Pillared Clays as Catalysts and Sorbents
New Catalysts and Sorbents on the Basis of Pillared Clays for the Processes of Hydrocarbons Conversion and Water Purification
Tech Area / Field
- CHE-IND/Industrial Chemistry and Chemical Process Engineering/Chemistry
8 Project completed
Senior Project Manager
Ryzhova T B
Institute of Organic Catalysis and Electrochemistry, Kazakstan, Almaty
- JSC «Kaustic», Kazakstan, Pavlodar reg., Pavlodar
- Universidad de Navarra, Spain, Pamplona
Project summaryThe purpose of the project: to develop methods of production of new materials with a high specific surface and advanced system pores of the given size for purification of waste water from toxic impurities and for processing of oil hydrocarbons (cracking and n-alkane isomerization) on the basis of clays from Kazakhstan deposits.
Kazakhstan has large resources of layered natural clay and the problem of their rational use is urgent. The Pavlodar kaoline clays deposit is one of largest in Kazakhstan and can be used as a basis for production of new perspective materials.
It is known that natural clays are widely used for different catalytic, processes. However, natural clay catalysts have low thermic stability in hydrogen or in multivalent cationic forms. Fixation of inter layer spaces in clays by oxides of transitional metals gives the possibility to produce new pillared materials with molecular sieves properties and its named pillared clays. Pillared clays has a great specific surface, thermal stability and high catalytic activity. Synthesis of pillared clays based on substitution of interlayer cations ordinarily Na + (sometimes Ca2+) by olygomeric hydroxycations formed at slowly hydrolysis of some salts. The fixation of Al and Zr olygomers into natural montmorillonite lead to the formation of thermal stable clays with molecular sieves and catalytic properties
Interlayer metallic-oxid clusters, called pillars, impede interlayer approximation and resulting bidimentional pores structure is received, in such structure, the distance between alumosilicate layers can reach up to 20 Ǻ. The formation of micropores is accompanited with dealumination of alumosilicate layers of pillared clays, which results in creation of macro and mesopores, that provides increase of a specific surface up to 400-500 м2. The increase in the number of macro- and mesopores in pillared clays permits to undergo processing of heavy hydrocarbons and substitution of more expensive zeolite containing catalysts.
The laboratory of catalyst processes of oil processing of IOCE invented methods of production of montmorillonite with pillared structure from Tagan deposit with the use aluminium chloride as a reagent, the production of which is produced at the Pavlodar chemical factory. The catalysts, produced on the basis of these materials, showed high activity and selectivity in the processes of conversion of oil hydrocarbons (cracking of vacuum gasoil and isomerization of oil n-alkanes with production of high octane isomers), surpassing the known industry used zeolite containing catalysts.
The project is an applied research.
Expected results of the project are:
- Development of technology of natural clay originating from different deposits with the ions of Al3+, Zr4+, Ti4+, Fe3+.
- Selection of effective composition of pillared clays for purification of waste water from harmful additions;
- Creation high selectivity compositions of catalysts for cracking of heavy oil fractions and for isomerization of oil alkanes with the purpose of production high octane motor fuel.
The realization of the project will proride the opportunity for "arms-producting" experts of the Pavlodar chemical plant to reorient the activities in research, and in applied fields to industrial synthesis.
At support ISTC we plan to develop methods of synthesis of pillared clays and their optimum structures, to study their physico-chemical properties and to create effective sorbents for purification of waste water on the basis of these clays, and also catalysts and carriers for metal catalysts of cracking and isomerization of oil n-alkanes.
Foreign collaborator will assist in granting necessary textual materials the participants of the project, in realization of joint working seminars, to participate in discussion of the technical reports.
Pillared clays of various structure on a basis of Pavlodar and Tagan bentonites will be investigated by XRD, EM, BET methods. Synthesized clay will be tested for purification of waste water and as catalysts of transformation of hydrocarbons raw material on “Caustik”.
The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.
ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.