EP3615203A1 - Procede de preparation d'un monolithe a porosite multimodale - Google Patents
Procede de preparation d'un monolithe a porosite multimodaleInfo
- Publication number
- EP3615203A1 EP3615203A1 EP18724474.4A EP18724474A EP3615203A1 EP 3615203 A1 EP3615203 A1 EP 3615203A1 EP 18724474 A EP18724474 A EP 18724474A EP 3615203 A1 EP3615203 A1 EP 3615203A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- semiconductor
- temperature
- polymer particles
- particles
- aqueous suspension
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen; Reversible storage of hydrogen
- C01B3/02—Production of hydrogen; Production of gaseous mixtures containing hydrogen
- C01B3/04—Production of hydrogen; Production of gaseous mixtures containing hydrogen by decomposition of inorganic compounds
- C01B3/042—Decomposition of water
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Definitions
- the field of the invention is that of materials with a hierarchical structure. More particularly, the present invention relates to a method for preparing a multimodal porosity monolith containing at least one inorganic semiconductor.
- A. Araya et al. (US Patent 4888309, 1981) and A. Imhof et al. (Nature, vol 389, 30 October 1997, pp. 948-952) describe the implementation of sol-gel processes from alkoxides dissolved in an alcohol and hydrolysed by addition of a small amount of water, being recalled that most alkoxides are very reactive with water and do not give stable emulsions.
- This document also describes the preparation of monodisperse macroporous materials of titanium oxide, zirconia or silica with pore diameters between 50 nm and several microns, from a monodisperse oil emulsion in formamide.
- a patent application WO2015 / 1 10772 describes the use of a material based on N-TiO 2 in the form of a porous monolith as a photocatalyst for the degradation of pollutants in the air or in the water under radiation in the visible spectrum or for the cracking of water in H 2 under radiation in the visible spectrum.
- Another patent application FR2975309 describes a mode of preparation of porous monolith containing TiO 2 and its use as a photocatalyst for the degradation of pollutants in air or in water under irradiation.
- inorganic semiconductor reactive precursors such as alcoholates
- the invention relates to a process for the preparation of multimodal porosity monolith containing at least one inorganic semiconductor.
- the method of preparation employs polymer particles as a blowing agent.
- Said method of preparation implements a powder of one or more semiconductor precursors in their oxide form.
- Said preparation process is carried out according to the following method:
- the monolith prepared according to the invention contains 10 to 100% by weight of inorganic semiconductor relative to the total weight of the porous monolith, preferably from 20 to 100% by weight.
- the bandgap of inorganic semiconductors is generally between 0.1 and 4.0 eV.
- the semiconductor is a metal oxide.
- said porous monolith may comprise preferably a refractory oxide selected from alumina, silica or silica-alumina, or any other material which is not an inorganic semiconductor.
- the metal of the inorganic semiconductor may be chosen from one or more elements of groups IB, MB, IVA, VA, VIA, IVB, VB, VIB, VIIIB or NIA.
- a semiconductor is selected from Fe 2 0 3, SnO, the Sn0 2, Ti0 2, CoO, NiO, ZnO, Cu 2 0, CuO, Ce 2 0 3, the Ce0 2 , ln 2 0 3 , W0 3 , V 2 0 5 , alone or in mixture
- the semiconductor may optionally be doped with one or more elements chosen from metal elements, such as for example V elements.
- non-metallic elements such as for example C, N, S, F, P, or by a mixture of metallic and non-metallic elements.
- the porous monolith obtained according to the invention has a mesoporous volume, the pore diameter of which is between 0.2 and 50 nm, of between 0.05 and 1 ml / g, preferably between 0.1 and 0.5 ml. boy Wut.
- the porous monolith obtained according to the invention has a macroporous volume, whose pore diameter is greater than 50 nm and less than or equal to 5000 nm, preferably greater than 50 nm and less than or equal to 2000 nm, between 0.01 at 1 mL / g, preferably between 0.05 and 0.5 mL / g.
- the macroporous and mesoporous volumes are measured by mercury intrusion porosimetry according to ASTM D4284-83 at a maximum pressure of 4000 bar, using a surface tension of 484 dyne / cm and a contact angle of 140 °.
- group VIII according to the CAS classification corresponds to the metals of columns 8, 9 and 10 according to the new IUPAC classification.
