Mesoporous mixed oxide catalyst comprising silicon

Patent metadata

Field	Value
Publication number	US-2018200694-A1
Application number	US-201615744106-A
Country	US
Kind code	A1
Filing date	Jul 5, 2016
Priority date	Jul 13, 2015
Publication date	Jul 19, 2018
Grant date	—

Abstract

A mesoporous mixed oxide catalyst that comprises silicon and at least one metal M that is selected from the group that consists of the elements of groups 4 and 5 of the periodic table and mixtures thereof, with the mass of metal M being between 0.1 and 20% of the mixed oxide mass.

First claim

1 . Mesoporous mixed oxide catalyst that comprises silicon and at least one metal M that is selected from the group that consists of the elements of groups 4 and 5 of the periodic table and mixtures thereof, with the mass of metal M being between 0.1 and 20% of the mixed oxide mass, with said mixed oxide resulting from the combination of oxygen atoms with at least the silicon element and the element M.

2 . Catalyst according to claim 1 , in which said metal M is selected from the group that consists of tantalum, niobium, zirconium, and mixtures thereof.

3 . Catalyst according to claim 1 , comprising a metal M′, with said metal M′ being a metal that is selected from the group that consists of the elements of groups 11 and 12 of the periodic table and mixtures thereof, with the mass of metal M′ being between 0.1 and 20% of the mixed oxide mass.

4 . Catalyst according to claim 3 , in which said metal M′ is selected from the group that consists of silver, copper, zinc and mixtures thereof.

5 . Catalyst according to claim 1 , in which said mixed oxide is mesostructured.

6 . Catalyst according to claim 1 , in which the mixed oxide has a specific surface area of at least 250 m 2 /g, a pore volume of at least 1 ml/g and a mean pore diameter of at least 4 nm.

7 . Catalyst according to claim 1 that is shaped in the form of balls, pellets, granules, or extrudates, or rings.

8 . Catalyst according to claim 7 , comprising at least one porous oxide material that has the role of binder, with said porous oxide material being selected from the group that is formed by silica, magnesia, clays, titanium oxide, lanthanum oxide, cerium oxide, boron phosphates, and mixtures of at least two of the oxides cited above.

9 . Method for preparation of the catalyst according to claim 1 via the metallo-organic modern sol-gel path by precipitation/gelling that comprises at least the following steps:
(a) Dissolution of at least one alkoxide precursor of formula Si(OR) 4-a R′ a , where R═H, methyl, ethyl and R′ is an alkyl chain or a functionalized alkyl chain of the element Si in aqueous, organic or aquo-organic medium, optionally in the presence of an acid or a base, so as to form an optionally colloidal solution,
(b) Addition to the solution that is obtained during the operation (a) of at least one precursor of the metal M, in the pure state or dissolved in a suitable medium that is compatible with said solution that is obtained from the operation (a),
(c) Precipitation of the Si-based mixed oxide, at least the metal M by the addition of an acid, a base, or by application of a specific reaction temperature,
(d) Filtration followed by optional washing cycles or evaporation of the suspension
that is obtained during the operation (c),

(e) At least one heat treatment of the mixed oxide that is obtained in step (d) so as to obtain said catalyst.

10 . Method for preparation of the catalyst according to claim 9 , in which said heat treatment step (e) is a drying followed by a calcination, with said drying being carried out in an oven in a temperature range of 20 to 200° C. during a period of less than 72 hours, with said calcination step being carried out in air in an oven in a temperature range of 300 to 800° C. during a period of less than 24 hours.

11 . A process for the production of 1,3-butadiene from a feedstock that comprises at least ethanol, comprising contacting said feedstock with a catalyst according to claim 1 , at a temperature of between 300 and 400° C., a pressure of between 0.15 and 0.5 MPa, and a volumetric flow rate of between 0.5 and 5 h −1 .

12 . The process according to claim 11 , in which the temperature is between 320° C. and 380° C.

13 . The process according to claim 11 , in which the pressure is between 0.15 and 0.3 MPa.

14 . The process according to claim 11 , in which the volumetric flow rate is between 1 and 4 h −1 .

Assignees

• Ifp Energies Now
• Michelin & Cie

Inventors

• Cadran Nicolas
• Chaumonnot Alexandra
• Lambert Arnold

Classifications

• B01J37/10

  in the presence of water, e.g. steam · CPC title

• C07C2523/06

  of zinc, cadmium or mercury · CPC title

• B01J37/036

  to form a gel or a cogel · CPC title

• C07C2523/20

  Vanadium, niobium or tantalum · CPC title

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title