Indium-doped Co 3 O 4  nanorods for catalytic oxidation of CO and C 3 H 6  towards diesel exhaust

Ma, Lei; Seo, Chang Yup; Chen, Xiaoyin; Sun, Kai; Schwank, Johannes W.

doi:10.1016/j.apcatb.2017.10.001

Cited by 182 publications

(85 citation statements)

References 48 publications

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“…Therefore, considerable work has been devoted to non‐noble metal oxides, such as MnO 2 , Co 3 O 4 , CeO 2 , and CuO, to develop promising candidates for CO oxidation ,. Particularly, a fascinating class of nanomaterials constituting from Co 3 O 4 has been the subject of intensive research, due to their high oxygen mobility with lower Co−O bonding energies and stronger adsorption energies for reacting molecules ,,. Despite of these attractive features, most of the developed Co 3 O 4 ‐based materials lacked of well‐defined morphology, showing undesirable performance in CO oxidation .…”

Section: Introductionmentioning

confidence: 99%

Hollow‐Co₃O₄@Co₃O₄@SiO₂ Multi‐Yolk‐Double‐Shell Nanoreactors for Highly Efficient CO Oxidation

et al. 2018

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The engineering of highly active, stable, and inexpensive catalysts for CO oxidation reaction through the modulations of morphology and structure is desirable but remains a great challenge. Herein, we reported the rational design of novel hollow‐Co3O4@Co3O4@SiO2 multi‐yolk‐double‐shell nanoreactors by using a two‐step annealing recipe employing core‐shelled ZIF‐67@SiO2 as a precursor. The unique structures of the multi‐yolk‐double‐shell and hollow interior of Co3O4 endowed the materials with promising properties of sufficient active interfacial sites, porous structures, efficient oxygen delivery capacity, and more oxygen vacancies, which were beneficial for CO oxidation. Consequently, the H−Co3O4@Co3O4@SiO2(35)‐250 nanoreactor exhibited outstanding catalytic performance, achieving complete CO conversion at 100 °C, which was far exceeding that of hollow Co3O4 NPs derived from pure ZIF‐67 and also solid Co3O4@SiO2(35)‐250 with a complete conversion of CO at 190 and 230 °C, respectively, and even outperformed most of the reported Co3O4‐based catalysts. Moreover, H−Co3O4@Co3O4@SiO2(35)‐250 could continuously work for 28 h without any deactivation and maintain 93 % CO conversion within 34 h at 100 °C. The proposed strategy of designing and fabricating novel structures offers great opportunities in developing highly active hollow metal oxide‐based nanoreactors for a variety of advanced applications.

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Section: Introductionmentioning

confidence: 99%

Hollow‐Co₃O₄@Co₃O₄@SiO₂ Multi‐Yolk‐Double‐Shell Nanoreactors for Highly Efficient CO Oxidation

et al. 2018

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“…The low temperature peak (below 515 °C) could be related to the two‐reduction steps of Co 3 O 4 to CoO and then to metallic Co. While the reduction temperature peak at higher temperatutres was ascribed to the reduction of cobalt species in Co 2 AlO 4 and/or CoAl 2 O 4 to metallic cobalt, respectively . Samples with low Nd loading (Nd 0.1 Co 0.8 Al 0.2 and Nd 0.25 Co 0.8 Al 0.2 ) showed similar redox properties as Co 0.8 Al 0.2 .…”

Section: Resultsmentioning

confidence: 94%

“…While the reduction temperature peak at higher temperatutres was ascribed to the reduction of cobalt species in Co 2 AlO 4 and/or CoAl 2 O 4 to metallic cobalt, respectively. [11,24,[44][45][46] Samples with low Nd loading (Nd 0.1 Co 0.8 Al 0.2 and Nd 0.25 Co 0.8 Al 0.2 ) showed similar redox properties as Co 0.8 Al 0.2 . On the other hand, for Nd 0.5 Co 0.8 Al 0.2 the first peak shifted to higher temperatures (from 466 to 506°C) and the second peak to lower temperatures (from 807 to 786°C) in comparison to those of Co 0.8 Al 0.2 .…”

