The Introduction of SAPO-34

SAPO-34 is a similar crystal structure of the microporous zeolite Ling, a new type of molecular sieve, are trigonal, with eight yuan of its cage-like crystal ring network structure. SAPO-34 molecular sieves with appropriate acidic and pore structure in the MTO (Methanol to olefins), DMTO other catalytic processes to deliver superior performance. As the SAPO-34 have high thermal stability and resistance to water heat stability, it can be used as automotive exhaust catalyst. In addition, SAPO-34 also has a good adsorption function, gas adsorption and separation also has a wide range of applications.
SAPO-34 molecular sieves to the current preparation methods based hydrothermal method. Gas-phase molecular sieve as a method of preparation, such as the ZSM-5 zeolite research more in-depth, but in the aluminum phosphate molecular sieve synthesis research is not over. Gas-phase synthesis is in the process, the first synthesis of the zeolite precursor solution under certain conditions, to remove moisture and volatile solvents prepared rubber, adhesive and then placed in the upper part of the reactor, while the bottom of the reactor by adding a certain amount of organic amine and water mixture as a template, to a certain temperature, reaction time has been zeolite products. We use a variety of organic template, such as morpholine, triethylamine, triethanolamine, diisopropylamine and two propylamine as a template prepared SAPO-34 molecular sieve. SAPO-34 molecular sieves in order to increase the crystallinity and the yield, we use the two-template prepared SAPO-34 molecular sieve, that is, in both the adhesive and the liquid part of the added organic amine template to prepare SAPO-34 molecular sieve.
Technical Advantages
1. instead of the traditional use of gas-phase hydrothermal synthesis of SAPO-34 molecular sieve, eliminating the need for hydrothermal synthesis of zeolites with the mother liquor separation process, reducing waste emissions and reduce labor intensity.
2.gas-phase synthesis of SAPO-34 molecular sieve, high conversion rate, particle size is easy to control, the range of 0.5-5μm.
3. The use of microwave heating can greatly shorten the zeolite synthesis time, improve efficiency, reduce energy consumption.
Methanol to olefins (MTO) reaction is the most promising alternative to conventional oil production of light olefins route emerging process route. MTO reaction as the core of the catalyst synthesis become focus of the study. SAPO-34 molecular sieve with its high methanol conversion rate and excellent ethylene, propylene selectivity become the best catalyst for MTO reaction.
However, due to SAPO-34 microporous molecular sieve by its limitations, Kong Daorong susceptible to blockage resulting in a shorter carbon catalyst life. So effectively improve the SAPO-34 molecular sieve catalyst life for promoting industrialization MTO reaction has an extremely important significance. Working on this paper the synthesis of SAPO-34 molecular sieves and modified, so as to achieve the purpose of improving the catalyst life. Paper examines the morpholine (MOR), triethylamine (TEA) and tetraethyl ammonium hydroxide (TEAOH) template, and three kinds of gas transfer (VPT) method for the synthesis of SAPO-34 molecular sieve effect. Purpose is to find a cheap, simple and stable formulations SAPO-34 molecular sieve synthesis, provide a good basis for its modification.
Results of the surface: (1) three template synthesis catalyst grain size descending to MOR-SAPO-34> TEA-SAPO-34> TEAOH-SAPO-34; (2) from long to short catalyst life for the TEAOH -SAPO-34 ≈ TEA-SAPO-34> MOR-SAPO-34; (3) although, as a template TEAOH SAPO-34 molecular sieve synthesis of the longest life expectancy, but because the application is not suitable for TEAOH expensive, so in order to TEA as a template for synthesis SAPO-34 molecular sieve is more suitable for industrial and laboratory applications. (4) VPT synthesis of SAPO-34 molecular sieve, because the crystallization caused by the lack of dispersion medium low, short life.

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