Institut Francais Du Pe'trole

Societe Nationale Elf Aquitaine

Rhone-Poulenc Chimie

Institute Francais Du Petrole

Institut Francias Du Petrole

Jean-Louis Guth

Francis Raatz

Jean-Francois Joly

Catherine Zivkov

Anne-Catherine Faust

Joel Patarin

Philippe Caullet

Henri Kessler

Didier Anglerot

Eric Benazzi

Jean-Paul Bournonville

Laurent Petit

Francois Delprato

Christine Travers

Christian Streicher

Alain Methivier

Jean-Michel Popa

Thierry Des Courieres

Fr&eacute;d&eacute;ric Kolenda

Ronan Le Dred

Frederique Hoffner

Francois Dougnier

Sabine Valange

Zelimir Gabelica

Martine Anstett

Alain Seive

Pierre Dufresne

Michel Costantini

Sylvie Lacombe

Jean-Marie Deves

Loic Rouleau

Herve Cauffriez

Nathalie Brunard

Jacques Baron

Francois Deloprato

Anne C Faust

Z&eacute;limir Gabelica

Didier Auglerot

Frederic Kolenda

Beatrice Feron

Adballah Merrouche

Annie Lopez

Pierre-Yves Legoff

Jean-Marc Lamblin

Gisele Coudurier

The invention concerns a process for synthesising aluminas with a controlled porosity in which the pore diameter is in the range 0.6 nm to 80 nm. This process is carried out in a plurality of steps including at least one step a) in which an alumina precursor is prepared by hydrolysis of at least one anionic inorganic source of aluminium in the presence of at least one surfactant. Step a) of the process is carried out in an essentially aqueous medium the pH of which is generally higher than the isoelectric point of the alumina. The process of the invention also comprises at least one step b) in which the precipitate obtained is dried in air at a temperature of about 40&deg; C. to 110&deg; C. for a period of about 2 to 30 hours, and at least one step c) in which the dried precipitate is calcined at a temperature which is sufficient to eliminate the molecules of surfactant present in the precursor.

Process for synthesising aluminas in a basic medium

Hydrated aluminium compounds of the present invention are represented by the general formula nS, mM, Al,O,, xH,O where S is a surfactant or a group of surfactants, n is the number of moles of S, M is an alkaline cation, preferably selected from the group formed by Na,, K,, NH,, m is the number of moles of M and x is the number of moles of water. The hydrated compounds are obtained from inorganic aluminium sources which are in the form of cation-monomers and/or cation-oligomers. The surfactants are anionic and/or non-ionic surfactants. When the group of surfactants comprises at least one anionic surfactant, at least one cationic surfactant can optionally be added.

Hydrated aluminum compounds, their preparation and use thereof

Process for the production of zeolite membranes supported on porous glass and a zeolite membrane so produced

A process for the production of a controlled supported zeolite membrane comprises: (a) forming a gel which is principally localised at the surface of a porous support by bringing it into contact, in succession, with two immiscible liquids which contain the agents necessary for formation of said gel, then (b) crystallising the zeolite from said gel and finally (c) eliminating the residual agents. The supported zeolite membranes obtained are advantageously used in continuous gas separation processes.

Process for the production of supported zeolite membranes, and zeolite

The invention concerns IM-5 zeolite with a chemical composition with the following formula, expressed in terms of the mole ratios of the oxides for the anhydrous state: 100XO.sub.2,mY.sub.2 O.sub.3, pR.sub.2/n O where m is 10 or less; p is in the range 0 to 20; R represents one or more cations with valency n; X represents silicon and/or germanium; Y represents one or more of the following elements: aluminum, iron, gallium, boron and titanium. The zeolite is characterized by an Xray diffraction diagram, in its as synthesized state, which comprises the results shown in Table 1 of the description. The invention also concerns the preparation of the zeolite, any catalyst containing the zeolite and any catalytic process using such a catalyst.

