Cu/rare earth-SSZ-13 molecular sieve synthesized from cheap zeolite through one-step crystal transformation and preparation method and application of Cu/rare earth-SSZ-13 molecular sieve

• Main Authors: ZHANG CHENG, YUAN LONG, REN JIA, CHENG HONGKUI, LI YUANDONG, ZHOU TONG, WANG YI, LIU YANG
• Format: Patent
• Language: Chinese; English
• Published: 23.01.2024
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING

The invention provides a preparation method for synthesizing a Cu/rare earth-SSZ-13 molecular sieve from cheap zeolite through one-step crystal transformation and application of the Cu/rare earth-SSZ-13 molecular sieve, and belongs to the technical field of molecular sieve synthesis. The preparation method comprises the following steps: dispersing a complex (Cu-TEPA) of copper and tetraethylenepentamine and rare earth metal in deionized water, sequentially adding cheap zeolite, a silicon source and a seed crystal after uniform dispersion, continuously adding an alkali source and N, N, N-trimethyl adamantyl ammonium hydroxide after uniform stirring to finally obtain initial gel, and crystallizing, washing, drying and roasting to obtain molecular sieve raw powder. The molecular sieve raw powder is applied to an ammonia selective catalytic reduction reaction after being subjected to ammonia exchange to remove excessive copper ions. According to the method, copper ions and rare earth metal ions are introduced in