Natural manganese oxides as catalysts for oxidative coupling of methane: a structural and degradation study

Ioffe, L.M.; Bosch, P.; Viveros, T.; Sánchez, H.; Borod'ko, Yu. G.

doi:10.1016/s0254-0584(97)80317-3

Cited by 26 publications

(19 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over the fresh sample, the peak at 641.8 eV is consistent with the expected binding energy (BE) of the Mn 2p 3=2 electron of Mn 3 O 4 [5]. The O 1s spectra showed a strong peak at 532.4 eV and a small one at 530.2 eV.…”

Section: Temperature-programmed Surface Reaction and X-ray Photoelecsupporting

confidence: 71%

See 1 more Smart Citation

Methane dehydrogenation and aromatization over 4 wt% Mn/HZSM-5 in the absence of an oxidant

Tan

Lai

2006

Catal Lett

View full text Add to dashboard Cite

Methane dehydrogenation and aromatization over 4 wt% Mn/HZSM-5 in the absence of an oxidant (GHSV = 1600 mL h )1 g )1 ) was investigated. Mn/HZSM-5 was prepared by impregnation of HZSM-5 with manganese acetate tetrahydrate solution; Mn 3 O 4 formed was the precursor of active phase for methane activation. The induction period over Mn/ HZSM-5 catalyst before aromatic products appear was long at 700°C. This period shortened with a rise of the reaction temperature to 800°C. XPS and TPO results showed that the partly carburized or carburized Mn species formed are probably responsible for methane activation.

show abstract

Section: Temperature-programmed Surface Reaction and X-ray Photoelecsupporting

confidence: 71%

“…It was reported that manganese species exhibited good performance in methane oxidative coupling reaction [5]. It was also reported that MnO x supported on silica and silica-alumina can catalyzed the transformation of methane to higher hydrocarbons in the absence of oxygen, showing that manganese oxide can activate methane [6].…”

Section: Introductionmentioning

confidence: 99%

Methane dehydrogenation and aromatization over 4 wt% Mn/HZSM-5 in the absence of an oxidant

Tan

Lai

2006

Catal Lett

View full text Add to dashboard Cite

show abstract

“…Similarly, dust particles deposited on the filter may partially block the catalyst surface and increase its moisture content, becoming a source of secondary pollutants and affecting catalyst performance [37]. The reduction of the surface Mn(III) ions to Mn(II) leading to oxygen depletion coupled with loss of some surface species such as sodium can also decrease catalytic activity [38]. Long-term studies are being currently conducted to evaluate the lifetime of the catalyst.…”

Section: Effect Of the Relative Humiditymentioning

confidence: 99%

Quantitative room-temperature mineralization of airborne formaldehyde using manganese oxide catalysts

Sidheswaran

Destaillats

Sullivan

et al. 2011

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

Manganese oxide-based catalysts have been synthesized and tested for the abatement of formaldehyde, an ubiquitous indoor pollutant which is not effectively eliminated by most air cleaning technologies. Catalysts were prepared by co-precipitation of MnSO 4 and NaMnO 4 followed by curing at 100, 200 and 400 0 C. Characterization was performed using X-ray diffractometry (XRD), porosimetry, scanning electron microscopy (SEM), and inductively coupled plasma -mass spectrometry (ICP-MS). Diffractograms Research Highlights:). Due to the relatively low costs of synthesis and deployment of these catalysts, this technology is promising for maintaining low indoor formaldehyde levels, enabling energy-saving reductions of building ventilation rates.Synthesis of manganese oxide-based catalysts to remove indoor formaldehyde; High surface area and porosity; Small crystal size; Complete mineralization of formaldehyde;High activity maintained after processing up to 400 m 3 of formaldehyde-laden air.

show abstract

“…The manganese carbide binding energy is very rarely found in the literature. However, the binding energy of transition metals in carbides is normally in region of around 281-284 eV, and it can shift by 0.5-0.7 eV depending on the chemical environment of the transition metal [32]. Ioffe et al [32] proposed the binding energy of manganese carbide (C-Mn) to be 282.5 eV.…”

mentioning

confidence: 99%

“…However, the binding energy of transition metals in carbides is normally in region of around 281-284 eV, and it can shift by 0.5-0.7 eV depending on the chemical environment of the transition metal [32]. Ioffe et al [32] proposed the binding energy of manganese carbide (C-Mn) to be 282.5 eV. Our C 1s XPS spectrum shows that a very strong component located at around 281.7 (Fig 4 (a1)) is most likely assigned as manganese carbide due to the high ratio of Mn/Co in the manganese-cobalt thin film as seen in Table 1.…”

mentioning

confidence: 99%

Optical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol–gel dip-coating method

Amri

Jiang

Pryor

et al. 2012

Surface and Coatings Technology

View full text Add to dashboard Cite

ÔØ Å ÒÙ× Ö ÔØOptical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol-gel dip-coating method This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 AbstractNew cobalt-based metal oxide thin films (M x Co y O z with M = Mn, Cu, Ni) have been deposited on commercial aluminium and glass substrates using sol-gel dip-coating method.The as-deposited films were characterized by a wide range of complementary techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), Spectrophotometry and Nanoindentation techniques. A light absorption study for coatings on glass substrates within a wavelength range of 300-1100 nm was also conducted. Topographical and morphological investigations showed the presence of nano-sized, grain-like particles in the copper-cobalt oxide coatings, which consequently had the roughest surface among the three coatings. All coatings on glass substrate exhibited higher absorption of ultraviolet (UV) light compared to visible light, while coatings on aluminium substrate generally had low reflectance (< 50 %) of UV light, moderate reflectance (< 80 %) of visible light and high reflectance (up to 100 %) of infrared light. Implications of optical properties as a function of film thickness controlled by dip-heating cycles were discussed. The elastic modulus (E) and hardness (H) of thin film samples compared with standalone commercial aluminium substrate were also measured.

show abstract

Natural manganese oxides as catalysts for oxidative coupling of methane: a structural and degradation study

Cited by 26 publications

References 25 publications

Methane dehydrogenation and aromatization over 4 wt% Mn/HZSM-5 in the absence of an oxidant

Methane dehydrogenation and aromatization over 4 wt% Mn/HZSM-5 in the absence of an oxidant

Quantitative room-temperature mineralization of airborne formaldehyde using manganese oxide catalysts

Optical and mechanical characterization of novel cobalt-based metal oxide thin films synthesized using sol–gel dip-coating method

Contact Info

Product

Resources

About