Hydrothermally synthesized Cu<sub>x</sub>O as a catalyst for CO oxidation

Guo, Minzhe; Liu, Fangzhou; Tsui, J; Voskanyan, Albert A.; Ng, Alan Man Ching; Djurišić, Aleksandra B.; Chan, Wai Kin; Chan, Kwong‐Yu; Liao, Changzhong; Shih, Kaimin; Surya, C.

doi:10.1039/c4ta06804a

Cited by 31 publications

(15 citation statements)

References 32 publications

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“…It has been suggested that catalysis over copper oxides is significantly influenced by the surface states and defects . Consequently, a range of successful reports exist for the successful formation of supported or unsupported copper oxides with different morphologies . Since the composition of oxides can affect the surface states and defects and thereby the catalytic properties, methods for manipulating these factors should be developed.…”

Section: Introductionsupporting

confidence: 86%

“…[23] Consequently,arange of successful reports exist for the successfulf ormation of supported or unsupported coppero xides with differentm orphologies. [24][25][26] Since the composition of oxidesc an affect the surface states and defects and thereby the catalytic properties, methods for manipulating these factors should be developed. To the best of our knowledge, to date there has been no successful attempt for ac ontrolled synthesis of supported copper oxide species.…”

Section: Introductionmentioning

confidence: 99%

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A Convenient Surfactant‐Mediated Hydrothermal Approach to Control Supported Copper Oxide Species for Catalytic Upgrading of Glucose to Lactic Acid

Choudhary

Ebitani

2015

ChemNanoMat

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Herein, we discuss a convenient surfactant‐mediated hydrothermal approach to control supported copper oxide species in a highly reproducible way and investigate their effect on the catalytic upgrading of glucose to lactic acid. Careful characterization using XRD, Raman spectroscopy, and temperature programmed reduction (TPR) studies revealed paramelaconite (Cu4O3) loaded on MgO as the catalytically active species. It was also found that the cuprite (Cu2O) phase can be prepared in the presence of N,N‐dimethyldodecylamine N‐oxide (DDAO) while the tenorite (CuO) phase was obtained in the absence of surfactant. The use of cetyltrimethylammonium bromide (CTAB) selectively gave the Cu4O3 phase as the supported species. The above‐mentioned systematic approach demonstrates that substantial improvement in the catalytic activity (or other properties) can be achieved by careful selection of the synthetic conditions for generation of desired Cu species through a simple and inexpensive preparation route.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

A Convenient Surfactant‐Mediated Hydrothermal Approach to Control Supported Copper Oxide Species for Catalytic Upgrading of Glucose to Lactic Acid

Choudhary

Ebitani

2015

ChemNanoMat

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“…In this regard, it is extremelyu rgent to develop new nanocatalystsw ith ah igh catalytic activity.T he catalytic oxidation of CO is at ypical models ystemu sed to understandh eterogeneous catalysis, therefore, as eries of transition metal (e.g.,M n, Co, Cu, Fe, Ce) oxidesa nd their mixtures have been investigated extensively for CO oxidation. [3][4][5][6][7][8] These studies on the design and synthesis of catalysts are divided into two types:p owder catalysts and monolithic catalysts. For powderc atalysts, Co 3 O 4 and its mixtures have emerged as attractive alternative catalysts because of their low cost, environmental benignity,a nd relatively high catalytic activity for low-temperature CO oxidation, in contrast to precious-metal catalysts.…”

Section: Introductionmentioning

confidence: 99%

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Zhang

et al. 2018

ChemCatChem

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Herein, a facile strategy for the in situ growth of a Co3O4‐based precursor with unique hierarchical architectures oriented diagonal or perpendicular to Ni surfaces is reported. This strategy to prepare grafted ZIF‐67@Co3O4 and MOF‐199@Co3O4 precursor structures is based on a simple hydrothermal synthesis method to obtain the Co3O4 precursor and the subsequent in situ growth of ZIF‐67 and MOF‐199, respectively. The morphologies of the Co3O4 products can be tailored by controlling the solvent polarity and concentration of precipitants. CO is chosen as a probe molecule to evaluate the catalytic performance of the as‐synthesized Co3O4‐based oxide catalysts, and the structure–activity relationships are confirmed by using TEM, H2 temperature‐programmed reduction, X‐ray photoelectron spectroscopy, Raman spectroscopy and in situ Raman spectroscopy, and extended X‐ray absorption fine structure analysis. These analysis results demonstrate that irislike Co3O4 exhibits a high catalytic activity for CO oxidation and contains an abundance of surface defect sites (Co3+ species) to result in an excellent low‐temperature reducibility, oxygen vacancies and unsaturated chemical bonds on the surface. Moreover, we used in situ Raman spectroscopy to record the structural transformation of Co3O4 directly during the reaction, which confirmed that CO oxidation on the surface of Co3O4 can proceed through the Langmuir–Hinshelwood mechanism (<200 °C) and the Mars–van Krevelen mechanism (>200 °C).

