Details

Autor(en) / Beteiligte

• Alié, C.
• Ferauche, F.
• Tcherkassova, N.
• Pirard, R.
• Lambert, S.
• Winterton, N.
• Pirard, J.-P.
• Heinrichs, B.

Titel

Large-scale synthesis and forming of xerogel catalysts

Ist Teil von

• Scientific Bases for the Preparation of Heterogeneous Catalysts, 2006, Vol.162, p.729-736

Ort / Verlag

The Netherlands: Elsevier Science & Technology

Erscheinungsjahr

2006

Link zum Volltext

Beschreibungen/Notizen

• This chapter investigates how the co-gelation synthesis could be up-scaled to expand applications in catalysis. The method used to extrapolate the synthesis of Pd–Ag/SiO2 xerogel catalysts with tailored morphology to semi-industrial scale. The scaling up was carried out on silica xerogels, particularly on the materials based on the 3-(2-aminoethylamino)propyltrimethoxysilane–tetraethyl orthosilicate (EDAS–TEOS) couple as this is used for catalyst synthesis. The influence of the replacement of laboratory-grade reagents by industrial-grade reagents was investigated and the synthesis procedure was up-scaled from the one-gram scale to the hundred-gram scale. The synthesis of Pd–Ag/SiO2 xerogel catalysts was simplified and industrial grade reagents were employed. As the catalyst powder cannot be used in an industrial fixed-bed reactor, it must be converted to a form that maintains catalyst active sites accessible for reactants, minimizes the pressure drop in the catalytic bed, and improves the mechanical resistance of the catalyst pellets. Three such forming processes are considered: extrusion, impregnation on alumina foams, and production of microspheres using the BRACE process. The catalytic and morphological properties of the different materials obtained at the different levels were compared to the reference material.