View Full Document

Study Notes



View the full content.
View Full Document
View Full Document

7 views

Unformatted text preview:

The Chemical Composition and Structure of Supported Sulfated Zirconia with Regulated Size Nanoparticles V V Kanazhevskiy1 V P Shmachkova2 N S Kotsarenko2 D I Kochubey2 and J C Vedrine3 1 Novosibirsk State University 2 Pirogova st 630090 Novosibirsk Russian Federation Boreskov Institute of Catalysis 5 Lavrentev av 630090 Novosibirsk Russian Federation 3 Laboratoire de Physico Chimie des Surfaces ENSCP 11 Rue P M Curie F 75005 Paris France 2 Abstract A set of model skeletal isomerization catalysts sulfated zirconia nanoparticles of controlled thickness anchored on different supports was prepared using colloidal solutions of Zr salt on titania as support The nanoparticles of zirconia 1 5 nm are epitaxially connected to the support surface with S Zr ratio equals to 1 3 1 5 It was shown by EXAFS that nanoparticles of non stoichiometric zirconium sulfate Zr SO4 1 x where x 0 5 are formed on the support surface Its structure looks like half period shifted counterdirected chains built up by zirconium atoms linked by triangle pyramids of sulfate groups Considering catalytic data of skeletal n butane isomerisation at 150oC one can suggest that these species behave as the active component of sulfated zirconia They are formed in subsurface layers as zirconium hydroxide undergoes sulfation followed by thermal treatment Keywords EXAFS skeletal isomerization catalysts sulfated zirconia supported on titania PACS 00 02 70Hm 30 32 30 r 60 61 10Ht INTRODUCTION The composition and structure of the active component of sulfated zirconia remains as yet unclear even though a huge number of studies have dealt with the problem 1 9 The bulk character of these catalysts is not allowing one to extract reliable data about the active sulfated zirconia surface with conventional bulk physical and chemical methods This problem may be solved by using a new type of sulfated zirconia catalysts namely sulfated zirconia nanoparticles of controlled thickness which can be anchored on different supports The



Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Study Notes and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Study Notes and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?