Influence of the method of preparation of ultrastable y zeolites on extraframework aluminium and the activity and selectivity during the cracking of gas oil

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

OSTI ID:5426831

Corma, A; Herrero, E; Martinez, A; Prieto, J ^[1]

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1. Instituto de Catalisis y Petrolequimica, Serrano, Madrid (Spain)

HY ultrastable zeolites with a framework Si/A1 ratio of about 8, prepared by F{sub 6}Si(NH{sub 4}){sub 2} and steam treatment, have been characterized by i.r. spectroscopy, and their catalytic activity and selectivity for gas oil cracking have been measured. Samples obtained by F{sub 6}Si(NH{sub 4}){sub 2} treatment present only two hydroxyl bands at 3557 (LF) and 3636 (HF) cm{sup {minus}1} in the i.r. spectrum, and very little Lewis acidity and very little extraframework aluminium. After further dealumination by deepbed calcination, two new hydroxyl bands at 3610-3620 and 3690-3700 cm{sup {minus}1} appear, and strong Lewis acidity is observed. The same bands and Lewis acidity are observed in the steam dealuminated zeolite. The comparison of the i.r. spectra and catalytic activity of these two samples with a third one, obtained by citric acid treatment of the steam dealuminated sample, leads us to conclude that there is more than one type of extraframework aluminium: one type is easily removable by mild acid treatment and is catalytically active for bottom conversion and selective for coke and gasoline, and the other, preponderant type, which is more difficult to remove. The relative proportion of the two types of extraframework aluminium is a function of the method of ultrastabilization of the zeolite and the zeolite treatment conditions.

• OSTI ID: 5426831
• 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
ALUMINIUM
CATALYSIS
CATALYSTS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRACKING
DATA
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
GAS OILS
HYDROGEN COMPOUNDS
INFORMATION
INFRARED SPECTRA
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LEWIS ACIDS
MATERIALS
METALS
MINERALS
NUMERICAL DATA
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
PYROLYSIS
REMOVAL
SPECTRA
STEAM
SYNTHESIS
THERMOCHEMICAL PROCESSES
ZEOLITES