Synthesis, characterization and catalytic properties of sol–gel derived mixed oxides

Farias, Robson Fernandes de; Arnold, Ulrich; Martı́nez, Leandro; Schuchardt, Ulf; Jannini, Marcelo J. D. M.; Airoldi, Cláudio

doi:10.1016/s0022-3697(03)00276-2

Cited by 31 publications

(10 citation statements)

References 17 publications

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“…Surface area and pore volume values of the supports (table 2) follow the order: DT58 (TiO 2 :WO 3 :SiO 2 = 81:9:10 w/w/w)>DT52 (TiO 2 :WO 3 =91:9 w/w)>DT51 (TiO 2 ), according to the values reported for the single oxides: SiO 2 >WO 3 >TiO 2 [19][20][21]. The surface area and pore volume values of the catalysts before reaction follow the same order, although they are significantly lower than those of the corresponding supports, thus highlighting partial pore occlusion by the metals.…”

Section: Chemical-physic Characterizationmentioning

confidence: 78%

Pd/Pt on Ti-containing Mixed Oxides as Dearomatization Catalysts: Physico-chemical Characterization and Activity

et al. 2005

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Pd/Pt supported on pure and doped TiO 2 (TiO 2 -WO 3 and TiO 2 -WO 3 -SiO 2 ) were prepared and characterized by different techniques (XPS, TEM, XRD, H 2 -TPR and TPD of ammonia). These catalysts were investigated in the hydrogenation of tetralin at 6.0 MPa, checking also their thio-tolerance by feeding increasing amounts of dibenzothiophene (DBT, 300 and 1000 wt ppm). The catalytic activity followed the order: Pd/Pt-TiO 2 > Pd/Pt-TiO 2 -WO 3 -SiO 2 > Pd/Pt-TiO 2 -WO 3 , evidencing a negative role of a second oxide inside TiO 2 . The Pd/Pt-TiO 2 catalyst showed high activity regardless of reaction conditions (temperature, contact time, H 2 /tetralin ratio) together with a good thio-tolerance up to 300 wt ppm of DBT.

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Section: Chemical-physic Characterizationmentioning

confidence: 78%

Pd/Pt on Ti-containing Mixed Oxides as Dearomatization Catalysts: Physico-chemical Characterization and Activity

et al. 2005

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“…The eggyolk arrangement allows the smaller reactant molecules to contact with the active component of the catalyst; this is sometimes used in the case where the reactant stream contains impurity of high molecular weight substance. Both arrangements enable the saving of precious metal (20,21) . The flow sheet of the preparation of impregnation catalysts can be presented in Fig.…”

Section: Preparation Of Catalysts By Impregnation Methodsmentioning

confidence: 99%

Catalysis and Nanotechnologies

2012

Egypt. J. Chem.

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ANOTECHNOLOGY can be understood as a technology of …….design, fabrication and applications of nanostructures and nanomaterials, as well as fundamental understanding of physical properties and phenomena of nanomaterials and nanostructures. Nanomaterials, compared to bulk materials, have the scales ranging from individual atoms or molecules to submicron dimensions at least in one dimension. Nanomaterials and nanotechnology have found the significant applications in physical, chemical and biological systems. The discovery of novel materials, processes, and phenomena at the nanoscale, as well as the development of new experimental and theoretical techniques for research provide plenty of new opportunities for the development of innovative nanostructured materials. Nanostructured materials can be made with unique nanostructures and properties. This field is expected to open new venues in science and technology.

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“…To prepare the porous crystalline materials, the method of sol-gel has also been used. Some materials such as are zeolites (microporous alumosilicates with three-dimensional periodic network structures [36][37][38][39][40]; use of aluminophosphates [41]; zeolite-based membranes with molecular sieving properties [42]; and titanium silicates, such as TS-1, which are important materials for a broad range of applications [43].…”

Section: Synthesis Of Micro and Mesoporous Materialsmentioning

confidence: 99%

Amorphous Porous Mixed Oxides: A New and Highly Versatile Class of Materials

Pandey

Mishra

2012

Intelligent Nanomaterials

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Porous solids are a rapidly developing class of materials with an ever-increasing range of applications. Among these materials, amorphous porous mixed oxides possess the extraordinary properties of fine tuning the chemical composition, microstructure, porosity and surface properties. The tailor made composition of the mixed oxides can be fabricated from the availability of variety of precursor, additives and modifiers. Besides, their performance can be found close to that of crystalline phase. These amorphous mixed oxides can easily be synthesized using acid / base catalyzed one-pot sol-gel procedure. Sol-gel processes allow for a relatively facile tailoring of the morphology of mixed oxides to the desired application in the field of nanotechnology. Pore volume, porosity, specific surface area, and surface acidity are typical parameters that can be tailored. This chapter deals with the preparation methodology, characterization techniques, and application of amorphous porous mixed oxides.

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Synthesis, characterization and catalytic properties of sol–gel derived mixed oxides

Cited by 31 publications

References 17 publications

Pd/Pt on Ti-containing Mixed Oxides as Dearomatization Catalysts: Physico-chemical Characterization and Activity

Pd/Pt on Ti-containing Mixed Oxides as Dearomatization Catalysts: Physico-chemical Characterization and Activity

Catalysis and Nanotechnologies

Amorphous Porous Mixed Oxides: A New and Highly Versatile Class of Materials

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