Section: Resultsmentioning

confidence: 96%

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Jabłońska

Nocuń

et al. 2019

ChemCatChem

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Cu−Al and Co−Al (M/Al=0.8/0.2, molar ratio; M=Cu or Co) mixed metal oxides showed a moderate activity in N2O decomposition (deN2O) with full conversion at about 500–550 °C. Addition of Nd modified the physico‐chemical and catalytic properties of both Cu−Al and Co−Al materials, though an optimal Nd loading was required. The addition of Nd in Cu0.8Al0.2 and Co0.8Al0.2 with Nd/Co(Cu)/Al = 0.5/0.8/0.2 molar ratio, improved significantly their catalytic activity. In particular, the temperatures needed for full N2O conversion were 100 °C lower than those of the bare materials. Furthermore, the most active Nd0.5Co0.8Al0.2 catalyst exhibited a stable 60 % N2O conversion at 450 °C for 50 h in presence of NO (200 ppm), O2 (20,000 ppm) and H2O (2500 ppm). The enhancement in the activity of both Cu‐ and Co‐containing materials was related to the formation of CuNd2O4 for Nd0.5Cu0.8Al0.2 and NdCoO3 for Nd0.5Co0.8Al0.2. The presence of CuNd2O4 or NdCoO3 accounted for changes in redox properties, e. g., easier reduction or faster release of oxygen, and in turn an increased catalyst activity in deN2O. The investigation of rare earth‐based catalysts for deN2O is limited in the scientific literature, while a comprehensive understanding of the involved active species may facilitate a knowledge‐based catalyst optimization.

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“…Figure S2 illustrates the dynamic change of carboxylic species and bicarbonates on Co 3 O 4 À H and Co 3 O 4 À C by calculating the ratio of corresponding peak areas. There is an obvious accumulation of surface carbonates on the surface of Co 3 O 4 À C compared with Co 3 O 4 À H. The accumulation of surface carbonates may cover the active sites [56,57] and hinder the reaction, which has a negative effect on catalytic performance. The CO 2 -TPD after surface reaction with C 3 H 8 was conducted to further confirm the results.…”

Section: In-situ Driftmentioning

confidence: 99%

Facet‐Dependent Activity of Co₃O₄ Catalyst for C₃H₈ Combustion

et al. 2019

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Clarifying the facet‐dependent activity of Co3O4 towards C3H8 combustion is of great importance to have a deep understanding of reaction mechanism and develop highly active Co3O4 based catalysts for light hydrocarbon combustion. In this work, four different Co3O4 nanocatalysts which dominantly exposed {100}, {111}, {110} and {112} facets, respectively, were synthesized via hydrothermal method and further tested in C3H8 combustion. The catalytic activity of different crystal planes varied as the order of {111}>{100}>{110}>{112}. The Co3O4 catalyst with {111} facets exhibited the best catalytic performance with T50 and T90 as low as 209 and 239 °C, respectively. DRIFT and DFT calculations revealed that the facile activation of C−H bond on Co3O4 {111} planes is responsible for the high activity. Moreover, the higher activity of lattice oxygens and easy activation of gas phase oxygen could also contribute to the excellent catalytic performance.

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Indium-doped Co 3 O 4 nanorods for catalytic oxidation of CO and C 3 H 6 towards diesel exhaust

Cited by 182 publications

References 48 publications

Hollow‐Co₃O₄@Co₃O₄@SiO₂ Multi‐Yolk‐Double‐Shell Nanoreactors for Highly Efficient CO Oxidation

Hollow‐Co₃O₄@Co₃O₄@SiO₂ Multi‐Yolk‐Double‐Shell Nanoreactors for Highly Efficient CO Oxidation

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Facet‐Dependent Activity of Co₃O₄ Catalyst for C₃H₈ Combustion

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Indium-doped Co 3 O 4 nanorods for catalytic oxidation of CO and C 3 H 6 towards diesel exhaust

Cited by 182 publications

References 48 publications

Hollow‐Co3O4@Co3O4@SiO2 Multi‐Yolk‐Double‐Shell Nanoreactors for Highly Efficient CO Oxidation

Hollow‐Co3O4@Co3O4@SiO2 Multi‐Yolk‐Double‐Shell Nanoreactors for Highly Efficient CO Oxidation

Effect of Neodymium on the Physico‐chemical Properties and N2O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Facet‐Dependent Activity of Co3O4 Catalyst for C3H8 Combustion

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Hollow‐Co₃O₄@Co₃O₄@SiO₂ Multi‐Yolk‐Double‐Shell Nanoreactors for Highly Efficient CO Oxidation

Hollow‐Co₃O₄@Co₃O₄@SiO₂ Multi‐Yolk‐Double‐Shell Nanoreactors for Highly Efficient CO Oxidation

Effect of Neodymium on the Physico‐chemical Properties and N₂O Decomposition Activity of Co(Cu)−Al Mixed Oxides

Facet‐Dependent Activity of Co₃O₄ Catalyst for C₃H₈ Combustion