Nanocomposite catalyst for ethane oxidative dehydrogenation reaction and preparing method thereof

Abstract

The invention discloses a nanocomposite catalyst for an ethane oxidative dehydrogenation reaction and a preparing method thereof. According to the method, firstly, an M1 purity-phase compound in a vanadium molybdenum niobium tellurium multielement metal oxide system is obtained through hydro-thermal synthesis and hydrogen peroxide purification processing; then, cerium oxide sol with the mass fraction of CeO2 being 5-30% is prepared; two methods, namely the sol-gel method and the physical mixing method are adopted, and the M1 purity-phase compound in the vanadium molybdenum niobium tellurium multielement metal oxide system and a finished product of cerium oxide nanometer complex catalyst are obtained. According to the prepared nanocomposite catalyst, the surface of rod-shaped crystal of the M1 purity-phase compound is evenly provided with a great mount of CeO2 nanometer particles, and the grain diameter of the CeO2 ranges from 2 nm to 30 nm. The nanocomposite catalyst has higher catalytic activity and selectivity in the ethane oxidative dehydrogenation reaction process, and meanwhile the synthesizing cost of the vanadium molybdenum niobium tellurium multielement metal oxide system can be lowered through the introduction of the CeO2.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysis, and in particular relates to a nanocomposite catalyst which can be used in the process of oxidative dehydrogenation of ethane to produce ethylene and a preparation method thereof. Background technique [0002] The contradiction between the increasingly severe energy and environmental problems and the increasing demand for ethylene is a major problem in the development of the chemical industry today. Compared with the increasingly depleted petroleum resources, the optimization of ethylene production process and the development of new processes using ethane as raw material have received more and more attention, and the raw materials for ethylene production worldwide have shown a clear trend of light weight. [0003] The ways to produce ethylene from ethane mainly include steam cracking, catalytic direct dehydrogenation, catalytic oxidative dehydrogenation and catalytic weak oxidative d...

AI Technical Summary

Problems solved by technology

The oxidative dehydrogenation of ethane to ethylene has more advantages than the steam cracking and catalytic direct dehydrogenation processes that have been industrialized, but limited by the current catalyst production capacity and the development level of related reactors, the oxidative dehydrogenation process of ethane Large-scale industrial production has not yet been realized

The M1 pure phase catalyst in the molybdenum vanadium niobium tellurium multi-metal oxide system is currently a catalyst system with great application prospects. It has high ethane conversion and ethylene selectivity at a low reaction temperature, but the production of the catalyst itself Capabilities are still far from industrial requirements

M1 pure phase catalysts are generally prepared by hydrothermal synthesis or precipitation method supplemented by appropriate purification process, and the complicated preparation process will cause obvious mass loss

Considering that the chemical raw materials required in the preparation process of M1 pure-phase catalyst are expensive, the high synthesis cost of this catalyst is also one of the important factors that limit the final industrialization of this process.

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