| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to method of preparing silicoaluminophosphate (SAPO) molecular sieves, to containing them catalysts, and to methods of catalytic dehydration with application of said catalysts. Described is method of preparing SARO molecular sieve, preferably, possessing crystalline structure SAPO-34, including the following stages: mixing source P with source Al obtaining mixture, addition to said first source Si and template obtaining suspension or slime to value in the interval from 5 to 6.8, hydrothermal processing of said suspension or slime obtaining suspension of SAPO molecular sieve, isolation from suspension of said SAPO molecular sieve and its drying, and before addition of said source Si and said template said mixture of sources P and Al is boiled with stirring, said stage of boiling is carried out at temperature in the interval from 50 to 100°C, preferably at 75°C, during period of time from 10 to 30 h, preferably 24 h. Described is SAPO molecular sieve, preferably, possessing crystalline structure SAPO-34, which can be prepared in accordance with described method and is characterised by the following chemical composition: (SiAlP)O, where x, y and z stand for mole fractions of respectively Si, Al and P, and x stands for mole fraction of Si and has value in the interval from 0.001 to 0.1, y stands for mole fraction of Al and has value within the interval from 0.25 to 0.5, z stands for mole fraction of P within the interval from 0.4 to 0.8. Described is catalyst, including SAPO molecular sieve and matrix material, selected from group, including aluminium oxide, silicon dioxide, aluminium silicate, silicon dioxide- aluminium oxide and natural kaolin, preferably, activated aluminium oxide, contains at least 50 wt % of pseudoboehmite. Described are method of converting methanol into dimethyl ether (DME), method of converting methanol into olefins in presence of described above catalyst.EFFECT: obtaining very pure highly crystalline SAPO molecular sieves, possessing exceptional activity in dehydration reactions, with very high output.16 cl, 4 tbl, 9 ex, 7 dwg |