- the invention relates to a process for the preparation of multimodal porosity monolith containing at least one inorganic semiconductor.
- the preparation process according to the invention uses polymer particles as porogenic agent.
- the preparation process uses a powder of one or more semiconductor precursors in their oxide form. More particularly, the preparation process according to the invention comprises the following steps: a) a first aqueous suspension containing polymer particles is prepared; b) preparing a second aqueous suspension containing particles of at least one inorganic semiconductor; c) mixing the two aqueous suspensions prepared in step a) and b) to obtain a paste; d) a heat treatment of the paste obtained in step c) is carried out to obtain the monolith with multimodal porosity.
- the steps of the preparation process are described in more detail below.
- Step a) (Preparation of the first aqueous suspension)
- a first aqueous suspension containing polymer particles is prepared.
- the polymer particles are mainly in the form of spheres of diameter between 0.1 and 5 ⁇ , preferably between 0.3 and 3 ⁇ .
- the particles can be composed of any polymer, preferably the particles are composed of polystyrene, optionally modified.
- the aqueous suspension contains polymer particles at 20 to 500 g / L.
- the aqueous suspension has a pH of between 1 and 10, preferably between 2 and 8.
- the polymer particles may be commercial or synthesized by any method known to those skilled in the art.
- the polymer particles are synthesized and are composed of polystyrene, it is possible to implement the following method: i) a solution of ethanol and polyvinylpyrrolidone (PVP) is prepared, which solution is degassed under a stream of nitrogen for at least an hour.
- the solution optionally contains water.
- the mass ratio of ethanol and PVP is between 50 and 200; ii) the solution is heated to a temperature of 50 to 90 ° C; iii) a reaction mixture of styrene and a polymerization initiator is prepared, which mixture is degassed under nitrogen for at least one hour.
- the mass ratio of styrene and initiator being between 30 and 300.
- the polymerization initiator is 2,2'azobis (2-methylpropionitrile) (AIBN); iv) the reaction mixture obtained in step iii) is added to the solution obtained in stage ii) at a temperature of between 50 and 90 ° C., with stirring.
- the reagent system is kept under agitation and at a temperature of between 50 to 90 ° C for 1 hour to 48 hours;
- the suspension obtained is washed at least twice, preferably at least three times, with water, preferably with distilled water, then vi) the polymer particles are recovered by filtration or centrifugation.
- Step b) preparation of the second aqueous suspension
- step b) of the process for preparing the porous monolith according to the invention preferably at room temperature, a second aqueous suspension containing particles of at least one inorganic semiconductor is prepared.
- said semiconductor is in the form of powder advantageously comprising particles of diameter between 5 and 200 nm, preferably between 10 and 100 nm.
- the inorganic semiconductor is in an oxide form.
- the semiconductor may be commercial or synthesized by any method known to those skilled in the art.
- the aqueous suspension has an acidic pH, preferably between 0 and 4. Any compound may be used as the acidic agent, preferably the acidic agent will be nitric acid or hydrochloric acid.
- Said aqueous suspension contains the semiconductor at a level of 200 to 900 g / l.
- said aqueous suspension may also contain in any proportion a metal alkoxide, preferably a titanium alkoxide, silicon or aluminum alone or in admixture.
- step c) of the process for preparing the porous monolith according to the invention preferably at room temperature, the two aqueous suspensions prepared in step a) and b) are mixed to obtain a paste.
- the two suspensions are mixed and poured into a mold of the desired shape for the final monolith.
- the mass ratio between the suspensions containing the polymer particles and containing the semiconductor particles is between 0.05 and 1, preferably between 0.1 and 0.7.
- Step d) (heat treatment)
- a heat treatment of the paste obtained in step c) is carried out to obtain the porous monolith, said heat treatment being carried out under air at a temperature between 300 and 1000 ° C for 1 to 72h.
- the heat treatment under air is carried out in several trays, a first tray made at a temperature of between 70 and 130 ° C. for 1 to 12 hours, and a second plate produced at a temperature of between 130 ° C. and 220 ° C. ° C for 1 to 12 hours, and a third plate made at a temperature between 250 and 700 ° C for 1 to 12 hours.
- the use of three temperature trays allows a progressivity of the heat treatment avoiding the formation of cracks on the material while ensuring a good mechanical strength of said material.
