Wyniki wyszukiwania - Biblioteka Nauki

1

Termograwimetria

100%

Kuberski S. M. , Nowicki L.

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1999

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tom R. 4, nr 2

6-8

2

Removal of carbonaceous matters over alumina supported chromium and platinum chromium catalysts

94%

Sarbak Z. , Surma K. , Wieczorek K.

Polish Journal of Chemical Technology

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2008

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tom 10

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nr 1

57-59

EN

Platinum, both alone and with a low and high amount of chromium as an additive supported on alumina, was studied as a catalyst. These catalysts were examined in the removal of the carbonizate as a model material. It was found that the 2Cr/Al2O3 catalyst showed a significant increase in the catalytic activity as compared to 20Cr/Al2O3. An addition of platinum was found to cause a decrease of activity.

3

Thermal decomposition and IR-spectra of Mg(II) Complexes with G-picoline

94%

Mojumdar S. , Melnik M. , Jóna E.

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1999

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tom vol. 73 nr 2

293-297

EN

The thermal decomposition of the complexes Mg(Clac)2(pic)2×3H20 (I), Mg(Cl2ac)2(pic) × 4H20 (II) and Mg(Cl3ac)2(pic)2 × 3H2O (III), where Clac = ClCH2COO-, Cl2ac = Cl2CHCOO-, Cl3ac = Cl3CCOO- and pic = g-picoline had been investigated in air by TG and DTA. The possible scheme of destruction of the complexes is suggested. The final product was MgO for the complex I-III. The thermal stability of the complexes can be ordered in the sequence: I = III < II. IR data suggest a unidentate coordination of carboxylates to Mg (II) in complexes I-III and g-picoline coordination with Mg(II) through the nitrogen atom of its heterocyclic ring.

4

Kalorymetryczna ocena polistyrenu na krystalizację polipropylenu

84%

Kościuszko A. , Jakubowska P. , Kloziński A. , Sterzyński T.

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2009

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tom R. 106, z. 1-M

187-190

PL

W pracy przedstawiono wyniki kalorymetrycznej oceny wpływu polistyrenu na krystalizację polipropylenu. W badaniach zastosowano mieszaninę PP/PS (100/0, 75/25, 50/50, 25/75, 0/100) pięciokrotnie przetwarzaną, dla której wyznaczono krzywe DSC oraz TG. Stwierdzono istotny wpływ PS na krystalizację PP zarówno w funkcji składu mieszaniny, jak i krotności przetwórstwa.

EN

The calorimetric studies of an influence of polystyrene addition on the polypropylene crystallization are presented in this paper. The multiple recycled (5 times) PP/PS blends (100/0, 75/25, 50/50, 25/75, 0/100) were investigated by means of DSC and TG methods, and the corresponding curves were determined. It was found that both, the blend composition and the multiple reprocessing has a significant influence on the crystallization of polypropylene at the presence of an amorphous polystyrene.

5

Catalysts preparation and investigation: laboratory exercise for students

83%

Zawadzki W.

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

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2019

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tom 74

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nr 1

EN

Catalysts preparation, investigation its basic properties, activity and selectivity measurements in carbon dioxide methanation reaction was proposed as laboratory course for international students doing a period of study at Maria Curie-Sklodowska University within the frame of the Erasmus mobility programme.

6

Physico-chemical properties of Chitosan films

71%

Balau L. , Lisa G. , Popa M. , Tura V. , Melnig V.

Open Chemistry

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2004

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tom 2

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nr 4

638-647

EN

Chitosan films obtained by dry phase inversion were prepared from an aqueous solution of chitosan in acetic acid. The films, of thickness less than 20 μm, were transparent, very flexible and had smooth surfaces. Increasing the film thickness induced an increase of the internal tensions and the consequent formation of a rough surface. Structural investigations by X-ray diffraction and Fourier transform IR analysis, showed that the chitosan films, as prepared, are amorphous. Further annealing to evaporate acetic acid and water traces, changed the amorphous phase into a more ordered phase, characterized by diffraction peaks at 2θ values of 9, 17, 20 and 23 degrees. Thermal investigations by TG, DTG, and DTA revealed that the decomposition of the chitosan films as prepared proceeds in two stages, starting from 180°C and 540°C.

