Activity of Ti-Beta Catalyst for the Selective Oxidation of Alkenes and Alkanes

Ti-Beta zeolites with different titanium and aluminum contents have been prepared by changing the concentration of Ti and Al in the synthesis gel and the crystallization time. The gels were prepared from Aerosil as silica source. Ti-Beta samples were characterized by XRD, I.R., SEM, and diffuse refl...

Full description

Saved in:
Bibliographic Details
Published in:Journal of catalysis 1994, Vol.145 (1), p.151-158
Main Authors: Corma, A., Camblor, M.A., Esteve, P., Martinez, A., Perezpariente, J.
Format: Article
Language:English
Subjects:
02 PETROLEUM
020400 - Petroleum- Processing
400201 - Chemical & Physicochemical Properties
ALKANES
ALKENES
Catalysis
CATALYST SUPPORTS
Catalysts: preparations and properties
CATALYTIC EFFECTS
CHEMICAL REACTIONS
Chemistry
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
Exact sciences and technology
General and physical chemistry
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MICROSCOPY
ORGANIC COMPOUNDS
OXIDATION
SCANNING ELECTRON MICROSCOPY
SCATTERING
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ti-Beta zeolites with different titanium and aluminum contents have been prepared by changing the concentration of Ti and Al in the synthesis gel and the crystallization time. The gels were prepared from Aerosil as silica source. Ti-Beta samples were characterized by XRD, I.R., SEM, and diffuse reflectance (DR) spectroscopy in the UV-visible region. According to the characterization data, in the calcined dehydrated samples, titanium is incorporated into the framework of the zeolite Beta in a tetracoordinated state. No anatase phase was observed in the DR spectra. The catalytic activity for the selective oxidation by H 2O 2 of alkanes and alkenes with different molecular sizes was measured and compared with that of TS-1 under the same experimental conditions. For molecules whose diffusion is not restricted in either MFI or BEA structures, the intrinsic activity of the Ti centers is lower in Ti-Beta than in TS-1. However, the large-pore Ti-Beta catalyst shows superior activity compared to the medium-pore TS-1 for the oxidation of bulkier molecules.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1994.1017