- the specific heat treatment of the preparation process according to the invention makes it possible to accurately control the final porosity of the monolith by combustion of the polymer particles, thereby releasing a porosity calibrated by the size of said particles.
- the monolith prepared according to the invention contains 10 to 100% by weight of inorganic semiconductor relative to the total weight of porous monolith, preferably from 20 to 100% by weight.
- the bandgap of inorganic semiconductors is generally between 0.1 and 4.0 eV.
- the semiconductor is a metal oxide.
- the metal of the inorganic semiconductor may be chosen from one or more elements of groups IB, MB, IVA, VA, VIA, IVB, VB, VIB, VIIIB or NIA.
- a semiconductor is selected from Fe 2 0 3, SnO, the Sn0 2, Ti0 2, CoO, NiO, ZnO, Cu 2 0, CuO, Ce 2 0 3, the Ce0 2 , ln 2 0 3 , W0 3 , V 2 0 5 , alone or in mixture
- the semiconductor may optionally be doped with one or more elements chosen from metal elements, such as for example V elements.
- the porous monolith obtained according to the invention has a mesoporous volume, the pore diameter of which is between 0.2 and 50 nm, of between 0.05 and 1 ml / g, preferably between 0.1 and 0.5 ml. boy Wut.
- the porous monolith obtained according to the invention has a macroporous volume, whose pore diameter is greater than 50 nm and less than or equal to 5000 nm, preferably greater than 50 nm and less than or equal to 2000 nm, between 0.01 at 1 mL / g, preferably between 0.05 and 0.5 mL / g.
- the multimodal porosity monolith prepared according to the invention can advantageously be used in photocatalysis for the production of dihydrogen by dissociation of water.
- the suspension obtained is poured into a petri dish 5 cm in diameter and 1 cm in height.
- Heat treatment is then carried out at 120 ° C for 1 h, then 180 ° C for 2 h, then 500 ° C for 3 h with a temperature rise slope of 0.1 ° C / min.
- TiO 2 -based monolith A is obtained with a pore population centered on 23 nm and a total pore volume of 0.38 ml / g.
- the suspension obtained is poured into a petri dish 5 cm in diameter and 1 cm in height.
- Heat treatment is then carried out at 120 ° C for 1 h, then 180 ° C for 2 h, then 500 ° C for 3 h with a temperature rise slope of 0.1 ° C / min.
- the contents of the flask are brought to 85 ° C, then the styrene / AIBN mixture is added to the syringe. Stirring and heating are maintained for 24 hours.
- the mixture is then washed three times by centrifugation with distilled water, finally a quantity of water is added to the polystyrene particles obtained to have a concentration of 165 g / L in the suspension.
- the average diameter of the spherical polystyrene particles is measured at 1850 nm.
- the suspension of TiO 2 is mixed with 2.5 g of the suspension of polystyrene particles, then the whole is poured into a petri dish of 5 cm in diameter and 1 cm in height.
- Heat treatment is then carried out at 120 ° C for 1 h, then 180 ° C for 2 h, then 500 ° C for 3 h with a temperature rise slope of 0.1 ° C / min.
- the mixture is then washed three times by centrifugation with distilled water, finally a quantity of water is added to the polystyrene particles obtained to have a concentration of 165 g / L in the suspension.
- the average diameter of the spherical polystyrene particles is measured at 640 nm.
- the suspension of TiO 2 is mixed with 8.47 g of the suspension of polystyrene particles, then the whole is poured into a petri dish 5 cm in diameter and 1 cm in height.
- Heat treatment is then carried out at 120 ° C for 1 h, then 180 ° C for 2 h, then 500 ° C for 3 h with a temperature rise slope of 0.1 ° C / min.
- a TiO 2 -based D-monolith was finally obtained with a pore population centered on 28 nm and a pore population centered on 280 nm and a mesoporous volume of 0.45 ml / g, a macroporous volume of 0.37.
- ml / g is a total pore volume of 0.82 ml / g.
- the contents of the flask are brought to 75 ° C, then the styrene / AIBN mixture is added to the syringe. Stirring and heating are maintained for 24 hours.
- the mixture is then washed three times by centrifugation with distilled water, finally a quantity of water is added to the polystyrene particles obtained to have a concentration of 165 g / L in the suspension.
