Doctoral Dissertations

Xiaofeng Wang

Keywords and Phrases

Adsorption; Atomic layer deposition; Catalysis; Hydrogenation; Nanoparticles; Single atom

Abstract

"Atomic layer deposition (ALD) has been widely used for thin film coating and metal nanoparticles (NPs) preparation. In this report, the applications of ALD prepared nanostructured materials in catalysis were examined.

Highly dispersed Pt monometallic catalysts with different substrates and multi-walled carbon nanotubes (MWCNTs) supported Pt-Co bimetallic catalysts were synthesized by ALD for selective hydrogenation of α, β-unsaturated aldehydes to unsaturated alcohols (UA). Pt/MWCNTs showed the highest selectivity of UA in selective hydrogenation of citral, as compared to Pt/SiO2, Pt/ALD-Al2O3, and Pt/γ-Al2O3. After adding Co, the highest selectivity was achieved with high conversion in hydrogenation of both cinnamaldehyde and citral over an optimized Pt-Co/MWCNTs catalyst.

Highly dispersed Pt-Co/MWCNTs bimetallic catalysts were also used for hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF) reaction. High yield of DMF ( > 90%) was achieved in hydrogenolysis of HMF over an optimized Pt-Co/MWCNTs catalyst after 8 hr of reaction time under mild conditions.

Fe NPs and single atoms were deposited on various substrates via ALD. Fe/SiO2 NPs showed a high activity in CO oxidation reaction with a long-term stability at high temperature. The TiO2 NPs deposited with Fe single atoms showed the highest activity and had an up to six-fold photocatalytic activity enhancement over pure TiO2. CeO2 ALD and ZrO2 ALD were also applied on TiO2 to boost the photocatalytic activity of TiO2, and both two methods improved the photocatalytic efficiency of TiO2 significantly"--Abstract, page iv.

Advisor(s)

Liang, Xinhua

Committee Member(s)

Ludlow, Douglas K.
Rezaei, Fateme
Wang, Jee-Ching
Shi, Honglan

Department(s)

Chemical and Biochemical Engineering

Degree Name

Ph. D. in Chemical Engineering

Sponsor(s)

National Science Foundation (U.S.)
Petroleum Research Fund

Comments

This work was supported in part by the National Science Foundation (NSF-CBET 1402122) and American Chemical Society Petroleum Research Fund.

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Selective hydrogenation of citral over supported Pt catalysts: Insight into support effects
  • Atomic layer deposited Pt-Co bimetallic catalysts for selective hydrogenation of α, β-unsaturated aldehydes to unsaturated alcohols
  • Hydrogenolysis of 5-hydroxymethylfurfural to 2,5-dimethylfuran over supported Pt-Co bimetallic catalyst under mild conditions
  • Synthesis of highly dispersed and highly stable supported Au-Pt bimetallic catalysts by a two-step method
  • Significant photocatalytic performance enhancement of TiO2 by CeO2 atomic layer deposition
  • Significant improvement of TiO2 photocatalytic activity through a controllable ZrO2 deposition
  • Highly active and stable Fe/SiO2 catalyst synthesized by atomic layer deposition for CO oxidation
  • Supported iron single atoms synthesized via atomic layer deposition

Pagination

xvii, 251 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2018 Xiaofeng Wang, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11729

Electronic OCLC #

1164805583

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