Boron nitride catalyst for light alkane or alkylbenzene oxydehydrogenation and preparing method and application thereof

Abstract

The invention discloses a boron nitride catalyst for oxidative dehydrogenation of light alkanes or alkylbenzenes, a preparation method and application thereof, and belongs to the technical field of catalyst preparation and application. The catalyst preparation process is as follows: first prepare materials containing boron nitride, including boron nitride materials and composite materials containing boron nitride; ~1000°C, the activation time is more than 30 minutes, the boron nitride catalyst is obtained; under normal pressure, 350-800°C, the obtained boron nitride catalyst is used for the dehydrogenation reaction of C2-C5 alkanes or ethylbenzene, It can produce corresponding unsaturated hydrocarbons such as C2-C5 olefins and styrene with high selectivity. The catalyst prepared by the invention has the characteristics of high olefin selectivity, no carbon deposition, long service life, etc., does not generate excessively oxidized carbon dioxide, has a simple synthesis method, is metal-free, and has no pollution, and has the prospect of industrial application.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and application, and in particular relates to a boron nitride catalyst for oxidative dehydrogenation of light alkanes or alkylbenzenes, a preparation method and application thereof. Background technique [0002] Efficient conversion of low-carbon alkanes (C2-C5) to produce corresponding olefins can not only accelerate the use of non-traditional fuel gas as a supplementary raw material for fossil energy, but also relieve the chemical industry from relying solely on petroleum resources. This is the 21st century energy utilization and conversion field. milestone. Since the 1930s, the direct dehydrogenation process for the production of olefins from low-carbon alkanes has been used in the chemical industry. This process is limited by thermodynamic equilibrium, and usually requires high reaction temperature and low reaction pressure to achieve high conversion. Under harsh conditions, it w...

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Problems solved by technology

Since the 1930s, the direct dehydrogenation process for the production of olefins from low-carbon alkanes has been used in the chemical industry. This process is limited by thermodynamic equilibrium, and usually requires high reaction temperature and low reaction pressure to achieve high conversion. Under harsh conditions, will lead to rapid catalyst deactivation

In 2014, Jesper J.H.B.Sattler et al. (Chem.Rev., 2014,114:10613‐10653) summarized and compared the catalysts for direct dehydrogenation industrial applications, mainly including noble metal platinum-based catalysts, transition metal chromium-based, vanadium-based, Molybdenum-based, gallium-based and other catalysts, they pointed out that these metal catalysts have different advantages, but the process consumes a lot of energy, and the serious deactivation of the catalyst caused by carbon deposition and coking limits the further development of the direct dehydrogenation process

Usually, the single-pass yield of olefins produced by the oxidative dehydrogenation reaction of the same amount of raw materials is even lower than that of the direct dehydrogenation reaction, which will cause an extreme waste of raw materials, and at the same time, the carbon oxides released by excessive oxidation will have a bad impact on the environment. The strong exothermic effect caused by this also makes the alkane oxidative dehydrogenation process unable to realize industrial application so far.

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