| abstract |
The invention discloses a method for preparing a catalyst containing modified SAPO-34 molecular sieve, comprising the following steps: S01, firstly mixing an aluminum source with water uniformly, and then adding deionized water, phosphorus source, template I and silicon source in sequence , chromium salt and templating agent two, stir and mix at 20~30 ° C for 1~2 hours to obtain a mixed reaction solution; the aluminum source, phosphorus source, silicon source, chromium salt, templating agent one, templating agent two and water The molar ratio is (0.7~1.5):(0.7~1.5):(0.1~0.4):(0.1~0.4):(0.5~2.5):(0.5~2.5):(50~70). The invention also discloses the application of the preparation method of the catalyst containing the modified SAPO-34 molecular sieve in the MTO reaction. The invention can reduce the carbon deposition of the catalyst, improve the diffusion performance of the catalyst, and improve the diene selectivity. |