Thermally Stable RuOx–CeO2 Nanofiber Catalysts for Low-Temperature CO Oxidation

Liu, Zhongqi; Lu, Yang; Confer, Matthew P.; Cui, Hao; Li, Junhao; Li, Yudong; Wang, Yifan; Street, Shane C.; Wujcik, Evan K.; Wang, Ruigang

doi:10.1021/acsanm.0c01815

Cited by 43 publications

(33 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The P 3 and P 3 ′ peaks near 470 °C were generally considered to correspond to the reduction of surface CeO 2 . 28 The smaller area of the P 3 peak also verified the above conclusion; that is, more surface CeO 2 in the 0.5Au/Co 3 O 4 -CeO 2 -500 °C sample was reduced at low temperature (P 1 and P 1 ′ peaks).…”

Section: Methodssupporting

confidence: 67%

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Duan

Hao

et al. 2020

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

CO oxidation at room temperature has become a hot research topic due to its scientific and environmental applications, and nanoscale catalysts are considered to be a bridge to this goal. In this study, a three-dimensional (3D) porous nanosheet/nanorod woven Au/Co 3 O 4 -CeO 2 catalyst with a large specific surface area was prepared by dealloying Al−Ce−Co−Au precursor alloy ribbons combined with calcination. The experimental results revealed that the Au nanoparticles were loaded on both Co 3 O 4 nanosheets and CeO 2 nanorods. The optimized Au/ Co 3 O 4 -CeO 2 catalyst can completely convert CO at near room temperature (30 °C) under a high space velocity (60 000 h −1 ), exhibiting a significant improvement compared to Au/CeO 2 , and the catalytic activity does not exhibit any decrease tendency even after 125 h of continuous performance in feed gas with a very high vapor concentration (5 × 10 4 to 2 × 10 5 ppm), which implied the extreme stability and water vapor resistance of the catalyst. Systematic characterizations revealed that the improvements in catalytic activity can be attributed to the small amount of nanoscale Co 3 O 4 added, which significantly increased the oxygen vacancies and surface active oxygen species in the sample. Moreover, the rough interfaces formed by the interweaving of nanosheets and nanorods also enhanced the strong metal−support interactions, thereby increasing the concentration of more active Au δ+ species. In addition, the process of CO catalytic oxidation on samples and the CO oxidation mechanism under anaerobic conditions were investigated by in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS), paving a feasible pathway for the rational design of highperformance nanoscale catalysts. KEYWORDS: melt-spun Al−Ce−Co−Au ribbon, Au/Co 3 O 4 -CeO 2 catalyst, CO oxidation, water vapor resistant, room-temperature catalyst

show abstract

Section: Methodssupporting

confidence: 67%

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Duan

Hao

et al. 2020

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…When Ru 0.05 Ce 0.95 O 2 was reduced at 400 °C (Figure 1B), the lattice parameter was increased to 0.5405 nm, which is likely a result of the partial reduction of Ce 4+ (r Ce4+ =0.094 nm) to Ce 3+ (r Ce3+ =0.1143 nm) [17] . Interestingly, no characteristics of Ru species were detected, indicating the Ru species was highly dispersed in the Ru 0.05 Ce 0.95 O 2 solid solution even after reduction at 400 °C.…”

Section: Resultsmentioning

confidence: 99%

“…This could be a result of the smaller Ru 4+ size (0.062 nm) than Ce 4+ (0.094 nm) [16] . The reduced lattice parameter is an indicator of successful incorporation of Ru in the lattice of CeO 2 to form solid solution [17] . In the Ru/CeO 2 sample prepared by impregnation, a tiny peak of RuO 2 (011) was observed at 2θ=35°, indicating the formation of the RuO 2 particles.…”

Section: Resultsmentioning

confidence: 99%

Ru_0.05Ce_0.95O₂ Solid Solution Derived Ru Catalyst Enables Selective Hydrodeoxygenation of m‐Cresol to Toluene

