Method for preparing high-transition metal content molecular sieves

Abstract

The invention relates to a method for preparing high-transition metal content molecular sieves. In the invention, Ni-ZSM-5, Co-ZSM-5 and Cu-ZSM-5 molecular sieves the transition metal contents of which respectively reach up to 15% are successfully designed and synthetized by taking ion association formed by the interaction of the traditional template agent and the metal complex as a template agent for synthetizing the molecular sieves and directly introducing metal ions to the skeletons of the molecular sieves by the template agent. The high-transition metal content heteroatom molecular sieve material has regular crystal structure, uniform bore diameter, bigger specific surface area and pore volume as well as good thermostability and hydrothermal stability.

Description

1. Technical field [0001] The invention relates to a preparation method of molecular sieves with high transition metal content, in particular to a preparation method of Ni-ZSM-5, Co-ZSM-5 and Cu-ZSM-5 molecular sieves with high transition metal content. 2. Background technology [0002] Molecular sieve, also known as zeolite, is abundant in nature and can also be synthesized artificially. Since 1960, molecular sieves, as catalysts and catalyst supports, have been widely valued and developed greatly in all countries in the world. In particular, great achievements have been made in catalytic cracking, catalytic hydrocracking, hydroisomerization and alkylation, and gradually become the core technology of oil refining and petroleum industry. [0003] ZSM-5 molecular sieve is a new type of high-silica zeolite molecular sieve developed by Mobil Corporation of the United States in 1972. The patent U.S. Patent 3702866 first introduced the preparation method of ZSM-5 zeolite molecul...

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Problems solved by technology

[0006] In terms of the synthesis of heteroatom molecular sieves, the domestic patent CN 96117259 adopts the Zr metal element molecular sieve prepared by the ion exchange method, the Na type molecular sieve is ion exchanged into the H type molecular sieve, and then impregnated with a soluble salt solution containing Zr, and the metal Zr is loaded on the On the molecular sieve, the molecular sieve obtained by this method has defects such as uneven surface

CN 98 123933.1, CN 101121526A and US 6773694BI also introduced the heteroatom molecular sieve Fe-ZSM-5 obtained by the direct synthesis method, CN 101073778A in situ synthesis of Ag / Al-ZSM-5, CN 101066532A introduced a skeleton containing Sn ZSM-5 molecular sieve, but the metal content of the molecular sieve prepared by the direct method is generally below 5%, and the distribution of metal ions is uneven

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