Iron-gallium-based propane dehydrogenation catalyst and preparation method thereof

Abstract

The invention provides an iron-gallium-based propane dehydrogenation catalyst, which uses alumina as a carrier, wherein the content of an iron element is 1-10wt% of the alumina carrier; the content ofa gallium element is 1-10wt% of the alumina carrier; the molar ratio of the iron element to the gallium element is 1: 4-6: 1; the content of an oxygen element is 47-52.5wt% of the alumina carrier; and the surface area of the alumina carrier is 50-200m <2>/g, the pore diameter is 10-20nm, and the pore volume is 0.4-0.5cm <3>/g. The preparation method of the catalyst comprises the following steps of: adding an alumina carrier into a gallium nitrate solution, uniformly stirring, adjusting the pH value to be 3-4, and standing and aging; adding a ferric nitrate solution, uniformly stirring, adjusting the pH value to be 5-7, and standing and aging; and filtering, washing, drying, reducing and annealing the precipitates to form the propane dehydrogenation catalyst. The iron-gallium-based propanedehydrogenation catalyst is high in conversion rate and selectivity and good in stability; and the preparation method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the field of propane dehydrogenation catalysts, and in particular relates to an iron-gallium-based propane dehydrogenation catalyst and a preparation method thereof. Background technique [0002] The production of olefins is critical to the polymer and chemical industries and is widely used as intermediates in the production of transportation fuels. Traditional propylene production is usually through steam cracking and catalytic cracking: steam cracking is a deep thermal cracking process of naphtha at high temperature, does not use a catalyst, follows a free radical reaction mechanism, and provides a large amount of propylene by-products; catalytic cracking is a refinery Fluid catalytic cracking uses catalysts at high temperatures to crack heavy oil and produce a large amount of propylene by-products. However, in recent years, with the development of shale gas extraction technology, the raw material for ethylene cracking has c...

AI Technical Summary

Problems solved by technology

Existing research work has shown that, in addition to the platinum-based and chromium-based catalysts that have achieved a certain degree of success in the direct dehydrogenation of propane, some non-noble metal oxides (such as vanadium oxide, iron oxide, molybdenum oxide, and gallium oxide, etc.) The reaction also shows a certain activity and selectivity, but the catalyst is easily reduced and deactivated quickly under the reaction conditions, so frequent regeneration is required

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