ZA200708050B - Mesostructured material with high aluminum content - Google Patents

Mesostructured material with high aluminum content

Info

Publication number
ZA200708050B
ZA200708050B ZA200708050A ZA200708050A ZA200708050B ZA 200708050 B ZA200708050 B ZA 200708050B ZA 200708050 A ZA200708050 A ZA 200708050A ZA 200708050 A ZA200708050 A ZA 200708050A ZA 200708050 B ZA200708050 B ZA 200708050B
Authority
ZA
South Africa
Prior art keywords
aluminum content
high aluminum
mesostructured material
mesostructured
content
Prior art date
Application number
ZA200708050A
Other languages
English (en)
Inventor
Chaumonnot Alexandra
Coupe Aurelie
Sanchez Clement
Euzen Patrick
Boissiere Cedric
Grosso David
Original Assignee
Inst Francais Du Petrole
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Inst Francais Du Petrole filed Critical Inst Francais Du Petrole
Publication of ZA200708050B publication Critical patent/ZA200708050B/xx

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B39/00Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
    • C01B39/04Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof using at least one organic template directing agent, e.g. an ionic quaternary ammonium compound or an aminated compound
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/06Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B01J20/08Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/16Alumino-silicates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/16Alumino-silicates
    • B01J20/18Synthetic zeolitic molecular sieves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28004Sorbent size or size distribution, e.g. particle size
    • B01J20/28007Sorbent size or size distribution, e.g. particle size with size in the range 1-100 nanometers, e.g. nanosized particles, nanofibers, nanotubes, nanowires or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28054Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J20/28078Pore diameter
    • B01J20/28083Pore diameter being in the range 2-50 nm, i.e. mesopores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00Catalysts comprising molecular sieves
    • B01J29/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/041Mesoporous materials having base exchange properties, e.g. Si/Al-MCM-41
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00Catalysts comprising molecular sieves
    • B01J29/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/80Mixtures of different zeolites
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00Nanotechnology for materials or surface science, e.g. nanocomposites
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B39/00Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
    • C01B39/02Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
    • C01B39/46Other types characterised by their X-ray diffraction pattern and their defined composition
    • C01B39/48Other types characterised by their X-ray diffraction pattern and their defined composition using at least one organic template directing agent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/60Synthesis on support
    • B01J2229/62Synthesis on support in or on other molecular sieves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00Catalysts comprising molecular sieves
    • B01J29/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/08Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00Catalysts comprising molecular sieves
    • B01J29/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/40Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00Catalysts comprising molecular sieves
    • B01J29/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/60Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the type L, as exemplified by patent document US3216789
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00Catalysts comprising molecular sieves
    • B01J29/04Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/7007Zeolite Beta

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Nanotechnology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Composite Materials (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
ZA200708050A 2005-06-02 2007-09-19 Mesostructured material with high aluminum content ZA200708050B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0505678A FR2886637B1 (fr) 2005-06-02 2005-06-02 Materiau mesostructure a forte teneur en aluminium

Publications (1)

Publication Number Publication Date
ZA200708050B true ZA200708050B (en) 2009-01-28

Family

ID=36129087

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA200708050A ZA200708050B (en) 2005-06-02 2007-09-19 Mesostructured material with high aluminum content

Country Status (8)

