III International Conference

PP-II-58The analysis of the raw materials influence on the pastes (fresh) Rheological propertieshas shown, that the Elasticity Coefficient Е 1 , the Elasticity module Е 2 and viscosity ή stronglydepend on the raw materials. Thus, the Elasticity module Е 2 obtained for the fresh plasticpastes prepared with PBP are is ~ 5 times higher than that for pastes prepared with PBTA.The Elasticity Coefficient Е 1 has weaker sensitivity to binder than to iron oxide and is higherfor pastes prepared with iron oxide No 2 as compared with iron oxide No 1. After dailystorage no strong change in E 1 and E 2 values was detected for pastes with PBP, whileelasticity coefficient E 1 decreased and elasticity module E 2 increased (but values stays in3-4 time lower than that obtained in the case of PBP) for pastes with PBTA, thus revealing thechange in pastes Rheological properties during storage especially strong for paste iron oxideNo2-PBTA. The paste viscosity increases after storage up to 10 times, and it is lower in thecase of PBP. The most significant (tenfold) growth of viscosity after storage was detected forpaste prepared with iron oxide No 2 and PBTA as a binder. This viscosity parameter is thegreatest.All as prepared pastes can be molded as honeycombs. Taking into account that moldingof fresh pastes for BIC 42-1 preparation usually results in cracks formation while molding ofpastes after storage allows preparing of monoliths without cracks especially in the case ofPBTA, one can make a conclusion about correlation between paste Rheological properties(coefficients) and possibility of preparation of monoliths without cracks. Obviously, highvalue of viscosity is very important and E 1 should not be of high value (lower then 50%).Probably such Rheological properties are of importance for catalyst granules strength as well[2].Hence, for BIC-42-1 honeycomb catalyst preparation (not only for molding, but forobtaining strong honeycombs without cracks) the highest value of viscosity ή is veryimportant. The best mechanical properties were observed for the catalyst prepared from ironoxide No2 and PBTA based paste after its daily storage [2] with Rheological characteristics:elasticity coefficient E 1 =21,5%, elasticity module Е 2 =12,5%, viscosity ή =66%.References1. Sadykov V.A., Isupova L. A., Zolotarskii I. A., Bobrova L. N., Noskov A. S., Parmon V. N.,Brushtein E. A., Telyatnikova T. V., Chernyshev V. I., Lunin V. V.//Appl. Catal. A: General.2000. V. 204. P. 59.2. Kruglyakov V.Yu., Isupova L.A., Kulikovskaya N.A., et al.//Catalysis in Industry (accepted,2007, No 2)269