Catalytic performance of MnOx–NiO composite oxide in lean methane combustion at low temperature

Zhang, Yagang; Qin, Zhangfeng; Wang, Guofu; Zhu, Hua; Dong, Mei; Li, Shuna; Wu, Zhiwei; Li, Zhikai; Wu, Zhenhua; Zhang, Jing; Hu, Tiandou; Fan, Wei; Wang, Jianguo

doi:10.1016/j.apcatb.2012.09.021

Cited by 195 publications

(112 citation statements)

References 49 publications

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“…3, there were two distinct peaks at binding energies (BEs) of 642.9 and 654.3 eV, while the spin-orbital splitting of 11.4 eV appeared in the Mn 2p core level spectrum of all samples. They were larger than the BEs of Mn 2 O 3 while close in size to that of MnO 2 [30,31], indicating that the obtained MnO x mainly existed in the form of MnO 2 . The XPS spectra of Mn after catalytic experiments are similar to those before catalytic experiments, indicating the valence state of Mn remained unchanged after reaction.…”

Section: Catalystsmentioning

confidence: 75%

Efficient degradation of gaseous benzene by VUV photolysis combined with ozone-assisted catalytic oxidation: Performance and mechanism

Huang

Zhan

et al. 2016

Applied Catalysis B: Environmental

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Section: Catalystsmentioning

confidence: 75%

Efficient degradation of gaseous benzene by VUV photolysis combined with ozone-assisted catalytic oxidation: Performance and mechanism

Huang

Zhan

et al. 2016

Applied Catalysis B: Environmental

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“…In recent years, considerable efforts have been made to develop multicomponent materials for the decomposition of organic pollutants because of the remarkable reaction properties such as high surface areas, high melting points and multifunctionality that single metal oxides cannot realize [6][7][8][9][10][11][12][13]. Spinel oxides are a class of complex oxides with chemical formula AB 2 O 4 , containing the normal and inverse structures.…”

Section: Introductionmentioning

confidence: 99%

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

Huang¹,

Su²,

Zhang³

et al. 2013

Journal of Hazardous Materials

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h i g h l i g h t s• The NiFe 2 O 4 had the highest activity in degradation of CB-209, followed by Fe 3 O 4 .• Hydroxyl species, organic acids, PCBs and chlorobenzenes were identified as products.• Three degradation reactions and one combination reaction competitively occurred.• Hydrodechlorination of CB-209 was more favored over Fe 3 O 4 than NiFe 2 O 4 .• Oxidation reaction of CB-209 was more favored over t r a c tA series of mesoporous iron-based spinel materials were synthesized to degrade polychlorinated biphenyls (PCBs), with CB-209 being used as a model compound. The materials were characterized by X-ray powder diffraction (XRD), pore structure analysis, and X-ray photoelectron spectroscopy (XPS). A comparison of the dechlorination efficiencies (DEs) of the materials revealed that NiFe 2 O 4 had the highest DE, followed by Fe 3 O 4 . Newly produced polychlorinated biphenyls, chlorinated benzenes, hydroxyl species and organic acids were detected by gas chromatography-mass spectrometry, high performance liquid chromatography-mass spectrometry and ion chromatograph. Identification of the intermediate products indicates that three degradation pathways, hydrodechlorination, the breakage of C C bridge bond and oxidative reaction, accompanied by one combination reaction, are competitively occurring over the iron-based spinels. The relative amounts of produced three NoCB isomers were illustrated by the C Cl BDEs of CB-209 at meta-, para-and ortho-positions, and their energy gap between HOMO and LUMO. The consumption of the reactive oxygen species caused by the transformation of Fe 3 O 4 into Fe 2 O 3 in the Fe 3 O 4 reaction system, and the existence of the highly reactive O 2 −• species in the NiFe 2 O 4 reaction system, could provide a reason why the oxidation reaction was more favored over NiFe 2 O 4 than Fe 3 O 4 .

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“…For the catalytic combustion of CH 4 in lean conditions many different catalysts have been studied so far, ranging from noble metals, mainly Pd and/or Pt supported on oxides or mixed oxides [12][13][14][15], to perovskites [16][17][18], and non-noble oxides [19,20]. In particular, among non-noble oxides in recent years cobalt oxides attracted great attention thanks to their catalytic properties, useful in many different applications, for example as magnetic materials [21,22], electrochemical devices [23,24], and various catalytic systems [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

et al. 2016

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In this work a series of cobalt spinel catalysts was synthesized by different methods and doped with 1 wt% of palladium via incipient wetness impregnation or solution combustion synthesis (SCS). Both undoped and Pd-doped spinels were characterized from the structural and surface point of view (XRD, XRF, lRS, BET, FESEM) and tested toward the oxidation of methane in lean conditions, in gas mixtures containing from 0.5 to 2 vol% of CH 4 . These methane concentrations are typical of processes involving combustion of CH 4 in lean conditions as the after-treatment of unconverted CH 4 in compressed natural gas-fed vehicle exhausts, or the treatment of fugitive CH 4 from leaks in coal mines. The temperature window for the catalytic activity of the undoped Co 3 O 4 materials spread from 350 to 600°C. The preparation method affected the catalytic activity of undoped Co 3 O 4 , with the best catalytic activity related to the spinel prepared by SCS employing urea. The addition of 1 wt% of Pd lowered the temperature window for the catalytic activity to the range of 250-500°C, with insignificant differences for the various preparation methods. The beneficial effect of Pd-doping was assigned to the enhancement of the reduction of cobalt in the oxide structure.

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Catalytic performance of MnOx–NiO composite oxide in lean methane combustion at low temperature

Cited by 195 publications

References 49 publications

Efficient degradation of gaseous benzene by VUV photolysis combined with ozone-assisted catalytic oxidation: Performance and mechanism

Efficient degradation of gaseous benzene by VUV photolysis combined with ozone-assisted catalytic oxidation: Performance and mechanism

Degradation of polychlorinated biphenyls using mesoporous iron-based spinels

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

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