and Nanoalloys for Gas-Phase Catalysis with Controlled Surface Reactivity Using Colloidal Synthesis and Atomic Layer Deposition

et al. 2020

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Supported nanoparticles are commonly applied in heterogeneous catalysis. The catalytic performance of these solid catalysts is, for a given support, dependent on the nanoparticle size, shape, and composition, thus necessitating synthesis techniques that allow for preparing these materials with fine control over those properties. Such control can be exploited to deconvolute their effects on the catalyst’s performance, which is the basis for knowledge-driven catalyst design. In this regard, bottom-up synthesis procedures based on colloidal chemistry or atomic layer deposition (ALD) have proven successful in achieving the desired level of control for a variety of fundamental studies. This review aims to give an account of recent progress made in the two aforementioned synthesis techniques for the application of controlled catalytic materials in gas-phase catalysis. For each technique, the focus goes to mono- and bimetallic materials, as well as to recent efforts in enhancing their performance by embedding colloidal templates in porous oxide phases or by the deposition of oxide overlayers via ALD. As a recent extension to the latter, the concept of area-selective ALD for advanced atomic-scale catalyst design is discussed.

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“…One of the reactions is dry reforming of methane (DRM), in which two greenhouse gases (CH 4 and CO 2 ) are converted to valuable syngas (H 2 and CO) . Ni catalysts for DRM, also true for other reactions, are prepared by various methods, e. g., impregnation, co‐precipitation, sol‐gel, polymerization, hydrothermal,, and more recently plasma treatment,, and atomic layered deposition ,. A reduction process usually follows to obtain active metal phase .…”

Section: Introductionmentioning

confidence: 99%

Controlling the Reduction Extent for Metal Catalysts

Cheng

Ren

et al. 2019

ChemistrySelect

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Metal catalysts have been used extensively in addressing energy and environmental issues. A reduction process is often needed to activate these catalysts. However, there is a lack of techniques to accurately control this process, thus the chemical composition of the catalysts is usually unclear. Ni‐based catalysts are among the most commonly used due to their effectiveness and low costs. In this work, we use the reduction of a Ni/Al2O3 catalyst used in dry reforming of methane to demonstrate a novel technique that well controls the reduction extent of metal catalysts. We achieve this goal by using IR spectroscopy to monitor and quantify the reduction product, H2O, in the process. Specifically, we measure a full and a partial H2O production kinetics, and subsequently develop an algorithm to control the reduction extent of the Ni catalyst in a wide range. This algorithm is proved effective. The technique can be applied generally to any pretreatment process that involves IR measurable gases and its wide application would greatly promote the fundamental catalyst structure‐performance investigation.

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Fe-Containing Magnesium Aluminate Support for Stability and Carbon Control during Methane Reforming

Cited by 76 publications

References 68 publications

Growth of Homogeneous High‐Density Horizontal SWNT Arrays on Sapphire through a Magnesium‐Assisted Catalyst Anchoring Strategy

Growth of Homogeneous High‐Density Horizontal SWNT Arrays on Sapphire through a Magnesium‐Assisted Catalyst Anchoring Strategy

Designing Nanoparticles and Nanoalloys for Gas-Phase Catalysis with Controlled Surface Reactivity Using Colloidal Synthesis and Atomic Layer Deposition

Controlling the Reduction Extent for Metal Catalysts

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