Y molecular sieve with high relative crystallinity and high silica-alumina ratio and preparation method thereof

• Main Authors: HONG MEIHUA, WANG YINBIN, JIANG XUEDAN, QIU YU, HONG LUWEI, WANG YANG, LIU GUANFENG, ZHANG XUEMEI, WANG LINGTAO, YU HAIBIN, ZANG JIAZHONG, SHI FANG
• Format: Patent
• Language: Chinese; English
• Published: 01.07.2022
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention discloses a Y molecular sieve with high relative crystallinity and high silica-alumina ratio and a preparation method thereof. The method comprises the following steps: mixing a silicon source, a guiding agent, an aluminum source and fluoborate to form gel, wherein the molar ratio of Na2O to Al2O3 to SiO2 to H2O to fluoborate is (0.5-10): (1): (5-40): (80-800): (0.01-0.5); carrying out static crystallization on the prepared mixed gel at 90-150 DEG C for 6-72 hours to obtain a boron-containing heteroatom Y molecular sieve; and introducing dry gas which is saturated by a gas phase crystallization substitution agent into the dried boron-containing heteroatom Y molecular sieve, and reacting at 140-800 DEG C for 0.1-48 hours to obtain the Y molecular sieve with high relative crystallinity and high silica-alumina ratio. The relative crystallinity of the Y molecular sieve with the high silica-alumina ratio is larger than 90%, the silica-alumina ratio is larger than 10, the preparation process is simple