Catalytic properties of manganese oxide polyhedra with hollow and solid morphologies in toluene removal

Liao, Yinnian; Zhang, Xuan; Peng, Ruosi; Zhao, Mengqi; Ye, Daiqi

doi:10.1016/j.apsusc.2017.02.012

Cited by 107 publications

(43 citation statements)

References 25 publications

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“…The electrophilic absorbed oxygen molecules are activated on catalysts surface, and reacts with nucleophilic toluene [30]. Activated adsorbed oxygen, the very beginning species of the benzoquinone reaction route, can totally increase catalyst activity [30,31]. The Raman spectrum is a well-recognized, powerful tool for studying defects of nanocrystalline materials.…”

Section: Textural Analysismentioning

confidence: 99%

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Wang

et al. 2019

Catalysts

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Rational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo2O4/NiO nanocage. This synthetic strategy contains a partial in situ transformation of ZIF-67 (zeolitic imidazolate framework-67) into Co-NiLDH yolk-shelled structures following ethanol etching, and a structure-preserved transformation from Co-NiLDH@ZIF-67 to a biphase nanocage following calcination. CoNi-yh-T (varied reaction time and calcination temperature) nanocages were investigated systematically by Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), H2- temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and studied for toluene oxidation. The CoNi-6h-350 sample showed much higher activity with 90% toluene conversion (T90) at 229 °C at a high space velocity (SV = 60,000 mL g−1 h−1) than other catalysts (T90 >240 °C). Abundant surface high valence Co ions caused by the novel hierarchical nanostructures, together with adsorbed oxygen species and abundant medium-strength surface acid sites, played a key role for catalytic activities.

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Section: Textural Analysismentioning

confidence: 99%

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Wang

et al. 2019

Catalysts

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“…Catalytic oxidation, one of the most effective control technologies for VOCs, has been widely studied in the past decade [5,6]. The performance of the oxidation catalyst is regarded as a key factor in determining the efficiency of catalytic oxidation technique [7,8]. VOCs total oxidation catalysts mainly include transition metal oxides and noble metals [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

et al. 2019

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Cobalt cerium oxide catalysts with small molecular organic acids (SOAs) as chelating agents were prepared via the sol–gel method and investigated for the complete oxidation of toluene. Four kinds of natural SOAs, i.e. malic acid (MA), citric acid (CA), glycolic acid (GA), and tartaric acid (TA), were selected. The effect of organic acids on the composition, structure, morphology and catalytic performance of metal oxides is discussed in details. The cobalt cerium oxides catalysts were characterized by various techniques, including TG–DSC, XRD, SEM–EDS, N2–adsorption and desorption, XPS, and H2–TPR analyses. The results show that the nature of organic acids influenced the hydrolysis, condensation and calcination processes, as well as strongly affected the textural and physicochemical properties of the metal oxides synthesized. The best catalytic activity was obtained with the CoCe–MA catalyst, and the toluene conversion reached 90% at 242 °C. This outstanding catalytic activity could be related to its textural, redox properties and unique surface compositions and oxidation states. In addition, the CoCe–MA catalyst also showed excellent stability in long–time activity test.

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“…Therefore, the oxygen contents in CuO/Al 2 O 3 and Al 2 O 3 were analyzed using XPS, and shown in Figure b. Three peaks can be obtained by fitting the peaks of O 1 s. The binding energy of 529–530 eV corresponds to the peak of lattice oxygen, and 531–532 eV corresponds to the peak of surface oxygen, and 533–534 eV corresponds to adsorbed oxygen . The contents of lattice oxygen, surface oxygen, and adsorbed oxygen of CuO/Al 2 O 3 and Al 2 O 3 are shown in Table .…”

Section: Resultsmentioning

confidence: 99%

Study on CuO/Al₂O₃ catalytic ozone treatment of acid red B solution

Qian

Chen

et al. 2019

J Chinese Chemical Soc

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A CuO/Al2O3 catalyst was prepared using the impregnation method. The catalytic activity of CuO/Al2O3 for the ozonation of acid red B (ARB) in aqueous solution was studied, the chemical oxygen demand (COD) removal rate was an indicator for catalytic activity evaluation. The effects of initial ARB concentration, solution pH, and different oxidative degradation systems on oxidative degradation of ARB solution were studied. The CuO/Al2O3 catalyst was characterized using X‐ray diffractometry (XRD), N2 adsorption desorption test, X‐ray photoelectron spectroscopy (XPS), and zero‐point charge (pHzpc). The results show that copper species on the carrier were in the form of CuO and highly dispersed on the carrier. CuO can increase the alkalinity of the Al2O3 surface, and the CuO/Al2O3 catalyst facilitates the decomposition of O3 into ·OH, which was beneficial for the catalytic O3 oxidation degradation reaction. With the increase of the initial concentration of simulated wastewater, the CuO/Al2O3 catalytic reaction still has a high COD removal rate. Alkaline solution was of benefit to catalyze the degradation of ARB solution. When the ARB solution pH = 8.93, the degradation reaction was carried out for 40 min, the COD removal rate reached 83.2%. The degradation reaction was dominated by the hydroxyl radical (·OH) reaction.

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Catalytic properties of manganese oxide polyhedra with hollow and solid morphologies in toluene removal

Cited by 107 publications

References 25 publications

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

Study on CuO/Al₂O₃ catalytic ozone treatment of acid red B solution

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Catalytic properties of manganese oxide polyhedra with hollow and solid morphologies in toluene removal

Cited by 107 publications

References 25 publications

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

Study on CuO/Al2O3 catalytic ozone treatment of acid red B solution

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Study on CuO/Al₂O₃ catalytic ozone treatment of acid red B solution