- a quantity of water is added to the polystyrene particles obtained to have a concentration of 165 g / L in the suspension.
- the suspension of Ce0 2 is mixed with 8.52 g of the suspension of polystyrene particles, then the whole is poured into a petri dish of 5 cm in diameter and 1 cm in height.
- Heat treatment is then carried out at 120 ° C for 1 h, then 180 ° C for 2 h, then 500 ° C for 3 h with a temperature rise slope of 0.1 ° C / min.
- a Ce0 2 -based E-monolith was obtained with a pore population centered on 32 nm and a pore population centered on 290 nm and a mesoporous volume of 0.31 ml / g, a macroporous volume of 0.45 ml. g is a total pore volume of 0.76 ml / g.
- Example 6 Implementation of solids for the photocatalytic production of dihydrogen by dissociation of water in the gas phase
- the monoliths A, B, C, D and E are subjected to a photocatalytic production test of dihydrogen by dissociation of the water in the gas phase in a continuous reactor with a crossed bed of steel provided with a quartz optical window and sintered in front of the optical window on which the solid is deposited.
- the monoliths are placed on the sintered, their diameter being equal to the diameter of the reactor.
- the irradiated surface for all photocatalysts is 8,042477.10 ⁇ 04 m2.
- the tests are carried out at ambient temperature under atmospheric pressure.
- An argon flow rate of 3 ml / min passes through a water saturator before being dispensed into the reactor.
- the production of dihydrogen gas produced by the photocatalytic reduction of the water entrained in the saturator is monitored by an analysis of the effluent every 4 minutes by gas chromatography.
- the UV-Visible irradiation source is provided by an Xe-Hg lamp (Asahi TM, MAX302 TM).
- the irradiation power is always maintained at 80 W / m 2 for a range of wavelengths between 315 and 400 nm.
- the duration of the test is 20 hours.
- the activity values show that the solids prepared according to the invention systematically have the best performance when used in photocatalytic production of dihydrogen by dissociation of water.
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Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1753759A FR3065651B1 (fr) | 2017-04-28 | 2017-04-28 | Procede de preparation d'un monolithe a porosite multimodale |
| PCT/EP2018/060379 WO2018197434A1 (fr) | 2017-04-28 | 2018-04-23 | Procede de preparation d'un monolithe a porosite multimodale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3615203A1 true EP3615203A1 (fr) | 2020-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18724474.4A Withdrawn EP3615203A1 (fr) | 2017-04-28 | 2018-04-23 | Procede de preparation d'un monolithe a porosite multimodale |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US11247193B2 (fr) |
| EP (1) | EP3615203A1 (fr) |
| JP (1) | JP7223708B2 (fr) |
| CN (1) | CN110769929A (fr) |
| AU (1) | AU2018258984B2 (fr) |
| FR (1) | FR3065651B1 (fr) |
| WO (1) | WO2018197434A1 (fr) |
Family Cites Families (22)
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| GB2199541A (en) * | 1986-10-16 | 1988-07-13 | Rig Design Services | Production of engineering drawings |
| DE19533486A1 (de) * | 1995-09-12 | 1997-03-13 | Basf Ag | Monomodale und polymodale Katalysatorträger und Katalysatoren mit engen Porengrößenverteilungen und deren Herstellverfahren |
| WO2003003015A2 (fr) * | 2001-06-28 | 2003-01-09 | Advanced Research And Technology Institute, Inc. | Procedes de preparation de billes marquees par des points quantiques multicolores et conjugues de ces billes |
