| 简介 |
FIELD : technological processes.
SUBSTANCE : invention relates to porous inorganic composite oxide intended for use as substrate material for catalyst, which includes aluminium and cerium oxides, or aluminium and zirconium oxides, or aluminium, cerium and zirconium oxides and optionally one or more doping elements oxides selected from transition metals, rare-earth metals and their mixtures, wherein said inorganic composite oxide has : (a) specific surface area after calcination at 1, 100 °C for 5 hours, more or equal to area, calculated according to equation SA=0.8235[Al]+11.157, in which : SA represents specific surface area of inorganic composite oxide according to BET, in square meters per g, and [Al] is a number of aluminium oxides in composite oxide, expressed in form of weight ratio of Al2O3 to 100 weight fractions of composite oxide, and (b) is total volume of pores after annealing at 900 °C for 2 hours, greater than or equal to volume calculated according to equation PV=0.0097[Al]+0.0647 where PV represents inorganic composite oxide pores volume in cubic centimeters per g, wherein composite oxide involves, in each case in amount, which is expressed in form of separate binary oxide of corresponding element on 100 weight fractions of composite oxide : (a) approximately from 20 to 98 wt of Al2O3, and (b) (i) approximately from 2 to 80 wt of ZrO2, or (b) (ii) approximately from 2 to 80 wt of CeO2, or (b) (iii) approximately from 2 to less than 78 wt of ZrO2 and from 2 to 78 mass fractions of CeO2 provided that, combined amount of ZrO2 and CeO2 does not exceed 80 weight fractions, and (c) optionally up to approximately 15 weight fractions of one or more doping elements oxides selected from transition metals, rare-earth metals and their mixtures. Invention also relates to method of porous inorganic composite oxide producing, as well as to internal combustion engine exhaust gases catalyst.
EFFECT : technical result consists in production of thermally stable porous inorganic composite oxide with increased volume of pores.
19 cl, 16 dwg, 1 tbl, 20 ex |
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