The Enhanced Catalytic Performance and Stability of Rh/γ-Al2O3 Catalyst Synthesized by Atomic Layer Deposition (ALD) for Methane Dry Reforming

The present work explores the technical feasibility of passivating a Co/γ-Al2O3 catalyst by atomic layer deposition (ALD) to reduce deactivation rate during Fischer–Tropsch synthesis (FTS). Three samples of the reference catalyst were passivated using different numbers of ALD cycles (3, 6 and 10). Characterization results revealed that a shell of the passivating agent (Al2O3) grew around catalyst particles. This shell did not affect the properties of passivated samples below 10 cycles, in which catalyst reduction was hindered. Catalytic tests at 50% CO conversion evidenced that 3 and 6 ALD cycles increased catalyst stability without significantly affecting the catalytic performance, whereas 10 cycles caused blockage of the active phase that led to a strong decrease of catalytic activity. Catalyst deactivation modelling and tests at 60% CO conversion served to conclude that 3 to 6 ALD cycles reduced Co/γ-Al2O3 deactivation, so that the technical feasibility of this technique was proven in FTS.

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Atomic Layer Deposition for Preparation of Highly Efficient Catalysts for Dry Reforming of Methane

Catalysts ◽

10.3390/catal9030266 ◽

2019 ◽

Vol 9 (3) ◽

pp. 266 ◽

Cited By ~ 1

Author(s):

Soong Kim ◽

Byeong Cha ◽

Shahid Saqlain ◽

Hyun Seo ◽

Young Kim

Keyword(s):

Atomic Layer Deposition ◽

Heterogeneous Catalysts ◽

Chemical Properties ◽

Atomic Layer ◽

Dry Reforming ◽

Dry Reforming Of Methane ◽

High Catalytic Activity ◽

Term Operation ◽

Layer Deposition

In this article, the structural and chemical properties of heterogeneous catalysts prepared by atomic layer deposition (ALD) are discussed. Oxide shells can be deposited on metal particles, forming shell/core type catalysts, while metal nanoparticles are incorporated into the deep inner parts of mesoporous supporting materials using ALD. Both structures were used as catalysts for the dry reforming of methane (DRM) reaction, which converts CO2 and CH4 into CO and H2. These ALD-prepared catalysts are not only highly initially active for the DRM reaction but are also stable for long-term operation. The origins of the high catalytic activity and stability of the ALD-prepared catalysts are thoroughly discussed.

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Surface Modification of Catalysts via Atomic Layer Deposition for Pollutants Elimination

Catalysts ◽

10.3390/catal10111298 ◽

2020 ◽

Vol 10 (11) ◽

pp. 1298

Author(s):

Xiaofeng Wang ◽

Zhe Zhao ◽

Chengcheng Zhang ◽

Qingbo Li ◽

Xinhua Liang

Keyword(s):

Surface Modification ◽

Atomic Layer Deposition ◽

Environmental Remediation ◽

Particle Deposition ◽

Nanostructured Catalysts ◽

Atomic Layer ◽

Catalytic Performance ◽

Selective Deposition ◽

Conformal Coating ◽

Layer Deposition

In recent years, atomic layer deposition (ALD) is widely used for surface modification of materials to improve the catalytic performance for removing pollutants, e.g., CO, hydrocarbons, heavy metal ions, and organic pollutants, and much progress has been achieved. In this review, we summarize the recent development of ALD applications in environmental remediation from the perspective of surface modification approaches, including conformal coating, uniform particle deposition, and area-selective deposition. Through the ALD conformal coating, the activity of photocatalysts improved. Uniform particle deposition is used to prepare nanostructured catalysts via ALD for removal of air pollutions and dyes. Area-selective deposition is adopted to cover the specific defects on the surface of materials and synthesize bimetallic catalysts to remove CO and other contaminations. In addition, the design strategy of catalysts and shortcomings of current studies are discussed in each section. At last, this review points out some potential research trends and comes up with a few routes to further improve the performance of catalysts via ALD surface modification and deeper investigate the ALD reaction mechanisms.

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High-Performance Catalytic Four-Channel Hollow Fibers with Highly Dispersed Nickel Nanoparticles Prepared by Atomic Layer Deposition for Dry Reforming of Methane

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.1c03705 ◽

2021 ◽

Author(s):

Baitang Jin ◽

Shiguang Li ◽

Xinhua Liang

Keyword(s):

Atomic Layer Deposition ◽

High Performance ◽

Nickel Nanoparticles ◽

Atomic Layer ◽

Dry Reforming ◽

Hollow Fibers ◽

Dry Reforming Of Methane ◽

Layer Deposition ◽

Highly Dispersed

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Al2O3-Coated Ni/CeO2 nanoparticles as coke-resistant catalyst for dry reforming of methane

Catalysis Science & Technology ◽

10.1039/d0cy01615b ◽

2020 ◽

Vol 10 (24) ◽

pp. 8283-8294

Author(s):

Euiseob Yang ◽

Eonu Nam ◽

Jihyeon Lee ◽

Hojeong Lee ◽

Eun Duck Park ◽

...

Keyword(s):

Atomic Layer Deposition ◽

Catalyst Deactivation ◽

Atomic Layer ◽

Dry Reforming ◽

Ceo2 Nanoparticles ◽

Dry Reforming Of Methane ◽

Ni Nanoparticles ◽

Layer Deposition

To mitigate catalyst deactivation during the dry reforming of methane, Ni/CeO2 catalysts composed of monodisperse Ni nanoparticles supported on CeO2 nanorods are designed and coated with Al2O3 layers by atomic layer deposition.

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

Molecules ◽

10.3390/molecules25163735 ◽

2020 ◽

Vol 25 (16) ◽

pp. 3735

Author(s):

Valentijn De Coster ◽

Hilde Poelman ◽

Jolien Dendooven ◽

Christophe Detavernier ◽

Vladimir V. Galvita

Keyword(s):

Atomic Layer Deposition ◽

Gas Phase ◽

Atomic Layer ◽

Catalytic Performance ◽

Surface Reactivity ◽

Catalyst Design ◽

Atomic Scale ◽

Colloidal Synthesis ◽

Synthesis Techniques ◽

Layer Deposition

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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