Synthetic Hydrotalcites as suitable Co-based catalysts for Fischer-Tropsch
Process
C.L. Bianchi1*, C. Pirola1, A. Di Fronzo1, D.C. Boffito1, A. Di Michele2, R. Vivani3, M. Nocchetti3, M. Bastianini3
1 Università degli Studi di Milano, Dip. Chimica, Via Golgi, 19 – 20133 Milano (Italy) 2 Università degli Studi di Perugia, Dip. di Fisica, Via Elce di Sotto – 06123 Perugia
(Italy) 3 Università degli Studi di Perugia, Dip. di Chimica, Via Elce di Sotto – 06123 Perugia (Italy)
(*) [email protected]
1. Introduction
3. Results
The activated samples characterized by different cobalt loadings were tested
at different temperatures in the FT plant, as reported in the experimental part.
Catalytic tests resulted in a very satisfactory outcome, where the CO
conversion vs. the reaction temperature is reported for all the catalysts.
Ultra Clean Diesel
What is F.T?
•No sulphur compounds
•No aromatics
Structural HTLc
[1]
Cat traditional supp Co
FT synthesis usually requires
catalysts based on cobalt or iron.
Supported HTLc
In this work, layered double or
triple hydroxides, also known as
synthetic
hydrotalcites,
are
proposed and studied as FT
catalysts
1) All HTLc catalysts give higher CO conversion than traditional supported ones
2) The amount of Co in HTLc is the key parameter
3) Structural HTLc gives higher performance respect supported HTLc (Co15)
Essential target of FT synthesis
is to produce paraffins and
olefins and to limit at maximum
the formation of methane and
CO2.
2. Experimental
Catalysts Preparation
Testing Procedures
Products selectivity using catalysts with different Co
loadings at various temperatures.
[3]
[4]
Catalysts Characterization
4. Conclusions
[5]
SEM
Co15_n
Co35_n
TEM
Typical structure
of hydrotalcites:
homogeneous
aggregates of
hexagonal
platelets
• CO conversion and process selectivity towards light and
heavy hydrocarbons are not always closely related to the
cobalt amount in the catalysts.
• New interesting perspectives for the use of hydrotalcites as
catalysts for FT have been displayed.
• The presence of cobalt in the structure of the hydrotalcites
improves the results compared with cobalt supported on
Al2O3 and cobalt supported on HTLc
References
1. Q. Zhang, J. Kang, Y. Wang ChemCatChem 2010, 2, 1030 – 1058
2. F. Trifirò, A. Vaccari, F. Cavani, Catal. Today, 11, 173 (1991)
3. U. Costantino, F. Marmottini, M. Nocchetti, R. Vivani, Eur. J. Inorg. Chem., (1998) 1439.
4. C.L. Bianchi, C. Pirola, V. Ragaini, Cat. Comm., 7 (2006) 669.
5. C.L. Bianchi, C. Pirola, D.C. Boffito, A. Di Fronzo, A. Di Michele, R. Vivani, M. Nocchetti, M. Bastianini, S. Gatto, CatalysisInnovative Applications in Petrochemistry and Refining, DGMK Conference October 4-6, 2011, Dresden, Germany.