Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

PP-62CERAMIC MEMBRANES IN THE PROCESSES OF VAPORCONVERSION OF ETHANOL AND ACETIC ACID AS THE MAINPRODUCTS OF BIOMASS FERMENTATIONUvarov V.I., Borovinskaya I.P., Malevannaya I.G.Institute of Structural Macrokinetics and Materials Science RAS, Chernogolovka,Moscow region, 142432 Russia. E-mail: uvar@ism.ac.ruThe paper is dedicated to obtaining high-temperature, corrosion-resistant,mechanically strong nano-porous structures by self-propagating high-temperaturesynthesis and producing efficient membranes based on the structures for vaporconversion of ethanol and acetic acid as the main products of biomass fermentation.At first the «gas-kinetic model» of porous structure formation during SHS wasconsidered and Laplace’s equation was used for determining the pore size. Themetal melts in the combustion wave and spreads with a liquid layer formation. If inthis case the pressure of the liquid vapor and impuritive gases in the liquid is higherthan the external pressure, the open porosity of the final product (membrane) isformed at fast cooling.The conditions of the open and closed porosity formation were defined; the zoneof conversion of the closed porosity of the synthesized material to its open value wasalso found. It allows controlling the structure and pore size in the obtained gradednano-porous SHS materials, i.e. membranes.Using the «gas-kinetic model», we developed the modes for synthesizingcatalytically active high-porous ceramic carriers of membrane-catalytic systemsbased on refractory inorganic compounds Ni-Al-Co; Ni-Al-Co/NiO, Ni-Al-Mn, Ni-Al-Ti,Ni-Al/NiO with the following characteristics:Open porosity, % 40 – 58Pore size, μm 10 – 0.01Bending strength, MPa 50 – 60Specific surface, m 2 /g 3 – 10The structure of the samples was studied with an electronic microscope, thestructural analysis was carried out using an X-ray microanalyser. A membranecatalyticmodule with gas consumption of up to 25 m 3 /h was made.The catalytic layer of metal oxides was formed inside the membrane channels bythe sol-gel method using organic solutions of metal-complex precursors in toluene153