Country Link
US (1) US7807598B2 (xx)
EP (1) EP1910226B1 (xx)
JP (1) JP5150485B2 (xx)
CN (1) CN101189187B (xx)
DE (1) DE602006008312D1 (xx)
FR (1) FR2886637B1 (xx)
WO (1) WO2006128989A1 (xx)
ZA (1) ZA200708050B (xx)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2886636B1 (fr) * 2005-06-02 2007-08-03 Inst Francais Du Petrole Materiau inorganique presentant des nanoparticules metalliques piegees dans une matrice mesostructuree
FR2920756B1 (fr) * 2007-09-07 2010-08-20 Inst Francais Du Petrole Materiau amorphe comprenant du silicium a porosite hierarchisee et organisee
FR2920757B1 (fr) * 2007-09-07 2009-11-13 Inst Francais Du Petrole Materiau cristallise comprenant du silicium a porosite hierarchisee et organisee
FR2929264B1 (fr) * 2008-03-31 2010-03-19 Inst Francais Du Petrole Materiau inorganique forme de particules spheriques de taille specifique et presentant des nanoparticules metalliques piegees dans une matrice mesostructuree
FR2929266B1 (fr) * 2008-03-31 2010-03-19 Inst Francais Du Petrole Materiau mesostructure a forte teneur en aluminium et constitue de particules spheriques de taille specifique
FR2929265B1 (fr) * 2008-03-31 2016-04-15 Inst Francais Du Petrole Materiau aluminosilicate mesostructure forme de particules spheriques de taille specifique
FR2931708B1 (fr) * 2008-05-28 2014-03-14 Inst Francais Du Petrole Catalyseur a base d'un materiau cristallise a porosite hierarchisee et organisee et son utilisation en oligomerisation des olefines legeres
FR2931834B1 (fr) * 2008-05-28 2010-07-30 Inst Francais Du Petrole Procede de production de distillats moyens par hydrocraquage de charges issues du procede fischer-tropsch avec un catalyseur a base d'un materiau cristallise
FR2931705B1 (fr) * 2008-05-28 2010-09-03 Inst Francais Du Petrole Catalyseur a base d'un materiau amorphe comprenant du silicium a porosite hierarchisee et organisee et procede ameliore de traitement de charges hydrocarbonees
FR2931706B1 (fr) * 2008-05-28 2010-12-24 Inst Francais Du Petrole Catalyseur a base d'un materiau cristallise comprenant du silicium a porosite hierarchisee et organisee et procede ameliore de traitement de charges hydrocarbonees
FR2931833B1 (fr) * 2008-05-28 2011-06-10 Inst Francais Du Petrole Procede de production de distillats moyens par hydrocraquage de charges issues du procede fischer-tropsch avec un catalyseur a base d'un materiau amorphe
FR2931818B1 (fr) * 2008-05-28 2012-11-30 Inst Francais Du Petrole Procede d'oligomerisation des olefines legeres utilisant un catalyseur a base d'un materiau amorphe a porosite hierarchisee et organisee
FR2933088B1 (fr) * 2008-06-27 2010-08-20 Inst Francais Du Petrole Procede de preparation d'une alumine a mesoporosite controlee
FR2969511B1 (fr) * 2010-12-22 2012-12-28 IFP Energies Nouvelles Materiau spherique comprenant des nanoparticules metalliques piegees dans une matrice oxyde mesostructuree et son utilisation comme catalyseur dans les procedes du raffinage
FR2969513B1 (fr) 2010-12-22 2013-04-12 IFP Energies Nouvelles Procede de preparation d'un materiau spherique a porosite hierarchisee comprenant des particules metalliques piegees dans une matrice mesostructuree
US8852326B2 (en) 2011-03-07 2014-10-07 Exxonmobil Research And Engineering Company Aggregates of small particles of synthetic faujasite zeolite
US8882993B2 (en) 2011-03-07 2014-11-11 Exxonmobil Research And Engineering Company Stabilized aggregates of small crystallites of zeolite Y
US8778824B2 (en) 2011-03-07 2014-07-15 Exxonmobil Research And Engineering Company Aggregates of small crystallites of zeolite Y
US8778171B2 (en) 2011-07-27 2014-07-15 Exxonmobil Research And Engineering Company Hydrocracking catalysts containing stabilized aggregates of small crystallites of zeolite Y associated hydrocarbon conversion processes

