Beta-zeolite structural properties and activity and selectivity for catalytic cracking

Conference · Sat Aug 01 04:00:00 EDT 1987 · American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA)

OSTI ID:5283647

Corma, A; Fornes, V; Melo, F; Pelez-Pariente, J ^[1]

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1. Instituto de Catalisis y Petroleoquimica, Madrid (Spain)

A series of beta-zeolites has been synthesized in the presence of tetraethylammonium hydroxide (TEAOH). Samples with Si/A1 ratio in the 8-106 range have been characterized by X-ray powder diffraction, i.r. spectroscopy and pyridine adsorption. It has been found that a fraction of the tetraethylammonium (TEA) ion is compensating the charge of the framework aluminium atoms, and it is removed at temperature higher than a second fraction of TEA which is occluded in the structure. Calcination of the samples at temperatures > 550{degree}C causes the formation of structural defects or the breaking of crystallites, with the corresponding increase in the number of silanol groups (3740 cm{sup {minus}1}, i.r. band). Hydroxyl bands at 3615 and 3680 cm{sup {minus}1} are observed, the first being much more intense and directly proportional to the number of framework aluminiums. Pyridine interacts strongly with the 3615 cm{sup {minus}1} band, hydroxyls, and weakly with the 3680 cm{sup {minus}1} ones. Deepbed calcination of the samples produces a decrease in the intensity of the 3615 cm{sup {minus}1} band, probably due to partial dealumination; the presence of pyridine bonded to Lewis acid sites is an agreement with this assumption. Comparison of the catalytic properties of H-beta and HY zeolites for cracking n-heptane and gas oil show that beta-zeolite should have more than one type of channel, with different dimensions. For gas-oil cracking, beta-zeolite is less active and produces more coke and less gasoline than HY zeolite.

• OSTI ID: 5283647
• Report Number(s): CONF-8708311--
• Conference Information: Journal Name: American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA) Journal Volume: 32:3
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ADSORPTION
ALKANES
CATALYSIS
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
CRACKING
DATA
DECOMPOSITION
DIFFRACTION
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
GAS OILS
HEPTANE
HYDROCARBONS
INFORMATION
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
PYROLYSIS
SCATTERING
SORPTION
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
THERMOCHEMICAL PROCESSES
X-RAY DIFFRACTION
ZEOLITES