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Wojciechowska, Maria; Pietrowski, Mariusz; Lomnicki, Slawo; Czajka, B.

doi:10.1023/a:1019033527231

Cited by 14 publications

(11 citation statements)

References 23 publications

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“…Thus, it is reasonable to conclude that the factor determining the catalyst activity is the type of the support. As we have shown in [27], in HDS of thiophene the ruthenium catalysts supported on MgF 2 were more active than those supported on SiO 2 and Al 2 O 3 , and even more active than the industrial cobalt-molybdenum catalyst. The results presented in Fig.…”

Section: Resultsmentioning

confidence: 54%

“…MgF 2 begins to crystallize already on drying at 80°C. After calcination at 400°C it has a well-developed crystalline phase [27], and the calcination at 900°C significantly enhances its crystalline character. MgO requires higher calcination temperatures in order to obtain well-developed crystalline phase, as--in contrast to MgF 2 --after calcination at 400°C it just begins to crystallise.…”

Section: Resultsmentioning

confidence: 99%

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Properties of Magnesium Oxo-Fluoride Supports for Metal Catalysts

et al. 2008

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A mixed MgF 2 -MgO system has been tested as a potential support of iridium catalysts in the hydrodesulfurization of thiophene. Samples of MgF 2 -MgO with different contents of MgO (0-100%) have been prepared by one-step sol-gel method in the reaction of magnesium methoxide dissolved in methanol with hydrofluoric acid. They have been used as supports for the synthesis of iridium (1 wt% Ir) catalysts. The supports have been characterized by XRD, low temperature nitrogen adsorption and thermogravimetric measurements. The one-step method of MgF 2 -MgO synthesis has been shown to permit the control of MgO content in the mixed system. The MgF 2 -MgO samples are classified as mesoporous, of large surface area (100-450 m 2 g -1 ) depending on the amount of MgO introduced, with the maximum for 71 mol% MgO. The presence of two phases in the mixture delays the process of both MgF 2 and MgO crystallization and increases the resistance of the MgF 2 -MgO texture to treatment at temperatures up to 800°C. The catalysts obtained by deposition of the iridium phase on MgF 2 , MgO and MgF 2 -MgO (62 mol% MgO) calcined at 400-700°C, have been tested in the reaction of hydrodesulfurization of thiophene. The most active has been the iridium catalyst supported on MgF 2 -MgO.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Properties of Magnesium Oxo-Fluoride Supports for Metal Catalysts

et al. 2008

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“…It was obtained by mixing of copper nitrate with manganese acetate and calcination of the mixture at 400°C. The spinel phase CuMn 2 O 4 gives a peak at 2Q = 36° [19]. The signal was observed in the diffractograms of the unsupported mixture and the catalyst Cu 2 Mn 4 /F-4.…”

Section: Low-temperature N 2 Adsorptionmentioning

confidence: 89%

“…Its surface of mesoporous structure is relatively large ($45 m 2 g )1 ). Earlier studies on transition oxides and metallic active phases supported on MgF 2 have provided active and selective catalysts in thiophene hydrodesulfurisation [15,16], hydrodechlorination of chloro-fluoro-hydrocarbons [17,18], reduction of NO [19] and oxidation of CO.…”

Section: Introductionmentioning

confidence: 99%

Effect of MgF2 and Al2O3 supports on the structure and catalytic activity of copper–manganese oxide catalysts

et al. 2007

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Structure and catalytic activity of double copper-manganese oxide catalysts supported on MgF 2 and Al 2 O 3 have been studied. All samples were calcined at 400°C and those supported on Al 2 O 3 also at 550 and 950°C. The properties of surface species have been characterized by low temperature adsorption of nitrogen, XRD and TPR-H 2 . The catalytic activities have been tested in lowtemperature CO oxidation and in NO reduction by propene. The supported oxides react with each other during calcination to form CuMn 2 O 4 spinel. The spinel seems to be responsible for the catalytic activity of the double copper-manganese catalysts. The temperature of calcination changes the strength of interaction between the active phase and the supports influencing the catalytic activity.

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“…Earlier attempts at using MgF 2 supported systems have brought about active and selective catalysts for the NO reduction in the presence of CO [14,15] and hydrocarbons [16,17] as reducing agents, CO oxidation [18], hydrodesulfurization of thiophene [19,20] and hydrodechlorination of chlorofluorocarbons [21,22].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Properties of Cr2O3 Doped with MgO Supported on MgF2 and Al2O3

et al. 2005

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Catalytic properties of Cr 2 O 3 supported on MgF 2 or Al 2 O 3 have been modified by magnesium oxide. The catalysts have been obtained by the co-impregnation method and characterised by: BET, XRD and TPR. As follows from the results, the oxides supported on magnesium fluorine react with each other already at 400°C, leading to formation of an amorphous spinel-like phase. On the Al 2 O 3 support such an MgCr 2 O 4 spinel has appeared at much higher temperatures. The addition of magnesium oxide has a significant effect on the activity and selectivity of the catalysts studied in the CO oxidation reaction at room temperature and in the reaction of cyclohexane dehydrogenation. The magnesium-chromium catalysts supported on MgF 2 have been found to show much higher activity and selectivity than the analogous systems supported on Al 2 O 3 .

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Cited by 14 publications

References 23 publications

Properties of Magnesium Oxo-Fluoride Supports for Metal Catalysts

Properties of Magnesium Oxo-Fluoride Supports for Metal Catalysts

Effect of MgF2 and Al2O3 supports on the structure and catalytic activity of copper–manganese oxide catalysts

Catalytic Properties of Cr2O3 Doped with MgO Supported on MgF2 and Al2O3

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