| 摘要 |
<p>Problems on catalyst production and catalyst performance with respect to conventional crystalline silicoaluminophosphate salt molecular sieve having octaoxygen-membered ring pores as a non-equivalent methylamine synthesis catalyst are resolved. Schapbachite type crystalline silicoaluminophosphate salt molecular sieve of high purity and high crystallinity having an amorphous oxide layer whose Si/Al atomic ratio is greater than that of the crystal grain whole body on a crystal grain surface can be stably produced with high yield with the use of a small amount of molding agent by a process characterized in that the hydrothermal treatment in the production of crystalline silicoaluminophosphate salt molecular sieve having octaoxygen-membered ring pores is controlled under specified treating conditions. The thickness and composition of amorphous oxide layer, which exert marked influence on the yield of dimethylamine synthesis, can be easily controlled and reproduced under the conditions of catalyst synthesis according to the invention. Thus, the catalyst of high performance can be stably supplied by the process of low cost capable of reducing the output of waste.</p> |