| EP1446356A4 (fr) * | 2001-11-21 | 2005-04-06 | Univ Massachusetts | Materiaux mesoporeux et procedes de fabrication |
| KR100764337B1 (ko) | 2002-02-19 | 2007-10-05 | 가부시끼가이샤 케미컬 오토 | 디젤 배기 가스의 정화 필터 |
| CN101646402A (zh) * | 2007-01-19 | 2010-02-10 | 金文申有限公司 | 用粉末模塑法制成的多孔、不可降解植入物 |
| CN101855011B (zh) * | 2007-05-31 | 2015-07-22 | 开利公司 | 抗失活光催化剂及制备方法 |
| JP4939319B2 (ja) * | 2007-06-29 | 2012-05-23 | 信越石英株式会社 | 多孔質光触媒体の製造方法及び多孔質光触媒体並びに浄化装置 |
| US9150422B2 (en) * | 2009-03-12 | 2015-10-06 | Mitsui Chemicals, Inc. | Porous metal oxide, method for producing the same, and use of the same |
| WO2011033377A2 (fr) * | 2009-09-17 | 2011-03-24 | Vive Nano, Inc. | Nanocomposites multifonctionnels |
| FR2975309A1 (fr) * | 2011-05-19 | 2012-11-23 | Centre Nat Rech Scient | Monolithe macrocellulaire de dioxyde de titane, procede de preparation, utilisation a titre de photocatalyseur et procede de decontamination |
| GB2509690B (en) * | 2012-10-09 | 2020-12-09 | Ip2Ipo Innovations Ltd | Ceramic material |
| WO2014210608A1 (fr) * | 2013-06-28 | 2014-12-31 | President And Fellows Of Harvard College | Structures à surface étendue recouvertes d'un matériau fonctionnel |
| FR3016813B1 (fr) | 2014-01-27 | 2017-11-24 | Total Sa | Materiau a base de ti02 absorbant dans le visible et procede pour sa fabrication |
| CN104910311B (zh) * | 2015-05-22 | 2017-09-29 | 南京工业大学 | 一种大粒径中空聚合物微粒子及其制备方法 |
| CN108367272B (zh) | 2015-07-14 | 2021-11-23 | 英国石油有限公司 | 包含季铵化合物和/或使用季铵化合物制备的挤出的二氧化钛基材料 |
| US10675610B2 (en) | 2015-07-14 | 2020-06-09 | Bp P.L.C. | Extruded titania-based materials comprising one or more acids or prepared using one or more acids |
| EP3322530B1 (fr) * | 2015-07-14 | 2024-10-30 | Bp P.L.C. | Catalyseur de synthèse fischer-tropsch comprenant un matériau poreux à base de dioxyde de titane extrudé comportant des mésopores et des macropores, sa préparation et un procédé fischer-tropsch en présence du catalyseur de synthèse fischer-tropsch |
| CN105304886B (zh) * | 2015-09-23 | 2018-05-11 | 东莞市迈科科技有限公司 | 一种秩序大孔二氧化钛及其制备方法 |
| CN105664935B (zh) * | 2015-12-31 | 2018-02-13 | 北京化工大学 | 一种三维有序介孔Au‑TiO2/IO‑SiO2薄膜可见光光催化剂及制备方法 |
| GB201706805D0 (en) * | 2017-04-28 | 2017-06-14 | Cambridge Entpr Ltd | Composite metal organic framework materials, processes for their manufacture and uses thereof |
| FR3065650B1 (fr) * | 2017-04-28 | 2019-06-28 | IFP Energies Nouvelles | Procede de reduction photocatalytique du dioxyde de carbone mettant en œuvre un photocatalyseur sous forme de monolithe poreux |
-
2017
- 2017-04-28 FR FR1753759A patent/FR3065651B1/fr not_active Expired - Fee Related
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2018
- 2018-04-23 EP EP18724474.4A patent/EP3615203A1/fr not_active Withdrawn
- 2018-04-23 JP JP2019557561A patent/JP7223708B2/ja active Active
- 2018-04-23 WO PCT/EP2018/060379 patent/WO2018197434A1/fr not_active Ceased
- 2018-04-23 CN CN201880027969.4A patent/CN110769929A/zh active Pending
- 2018-04-23 US US16/608,342 patent/US11247193B2/en not_active Expired - Fee Related
- 2018-04-23 AU AU2018258984A patent/AU2018258984B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020517440A (ja) | 2020-06-18 |
| US11247193B2 (en) | 2022-02-15 |
| AU2018258984B2 (en) | 2023-02-16 |
| AU2018258984A1 (en) | 2019-10-17 |
| JP7223708B2 (ja) | 2023-02-16 |
| FR3065651B1 (fr) | 2020-05-29 |
| CN110769929A (zh) | 2020-02-07 |
| WO2018197434A1 (fr) | 2018-11-01 |
| FR3065651A1 (fr) | 2018-11-02 |
| US20210101134A1 (en) | 2021-04-08 |
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