Hydrothermally synthesized CuxO as a catalyst for CO oxidation

Mu Yao Guo; Fangzhou Liu; Jenkin Tsui; Albert A. Voskanyan; Alan Man Ching Ng; Aleksandra B. Djurišić; Wai Kin Chan; Kwong Yu Chan; Changzhong Liao; Kaimin Shih; Charles Surya

doi:10.1039/c4ta06804a

Hydrothermally synthesized Cu_xO as a catalyst for CO oxidation

Mu Yao Guo, Fangzhou Liu, Jenkin Tsui, Albert A. Voskanyan, Alan Man Ching Ng, Aleksandra B. Djurišić, Wai Kin Chan, Kwong Yu Chan, Changzhong Liao, Kaimin Shih, Charles Surya

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

Hydrothermally synthesized Cu_xO exhibited improved performance for CO oxidation compared to the hydrothermally synthesized Cu₂O, as well as commercial CuO nanoparticles. Hydrothermally synthesized Cu_xO predominantly consists of CuO, but it also contains a small contribution from Cu₂O, as well as Cu₂(OH)₃(NO₃) (before annealing). After annealing, only CuO and Cu₂O phases are present, and the T₅₀ value is significantly improved from 179 °C to 149 °C, and the T₅₀ value of annealed hydrothermal Cu_xO remains practically unchanged for 3 catalytic cycles. The improved performance of hydrothermal Cu_xO can be attributed to its composition and surface properties. The ratio of lattice oxygen to surface oxygen (oxygen in surface adsorbates, surface states, and defects) increases after the first CO oxidation reaction for all samples except commercial CuO nanoparticles, which exhibit steady decrease with increased cycling. In addition, pure Cu₂O irreversibly changes to CuO after CO oxidation reaction, but its catalytic performance after the first cycle is significantly improved compared to commercial CuO nanoparticles.

Original language	English
Pages (from-to)	3627-3632
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	3
Issue number	7
DOIs	https://doi.org/10.1039/c4ta06804a
Publication status	Published - Feb 21 2015
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Renewable Energy, Sustainability and the Environment
Materials Science(all)

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10.1039/c4ta06804a

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Hydrothermally synthesized Cu_xO as a catalyst for CO oxidation. / Guo, Mu Yao; Liu, Fangzhou; Tsui, Jenkin; Voskanyan, Albert A.; Ng, Alan Man Ching; Djurišić, Aleksandra B.; Chan, Wai Kin; Chan, Kwong Yu; Liao, Changzhong; Shih, Kaimin; Surya, Charles.

In: Journal of Materials Chemistry A, Vol. 3, No. 7, 21.02.2015, p. 3627-3632.

Research output: Contribution to journal › Article › peer-review

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title = "Hydrothermally synthesized CuxO as a catalyst for CO oxidation",

abstract = "Hydrothermally synthesized CuxO exhibited improved performance for CO oxidation compared to the hydrothermally synthesized Cu2O, as well as commercial CuO nanoparticles. Hydrothermally synthesized CuxO predominantly consists of CuO, but it also contains a small contribution from Cu2O, as well as Cu2(OH)3(NO3) (before annealing). After annealing, only CuO and Cu2O phases are present, and the T50 value is significantly improved from 179 °C to 149 °C, and the T50 value of annealed hydrothermal CuxO remains practically unchanged for 3 catalytic cycles. The improved performance of hydrothermal CuxO can be attributed to its composition and surface properties. The ratio of lattice oxygen to surface oxygen (oxygen in surface adsorbates, surface states, and defects) increases after the first CO oxidation reaction for all samples except commercial CuO nanoparticles, which exhibit steady decrease with increased cycling. In addition, pure Cu2O irreversibly changes to CuO after CO oxidation reaction, but its catalytic performance after the first cycle is significantly improved compared to commercial CuO nanoparticles.",

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AU - Djurišić, Aleksandra B.

AU - Chan, Wai Kin

AU - Chan, Kwong Yu

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AU - Shih, Kaimin

AU - Surya, Charles

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N2 - Hydrothermally synthesized CuxO exhibited improved performance for CO oxidation compared to the hydrothermally synthesized Cu2O, as well as commercial CuO nanoparticles. Hydrothermally synthesized CuxO predominantly consists of CuO, but it also contains a small contribution from Cu2O, as well as Cu2(OH)3(NO3) (before annealing). After annealing, only CuO and Cu2O phases are present, and the T50 value is significantly improved from 179 °C to 149 °C, and the T50 value of annealed hydrothermal CuxO remains practically unchanged for 3 catalytic cycles. The improved performance of hydrothermal CuxO can be attributed to its composition and surface properties. The ratio of lattice oxygen to surface oxygen (oxygen in surface adsorbates, surface states, and defects) increases after the first CO oxidation reaction for all samples except commercial CuO nanoparticles, which exhibit steady decrease with increased cycling. In addition, pure Cu2O irreversibly changes to CuO after CO oxidation reaction, but its catalytic performance after the first cycle is significantly improved compared to commercial CuO nanoparticles.

AB - Hydrothermally synthesized CuxO exhibited improved performance for CO oxidation compared to the hydrothermally synthesized Cu2O, as well as commercial CuO nanoparticles. Hydrothermally synthesized CuxO predominantly consists of CuO, but it also contains a small contribution from Cu2O, as well as Cu2(OH)3(NO3) (before annealing). After annealing, only CuO and Cu2O phases are present, and the T50 value is significantly improved from 179 °C to 149 °C, and the T50 value of annealed hydrothermal CuxO remains practically unchanged for 3 catalytic cycles. The improved performance of hydrothermal CuxO can be attributed to its composition and surface properties. The ratio of lattice oxygen to surface oxygen (oxygen in surface adsorbates, surface states, and defects) increases after the first CO oxidation reaction for all samples except commercial CuO nanoparticles, which exhibit steady decrease with increased cycling. In addition, pure Cu2O irreversibly changes to CuO after CO oxidation reaction, but its catalytic performance after the first cycle is significantly improved compared to commercial CuO nanoparticles.

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