Environment-friendly catalyst for preparing propylene by directly dehydrogenating propane and preparation method thereof

Abstract

The invention belongs to the field of catalysts, and particularly relates to an environment-friendly catalyst for preparing propylene by directly dehydrogenating propane and a preparation method of the catalyst, wherein the particle size of the catalyst is 40-150 [mu] m; the catalyst comprises 30%-70% of a Zn-doped Hbeta molecular sieve, 15%-50% of Al2O3 and 3%-30% of a multi-element active modifier, wherein the modifier comprises at least one element of W, Mo, Mn, Zr, Ni, Fe and Co as a first modifier, at least one element of Ga, In, P, La and Ce as a second modifier, and any one element of Sr, Ba, Ca, Mg, Na and Li as a third modifier, and the sum of the mass percentages of oxides of all the element components is 100%. The prepared fluidized bed dehydrogenation catalyst is low in cost and good in wear resistance, and has good dehydrogenation activity and stability when used for propane dehydrogenation.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to an environment-friendly catalyst for direct dehydrogenation of propane to propylene and a preparation method of the catalyst. Background technique [0002] Propylene is one of the important basic organic chemical raw materials and occupies an important position in the modern petroleum and chemical industry. Its global consumption is as high as 90 million tons, of which 58% is used for the manufacture of polypropylene, and about 10%, 8%, 7% and 6% for the manufacture of acrylonitrile, oxo alcohol, propylene oxide and cumene, respectively. . With the rapid growth of demand for polypropylene derivatives in various industries, the demand for propylene is also increasing year by year. Considering economics and maturity indicators comprehensively, propane dehydrogenation (PDH) technology is currently the most competitive propylene manufacturing process. Propane dehydrogenation t...

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Problems solved by technology

[0004] Chinese patents CN109289908A and CN109675548A provide molecular sieves as carriers, which require a special method to synthesize molecular sieves, and then impregnate them, and the actual volumetric space velocity of propane is relatively low, so it is difficult to apply in fluidized bed reactors; CN109939688A and CN 109926038A catalysts Although relatively new, no regenerative effects are mentioned

Chinese patent CN109382090A discloses a molybdenum vanadium double metal oxide catalyst, and the activity is very good, but the toxicity of vanadium oxide is relatively high, and it has strong carcinogenicity

However, dehydrogenation catalysts based on single or composite metal oxides have the problem of uncoordinated conversion and selectivity, and there is still room for optimization and improvement.

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