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217240A (en) * 1976-09-02 1980-08-12 E. I. Du Pont De Nemours And Company Stable aluminosilicate aquasols having uniform size particles and their preparation
GB8613131D0 (en) * 1986-05-30 1986-07-02 Shell Int Research Hydrocarbon conversion
JPH075298B2 (ja) * 1986-07-07 1995-01-25 三菱化学株式会社 微小球状アルミナの製造法
FR2651767B1 (fr) * 1989-09-13 1991-11-08 Elf Aquitaine Procede de synthese de zeolithes a charpente aluminosilicate appartenant a la famille structurale de la faujasite, produits obtenus et leur application en absorption et catalyse.
JPH05105419A (ja) * 1991-05-24 1993-04-27 Chichibu Cement Co Ltd セラミツクス球状粉末の製造方法
US5622684A (en) * 1995-06-06 1997-04-22 Board Of Trustees Operating Michigan State University Porous inorganic oxide materials prepared by non-ionic surfactant templating route
JP2003531083A (ja) * 1997-12-09 2003-10-21 ザ・リージェンツ・オブ・ザ・ユニバーシティー・オブ・カリフォルニア メソ構造の無機酸化物材料のブロックポリマー処理方法
RU2248934C2 (ru) * 1999-09-07 2005-03-27 Технише Университет Дельфт Неорганические оксиды с мезопористостью или со смешанной мезо- и микропористостью и способ их получения
FR2800300B1 (fr) 1999-11-02 2002-12-20 Rhodia Chimie Sa Materiau mesostructure integrant des particules de dimension nanometrique
DE60003461T2 (de) * 1999-11-23 2004-05-06 UNIVERSITé LAVAL Mesoporöses zeolithisches material mit mikroporösen kristallinen mesoporenwänden
FR2802120B1 (fr) * 1999-12-14 2002-02-01 Inst Francais Du Petrole Solide silicoaluminate micro et mesoporeux, procede de preparation, utilisation comme catalyseur et en conversion d'hydrocarbures
FR2803223B1 (fr) * 1999-12-30 2002-06-21 Rhodia Chimie Sa Procede de preparation d'un materiau mesostructure a partir de particules de dimensions nanometriques
US6387453B1 (en) * 2000-03-02 2002-05-14 Sandia Corporation Method for making surfactant-templated thin films
US6843977B2 (en) * 2000-05-25 2005-01-18 Board Of Trustees Of Michigan State University Ultrastable porous aluminosilicate structures and compositions derived therefrom
FR2819432B1 (fr) * 2001-01-18 2003-04-11 Rhodia Chimie Sa Catalyseur mesostructure integrant des particules de dimensions nanometriques
JP2003342021A (ja) * 2002-05-28 2003-12-03 Polymatech Co Ltd 酸化アルミニウム粉末組成物及びそれを含有する熱伝導性成形体
US6886925B2 (en) * 2003-01-06 2005-05-03 Industrial Technology Research Institute Porous back-shooting inkjet print head module and method for manufacturing the same
JP4221498B2 (ja) * 2003-06-06 2009-02-12 独立行政法人産業技術総合研究所 多孔性アルミナ結晶性粒子及びその製造方法
FR2872152B1 (fr) * 2004-06-24 2006-08-11 Inst Francais Du Petrole Materiau a porosite hierarchisee comprenant du silicium
FR2872151B1 (fr) * 2004-06-24 2007-06-29 Inst Francais Du Petrole Materiau aluminosilicate mesostructure
JP2006069864A (ja) * 2004-09-03 2006-03-16 National Institute Of Advanced Industrial & Technology ナノポーラス体及びその製造方法
AU2006231725A1 (en) * 2005-04-05 2006-10-12 University College Cork - National University Of Ireland, Cork Mesoporous particles

Also Published As

Publication number Publication date
DE602006008312D1 (de) 2009-09-17
WO2006128989A1 (fr) 2006-12-07
CN101189187A (zh) 2008-05-28
FR2886637B1 (fr) 2007-08-03
US20090029847A1 (en) 2009-01-29
JP5150485B2 (ja) 2013-02-20
CN101189187B (zh) 2011-03-30
EP1910226A1 (fr) 2008-04-16
US7807598B2 (en) 2010-10-05
FR2886637A1 (fr) 2006-12-08
EP1910226B1 (fr) 2009-08-05
JP2008542178A (ja) 2008-11-27

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