Catalyst for producing low-carbon olefins by dehydrogenation of low-carbon alkanes and preparation method thereof

Abstract

The invention relates to a light alkane dehydrogenation catalyst carrier and an application thereof and mainly aims at solving the problems of high carbon deposition speed, high conversion ratio reduction speed in a use process and short one-way service life of the catalyst existing in the existing preparation technology. The problems are better solved by the technical scheme: firstly, introducingmagnesium, zirconium and IVA-group metal elements in a periodic table of elements to a silicon-containing carrier by using a precipitation method to obtain a composite metal oxide carrier; then, supporting a platinum metal component by using an impregnation method, namely impregnating a water solution of a soluble salt of platinum, and carrying out drying and roasting to obtain a platinum catalyst; and carrying out reaction by making propane / isobutene as a raw material contact with the catalyst under the conditions that the reaction temperature is 520-650 DEG C, the reaction pressure is 0.1-0.4MPa, the mass space velocity of alkane is 0.1-7.0h<-1> and the volume ratio of H2O / CnH2n+2 is 0.5-18 to produce propene / isobutylene. The light alkane dehydrogenation catalyst carrier can be appliedto industrial preparation of light olefins by light alkane dehydrogenation.

Description

technical field

[0001] The invention relates to a catalyst carrier used for dehydrogenating low-carbon alkanes to produce low-carbon olefins and a preparation method thereof. Background technique

[0002] Propylene / isobutylene mainly comes from the co-production or by-product of steam cracking and fluid catalytic cracking in refineries, and can be widely used in the synthesis of polymers, gasoline additives, rubber and various chemical intermediates. With the increasing demand for low-carbon olefins, the traditional production process is difficult to meet the rapid growth of market demand. A large amount of low-carbon alkanes obtained from refineries are the main components of liquefied petroleum gas, which are mainly used as civil fuels. The development of the process of producing low-carbon alkenes from low-carbon alkanes is of great significance for making full use of low-carbon alkanes to open up new sources of alkenes. At present, the alkane catalytic dehydrogenation ...

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