Cui

et al. 2021

ChemCatChem

View full text Add to dashboard Cite

Selective hydrodeoxygenation (HDO) of biomass lignin‐derived phenolic compounds to aromatics is a demanding reaction. Oxophilic Ru based catalysts can catalyze direct deoxygenation but suffer from competing C−C hydrogenolysis to CH4 at 350 °C and hydrogenation of phenyl ring at 250 °C under atmospheric pressure. In this work, a solid solution Ru0.05Ce0.95O2 catalyst was hydrothermally synthesized, characterized and tested for HDO of m‐cresol. The Ru species is highly dispersed in the solid solution as isolated atoms and/or subnanometer clusters as a result of strong Ru−O−Ce interaction, and the catalyst shows high concentration of oxygen vacancies. In contrast to nonselective Ru/SiO2, Ru0.05Ce0.95O2 selectively catalyzes deoxygenation to toluene while significantly inhibits C−C hydrogenolysis and hydrogenation. Moreover, the overall intrinsic HDO rate on Ru0.05Ce0.95O2 is 2.2 and 8.8 times higher than those on Ru/CeO2 and Ru/SiO2, respectively. The Ru−OV−Ce sites were proposed to be the active sites for deoxygenation. Inhibition of C−C hydrogenolysis and phenyl hydrogenation can be ascribed to the reduced size of the Ru ensembles due to the strong interaction in the solid solution.

show abstract

“…As an example, Figure 2 depicts the electrocatalysis of electrospun RuO x -doped CeO 2 nanofibers to the oxidation of carbon monoxide, as investigated by Liu et al [62]. This depiction shows how the lattice structure of the CeO 2 nanofibers aligns with and without the Ru-doping.…”

Section: Electrocatalytic Activitymentioning

confidence: 98%

“…When a nanofiber material, or any other material, shows catalytic activity for an analyte of interest, the nanofiber material has potential to be used as an electrocatalytic sensor for that analyte. Due to the uniquely electroactive characteristics of nanofibers, derived from their large and adjustable active surface area, there is potential for their use in a variety of electrocatalytic applications [62][63][64][65][66][67]. The electrocatalytic behavior of nanofibers can also be tuned by altering their size or configuring their structure, changing the sensitivity and selectivity towards a target analyte [68][69][70].…”

Section: Electrocatalytic Activitymentioning

confidence: 99%

Perspective on Nanofiber Electrochemical Sensors: Design of Relative Selectivity Experiments

2021

View full text Add to dashboard Cite

The use of nanofibers creates the ability for non-enzymatic sensing in various applications and greatly improves the sensitivity, speed, and accuracy of electrochemical sensors for a wide variety of analytes. The high surface area to volume ratio of the fibers as well as their high porosity, even when compared to other common nanostructures, allows for enhanced electrocatalytic, adsorptive, and analyte-specific recognition mechanisms. Nanofibers have the potential to rival and replace materials used in electrochemical sensing. As more types of nanofibers are developed and tested for new applications, more consistent and refined selectivity experiments are needed. We applied this idea in a review of interferant control experiments and real sample analyses. The goal of this review is to provide guidelines for acceptable nanofiber sensor selectivity experiments with considerations for electrocatalytic, adsorptive, and analyte-specific recognition mechanisms. The intended presented review and guidelines will be of particular use to junior researchers designing their first control experiments, but could be used as a reference for anyone designing selectivity experiments for non-enzymatic sensors including nanofibers. We indicate the importance of testing both interferants in complex media and mechanistic interferants in the selectivity analysis of newly developed nanofiber sensor surfaces.

show abstract

Thermally Stable RuO_x–CeO₂ Nanofiber Catalysts for Low-Temperature CO Oxidation

Cited by 43 publications

References 61 publications

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Ru_0.05Ce_0.95O₂ Solid Solution Derived Ru Catalyst Enables Selective Hydrodeoxygenation of m‐Cresol to Toluene

Perspective on Nanofiber Electrochemical Sensors: Design of Relative Selectivity Experiments

Contact Info

Product

Resources

About

Thermally Stable RuOx–CeO2 Nanofiber Catalysts for Low-Temperature CO Oxidation

Cited by 43 publications

References 61 publications

Co3O4 Nanosheet/Au Nanoparticle/CeO2 Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Co3O4 Nanosheet/Au Nanoparticle/CeO2 Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Ru0.05Ce0.95O2 Solid Solution Derived Ru Catalyst Enables Selective Hydrodeoxygenation of m‐Cresol to Toluene

Perspective on Nanofiber Electrochemical Sensors: Design of Relative Selectivity Experiments

Contact Info

Product

Resources

About

Thermally Stable RuO_x–CeO₂ Nanofiber Catalysts for Low-Temperature CO Oxidation

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Co₃O₄ Nanosheet/Au Nanoparticle/CeO₂ Nanorod Composites as Catalysts for CO Oxidation at Room Temperature

Ru_0.05Ce_0.95O₂ Solid Solution Derived Ru Catalyst Enables Selective Hydrodeoxygenation of m‐Cresol to Toluene