Centre National De La Recherche Scientifique

Totalenergies Onetech

Florent Dubray

Nikolai Nesterenko

Jean-Pierre Gilson

Svetlana Mintova

Delphine Minoux

Julien Grand

Cindy Aquino

Stijn Van Daele

Stanislav Konnov

The present disclosure relates to a novel staged-synthesis method for introduction of various metals in the structure of zeolite frameworks by isomorphous substitution. This new method is based on a hydrothermal synthesis in which the metal addition to the precursor suspensions (gel) is delayed. This so-called 'staged-synthesis method' allows to obtain nanosized silanol highly homo-geneous crystalline zeolite structures with a control of the metal location.

Isomorphous substitution of metals during the synthesis of a zeolite framework

Process for the conversion of non-oxidative coupling of methane to ethylene, under non-oxidative conditions, comprising: providing a first stream containing at least 50 vol. % of methane based on the total volume of said first stream; providing a catalyst; putting in contact said first stream with said catalyst at a weight hour space velocity ranging from 0.5 to 100 h, a temperature ranging from 500&#xb0; C. to 1100&#xb0; C. and a pressure ranging from 0.1 MPa to 5 Mpa in the absence of oxygen; recovering a second stream containing unconverted methane if any, ethylene and hydrocarbons having at least 2 carbon atoms. Said process is remarkable in that said catalyst is a synthetic zeolite material, containing at least one metal M with silicon to metal M molar ratio Si/M as determined by inductively coupled plasma optical emission spectrometry ranging from 100 to 65440 and in that said metal M is incorporated inside of the zeolite tetrahedral sites.

Non-oxidative conversion of methane into ethylene using isomorphous metal-substituted zeolite framework catalyst

The present disclosure relates to a novel method for introducing various metals in the structure of zeolite frameworks by isomorphous substitution. This new method is based on a hydrothermal reaction of the metal with the zeolite. This method allows obtaining zeolite with a structure and with control of the metal location.

Isomorphous substitution of metals on synthesized zeolite framework

Growing community of inventors

Caen, France

Florent Dubray