IM-5 zeolite, a process for its preparation and catalytic applications

The invention concerns a process for the synthesis of zeolites based on element(s) T and mesoporous solids based on element(s) T, T being silicon and/or aluminium, comprising the following sequence of steps: i) synthesizing a reaction medium which is a homogeneous source of element(s) T containing:

Process for the synthesis of zeolites and mesoporous solids from a

Process for the synthesis of faujasite, having a Si/Al ratio greater than 1 and which can exceed 3, in the presence of a structuring agent consisting of at least one carbonaceous macrocycle having 10 to 24 atoms per ring and containing heteroatoms chosen from oxygen, nitrogen, sulphur or silicon, the macrocycle being introduced into the reaction medium in the form of a crude synthetic sodium complex.

Process for the synthesis of zeolites belonging to the faujasite

Microporous crystallized gallium phosphate and its substituted derivatives, characterized by:

Crystallised microporous gallium phosphate and its substituted

Calcined silica/oxide zeolites, characteristically MFI stannozeosilites or zirconozeosilites, well adopted for catalyzing the H.sub.2 O.sub.2 hydroxylation of phenols or phenol ethers, have the formula (I):

Stannozeosilite/zirconozeosilite zeolites and catalytic hydroxylation of

A process is provided for the preparation of zeolites belonging to the faujasite structural class and exhibiting a Si:Al ratio higher than 1 in which a reaction mixture is first produced, which has a pH higher than 10 and contains water, a source of tetravalent silicon, a source of trivalent aluminum, a source of hydroxide ions in the form of a strong inorganic or organic base and a structuring agent ST so as to produce an aluminosilicate gel having the desired composition to permit its crystallization into a compound of the faujasite structural class. The gel obtained is kept at a temperature, pressure and for a sufficient period to effect the crystallization of the gel into a precursor of the zeolite consisting of the zeolite trapping the structuring agent ST in its cavities and the precursor is then subjected to a calcination to destroy the structuring agent and to produce the zeolite. The structuring agent ST consists of at least one compound belonging to the group formed by the carbon-containing macrorings and macropolyrings which contain in the rings heteroatoms chosen from oxygen, nitrogen, silicon and sulphur, and which contain 10 to 24 atoms per ring. Precursors of the zeolites are also provided.

Synthesis of zeolites of faujasite structure

An aluminosilicate gel containing a structuring agent ST and having a composition appropriate for crystallizing as a zeolite of the faujasite structural family is prepared and then subjected to a crystallization to form a zeolite precursor consisting of the said zeolite containing the structuring agent ST in its cavities and channels, and zeolite is produced by calcination of the said precursor. The structuring agent ST consists of at least one compound chosen from the polyalkylene oxides of the formula ##STR1## in which R and R', which are identical or different, each represent H or a C.sub.1 to C.sub.4 alkyl radical, X denotes H or OH, m is equal to 2 or 3 and may be different from one unit to the next and n is a number larger than 12 and preferably between 25 and 800. The zeolites obtained have a Si:Al ratio which is larger than 1 and may exceed 3 and they have a cubic symmetry. These zeolites are usable, directly or after cation exchange, as adsorbents or as catalyst components.

Process for the synthesis of zeolites having an aluminosilicate

An aluminosilicate gel containing a structuring agent ST and having a composition appropriate for crystallizing as a zeolite of the faujasite structural family is prepared, and then subjected to a crystallization to form a zeolite precursor consisting of the said zeolite containing the structuring agent ST in its cavities and channels, and zeolite is produced by calcination of the said precursor. The structuring agent ST consists of at least one compound chosen from the polyoxaalkylamines and/or polyoxaarylamines of general formula:

Novel calcined zeolites of MFI type, based on silica and germanium oxide, are well adapted for the catalysis, e.g., of hydrogenolysis, hydrogenation and reforming reactions, and have the general formula:

Silica/germanium oxide zeolites

MTW-type zeolite and its preparation process

MFI-type zeolite and its preparation process

Growing community of inventors

Mulhouse, France

Jean-Louis Guth