MSECT-4 molecular sieves with off and ERI topologies, preparation method therefor, and applications thereof

A method for preparing msect-4 molecular sieves with OFF and ERI topologies, wherein the msect-4 molecular sieves with OFF and ERI topologies are intergrown, and the msect-4 molecular sieves exhibit a regular bone-like morphology;

• the method comprises the following steps:
• dispersing an eight-membered ring small pore molecular sieve used as a raw material in an aqueous phase with stirring, adding caustic potash, adjusting pH to be greater than 10, adding an Organic Structure-Directing Agent (OSDA), and adding a silicon source to adjust a silicon-aluminum ratio, followed by shear stirring, aging, crystallization reaction, filtration, washing, ammonia exchange reaction, drying, and calcination;
• main X-ray characteristic diffraction peak positions 20 of the msect-4 molecular sieve are 7.89±0.1°, 11.9±0.1°, 13.56±0.1°, 14.23±0.1°, 15.64±0.1°, 16.26±0.1°, 16.67±0.1°, 19.62±0.1°, 20.68±0.1°, 21.51±0.1°, 23.46±0.1°, 23.86±0.1°, 25.03±0.1°, 26.32±0.1°, 27.13±0.1°, 27.4±0.1°, 28.25±0.1°, 28.51±0.1°, 30.7±0.1°, 31.4±0.1°, 31.63±0.1°, 31.96±0.1°, 33.63±0.1°, 36.09±0.1°, 36.35±0.1°, 39.49±0.1°, 41.1±0.1°, 42.89±0.1°, 43.27±0.1°, 43.65±0.1°, 45.88±0.1°, 46.53±0.1°, 48.43±0.1°, 49.181±0.1°, 49.86±0.1°, 50.67±0.1°, 51.72±0.1°, 52.52±0.1°, 54.03±0.1°, 55.73±0.1°, 56.37±0.1°, 58.34±0.1°, 59.64±0.1°, 61.23±0.1°, 61.77±0.1°, 63.7±0.1°, 65.3±0.1°, 65.72±0.1°, 66.61±0.1°, 67.97±0.1°, 68.79±0.1°, 70.43±0.1°, 70.72±0.1°, 72.38±0.1°, 74.7±0.1°, 75.321±0.1°, 76.8±0.1°, and 78.56±0.1°;
• and
• the msect-4 molecular sieves have at least two framework types of OFF and ERI, with a silicon-aluminum atomic molar ratio range of 1-200.