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Wojciechowska, Maria; Czajka, B.; Pietrowski, Mariusz; Zieliński, Michał

doi:10.1023/a:1019016110664

Cited by 38 publications

(21 citation statements)

References 9 publications

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“…From among the supports, magnesium fluoride revealed very high crystallinity as reported in [13]. Weak and broad signals recorded for aluminium oxide indicated a low degree of crystallinity, particularly after calcination at 400°C.…”

Section: Xrdsupporting

confidence: 55%

“…The application of magnesium fluoride as a support has been limited although its structure, chemical and catalytic properties have been well recognised [12]. It is characterised by almost chemically inert surface and good thermal stability up to $500°C [13], it has a mesoporous structure and its surface area reaches $45 m 2 /g, after calcination at 400°C.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Xrdsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

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

et al. 2005

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“…Magnesium hydroxide groups on magnesium fluoride and general magnesium hydroxide have been discussed in the literature as basic species [7,8] and have been applied as basic catalysis. [9][10][11] In contrast, our new materials have proved to be very active in reactions requiring acidic sites.…”

Section: Introductionmentioning

confidence: 99%

Novel Sol–Gel Synthesis of Acidic MgF_2−x(OH)_x Materials

Wuttke

Coman

Scholz

et al. 2008

Chemistry A European J

103

110

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Novel magnesium fluorides have been prepared by a new fluorolytic sol-gel synthesis for fluoride materials based on aqueous HF. By changing the amount of water at constant stoichiometric amount of HF, it is possible to tune the surface acidity of the resulting partly hydroxylated magnesium fluorides. These materials possess medium-strength Lewis acid sites and, by increasing the amount of water, Brønsted acid sites as well. Magnesium hydroxyl groups normally have a basic nature and only with this new synthetic route is it possible to create Brønsted acidic magnesium hydroxyl groups. XRD, MAS NMR, TEM, thermal analysis, and elemental analysis have been applied to study the structure, composition, and thermal behaviour of the bulk materials. XPS measurements, FTIR with probe molecules, and the determination of N(2)/Ar adsorption-desorption isotherms have been carried out to investigate the surface properties. Furthermore, activity data have indicated that the tuning of the acidic properties makes these materials versatile catalysts for different classes of reactions, such as the synthesis of (all-rac)-[alpha]-tocopherol through the condensation of 2,3,6-trimethylhydroquinone (TMHQ) with isophytol (IP).

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“…A great advantage of magnesium fl uoride is its easy preparation and availability as well as the low price of reactants used for its synthesis. Magnesium fl uoride is a good mesoporous support having well-developed porous structure, high chemical inertness, thermal stability and hardness 16, 17 . Selective catalytic reduction of halogenated nitroaromatic compounds is the most widely used method for the syntheses of halogenated anilines -important reagents for the manufacture of a wide variety of drugs, pesticides, pigments and dyes.…”

Section: 10mentioning

confidence: 99%

Nanocolloidal Ru/MgF₂ Catalyst for Hydrogenation of Chloronitrobenzene and Toluene

Pietrowski

Zieliński

Wojciechowska

2014

Polish Journal of Chemical Technology

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The use of magnesium fl uoride support for ruthenium active phase allowed obtaining new catalysts of high activities in the hydrogenation of toluene and ortho-chloronitrobenzene. Ruthenium colloid catalysts (1 wt.% of Ru) were prepared by impregnation of the support with the earlier produced polyvinylpyrrolidone (PVP)-stabilized ruthenium colloids. The performances of the colloidal catalysts and those obtained by traditional impregnation were tested in the reactions of toluene hydrogenation to methylcyclohexane and selective hydrogenation of ortho-chloronitrobenzene (o-CNB) to ortho-chloroaniline (o-CAN). It was shown that the use of chemical reduction method allows obtaining highly monodisperse ruthenium nanoparticles of 1.6-2.6 nm in size. After reduction in hydrogen at 400 o C, the colloidal ruthenium nanoparticles were found to strongly interact with MgF 2 surface (SMSI), which decreased the catalyst ability to hydrogen chemisorption, but despite this, the colloid catalysts showed higher activity in o-CNB hydrogenation and higher selectivity to o-CAN than the traditional ones. It is supposed that their higher activity can be a result of high dispersion of Ru in colloid catalysts and the higher selectivity can be a consequence of the lower availability of hydrogen on the surface.

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Cited by 38 publications

References 9 publications

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

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

Novel Sol–Gel Synthesis of Acidic MgF_2−x(OH)_x Materials

Nanocolloidal Ru/MgF₂ Catalyst for Hydrogenation of Chloronitrobenzene and Toluene

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Untitled

Cited by 38 publications

References 9 publications

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

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

Novel Sol–Gel Synthesis of Acidic MgF2−x(OH)x Materials

Nanocolloidal Ru/MgF2 Catalyst for Hydrogenation of Chloronitrobenzene and Toluene

Contact Info

Product

Resources

About

Novel Sol–Gel Synthesis of Acidic MgF_2−x(OH)_x Materials

Nanocolloidal Ru/MgF₂ Catalyst for Hydrogenation of Chloronitrobenzene and Toluene