7

Investigation of Phase Equilibria in the System Nd2O3–Na2O–P2O5. Quasibinary Section NdPO4–Na3PO4

71%

Znamierowska T. , Bandrowski S.

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2006

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tom Vol. 80, nr 10

1731-1735

EN

Quasibinary section NdPO4–Na3PO4 has been investigated by thermoanalytical methods (DTA, TG, DTG), X-ray powder diffraction and microscopy. Its phase diagram is proposed. It is found, that the parent orthophosphates react in the molar ratio 1:1 yielding an intermediate compound of Na3Nd(PO4)2. This phosphate melts incongruently at 1485C, giving NdPO4 and an Na3PO4-rich liquid. Na3Nd(PO4)2 compound is stable down to room temperature and exhibits a polymorphic transition at about 1040 graduate C.

8

Thermochemical and Spectral properties of Hydrates of Co(II), Ni(II) and Cu(II) Maleate. Crystal Structure of Co(II) Maleate Trihydrate

71%

Pajtasova M.

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2001

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tom Vol. 75, nr 9

1209-1217

EN

The crystal and molecular structure of Co(II) maleate trihydrate, Co(C4H2O4)_3H2O, was determined by direct method and Fourier techniques. The structure was refined by full-matrix least-squares methods to a weighted R factor of 0.0263, based on independent reflections. The compound is a three-dimensional coordination polymer with distorted octahedron geometry at each cobalt(II) centre. Each cobalt atom is six-coordinated through two oxygen atoms from water molecules and four oxygen atoms from four different maleate groups. The thermal decompositions of Co(mal)_3H2O, Ni(mal)_3H2O and Cu(mal)_H2O(mal = maleate) have been investigated by means of TG, DTG, DSC and IR spectra. The release of volatile molecules after heating is either a three-step process for Co(mal)_3H2O and Ni(mal)_3H2O or a two-step process for Cu(mal)_H2O.

9

Spectral and thermal properties of copper(II) complexes with methyl-3-pyridyl carbamate

71%

Mojumdar S. , Melnik M. , Valko M.

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1999

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tom vol. 73 nr 3

457-463

EN

Thermogravimetry (TG), differential thermal analysis (DTA), infrared (IR), electronic, EPR spectra and other analytical methods have been applied to the investigation of the thermal behaviour and structure of the compounds [Cu(ac)2(mpc)]2×2CH3OH (I), Cu(Clac02(mpc) (II), Cu(Cl2ac)2(mpc)2 (III) and Cu(Cl3ac)2(mpc)2 (IV) (where ac = CHCOO-, Clac = ClCH2COO-, Cl2ac = Cl2CHCOO-, Cl3ac = Cl3CCOO- and mpc = methyl-3-pyridyl carbamate). The solid phase intermediate and resultant products of thermolysis had been identified. The possible scheme of decomposition of the complexes is suggested with as a final product, CuO. IR data suggest a unidentate coordination of carboxylate to copper(II). Methyl-3-pyridyl carbamate was coordinated through nitrogen atom of its heterocyclic ring in complexes I-IV. EPR spectra suggest a diametric structure of complex I and manometric structure of complexes II-IV.

10

Investigation of Phase Equilibria in the System Nd2O3–Na2O–P2O5: The Partial System NdPO4–Na3PO4–Na4P2O7

71%

Znamierowska T. , Bandrowski S.

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2007

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tom Vol. 81, nr 4

485-492

EN

The NdPO4–Na3PO4–Na4P2O7 portion of the oxide Nd2O3–Na2O–P2O5 system was investigated using thermoanalytical, X-ray powder diffraction and light microscopy techniques, and its phase diagram has been proposed. In the composition range of interest one ternary compound occurs, Na3Nd(PO4)2, which melts incongruently at 1485C and exhibits a polymorphic transition at about 1040C. Two subsystems: NdPO4–Na4P2O7 and Na3Nd(PO4)2–Na4P2O7, which are quasi-binary only in the subsolidus regions, i.e. 944C and 967C, respectively, have been found. It has been shown that a ternary peritectic (tP = 967C) and a ternary eutectic (t = 961C) occur in the quasi-ternary NdPO4–Na3PO4–Na4P2O7 system.