Promotional effects of Cu O on the activity of Cu/ZnO catalyst toward efficient CO oxidation

Sarkodie, Bismark; Hu, Yanjie; Bi, Weihong; Jiang, Jiechao; Li, Chunzhong

doi:10.1016/j.apsusc.2021.149241

Cited by 27 publications

(11 citation statements)

References 46 publications

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“…Aerosol-based synthesis is a heterogeneous formation of solid particles (dispersoid) in the gas phase (medium). Among the commonly used aerosol-based synthetic approaches, spray pyrolysis, a droplet-to-particle route, is widely used to fabricate functional nanoparticles. ,,− In principle, aerosolized droplets of precursor solution are first created by a spray device (e.g., atomizer, nebulizer, or electrospray ionizer) . The droplets of precursor solutions are exposed to a high temperature in the gas phase for controlled evaporation of solvent from the droplets, resulting in crystallization of the solute to form solid particles. , Subsequently, the dried precursor particle is produced in a high-temperature thermal treatment in the aerosol phase (e.g., temperature-programmed flow reactor or flame), by which the precursor converts into functional nanoparticles. , …”

Section: Aerosol Synthesis Of Hybrid Nanoparticlesmentioning

confidence: 99%

“…The oxidation of carbon monoxide (CO + 1/2O 2 → CO 2 ) has attracted great interest as it is the key reaction in the automotive emission control process and could be applied in fuel cells. , The copper-ceria catalyst is an attractive candidate to effectively reduce the light-off temperature of CO oxidation, and the interfacial catalysis has been studied extensively. ,,, In a general CO oxidation process (Scheme a), CO species first adsorb to the CuO x surface and react with its lattice oxygen to form CO 2 . The oxygen vacancies generated at the surface of CuO x are further replenished by O 2 , completing a catalytic CO oxidation cycle. , Through the incorporation of CeO 2 , the Cu–Ce–O interfaces provide additional lattice oxygen, forming new active sites for the reduction of CuO species and the subsequent oxidation of CO. ,, …”

Section: Applications In Interfacial Catalysis Using Aerosol Phase-sy...mentioning

confidence: 99%

“…4,27 The copper-ceria catalyst is an attractive candidate to effectively reduce the light-off temperature of CO oxidation, and the interfacial catalysis has been studied extensively. 4,17,19,27 In a general CO oxidation process (Scheme 2a), CO species first adsorb to the CuO x surface and react with its lattice oxygen to form CO 2 . 19 The oxygen vacancies generated at the surface of CuO x are further replenished by O 2 , completing a catalytic CO oxidation cycle.…”

Section: Using Aerosol Phase-synthesized Nanoparticlesmentioning

confidence: 99%

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Design of Aerosol Nanoparticles for Interfacial Catalysis

Law

Tsai

2022

Langmuir

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Interest in multifunctional nanoparticles is currently rising due to the increasing demand in green energy and environmental applications. The aerosol-based synthetic route emerges as a promising method for enabling the fabrication of multifunctional nanoparticles in a continuous and scalable manner. Meanwhile, interfacial catalysis is receiving great attention to enhance the performance of chemical reactions. In this regard, the utilization of aerosol nanoparticles is highly beneficial to the catalysis field by the creation of strong metal−support−promoter interactions for promoting interfacial catalysis. In this Perspective, aerosol-based synthesis of hybrid nanoparticles is briefly discussed. In addition, the interfacial catalysis of CO oxidation, methane combustion, CO 2 hydrogenation, and dry reforming of methane are discussed to provide fundamental insights and concepts for the rational design of nanocatalysts with efficient interfaces.

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Section: Aerosol Synthesis Of Hybrid Nanoparticlesmentioning

confidence: 99%

Section: Applications In Interfacial Catalysis Using Aerosol Phase-sy...mentioning

confidence: 99%

Section: Using Aerosol Phase-synthesized Nanoparticlesmentioning

confidence: 99%

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Design of Aerosol Nanoparticles for Interfacial Catalysis

Law

Tsai

2022

Langmuir

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“…Therefore, how to further enhance the content of interfacial oxygen vacancies and build more interfacial active sites are the key points for the Au‐based catalyst design. Recently, Cu/ZnO displays superior effect in CO oxidation system because lattice‐stacking dislocations expose nanoparticles to more defect sites on the surface 28 . Cu has also been proven to enter the ZnO lattice through the thermal treatment process, forming more oxygen vacancies, and interfacial structures 29–31 .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Cu/ZnO displays superior effect in CO oxidation system because lattice-stacking dislocations expose nanoparticles to more defect sites on the surface. 28 Cu has also been proven to enter the ZnO lattice through the thermal treatment process, forming more oxygen vacancies, and interfacial structures. [29][30][31] Consequently, the introduction of Cu into the Au-ZnO interface may realize the increase of interfacial active sites and oxygen vacancies.…”

mentioning

confidence: 99%

Insight into the selective oxidation mechanism of glycerol to 1,3‐dihydroxyacetoneoverAuCu–ZnOinterface

Zhao

Liu

et al. 2022

AIChE Journal

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Directional regulation of polyol oxidation selectivity by constructing active sites with specific structure is a critical yet challenging problem. Herein, the specific Au‐based catalyst with efficient Au–Cu–ZnO interfacial active sites was successfully designed to promote selective oxidation of glycerol to 1,3‐dihydroxyacetone under mild conditions. X‐ray absorption spectroscopy revealed that the increased electron transfer between Au and Cu increases the content of Au+, resulting in the higher catalytic activity (turnover frequency: 402.5 h−1). Meanwhile, small AuCu alloy nanoparticles (ca., 2.7 nm) could be inserted into the ZnO lattice with the formation of Au(Cu)–O–Zn linkages, resulting in the enrichment of interfacial oxygen vacancies. These interfacial oxygen vacancies induce the activation and adsorption of the secondary hydroxyl group of glycerol on the interfacial active sites, improving the selectivity of 1,3‐dihydroxyacetone (83.4%). Furthermore, in situ Fourier transform infrared, structure‐dependent kinetics and density functional theory calculation demonstrated that Au–Cu–ZnO interfacial active sites could enhance the participation of OH* and oxygen vacancies in activating the OH and CH bonds, respectively, promoting the improvement of the catalytic performance. The outcome of this work offers new insights for the rational design of high effective catalyst for the selective oxidation of polyol.

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