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Abstract
Cadmium(II) and Pb(II) ions replace the sodium(I) ion in commercial molecular sieve deolite. These exchanged derivatives have been interacted with adsorbates like CO2 and NH3 and the new exchanged and adsorbed derivatives characterized by their TG and IR spectral data. It is concluded that deolite can be effectively employed for removal of hazardous Cd(II) and Pb(II) ions as well as the gaseous adsorbates.
Summary The reaction of a hydrated nitrate salt of lanthanide (Ln=Pr, Nd, Gd, Dy, Er) with the polyfunctional ligand salicylhydroxamic acid (H3sha), in the presence of base, afforded solid compounds, insoluble in common organic solvents and in water. The new complexes characterized by means of elemental analyses (C, H, N, Ln), magnetic moment determinations and spectroscopic data (IR, MS). It is proposed that they are neutral, with a possible polymeric structure of the general type: [Ln2(Hsha)2(H2sha)(DMF)x(CH3O)(H2O)]n×2H2O Their thermal decomposition was studied in nitrogen and/or oxygen atmosphere, between 25-1000°C by using simultaneous TG/DTG-DTA technique. The IR spectroscopy used to determine the intermediates and the final products. The intermediates at 180°C suggest the formation of N-hydroxylactam complex, which upon further heating gives a carbonaceous residue of Ln2O3 at 1000°C in nitrogen, while in oxygen the stable oxides are formed at 600°C.
,β-unsaturated aldehydes. For noble metal catalysts, the selectivity for C=O hydrogenation is as follows: Ir > Pt > Ru > Rh [ 5 ]. Sokolskii et al. [ 6 ] confirmed a trend as Os > Ir > Ru > Rh ≈ Pt ≈ Pd for the selective hydrogenation of crotonaldehyde. It shows that Ir
. [ 16 ] obtained in the citral hydrogenation using Ir–Au/TiO 2 catalysts indicate that is more active and selective towards the unsaturated alcohol that Ir/TiO 2 or Au/TiO 2 . On the other hand, generally, supported Au catalysts are produced by
know about the sample, or what we can find in the literature, or we can attempt to analyze the effluent from the TG in an effort to understand what materials are being evolved and when. FT-IR spectroscopy is another relatively simple analytical
. Recent literature screening shows the high interest in the use of thermoanalytical techniques, differential scanning calorimetry (DSC) and thermogravimetry (TG) for this purpose [ 4 – 6 ], as well as of spectroscopic techniques, IR spectroscopy with
Experiments in Fluids 2003 34 275 284 Gordge D. N., Page R. H. IR imagery of an air/CO2 axi
coupled with Fourier transformed infrared (FT/IR). It was reported the TG-FT/IR pyrolysis experiment at low heating rates of biomass samples (wheat straw, tobacco) and pyrolysis yield was evaluated [ 3 ]. It was investigated palm oil waste, are the major
presented in study [ 9 ]. The powder diffraction patterns of selected samples were indexed by means of the Refinement program. The internal standard was α-Al 2 O 3 . IR spectroscopic measurements were conducted with the use of the spectrometer
useful in controlling quality changes in food during processing and in storage [ 10 , 11 ]. IR spectroscopy, on the other hand, serves as an established method to determine types and number of chemical bonds present in a sample and therefore it can be
