Catalyst Design with Atomic Layer Deposition

O’Neill, Brandon J.; Jackson, David H. K.; Lee, Jechan; Canlas, Christian G.; Stair, Peter C.; Marshall, Christopher L.; Elam, Jeffrey W.; Kuech, T. F.; Dumesic, James A.; Huber, George W.

doi:10.1021/cs501862h

Cited by 675 publications

(621 citation statements)

References 240 publications

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“…Among various catalytic design techniques, [49] ALD has been extensively used to tune properties at the molecular level. [50] ALD allows deposition of thin layers (< 100 nm) with high level of conformality. In comparison, state-ofthe-art catalyst preparation methods that include wet impregnation and deposition precipitation can lead to a mixture of sites, which result in side reactions.…”

Section: Irreversible Deactivation Via Sintering And/or Leaching Of Smentioning

confidence: 99%

Improving Heterogeneous Catalyst Stability for Liquid-phase Biomass Conversion and Reforming

Héroguel

Rozmysłowicz

Luterbacher³

2015

Chimia

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Biomass is a possible renewable alternative to fossil carbon sources. To day, many bio-resources can be converted to direct substitutes or suitable alternatives to fossil-based fuels and chemicals. However, catalyst deactivation under the harsh, often liquid-phase reaction conditions required for biomass treatment is a major obstacle to developing processes that can compete with the petrochemical industry. This review presents recently developed strategies to limit reversible and irreversible catalyst deactivation such as metal sintering and leaching, metal poisoning and support collapse. Methods aiming to increase catalyst lifetime include passivation of low-stability atoms by overcoating, creation of microenvironments hostile to poisons, improvement of metal stability, or reduction of deactivation by process engineering.

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Section: Irreversible Deactivation Via Sintering And/or Leaching Of Smentioning

confidence: 99%

Improving Heterogeneous Catalyst Stability for Liquid-phase Biomass Conversion and Reforming

Héroguel

Rozmysłowicz

Luterbacher³

2015

Chimia

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“…Plasma catalysis is gaining increasing interest for various environmental applications, such as gaseous pollutant removal, the splitting of CO 2 , hydrogen generation and O 3 production [1][2][3][4][5][6][7][8][9]. Plasma catalysis can be regarded as the combination of a plasma with a catalyst, and often results in improved performance, in terms of selectivity and energy efficiency of the process.…”

Section: Introductionmentioning

confidence: 99%

Mode Transition of Filaments in Packed-Bed Dielectric Barrier Discharges

et al. 2018

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Abstract:We investigated the mode transition from volume to surface discharge in a packed bed dielectric barrier discharge reactor by a two-dimensional particle-in-cell/Monte Carlo collision method. The calculations are performed at atmospheric pressure for various driving voltages and for gas mixtures with different N 2 and O 2 compositions. Our results reveal that both a change of the driving voltage and gas mixture can induce mode transition. Upon increasing voltage, a mode transition from hybrid (volume+surface) discharge to pure surface discharge occurs, because the charged species can escape much more easily to the beads and charge the bead surface due to the strong electric field at high driving voltage. This significant surface charging will further enhance the tangential component of the electric field along the dielectric bead surface, yielding surface ionization waves (SIWs). The SIWs will give rise to a high concentration of reactive species on the surface, and thus possibly enhance the surface activity of the beads, which might be of interest for plasma catalysis. Indeed, electron impact excitation and ionization mainly take place near the bead surface. In addition, the propagation speed of SIWs becomes faster with increasing N 2 content in the gas mixture, and slower with increasing O 2 content, due to the loss of electrons by attachment to O 2 molecules. Indeed, the negative O − 2 ion density produced by electron impact attachment is much higher than the electron and positive O + 2 ion density. The different ionization rates between N 2 and O 2 gases will create different amounts of electrons and ions on the dielectric bead surface, which might also have effects in plasma catalysis.

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“…Atomic layer deposition (ALD) originates from a modified version of metal-organic chemical vapor deposition that relies on the self-limiting chemistry of precursors and the interaction between substrates and precursors, and is able to meet the needs of atomic level control and conformal deposition using sequential, self-limiting reaction [104][105][106][107]. ALD, which has emerged as an important technique to fabricate catalysts with atomically precise design and control, has been utilized to deposit ultra-thin metal on graphitized nanocarbon and other types of supports [108][109][110][111].…”

Section: Atomic Layer Deposition Methodsmentioning

confidence: 99%

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

Huang

2017

Sci. China Mater.

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Graphitized nanocarbon materials can be an ideal catalyst support for heterogeneous catalytic systems. Their unique physical and chemical properties, such as large surface area, high adsorption capacity, excellent thermal and mechanical stability, outstanding electronic properties, and tunable porosity, allow the anchoring and dispersion of the active metals. Therefore, currently they are used as the key support material in many catalytic processes. This review summarizes recent relevant applications in supported catalysts that use graphitized nanocarbon as supports for catalytic oxidation, hydrogenation, dehydrogenation, and C-C coupling reactions in liquid-phase and gas-solid phase-reaction systems. The latest developments in specific features derived from the morphology and characteristics of graphitized nanocarbon-supported metal catalysts are highlighted, as well as the differences in the catalytic behavior of graphitized nanocarbon-supported metal catalysts versus other related catalysts. The scientific challenges and opportunities in this field are also discussed. Keywords: nanocarbon materials; graphitized carbon supports; metal catalysts; hetergeneous catalysis INTRODUCTIONCarbon combines its atoms in diverse hybridization states (sp, sp 2 , sp 3 ) to form a variety of polymorphs. These are composed entirely of carbon but have different physical structures and different names, including diamond, graphite, fullerenes, and carbines, among others [1][2][3][4][5]. Because these various and versatile allotropes produce materials with a large range of properties, carbon materials can be used in a number of technological processes, including high-tech catalytic ones [6][7][8][9][10].In heterogeneous catalysis, carbon material plays wellestablished and important roles in a wide range of applications, both as catalyst in its own right and as a unique support material [11][12][13][14][15]. The chemical stability of carbon supports in some specifically aqueous phase biomass conversion surpasses that of metal oxide materials; in addition, carbon materials present other common and key advantages as support materials for catalysis [1,5]. From the point of physical structure, porous carbon can be prepared in different forms (granules, cloth, fibers, pallets, etc.). Due to its chemical properties, carbon structure is resistant to both acidic and basic media. The structure of carbon is stable at high temperature (even above 1023 K under inert atmosphere). The hydrophilic/ hydrophobic nature of carbon can be easily modified. Active metals on the support can be easily reduced. For the purposes of industrial economy and environment, the active phase can be easily recovered. Conventional carbon supports are lower-cost and more easily available than other conventional supports. Although several kinds of carbon materials have been studied, active carbon (AC) [12,[16][17][18][19] and, to a lesser extend, carbon black [20][21][22][23] have long been the most commonly used carbon supports. AC is an amorphous solid prepa...

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Catalyst Design with Atomic Layer Deposition

Cited by 675 publications

References 240 publications

Improving Heterogeneous Catalyst Stability for Liquid-phase Biomass Conversion and Reforming

Improving Heterogeneous Catalyst Stability for Liquid-phase Biomass Conversion and Reforming

Mode Transition of Filaments in Packed-Bed Dielectric Barrier Discharges

Graphitized nanocarbon-supported metal catalysts: synthesis, properties, and applications in heterogeneous catalysis

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