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, wherein the active componentis heteropolyacid, the auxiliary agent is selected from one or more of rare earth elements, and the carrier is petroleum coke-based activated carbon. The preparation method comprises the following steps: mixing petroleum coke, auxiliary-containing metal soluble salt and an activating agent, uniformly mixing, activating, washing and drying; and finally, introducing heteropolyacid, drying and roasting to obtain the supported heteropolyacid catalyst. The catalyst prepared by the method has high low-temperature activity, selectivity and carbon deposition resistance.

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] Dimethyl ether (Dimethy Ether, abbreviated as DME) is a colorless, non-toxic gas at normal temperature and pressure, which can be compressed into a liquid. Dimethyl ether 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 produced by rectification of by-products in high-pressure methanol production, and soon developed into two processes of methanol dehydration and direct synthesis of synthesis gas. The liquid-phase method of methanol dehydration to produce dimethyl ether, the reaction is carried out in the liquid phase, the main disadvanta...

AI Technical Summary

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.

Images