Direct hydrothermal synthesis of palladium-incorporated silicate-structured mesoporous catalysts

2007-01-01
Sener, Canan
Doğu, Timur
Dogu, Guelsen
Pd-Si-structured novel mesoporous nanocomposite catalytic materials, having quite high Pd/Si ratios, were synthesized by an acidic direct hydrothermal synthesis route. The nanocomposite catalytic materials were then characterized by XRD, XPS, EDS, nitrogen adsorption, and SEM techniques. Unlike MCM-41, the XRD patterns indicated a rather wide d((100)) band at a 2 theta value of about 1.9. The materials, with very high Pd/Si wt ratios between 1.43 and 2.66, were synthesized and had BJH surface area values between 600 and 200 m(2)/g. The pore size distributions of these materials were also quite narrow, indicating pores between 2 and 7 nm.
TURKISH JOURNAL OF CHEMISTRY

Suggestions

Hydrothermal synthesis of hydroxyapatite from calcium sulfate hemihydrate
Bıngol, Onur Rauf; Durucan, Caner (2012-08-01)
Commercial grade calcium sulfate hemihydrate (CaSO4·0.5H2O, or plaster of paris, PoP) an economically feasible and abundant precursor has been used in (Ca10(PO4)6(OH)2, HAp) synthesis. The synthesis was realized by reacting solid PoP precursor with 1M of (NH4)2HPO4 aqueous solution, at ambient and mild hydrothermal conditions (2 ± 0.2 atm and 120 °C). The effect of reaction temperature and pressure on PoP to HAp conversion efficiencies and reaction kinetics has been reported. The formation of HAp at a react...
Direct synthesis of hydrogen storage alloys from their oxides
Tan, Serdar; Öztürk, Tayfur; Aydınol, Mehmet Kadri; Department of Metallurgical and Materials Engineering (2011)
The aim of this study is the synthesis of hydrogen storage compounds by electrodeoxidation technique which offers an inexpensive and rapid route to synthesize compounds from oxide mixtures. Within the scope of this study, two hydrogen storage compounds, FeTi and Mg2Ni, are aimed to be produced by this technique. In the first part, effect of sintering conditions on synthesis of FeTi was studied. For this purpose, oxide pellets made out of Fe2O3-TiO2 powders were sintered at temperatures between 900 °C – 1300...
Hydrothermal and microwave synthesis of boron phosphate, BPO(4)
Baykal, Altan; Toprak, M; Kniep, R (2001-01-01)
BPO4 was previously synthesized by the solid state reactions of (NH4)(2)HPO4 and B2O3 at 1000 degreesC and was characterized by X-ray powder diffraction and IR methods. We have now succeeded in preparing BPO4 from H3BO3 and P2O5 using hydrothermal synthesis by heating at 160 degreesC for 2 days and obtained a single phase product. We observed that a microwave-assisted synthesis takes only 3 to 5 minutes to transform a solid mixture of (NH4)(2)B4O7. 4H(2)O, and solid H3PO4 Or B2O3 + P2O5 into the crystalline...
Oxygen plasma modification of polyurethane membranes
Ozdemir, Y; Hasırcı, Nesrin; Serbetci, K (2002-12-01)
Polyurethane membranes were prepared under nitrogen atmosphere by using various proportions of toluene diisocyanates (TDI) and polypropylene-ethylene glycol (P) with addition of no other ingredients such as catalysts, initiator or solvent in order to achieve medical purity. Effects of composition on mechanical properties were examined. In general, modulus and UTS values demonstrated an increase and PSBR demonstrated a decrease as the TDI/Polyol ratio of the polymer increased. Elastic modulus, ultimate tensi...
Steady-state parallel plate apparatus for measurement of diffusion coefficient in supercritical carbon dioxide
Tuan, DQ; Yener, Meryem Esra; Zollweg, JA; Harriott, P; Rizvi, SSH (1999-02-01)
A new, steady-state experimental system for measurement of the Fickian diffusion coefficients for solutes in supercritical carbon dioxide (SC-CO2) was designed and evaluated. Mass transfer between a Liquid solute and SC-CO2 was carried out in a parallel plate geometry where a porous metal sheet, immersed in the liquid phase, stabilized the interface. The SC-CO2 flowed over the porous metal sheet containing the liquid phase which was presaturated with CO2. The use of the porous metal sheet and a thin mobile ...
Citation Formats
C. Sener, T. Doğu, and G. Dogu, “Direct hydrothermal synthesis of palladium-incorporated silicate-structured mesoporous catalysts,” TURKISH JOURNAL OF CHEMISTRY, pp. 473–478, 2007, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53510.