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

Abstract

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 methodmore » of ultrastabilization of the zeolite and the zeolite treatment conditions.« less

Authors:
; ; ;  [1]
  1. Instituto de Catalisis y Petrolequimica, Serrano, Madrid (Spain)
Publication Date:
OSTI Identifier:
5426831
Report Number(s):
CONF-8708311-
Journal ID: ISSN 0569-3799; CODEN: ACPCA
Resource Type:
Conference
Journal Name:
American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA)
Additional Journal Information:
Journal Volume: 32:3; Conference: Symposium on advances in FCC, New Orleans, LA (USA), 30 Aug - 4 Sep 1987; Journal ID: ISSN 0569-3799
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; ALUMINIUM; REMOVAL; CATALYSTS; CHEMICAL PREPARATION; GAS OILS; CATALYTIC CRACKING; ZEOLITES; CATALYTIC EFFECTS; CATALYSIS; EXPERIMENTAL DATA; INFRARED SPECTRA; LEWIS ACIDS; STEAM; CHEMICAL REACTIONS; CRACKING; DATA; DECOMPOSITION; ELEMENTS; ENERGY SOURCES; FOSSIL FUELS; FUELS; HYDROGEN COMPOUNDS; INFORMATION; INORGANIC ACIDS; INORGANIC ION EXCHANGERS; ION EXCHANGE MATERIALS; MATERIALS; METALS; MINERALS; NUMERICAL DATA; PETROLEUM; PETROLEUM FRACTIONS; PETROLEUM PRODUCTS; PYROLYSIS; SPECTRA; SYNTHESIS; THERMOCHEMICAL PROCESSES; 020400* - Petroleum- Processing

Citation Formats

Corma, A, Herrero, E, Martinez, A, and Prieto, J. Influence of the method of preparation of ultrastable y zeolites on extraframework aluminium and the activity and selectivity during the cracking of gas oil. United States: N. p., 1987. Web.
Corma, A, Herrero, E, Martinez, A, & Prieto, J. Influence of the method of preparation of ultrastable y zeolites on extraframework aluminium and the activity and selectivity during the cracking of gas oil. United States.
Corma, A, Herrero, E, Martinez, A, and Prieto, J. Sat . "Influence of the method of preparation of ultrastable y zeolites on extraframework aluminium and the activity and selectivity during the cracking of gas oil". United States.
@article{osti_5426831,
title = {Influence of the method of preparation of ultrastable y zeolites on extraframework aluminium and the activity and selectivity during the cracking of gas oil},
author = {Corma, A and Herrero, E and Martinez, A and Prieto, J},
abstractNote = {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.},
doi = {},
journal = {American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA)},
issn = {0569-3799},
number = ,
volume = 32:3,
place = {United States},
year = {1987},
month = {8}
}

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