Co-Zn-Al Hydrotalcite (HTlc) based samples were investigated as catalysts in the well-known Fischer–Tropsch synthesis (FTS). Ternary HTlc in nitrate form having formula [Zn1-xyCoxAly( OH)2](NO3)y.mH2O with x=0.15-0.70 were prepared with the urea method  in order to obtain precursors of catalysts active for the FTS. The thermal activation of the precursors at 350°C gives rise to finely dispersed metallic Co on mixed oxides which essentially retain the lamellar morphology of the precursors. An optimization study concerning the amount of cobalt (range 15-70 %atomic) and the reaction temperature (range 220-260°C) of the prepared catalysts is reported. All the samples have been fully characterized (BET, ICP/OES, XRD, TG-DTA, FT-IR, SEM and TEM) and tested in a laboratory plant. FTS tests have been carried out in a fixed bed tubular reactor, using 1 g of fresh catalyst mixed with 1 g of diluting material (α-Al2O3, Fluka) . The catalysts were previously activated at appropriate conditions, and the test was conducted in a continuousflow unit in the following conditions: CO:H2 = 1:2 (molar), 90 h, pressure 2 MPa, reaction temperature in the range 220-260°C. The main catalytic results are displayed in Table 1. CO conversion and process selectivity towards light and heavy hydrocarbons are not always closely related to the cobalt amount in the catalysts. The obtained data suggest the possibility of using synthetic HTlc as a suitable Co-based catalysts for FTS and open the expectation for a subsequent study of synthetic hydrotalcite as a suitable support for Co for FTS.
Synthetic hydrotalcites as suitable Co-based catalysts for Fischer-Tropsch process / A. Di Fronzo, C. Pirola, D.C. Boffito, C.L.M. Bianchi, A. DiMichele, R. Vivani, M. Nocchetti, M. Bastianini. ((Intervento presentato al 18. convegno Congresso nazionale della divisione di chimica industriale tenutosi a Firenze nel 2012.
|Titolo:||Synthetic hydrotalcites as suitable Co-based catalysts for Fischer-Tropsch process|
DI FRONZO, ANTONIETA (Primo)
PIROLA, CARLO (Secondo)
|Data di pubblicazione:||giu-2012|
|Parole Chiave:||Fischer Tropsch ; Hidrotalcites ; Cobalt biosyngas|
|Settore Scientifico Disciplinare:||Settore ING-IND/25 - Impianti Chimici|
Settore CHIM/04 - Chimica Industriale
|Enti collegati al convegno:||Società Chimica Italiana|
|Citazione:||Synthetic hydrotalcites as suitable Co-based catalysts for Fischer-Tropsch process / A. Di Fronzo, C. Pirola, D.C. Boffito, C.L.M. Bianchi, A. DiMichele, R. Vivani, M. Nocchetti, M. Bastianini. ((Intervento presentato al 18. convegno Congresso nazionale della divisione di chimica industriale tenutosi a Firenze nel 2012.|
|Appare nelle tipologie:||14 - Intervento a convegno non pubblicato|