Ni-MCM-41 type mesoporous catalysts synthesized by one-pot hydrothermal procedure for steam reforming of ethanol

Ozdogan, Ekin
Doğu, Timur
In the present study, Ni incorporated MCM-41 structured mesoporous catalysts with a Ni/Si atomic ratio of 0.036 and 0.15 were prepared by a direct hydrothermal synthesis procedure. These catalysts had surface area values of 860.5 m(2)/g (Ni-MCM-41 having a Ni/Si ratio of 0.036) and 944.9 m(2)/g (Ni-MCM-41 having a Ni/Si ratio of 0.15). They also had narrow pore size distributions with average pore diameters of 2.7-2.6 nm respectively. Ni MCM-41 synthesized by the one-pot hydrothermal synthesis procedure showed very high activity and relatively high hydrogen yield in steam reforming of ethanol in a temperature range between 300-550 degrees C. Besides the steam reforming reaction, formation of some formaldehyde and small amounts of ethylene were also observed at low temperatures for the catalyst containing a Ni/Si ratio of 0.036. The disappearance of formaldehyde and the formation of some methane at high temperatures indicated the increased significance of cracking in addition to reforming and dehydration reactions. The increase of the Ni/Si ratio makes the catalyst more active at lower temperatures.


Direct hydrothermal synthesis of palladium-incorporated silicate-structured mesoporous catalysts
Sener, Canan; Doğu, Timur; Dogu, Guelsen (2007-01-01)
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 be...
Synthesis and characterization of Ba/MCM-41
Kaya, Emine; Oktar, Nuray; Karakaş, Gürkan; Murtezaoglu, Kirali (2010-01-01)
Mesoporous Ba/MCM-41 type materials (Ba/MCM-41) with high Ba/Si molar ratios between 0.025 and 0.1 were synthesized by direct hydrothermal synthesis. The samples were characterized by XRD, nitrogen adsorption, TGA-DTA, FTIR, SEM-EDS, and TEM techniques. BET surface areas of samples with various Ba loadings were found between 722 and 931 m(2)/g with 28 A average pore size, which is consistent with the pore size of 30 A for pure MCM-41 samples synthesized by the same procedure. The crystal structures of synth...
Poly(hydroxybutyrate-co-hydroxyvalerate) nanocapsules as enzyme carriers for cancer therapy: an in vitro study
Baran, ET; Ozer, N; Hasırcı, Vasıf Nejat (2002-05-01)
In the present paper, poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nanocapsules were prepared by a double emulsion-solvent evaporation procedure (w/o/w) for the encapsulation of model enzymes (L-asparaginase, catalase, glucose oxidase) and bovine serum albumin. To increase the encapsulation efficiency and activity of the encapsulated enzyme, numerous modifications were made in the compositions of the phases of double emulsion. For the preparation of low molecular weight PHBV, the polymer was treated with so...
Modified Hantzsch Reaction in the Presence of Chiral Organic Catalysts
Magerramov, A. M.; Guseinov, E. Z.; Akhmedov, I. M.; Tanyeli, Dj.; Kurbanova, M. M. (2016-05-01)
Modified Hantzsch reaction in three- and four-component system in the presence of new chiral organic catalysts was investigated and the advantages of this reaction in three- component system compared to four-component one were demonstrated, the influence of catalysts on the dynamics and stereochemistry of the reaction was elucidated. The enantiomeric excess of the main reaction product was evaluated with HPLC, its structure was proved by X-ray diffraction analysis.
Cr Incorporated MCM-41 Type Catalysts for lsobutane Dehydrogenation and Deactivation Mechanism
Kilicarslan, Saliha; DOĞAN, MELTEM; Doğu, Timur (2013-03-13)
Cr incorporated MCM-41 type catalysts, which were prepared by direct hydrothermal synthesis and impregnation routes, were tested for dehydrogenation of isobutane. Among the surfactants (C17H38BrN, C19H42BrN, and C32H68BrN) used in the synthesis of MCM-41, C19H42BrN gave the best structure with ordered mesopores. Characterization results proved that chromium was very well dispersed within the MCM-41 lattice of the synthesized catalysts. In all of the synthesized catalysts, the presence of Cr6+ (2p(3/2)) in t...
Citation Formats
E. Ozdogan, T. Doğu, and G. DOĞU, “Ni-MCM-41 type mesoporous catalysts synthesized by one-pot hydrothermal procedure for steam reforming of ethanol,” INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING, pp. 0–0, 2007, Accessed: 00, 2020. [Online]. Available: