POROUS MONOLITH CONTAINING TiO2 AND METHOD FOR THE PRODUCTION THEREOF

Patent metadata

Field	Value
Publication number	US-2021101133-A1
Application number	US-201816608312-A
Country	US
Kind code	A1
Filing date	Apr 23, 2018
Priority date	Apr 28, 2017
Publication date	Apr 8, 2021
Grant date	—

Abstract

The invention relates to a porous monolith comprising between 20 wt.-% and 70 wt.-% Ti0 2 relative to the total weight of the monolith, and between 30 wt.-% and 80 wt.-% a refractory oxide, selected from silica, alumina or silica-alumina, relative to the total weight of the monolith, characterized in that said porous monolith has a bulk density of less than 0.19 g/mL.

First claim

1 . A porous monolith comprising between 20% and 70% by weight of TiO 2 relative to the total weight of the monolith, between 30% and 80% by weight of a refractory oxide selected from silica, alumina or silica-alumina relative to the total weight of the monolith, characterized in that said porous monolith comprises a bulk density of less than 0.19 g/ml.

2 . The monolith as claimed in claim 1 , characterized in that said porous monolith comprises a bulk density of less than 0.16 g/ml.

3 . The monolith as claimed in claim 1 , characterized in that it comprises a mesoporous volume of from 0.1 to 1 ml/g for a pore diameter between 0.2 and 50 nm.

4 . The monolith as claimed in claim 1 , characterized in that it comprises a type-I macroporous volume, of which the pore diameter is greater than 50 nm and less than or equal to 1000 nm, of between 0.1 and 3 ml/g.

5 . The monolith as claimed in claim 1 , characterized in that it comprises a type-II macroporous volume, of which the pore diameter is greater than 1 μm and less than or equal to 10 μm, of between 0.1 and 8 ml/g.

6 . The monolith as claimed in claim 1 , characterized in that it comprises a mesoporosity and/or a type-I macroporosity and/or a type-II macroporosity.

7 . The monolith as claimed in claim 1 , characterized in that it also comprises a macroporous volume of less than 0.5 ml/g for a pore diameter of greater than 10 μm.

8 . The monolith as claimed in claim 1 , characterized in that it comprises a BET specific surface area of between 150 and 700 m 2 /g.

9 . The monolith as claimed in claim 1 , characterized in that it also comprises at least one element M selected from an element of groups IA, IIA, VIIIB, IB and IIIA of the periodic table of the elements in the metal or oxidized state, alone or as a mixture.

10 . The monolith as claimed in claim 9 , in which the content of element(s) M is between 0.001% and 20% by weight relative to the total weight of the porous monolith.

11 . The monolith as claimed in claim 1 , characterized in that it also comprises one or more doping elements selected from metal elements, such as for example elements V, Ni, Cr, Mo, Fe, Sn, Mn, Co, Re, Nb, Sb, La, Ce, Ta or Ti, non-metal elements, such as for example C, N, S, F or P, or a mixture of metal and non-metal elements.

12 . The monolith as claimed in claim 11 , in which the content of doping element is between 0.001% and 5% by weight relative to the total weight of the porous monolith.

13 . A process for preparing a porous monolith as claimed in claim 1 , comprising the following steps:
a) a solution containing a surfactant is mixed with an acidic aqueous solution so as to obtain an acidic aqueous solution comprising a surfactant; b) at least one silicon and/or aluminum precursor is added to the solution obtained in step a); c) at least one liquid organic compound that is immiscible with the solution obtained in step b) is added to the solution obtained in step b) so as to form an emulsion; d) the emulsion obtained in step c) is left to mature in the wet state so as to obtain a gel; e) the gel obtained in step d) is washed with an organic solution; f) the gel obtained in step e) is dried and calcined so as to obtain a porous monolith; g) a solution comprising at least one soluble titanium precursor is impregnated in the porosity of the porous monolith obtained in step f); h) optionally, the porous monolith obtained in step g) is left to mature in the wet state; i) the porous monolith obtained in step g) or h) is dried and calcined so as to obtain a porous monolith containing TiO 2 .

14 . The process as claimed in claim 13 , wherein, in step i), drying is carried out at a temperature of between 5 and 80° C. and calcining is carried out at a temperature of between 300 and 1000° C.

15 . The process as claimed in claim 13 , wherein, in step i), calcining is carried out in two consecutive steps: a first temperature stationary phase of between 120 and 250° C. for 1 to 10 hours, then a second temperature stationary phase of between 300 and 950° C. for 2 to 24 hours.

Assignees

• Ifp Energies Now

Inventors

• Bernadet Sophie
• Fecant Antoine
• Uzio Denis
• Backov Renal-Vasco
• Ravaine Serge

Classifications

• B01J35/32

  Bulk density · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/56

  Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths · CPC title

• C04B38/0067

  characterised by the density of the end product · CPC title

• C04B38/0051

  characterised by the pore size, pore shape or kind of porosity · CPC title