Nickel-aluminium complex: a simple and effective precursor for nickel aluminate (NiAl2O4) spinel

A reaction of aluminium hydroxide, nickel nitrate and triethanolamine in ethylene glycol provided, in one step, a simple and effective nickel-aluminium complex precursor for NiAl2O4 spinel. On the basis of 1H-, 13C-NMR spectroscopy, and mass spectrometry, the possible structure of the complex was proposed as a trimetallic double alkoxide consisting of two four-coordinate TEA-Al (alumatrane) moieties linked via a bridging TEA group enfolding the Ni2+ cation. Transformation of the nickel-aluminium complex to pure spinel occurred when the complex precursor was pyrolysed at 1000C for 5 h. The BET surface area of the pyrolysed product was found to be 31 m2/g. In addition, the morphology of the powder product was examined by SEM

2-{[(2-Hy­droxy-3,5-dimethyl­benz­yl)(meth­yl)amino]­meth­yl}-4,6-dimethyl­phenol

In the title compound, C19H25NO2, the dihedral angle between the benzene rings is 53.15 (8)°. One of the –OH groups forms an intra­molecular O—H⋯N link, generating an S(6) ring. The other –OH group forms an inter­molecular O—H⋯N hydrogen bond in the crystal, generating centrosymmetric R 2 2(20) loops

Photocatalytic Activity of Toluene under UV-LED Light with TiO2 Thin Films

Titanium dioxide (TiO2) and ferric-doped TiO2 (Fe-TiO2) thin films were synthesized on the surface of 304 stainless steel sheets using a simplified sol-gel preparation method. The Fe-TiO2 thin films were prepared with weight-to-volume ratios of /TiO2 of 0.3%, 0.5%, and 0.7%, respectively. The crystalline phase structures of the prepared TiO2 and Fe-TiO2 thin films were entirely anatase. The measured optical band gaps of the TiO2, 0.3% Fe-TiO2, 0.5% Fe-TiO2, and 0.7% Fe-TiO2 thin films were 3.27, 3.28, 3.22, and 2.82 eV, respectively. The grain sizes and other physical properties of the prepared thin films were also reported. The kinetics of the photocatalytic processes under a UV-LED light source could be explained by the Langmuir-Hinshelwood kinetic model with the specific rates of , , , and  , for TiO2, 0.3% Fe-TiO2, 0.5% Fe-TiO2, and 0.7% Fe-TiO2, respectively. An increase in dopant concentration could enhance the photocatalytic activity of toluene decomposition as a result of lower optical band gaps, smaller grain size, and higher surface area

A novel colorimetric sensing material, poly(g-Glutamic acid)-graft-3,4-Dihydro-3-(2¢-ethyl hydroxyl)-6-Ethyl-1,3,2H-Benzoxazine (g-PGA-graft-ethyl-Bx), for Iron(III) ions

A novel rapid ion colorimetric sensing material for iron(III) ions was developed from poly(γ-glutamic acid) and 3,4-dihydro-3-(2′-ethyl hydroxyl)-6-ethyl-1,3,2H-benzoxazine (ethyl-Bx). The benzoxazine as an ionophore segment was grafted into γ-PGA backbone via the esterification reaction, which is a simple and effective reaction. The structure of γ-PGA-graft-ethyl-Bx was characterized by using FT-IR and 1H-NMR. The most attainable degree of conversion was 25%. The γ-PGA-graft-ethyl-Bx showed a highly selective and sensitive recognition toward iron(III), which was clearly observable with the naked eye. The iron(III) ions sensing property of γ-PGA-graft-ethyl-Bx was further examined by using photometric titration method. After the interaction between the γ-PGA-graft-ethyl-Bx and iron(III) ions was formed, the solution of the polymer in dimethyl sulfoxide was changed from clear and colorless to red color, resulting in the shift of the maximum wavelength from UV to visible range

4,4′-Dimethoxy-2,2′-[methylazanediylbis(methylene)]diphenol

The title compound, C17H21NO4, shows an intramolecular hydrogen bond between a phenol OH group and the N atom. In the crystal, molecules are connected by pairs of O—H...O hydrogen bonds into inversion dimers

4,4′-Diethyl-2,2′-[(N-cyclohexylimino)bis(methylene)]diphenol

The title compound, C24H33NO2, exhibits an intramolecular hydrogen bond between a phenol –OH group and the N atom. In the crystal, molecules are connected by pairs of O—H...O hydrogen bonds

Preparation of Palladium-Impregnated Ceria by Metal Complex Decomposition for Methane Steam Reforming Catalysis

Palladium-impregnated ceria materials were successfully prepared via an integrated procedure between a metal complex decomposition method and a microwave-assisted wetness impregnation. Firstly, ceria (CeO2) powders were synthesized by thermal decomposition of cerium(III) complexes prepared by using cerium(III) nitrate or cerium(III) chloride as a metal source to form a metal complex precursor with triethanolamine or benzoxazine dimer as an organic ligand. Palladium(II) nitrate was consequently introduced to the preformed ceria materials using wetness impregnation while applying microwave irradiation to assist dispersion of the dopant. The palladium-impregnated ceria materials were obtained by calcination under reduced atmosphere of 10% H2 in He stream at 700°C for 2 h. Characterization of the palladium-impregnated ceria materials reveals the influences of the metal complex precursors on the properties of the obtained materials. Interestingly, the palladium-impregnated ceria prepared from the cerium(III)-benzoxazine dimer complex revealed significantly higher BET specific surface area and higher content of the more active Pdδ+ (δ > 2) species than the materials prepared from cerium(III)-triethanolamine complexes. Consequently, it exhibited the most efficient catalytic activity in the methane steam reforming reaction. By optimization of the metal complex precursors, characteristics of the obtained palladium-impregnated ceria catalysts can be modified and hence influence the catalytic activity