Modification of Pd/CeO2 catalyst by Atomic Layer Deposition of ZrO2

Onn, Tzia Ming; Arroyo‐Ramírez, Lisandra; Monai, Matteo; Oh, Tae-Sik; Talati, Meghavi; Fornasiero, Paolo; Gorte, Raymond J.; Khader, Mahmoud M.

doi:10.1016/j.apcatb.2015.12.028

Cited by 42 publications

(33 citation statements)

References 33 publications

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“…Inorganics 2017, 5, 65 2 of 9 ceria powders were dramatically stabilized against sintering to temperatures up to 1073 K [18]. Whereas the crystallite size of an unmodified ceria powder increased from 18 to 32 nm when the calcination temperature increased from 673 to 1073 K, the crystallite size of the ALD-modified ceria was unchanged by this treatment.…”

Section: Resultsmentioning

confidence: 98%

“…One of the most interesting observations from the previous ALD study of ZrO 2 on CeO 2 was that a 0.4 nm thick film, having a thickness that is smaller than the 0.52-nm lattice parameter of cubic zirconia, was able to stabilize the surface area and crystallite size of CeO 2 to high temperatures [18]. To better understand the effect of ALD films, we here investigated the influence of CeO 2 and ZrO 2 films on a ZrO 2 substrate as a function of film thickness.…”

Section: Resultsmentioning

confidence: 99%

“…Film growth rates were determined from changes in the sample mass using an electronic scale with a precision of 0.1 mg. Sensitivity was not a problem because a simple calculation shows that a uniform, 0.1 nm thick CeO 2 film on 84 m 2 /g ZrO 2 will increase the sample mass by 6% [18]. ZrO 2 samples modified by ALD will be referred to by the species deposited and the number of ALD cycles (e.g., a sample with 20 ALD cycles of CeO 2 is referred to as 20 CeO 2 /ZrO 2 ).…”

Section: Discussionmentioning

confidence: 99%

“…In an attempt to take advantage of these interactions on high-surface-area catalysts, our laboratory recently investigated 0.4 nm conformal zirconia films on ceria powders using atomic layer deposition (ALD) [18]. In ALD, a substrate powder is first allowed to react with an organometallic precursor to a monolayer coverage, after which the adsorbed precursor is oxidized in a separate step.…”

Section: Introductionmentioning

confidence: 99%

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Stabilization of ZrO2 Powders via ALD of CeO2 and ZrO2

et al. 2017

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ZrO 2 powders were modified by atomic layer deposition (ALD) with CeO 2 and ZrO 2 , using Ce(TMHD) 4 and Zr(TMHD) 4 as the precursors, in order to determine the effect of ALD films on the structure, surface area, and catalytic properties of the ZrO 2 . Growth rates were measured gravimetrically and found to be 0.017 nm/cycle for CeO 2 and 0.031 nm/cycle for ZrO 2 . The addition of 20 ALD cycles of either CeO 2 or ZrO 2 was found to stabilize the surface area of the ZrO 2 powder following calcination to 1073 K and to suppress the tetragonal-to-monoclinic transition. Shrinkage of ZrO 2 wafers was also suppressed by the ALD films. When used as a support for Pd in CO oxidation, the CeO 2 -modified materials significantly enhanced rates due to interactions between the Pd and the CeO 2 . Potential applications for modifying catalyst supports using ALD are discussed.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stabilization of ZrO2 Powders via ALD of CeO2 and ZrO2

et al. 2017

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“…Among various synthesis methods, atomic layer deposition (ALD) has been recently developed as an effective method to synthesize composite catalysts. [8][9][10][11][12][13][14] ALD is based on successive and alternative surface reactions from gas phase to fabricate thin films and overlayers in the nanometer range. So far, significant number of elements and their oxides can be synthesized via ALD.…”

Section: Introductionmentioning

confidence: 99%

Review Article: Catalysts design and synthesis via selective atomic layer deposition

Cao

Cai

Liu

et al. 2017

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

103

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Tailoring catalysts with atomic level control over active sites and composite structures is of great importance for advanced catalysis. This review focuses on the recent development of area selective atomic layer deposition (ALD) methods in composite catalysts design and synthesis. By adjusting and optimizing the area selective ALD processes, several catalytic structures are developed, including core shell structures, discontinuous overcoating structures, and embedded structures. The detailed synthesis strategies for these designed structures are reviewed, where the related selective approaches are highlighted and analyzed. In addition, the catalytic performance of such structures, including activity, selectivity, and stability, is discussed. Finally, a summary and outlook of area selective ALD for catalysts synthesis and applications is given.

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Combining Deep Learning and Compressed Sensing Methods for the 3D Characterization of Ultra‐Thin Epitaxial Layers Grown on Controlled‐Shape Nano‐Oxides

Grzonka

Marqueses-Rodríguez

Fernández-García

et al. 2023

Advanced Intelligent Systems

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Using a nanostructured platform (a controlled‐shape nano‐oxide) and conventional wet impregnation techniques, powder‐type materials have been prepared in which atomically thin surface layers are deposited under very mild conditions. More importantly, an advanced methodology, combining energy dispersive X‐ray spectroscopy‐scanning transmission electron tomography (STEM‐EDX ET) and deep learning denoising techniques, has been developed for the 3D compositional characterization of these unique nanosystems. The complex case of LaOx‐coated CeO2 nanocubes is illustrated. For these, aberration corrected 2D STEM‐EDX evidence that ceria nanocubes become covered with a 2–4 atom‐thick layer of a La, Ce‐mixed oxide with spatially varying composition. However, STEM‐EDX ET reveals that this layer distributes unevenly, patching most of the available nanocube surface. The large flexibility and spread availability of the involved synthetic techniques enables, using the tools here developed, a wide exploration of the wealth of questions and applications of these intriguing, atomically thin, surface oxide phases.

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Modification of Pd/CeO2 catalyst by Atomic Layer Deposition of ZrO2

Cited by 42 publications

References 33 publications

Stabilization of ZrO2 Powders via ALD of CeO2 and ZrO2

Stabilization of ZrO2 Powders via ALD of CeO2 and ZrO2

Review Article: Catalysts design and synthesis via selective atomic layer deposition

Combining Deep Learning and Compressed Sensing Methods for the 3D Characterization of Ultra‐Thin Epitaxial Layers Grown on Controlled‐Shape Nano‐Oxides

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