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activities have been examined with many attempts to generalize the achieved results. These attempts are often reported with azo dyes as model compounds. The main reason for using azo dyes as models is the simple spectral determination of their photocatalytic

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(charges, chemical state) as well. The chemical quality of the model compound also plays an important role in heterogeneous photocatalysis: in aqueous media, its hydrophilicity could be a decisive factor in the adsorption process and the

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catalysts were focused on sulfide, phosphide and noble metal catalysts [ 3 ]. Many oxygen-containing compounds such as phenols [ 4 – 10 ], furans [ 11 – 16 ], ketones [ 17 – 19 ] and alcohols [ 20 – 22 ] have been used as model compounds to study the HDO

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Abstract  

Ruthenium catalysts have been prepared by incipient wetness impregnation of ruthenium(III) nitrosylnitrate, Ru(NO)(NO3)3 onto high surface area titanate supports obtained by hydrothermal treatment of TiO2 P25 in concentrated alkaline solutions. These Ru-containing catalysts were evaluated in the catalytic wet air oxidation of p-hydroxybenzoic acid (p-HBZ), a model compound representative of phenolic pollutants present in olive mills wastewaters, at 413 K and 50 bars of air. Two different titanates morphologies were tested as supports for this reaction: hydrogenotitanate nanotubes (HNT) obtained with concentrated NaOH and hydrogenotitanate nanowires (HNW) formed in the presence of highly concentrated KOH solution. The HNT and HNW supports and their corresponding supported Ru catalysts were characterized by means of N2 adsorption–desorption, XRD, UV and TEM analyses. Results showed that the use of high surface area titanate supports led to catalysts much more active than similar Ru catalysts supported on conventional TiO2 supports.

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Abstract

Different contents of promoter (Co) in Co–Ni–Mo–B amorphous catalysts were prepared by chemical reduction of the precursors of metal salts with a sodium borohydride aqueous solution. The catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Adding a proper content of the promoter Co into Ni–Mo–B amorphous catalyst could increase the MoO2 content and decrease the particle size, but doping excess Co would cover some of the active sites and increase the particle size of the catalysts. The effect of Co content on the catalytic hydrodeoxygenation activity of the amorphous catalysts was studied using phenol as a model compound. The main route for the HDO of phenol on these amorphous catalysts was hydrogenation–dehydration and the content of aromatic compounds in HDO products was decreased obviously. The pseudo first-order reaction rate constant of the phenol HDO on Co–Ni–Mo–B amorphous catalyst was much greater than that of MoS2 when adding proper promoter Co.

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results indicate that the HDS of BT is significantly higher compared to DBT, especially at lower temperatures. This result showed that DBT is far more difficult to desulfurize and hence it is considered as a relatively refractory model compound

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. Metalloporphyrin and metallosalen complexes of iron, manganese, chromium, and ruthenium have been used as model compounds and have been shown to be capable of catalyzing oxygen atom transfer from mono oxygen sources such as iodosylbenzene, H 2 O 2 , peracids

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furanic structure [ 3 – 7 ]. Therefore, benzofuran (BF) was chosen as model compound to investigate the catalytic properties of the prepared catalysts. The conventional HDO process was carried out over Mo- or W-base sulfides supported on alumina

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of ZnO and ZnO/ITO thin films, the photodegradation of a well-known organic azo dye Direct Sky Blue 5B was investigated, as a simple model compound, under UV irradiation. The solution of the dye with 5 ppm concentration was prepared in doubly

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the adsorption and kinetics of photodegradation of a model compound for heterogeneous photocatalysis onto TiO 2 . Chemosphere . 64 : 1128 – 1133 10.1016/j.chemosphere.2005.11.050 . 2. Kim

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