Microporous acidic oxide with catalytic properties itq-18

Details Microporous acidic oxide with catalytic properties itq-18 Microporous acidic oxide with catalytic properties itq-18

C - Chemistry, Metallurgy

01

B

C01B 39/48 (2006.01) B01J 29/04 (2006.01) B01J 29/70 (2006.01) C01B 33/38 (2006.01)

Patent

CA 2379332

The invention relates to a microporous crystalline material with a characteristic X-ray diffractogram, comprised of tetrahedra of oxygen and a metal (T+4 and T+3) with possibility of introducing superficial acidity produced by substitution in the network of certain cations T+4 (normally Si+4) by cations T+3 (normally Al+3), thereby causing a deficiency in the structural charge which can be compensated by protons, Brönsted acidity, and/or cations with high charge-radius ratio, Lewis acidity. The preparation method is based on the modification of the laminar structure of a mixed oxide (normally SiO2, Al2O3) which is synthesized from a gel having been treated in controlled hydrothermal conditions and intercalating between its sheets organic molecules which have a proton acceptor group and a long hydrocarbon chain. The sheets of the intercalated material are quite separated between each other due to the presence of organic chains between the sheets. The swollen material is then treated in order to separate and disperse the sheets. The final washing and subsequent calcination result in a microporous material with large external surface.

L'invention concerne un matériau cristallin microporeux, présentant un diffractogramme de rayons x caractéristique, se composant de tétraèdres d'oxygène et d'un métal (T?+4¿ et T?+3¿) avec possibilité d'introduire une acidité superficielle produite par le remplacement dans le réseau de certains cations T?+4¿ (normalement Si?+4¿) par des cations T?+3¿ (normalement Al?+3¿), ce qui entraîne une déficience de charge structurale qui peut être compensée par des protons, (acidité Brönsted) et/ou des cations à fort rapport charge-rayon (acidité Lewis). Ce procédé de préparation utilise la modification de la structure lamellaire d'un oxyde mixte (normalement SiO¿2?, Al¿2?O¿3?) synthétisé à partir d'un gel traité dans des conditions hydrothermiques régulées et permet de disposer, entre les feuilles, des molécules organiques possédant un groupe accepteur de protons et une vaste chaîne hydrocarbonée. Le matériau intercalé présente des feuilles nettement séparées en raison de la présence de chaînes organiques. Le matériau gonflé est ensuite traité pour séparer et disperser les feuilles. Le lavage final et la calcination ultérieure permettent d'obtenir un matériau microporeux avec une grande surface externe.

Affiliated with

Also associated with

Rating

Microporous acidic oxide with catalytic properties itq-18 does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microporous acidic oxide with catalytic properties itq-18, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microporous acidic oxide with catalytic properties itq-18 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1675777