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“…This suggested that composite interfaces formed by the CO oxidation reaction and the loaded Cu nanoparticles on the surfaces of pure Cu 2 O improved the ability of oxygen chemisorption. Hence, a correlation can be established between T 50 and OCA, where larger O CA corresponded to lower T 50 , revealing that O CA plays a critical role in the CO oxidation reactions 31…”

Section: Resultsmentioning

confidence: 92%

Cu–Cu₂O Heterogeneous Architecture for the Enhanced CO Catalytic Oxidation

Kong

et al. 2020

Adv Materials Inter

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surface of metal-metal oxidation can be oxidized. [12][13][14] Experimentally, relatively limited amount of group metals attached on catalyst surface present a tremendous potential in determining the active structure and composition during the CO oxidation. [15,16] Although noble metals (such as Au, Ag, and Ru) exhibit highly CO oxidation activities, [17][18][19] the rare quantity and high cost restrict their application. In contrast, transition metal oxides are of interest as the most suitable substitutes owing to the low cost and abundance. Among them, copper (Cu) and Cu-based materials are basically featured for CO oxidation, owning to the multiple oxidation states, such as cuprous oxide (Cu 2 O) and copper oxide (CuO). [20][21][22] Huang et al. have separately studied the CO oxidation activities over Cu, Cu 2 O, and CuO, and found that Cu 2 O exhibits higher activities than the other two copper species due to the propensity of Cu 2 O toward valence variations is easy to release or seize oxygen molecule. [23] Penkala et al. have prepared CuO-Ca 2 Fe 2 O 5 catalysts and studied the enhanced CO oxidation performance. [24] However, few appeared reports have concerned about the CO catalytic activity of Cu-Cu 2 O interface in oxygen atmospheres. From the previous theoretical perspective, the role of the loading particles focuses on the variations in work functions, the polarization at the interface of hybrid material, and the regulating and controlling of oxygen vacancy. [17,25] The lack of Cu-Cu 2 O heterogeneous interface and molecular understanding during the catalytic process remain unclear.Herein, we report a facile two-step synthesis approach for monodispersed Cu-Cu 2 O heterogeneous particles (HPs), where Cu nanoparticles on the surface were in situ reduced from octahedral Cu 2 O particles. Cu-Cu 2 O HPs were found to exhibit better catalytic performance than pure Cu 2 O particles during the first cycle of CO oxidation. In addition, after the first run of CO catalytic reaction, composite CuO-Cu 2 O interfaces are formed on the surface of Cu-Cu 2 O HPs, which further increased the conversion of CO oxidation efficiencies. The density functional theory (DFT) simulations indicate that due to loaded Cu nanoparticles, the heterogeneous architecture promotes the catalytic reaction under both the Eley-Rideal mechanism (key step: O 2 dissociation) as well as Langmuir-Hinshelwood mechanism. In Heterogeneous architecture of Cu 2 O-based composite has exhibited beneficial effort in the CO oxidation, due to the low cost and the multiple oxidation states. In this work, Cu-Cu 2 O heterogeneous particles (HPs) comprising uniformly distributed Cu nanoparticles anchored on the Cu 2 O surface are synthesized by in situ reduction reaction. Comparing with the pure Cu 2 O particles, Cu-Cu 2 O HPs exhibit enhanced and stable catalytic performance during CO oxidation. Moreover, both the transformation of interface and the role of loaded Cu nanoparticle at a molecular level are investigated to analyze the promotion, suggesting that ...

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Hydrothermally synthesized Cu_xO 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.

Cited by 31 publications

References 32 publications

A Convenient Surfactant‐Mediated Hydrothermal Approach to Control Supported Copper Oxide Species for Catalytic Upgrading of Glucose to Lactic Acid

A Convenient Surfactant‐Mediated Hydrothermal Approach to Control Supported Copper Oxide Species for Catalytic Upgrading of Glucose to Lactic Acid

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Cu–Cu₂O Heterogeneous Architecture for the Enhanced CO Catalytic Oxidation

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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.

Cited by 31 publications

References 32 publications

A Convenient Surfactant‐Mediated Hydrothermal Approach to Control Supported Copper Oxide Species for Catalytic Upgrading of Glucose to Lactic Acid

A Convenient Surfactant‐Mediated Hydrothermal Approach to Control Supported Copper Oxide Species for Catalytic Upgrading of Glucose to Lactic Acid

Integrated Cobalt Oxide Based Nanoarray Catalysts with Hierarchical Architectures: In Situ Raman Spectroscopy Investigation on the Carbon Monoxide Reaction Mechanism

Cu–Cu2O Heterogeneous Architecture for the Enhanced CO Catalytic Oxidation

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Hydrothermally synthesized Cu_xO as a catalyst for CO oxidation

Cu–Cu₂O Heterogeneous Architecture for the Enhanced CO Catalytic Oxidation