Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

PP-54PREPARATION OF ADVANCED ADSORBENTS AND CATALYSTSUPPORTS BY PROCESSING OF RICE HUSKShikina N.V. 1 , Ismagilov Z.R. 1 , Andrievskaya I.P. 1 , Rudina N.A. 1 ,Mansurov Z.A. 2 , Biisenbaev M.A. 2 , Zhandosov Zh.M. 21 Boreskov Institute of Catalysis SB RAS, 630090, Novosibirsk, Russia,5, Pr. Akad. Lavrentieva, zri@catalysis.ru2 Al-Faraby Kazakh National University, 050038, Almaty, Kazakhstan,71, al-Faraby av.Rice husk (RH) is a valuable secondary material obtained during production ofcommodity rice. As much as 550 million tons of rice husk are accumulated annuallyin rice-producing countries. RH is characterized by high concentration of ashes (morethan 20%) consisting mostly of amorphous SiO 2 . Meanwhile, RH is a lignocellulosebiomass that can be used as a precursor for synthesis of carbon materiasl withdeveloped porous structure by special processing. The RH processing includescarbonization followed by physical (CO 2 , water vapor) or chemical (KOH, NaOH,K 2 CO 3 , ZnCl 2 , etc.) activation of the carbonized rice husk (CRH) at 650°C or highertemperature. The CRH activation yields microporous carbon materials with highspecific surface area and pore volume. However, it is necessary to developmesoporous structure and lift steric limitations to use them for adsorption of heavymetals, radioactive nuclides, and organic pollutants or as catalyst supports.We developed a SiO 2 leaching method for the predominant formation ofmesopores necessary for the catalyst supports or adsorbents. We studied RHcarbonization in the Ar atmosphere, developed a CRH leaching method,demonstrated the formation of honeycomb monoliths from CRH and applicability ofthe SiO 2 leaching method for the formed monoliths. The mesoporous CRH andcarbon monoliths were studied at all the synthesis stages by a complex ofphysicochemical methods: BET, SEM, XRD, AAS and determination of themechanical strength. The developed method makes it possible to remove 90-95% ofSiO 2 from the material matrix, increasing S BET from 167 to 400 m 2 /g and V Σ from 0.1to 0.4 cm 3 /g, and yielding a material with the fraction of mesopores (D pore =30-100 nm) about 85-90%. The prepared monoliths are characterized by S BET exceeding300 m 2 /g, V Σ = 0.3 cm 3 /g and high mechanical strength. In the presentation we shalldemonstrate examples of the tests and application of the synthesized materials.144