High-intensity low-carbon alkane dehydrogenation catalyst and preparation method thereof

Abstract

The invention relates to a high-intensity low-carbon alkane dehydrogenation catalyst and a preparation method thereof. The preparation method comprises the following steps: mixing a catalyst carrier precursor, an active component precursor, a structural additive precursor and an active additive precursor, and forming once, drying, and baking to prepare the catalyst. The low-carbon alkane dehydrogenation catalyst prepared by the invention is high in activity and selectivity, is good in structural stability, can be applied to the dehydration reaction of C3-C5 alkane, and is used for fixed bed reactors, mobile bed reactors and fluidized bed reactors.

Description

technical field [0001] The invention relates to a high-strength low-carbon alkane dehydrogenation catalyst and a preparation method thereof, belonging to the field of chemistry. Background technique [0002] The dehydrogenation of low-carbon alkanes to produce low-carbon olefins is an important industrial production process. For example, the dehydrogenation of propane to produce propylene and the dehydrogenation of isobutane to produce isobutene have important practical value. Propylene and isobutene are widely used and are important chemical industries. raw material. with Cr 2 o 3 / Al 2 o 3 As a catalyst, it can dehydrogenate propane or isobutane to produce propylene or isobutene at a reaction temperature of about 600°C. Use Cr 2 o 3 / Al 2 o 3 When used as a dehydrogenation catalyst, although this catalyst has a high dehydrogenation activity, it has the problem of rapid coking during the dehydrogenation process and needs to be regenerated repeatedly. With the incr...

AI Technical Summary

Problems solved by technology

The structural stability of the catalyst prepared by this method is better, but because the catalyst carrier has been roasted at high temperature, its interaction with the active component is weak, and the active component is easy to fall off and cause the catalyst to be deactivated. Another point is that the pore volume of the catalyst is small , the catalyst is prone to carbon deposition and deactivation

[0004] Chinese patent CN668555A discloses a dehydrogenation catalyst containing alumina, chromium oxide, lithium oxide and sodium oxide. The catalyst is also prepared by first preparing an alumina carrier, and then the active components are loaded by impregnation, and there are still active components. Problems with weak interactions with the carrier

The catalyst is made of Cr 2 o 3 , CaO, K 2 O, Al 2 o 3 Composition, with Cr 2 o 3 The powder is used as a raw material, and 10% nitric acid is used as a peptizer to make a dehydrogenation catalyst through kneading, extruding, drying, and roasting. Although this method partially solves the problem of uneven distribution of active components in the catalyst, due to the use of Cr 2 o 3 Powder is the raw material, and its interaction with alumina is weak, therefore, the structural stability of the catalyst remains unresolved