Catalyst used for isobutane dehydrogenation for preparing isobutylene, and preparation method thereof

Abstract

The invention provides a catalyst used for isobutane dehydrogenation for preparing isobutylene, and a preparation method thereof. The catalyst comprises, by mass, 8-35% of iron, 8-30% of vanadium, 25-71% of aluminum and 10-22% of assistant elements. The invention also provides a preparation method of the catalyst. The preparation method comprises the following steps: 1, dissolving a vanadium precursor in a saturated oxalic acid solution, dissolving precursors of iron, aluminum and the assistant elements in the same aqueous solution, and mixing the obtained vanadium precursor solution with the obtained aqueous solution; 2, adding ammonia water to a mixed solution obtained in step 1 to form sol; 3, transferring the sol into a reaction kettle, and processing the sol to obtain a solid; and calcining the solid to obtain the catalyst. The catalyst has the advantages of high catalysis efficiency, low cost, simplicity in preparation, and easiness in industrial production.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for preparing isobutene by catalytic dehydrogenation of isobutane, which belongs to the field of petrochemical industry. Background technique [0002] my country is rich in C4 resources, and with the development of the petroleum industry, the demand for butene is increasing. Therefore, the research and development of new technologies for butane dehydrogenation to butene, and the addition of low-value-added butane to high-value-added butene not only solve the problem of surplus butane resources, but also solve the demand for related olefins in my country , which is conducive to the deep development and utilization of liquefied petroleum gas and the realization of circular economy. [0003] At present, there are two main types of catalysts used in the industrial production of isobutane dehydrogenation, one is chromium-based catalyst system, such as Cr 2 o 3 / Al 2 o 3 system, the catalys...

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Problems solved by technology

[0009] For the catalytic dehydrogenation reaction of isobutane, the acidity of the catalyst surface plays a crucial role. In the catalyst provided by the invention, iron is added as the main active component, and vanadium, aluminum and other auxiliary elements are added at the same time. Form a synergistic effect between each other to change the surface morphology of the catalyst, thereby adjusting the surface acidity of the catalyst; it is because of the synergistic effect that the surface acidity of the catalyst can still form a good reaction to isobutane on the one hand. Adsorption to complete the activation of isobutane; on the other hand, the surface acidity of the catalyst is not so strong that it is difficult for the active intermediate to detach from the surface of the catalyst, resulting in a deep reaction; effectively solve the traditional dehydrogenation with iron as the main component Catalyst efficiency is too low

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