Direct synthesis and characterization of hydrophobic aluminum-free Ti-beta zeolite
Article Abstract:
Experiments were performed to investigate the physicochemical properties of aluminum-free titanium-beta zeolites (Ti-Beta). The synthesis of the zeolites and their catalytic behavior were examined. No competition in the crystalline phases were detected by X-ray diffraction studies. The findings demonstrate the feasibility of integrating titanium in pure silica and aluminosilicate zeolite Beta in fluoride medium. Moreover, differences in the synthesis of Beta materials in fluoride and hydroxide media were observed which in turn influence the polar character of the samples.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Surface segregation in supported Pd-Pt nanoclusters and alloys
Article Abstract:
Surface segregation mechanisms in Pd-Pt alloys and bimetallic Pd-Pt nanoclusters on alumina and carbon supports were studied by obtaining the metal surface composition of these systems through low-energy ion scattering. Pd surface segregation was enhanced by heating the alloys in hydrogen or oxygen, and thermodynamic equilibrium was attained at approximately 400-500 deg C. For Pd-Pt catalysts with low metal dispersions of about 0.3 and 0.8, pd surface segregation occurred during heating in hydrogen to about the same extent as in the Pd-Pt bulk alloys.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Synthesis and characterization of acidic high-silica faujasite-type gallosilicates
Article Abstract:
It is much more difficult to insert gallium into faujasite (FAU)-type silicas than to insert aluminium. FAU-type gallosilicates are inert to ammonium hexafluorosilicate.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Two-stage melting of Au-Pd nanoparticles. Synthesis and characterization of taper- and rodlike Si nanowires on Si(sub x)Ge(sub 1-x) substrate
- Abstracts: Ultrasonic and densimetric characterizations of the hydration properties of polar groups in monosaccharides. Hydrophobic hydration in cyclodextrin complexation
- Abstracts: Transition-state theory rate calculations with a recrossing-free moving. Standard thermodynamic properties of [H.sub.3]P[O.sub.4](aq) over a wide range of temperatures and pressures
- Abstracts: Direction control of chemical wave propagation in self-oscillating gel array. Dependence of turbidity oscillations of self-oscillating polymers on the selective recognition of the crown ether receptors contained in the polymer chain
- Abstracts: SER spectrum: a novel information imaging to characterize molecular dynamics of NO2 on Na-Mordenite. Molecular dynamics of C60 in cocrystals of C60 and p-bromocalix[4]arene propyl ether