Synthesis method of SSZ-13 molecular sieve

Abstract

The invention provides a synthesis method of an SSZ-13 molecular sieve. A USY molecular sieve or Beta molecular sieve with adsorbed N,N,N-trimethyl-1-adamantanamine cations is used as a structure guide agent to synthesize the SSZ-13 molecular sieve together with an aluminum source, a silicon source, an alkali source, water and mixed seeds, thereby greatly reducing the consumption of the expensive template N,N,N-trimethyl-1-adamantanamine cations in the traditional method, and obviously lowering the cost for synthesizing the SSZ-13 molecular sieve. The method can enhance the crystallization rate of the SSZ-13 molecular sieve and shorten the required crystallization time, and thus, is more beneficial to industrial production. The SSZ-13 molecular sieve synthesized by the method has high crystallinity and favorable hydrothermal stability; and the synthesized SSZ-13 molecular sieve can be used as an MTO (Methanol To Olefins) catalyst and can also be used as an automobile tail gas treatment catalyst support.

Description

technical field [0001] The invention belongs to the field of inorganic synthesis and catalyst preparation, and in particular relates to a synthesis method of SSZ-13 molecular sieve. Background technique [0002] SSZ-13 molecular sieve has good thermal stability and can be used as a carrier for adsorbents or catalysts, such as air purifiers, automobile exhaust catalysts, etc. At the same time, SSZ-13 molecular sieve also has cation exchange and acidity adjustability, so it has good catalytic performance for various reaction processes such as catalytic cracking and hydrocracking of hydrocarbons, and olefin and aromatic hydrocarbon construction reactions. [0003] US Patent No. 4544538 discloses a synthesis method of SSZ-13 molecular sieve for the first time. In this method, N,N,N-trimethyl-1-adamantanamine (TMAA+) organic cation was used as template to synthesize SSZ-13 molecular sieve. However, N,N,N-trimethyl-1-adamantanamine is expensive, resulting in high cost of synthes...

AI Technical Summary

Problems solved by technology

The method uses choline chloride as a template, replacing the previous use of N,N,N-trimethyl-1-adamantylamine (TMAA+) cations and benzyltrimethylammonium cations as templates, and synthesizes SSZ-13 molecular sieve was produced. Although this scheme uses a relatively cheap template agent, the synthesis time is at least 4 days, which leads to an increase in synthesis cost and has brought considerable obstacles to the industrial production of SSZ-13 molecular sieve.

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