Deep oxidation of volatile organic compounds using ordered cobalt oxides prepared by a nanocasting route

Garcı́a, Tomás; Agouram, Saïd; Sánchez-Royo, Juan F.; Murillo, R.; Mastral, A.M.; Aranda, Asunción; Vázquez, Isaac Amigo; Dejoz, Ana; Solsona, Benjamín

doi:10.1016/j.apcata.2010.07.018

Cited by 170 publications

(101 citation statements)

References 39 publications

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“…By referring to the Powder Diffraction Files (PDFs) of the Joint Committee on Powder Diffraction Standards (JCPDS), it was found that the characteristic peaks of all Co 3 O 4 catalysts were in accordance with those of cobalt oxide (JCPDS PDF# 42-1467) with a typical spinel crystal structure, and no reflection signal assignable to CoO or other phases was observed. The diffraction peaks at 2θ = 19.5, 31.6, 37.0, 39.0, 45.0, 56.3, 59.5, 65.5, and 77.9°corresponded to the crystalline planes of (111), (220), (311), (222), (400), (422), (511), (440), and (128), respectively, which was consistent with the results previously reported by other researchers [11,[38][39][40][41][42]. These findings indicated that the acid treatment caused no obvious changes in the crystal structure of the Co 3 O 4 catalyst.…”

Section: Textural Properties Of Co 3 O 4 Catalystssupporting

confidence: 82%

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: Textural Properties Of Co 3 O 4 Catalystssupporting

confidence: 82%

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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“…belonging to CoAl2O4 or Co3O4 species [48,49] (Table 4). This ratio suggests that the surface amount of Co 2+ is higher in the Co 6 Al 2 HTMW500 solid.…”

mentioning

confidence: 99%

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

et al. 2015

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Co6Al2HT hydrotalcite-like compounds were synthesized by three different methods: co-precipitation, microwaves-assisted and ultrasound-assisted methods. The mixed oxides obtained after calcination were studied by several techniques: XRD, TEM, H2-TPR and XPS. They were also tested as catalysts in the reaction of total oxidation of toluene. The physico-chemical studies revealed a modification of the structural characteristics (surface area, morphology) as well as of the reducibility of the formed mixed oxides. The solid prepared by microwaves-assisted synthesis was the most active. Furthermore, a relationship between the ratio of Co 2+ on the surface, the reducibility of the Co-Al mixed oxide and the T50 in toluene oxidation was demonstrated. This suggests a Mars Van Krevelen mechanism for toluene total oxidation on these catalysts.

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Deep oxidation of volatile organic compounds using ordered cobalt oxides prepared by a nanocasting route

Cited by 170 publications

References 39 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

Co-Al Mixed Oxides Prepared via LDH Route Using Microwaves or Ultrasound: Application for Catalytic Toluene Total Oxidation

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