Three-dimensional ordered mesoporous cobalt oxides: Highly active catalysts for the oxidation of toluene and methanol

Xia, Yunsheng; Dai, Hongxing; Jiang, Haiyan; Zhang, Lei

doi:10.1016/j.catcom.2010.07.005

Cited by 155 publications

(61 citation statements)

References 21 publications

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“…Considering that the reducibility of a metal oxide catalyst is an important factor influencing its related catalytic performance in redox- involving reactions [20], herein, H 2 -TPR experiments were performed to investigate the reducibility of Co 3 O 4 catalysts. The TPR profiles are presented in Fig.…”

Section: Reducibility and Aciditymentioning

confidence: 99%

“…For example, Dai's group found that mesoporous manganese and cobalt oxides exhibited better performance for the catalytic combustion of toluene/methanol/CO than their bulk counterparts [15,19,20]. Additionally, porous Co 3 O 4 materials, synthesized by hydrothermal or microemulsion methods, facilitated the catalytic oxidation of toluene at relatively low temperatures [21].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Zhang

Zhong

et al. 2018

Applied Catalysis A: General

174

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A B S T R A C TConsidering the harmful effects of volatile organic compounds (VOCs) on the atmosphere and public health, the search for proper catalytic materials for the effective catalytic elimination of VOCs remains one of the most pressing issues in the environmental field. In this study, a series of mesoporous Co 3 O 4 -n (n = 0.00, 0.0001, 0.01, 0.05, 0.10, 1.00, representing the concentration of HNO 3 aqueous solution) catalysts were fabricated by the acid treatment of Co 3 O 4 that was previously prepared via a hydroxycarbonate precipitation method (Co 3 O 4 -P). The catalytic performances of the prepared catalysts were evaluated for the model reaction of toluene oxidation. An obvious enhancement of catalytic activity in the reaction was achieved over the acid-treated Co 3 O 4 catalysts using lower HNO 3 concentrations, with Co 3 O 4 -0.01 exhibiting the optimum catalytic activity (T 90 = 225°C, 15°C lower than that of Co 3 O 4 -P), excellent catalytic durability under dry conditions and a high regeneration capability under humid conditions. Benefitting from the dilute acid treatment, the Co 3 O 4 -n (n = 0.01, 0.05, 0.10) catalysts presented higher specific surface areas, more weak acidic sites and higher abundances of surface Co 2+ and O ads species, which were regarded as the key factors responsible for their enhanced catalytic activities.

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Section: Reducibility and Aciditymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Zhang

Zhong

et al. 2018

Applied Catalysis A: General

174

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“…However, bulk Co 3 O 4 usually possesses a low surface area (*20 m 2 /g) which is unfavorable to its applications either as a catalyst or as a catalyst support. Mesoporous Co 3 O 4 , on the other hand, possessing the advantages of large surface areas ([100 m 2 /g) and tunable pore structures, has attracted much attention both in material science and in catalysis [10][11][12][13][14][15]. It has been shown that mesoporous Co 3 O 4 exhibited much better catalytic performance than bulk Co 3 O 4 in CO oxidation [15,16] and in VOC removal [13].…”

Section: Introductionmentioning

confidence: 99%

Nanocasting Synthesis of Mesostructured Co3O4 via a Supercritical CO2 Deposition Method and the Catalytic Performance for CO Oxidation

et al. 2011

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We demonstrate a supercritical CO 2 (scCO 2 ) deposition method to synthesize mesostructured Co 3 O 4 with crystalline walls using SBA-15 as the hard template. By variation of the scCO 2 pressure, randomly organized nanorods or a highly ordered mesoporous structure of Co 3 O 4 is obtained after only one filling operation. The catalytic tests show that the randomly organized Co 3 O 4 nanorods display excellent activity for CO oxidation with the complete conversion of CO even at room temperature, while neither the ordered mesoporous nor bulk Co 3 O 4 is active at this low-temperature, demonstrating the important role of Co 3 O 4 morphology in catalysis.

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“…Compared to bulk samples, the presence of the 3D-ordered mesoporous structure is favorable for the diffusion of the reactant molecules to the active sites [18,19]. Therefore, the ordered mesoporous structure was more beneficial for o-xylene oxidation.…”

Section: Betmentioning

confidence: 93%

“…Ordered mesoporous Co 3 O 4 was fabricated by some groups using different silica templates, such as KIT-5, SBA-15, SBA-16, KIT-6, and forming different replica mesoporous structures ((2d-hexagonal P6mm) (bicontinuous cubic Ia3d) (Im3n)) [11,[14][15][16][17][18]. It was shown that the three-dimensional cubic Ia3d mesoporous structure had a more open porous system than other mesostructures, facilitating the absorption and diffusion of the VOC molecules during the catalytic oxidation of short-chain VOCs [13,18,19]. Due to their unique physicochemical properties, ordered mesoporous transition metal oxides have been directly used as catalysts for the oxidation reaction and also used as the supports for noble metals [13].…”

Section: Introductionmentioning

confidence: 99%

Ordered mesoporous and bulk Co3O4 supported Pd catalysts for catalytic oxidation of o-xylene

Wang

Zhang

et al. 2015

Catalysis Today

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a b s t r a c tOrdered mesoporous Co 3 O 4 (3D) and the bulk counterpart Co 3 O 4 (B) were prepared by a nanocasting route and precipitation method, respectively. Pd was next loaded on both of them by an impregnation method. All catalysts were tested for the total oxidation of o-xylene in the temperature range of 150-300 • C. Mesoporous Co 3 O 4 (3D) exhibited better activity than Co 3 O 4 (B), and Pd addition further improved the catalytic activity of both the mesoporous and bulk Co 3 O 4 . The BET and TEM results indicated that the mesoporous catalysts had uniform channel dimensions and the mesostructure was little affected by Pd addition. The TPR and XPS data indicated that Pd was much more exposed on the surface of Co 3 O 4 (3D) than that of Co 3 O 4 (B). TPD results showed that Pd/Co 3 O 4 (3DL) could activate the oxygen species more easily than Pd/Co 3 O 4 (BL). Therefore, Pd/Co 3 O 4 (3DL) presented the best activity among the four catalysts and achieved 90% conversion of 150 ppm o-xylene at 249 • C at a space velocity of 60,000 mL g −1 h −1 .

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Three-dimensional ordered mesoporous cobalt oxides: Highly active catalysts for the oxidation of toluene and methanol

Cited by 155 publications

References 21 publications

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Nanocasting Synthesis of Mesostructured Co3O4 via a Supercritical CO2 Deposition Method and the Catalytic Performance for CO Oxidation

Ordered mesoporous and bulk Co3O4 supported Pd catalysts for catalytic oxidation of o-xylene

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