A kind of supported heteropolyacid catalyst and preparation method thereof

Abstract

The invention discloses a supported heteropolyacid catalyst and a preparation method thereof. The catalyst comprises an active component, an auxiliary agent and a carrier; the active component is a heteropolyacid, and the auxiliary agent is selected from one of rare earth elements Or several, the carrier is petroleum coke-based activated carbon. The preparation method is as follows: mixing petroleum coke, a metal soluble salt containing an auxiliary agent and an activator, mixing uniformly and then activating, and then performing washing and drying treatments; finally, introducing a heteropolyacid, and then drying and roasting to obtain a supported heteropolyacid catalyst. The catalyst prepared by the method of the invention has high low-temperature activity, selectivity and anti-coking performance.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a catalytic material and a preparation method thereof, in particular to a supported heteropolyacid catalyst and a preparation method thereof. Background technique [0002] Dimethy Ether (abbreviated DME) is a colorless, non-toxic gas at normal temperature and pressure, which can be compressed into a liquid. DME is an important organic chemical raw material and chemical intermediate, which can be used in aerosols, refrigerants, alkylating agents, pharmaceuticals, cosmetics, fuels and other industries. [0003] Dimethyl ether was first obtained by rectifying the by-product of high-pressure methanol production, and soon developed into two processes: methanol dehydration and synthesis gas direct synthesis. The liquid phase method of methanol dehydration to produce dimethyl ether, the reaction is carried out in the liquid phase, the main disadvantage is that the equipment is seriously ...

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Problems solved by technology

[0004] At present, the catalyst used for methanol dehydration is generally Al 2 o 3 Or molecular sieves, wherein commonly used molecular sieves include aluminum phosphate, HZSM-5, HY, SAPO, etc., and they all have their own advantages and disadvantages: although alumina has high stability, the reaction temperature is high, and the requirements for reaction equipment are very high, resulting in The cost is high; molecular sieve catalysts have strong acidity and low initial temperature, but they also have the disadvantages of many by-products, easy carbon deposition, and easy deactivation

When the above-mentioned catalyst is used to process pure methanol raw materials under normal pressure, its selectivity is relatively high, but its low-temperature activity is not good, and further improvement is needed.

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