Preparation method of core-shell structure loaded catalyst

Abstract

The invention discloses a preparation method of a core-shell structure loaded catalyst. The preparation method of the core-shell structure loaded catalyst includes the steps of: first, preparation ofiron oxide hollow spheres; second, preparation of the active component Cu-Ni / Fe2O3 core-shell structure; third, hydrothermal synthesis of a ZSM-5 molecular sieve; and fourth, preparation of the core-shell structure loaded catalyst. According to the invention, when the core-shell structure is attached to the molecular sieve surface, the lattice defect in the molecular sieve and the stirring effectguide the embedding of the core-shell structure into the internal framework of the molecular sieve, and then by means of the hydrolytic precipitation of sodium bicarbonate, a uniform gel can be obtained. And the principle of high temperature roasting at 500-600DEG C lies in that: the intramolecular binding force increases gradually under the circumstance of high temperature, and the internal framework of ZSM-5 molecular sieve can shrink to a certain extent, under the shrinkage state, the prepared catalyst is more stable, and is not easy to inactivate in the reaction process, thus providing thereaction better catalytic activity.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a preparation method of a core-shell structure supported catalyst. Background technique [0002] Energy and the environment are two major issues facing the world today. After entering the 21st century, the excessive dependence of the economy on energy has caused environmental problems to become prominent. The development and utilization of new energy has become a major strategic demand to alleviate the contradiction between world energy supply and demand, realize energy diversification, and maintain sustainable development of the economic environment. [0003] Hydrogen energy does not produce any pollution emissions when it is used, it is an ideal choice for future clean energy carriers, and it is also an important way to replace petroleum to solve the problem of transportation fuel. Since the 1990s, major automobile manufacturers and oil companies in the United States, Europe...

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Problems solved by technology

[0008] The particle size of the iron oxide hollow spheres prepared in the present invention is at the nanoscale, and the particle dispersion is better; the purpose of adding hydrofluoric acid aqueous solution is to dissolve the silicon dioxide nanospheres inside the iron oxide, so that it can form Iron oxide hollow spheres; and hydrofluoric acid can slightly corrode the surface of iron oxide hollow spheres and form grooves, which helps catalyst active components enter the grooves and form a shell-like structure on the surface of iron oxide hollow spheres, solving the problem of shell-like The problem of weak structure

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