Method for improving catalytic selectivity of metal nanoparticle/porous coordination polymer composite catalyst and application thereof

Abstract

The invention relates to a method for improving catalytic selectivity of a metal nanoparticle / porous coordination polymer composite catalyst and application thereof. A passivator with the size larger than the hole diameter of porous coordination polymer is utilized to passivate metal nanoparticles compounded on the outer surface of the porous coordination polymer to reduce or inhibit catalytic activity thereof; meanwhile, catalytic activity of the metal nanoparticles in hole channels of the porous coordination polymer is kept; thus, the catalytic selectivity of the metal nanoparticle / porous coordination polymer composite catalyst is improved. A poisoningpassivating effect of the passivator to a metal catalyst is utilized, and a trace of reagents of quinoline, mercaptan and the like are introduced into a catalytic reaction system to passivate a part of metal nanoparticles being unfavorable for selective catalyst in the composite catalyst. When the method is applied to catalytic hydrogenation reaction of olefin, molecular dimension selectivity or chemical reaction locus selectivity can be effectively improved. The method is simple, easy and practicable and provides a novel design idea for further improving the catalytic selectivity of the composite catalyst.

Description

technical field [0001] The invention relates to the technical field of selective catalysts, in particular to a method for improving the catalytic selectivity of a metal nanoparticle / porous coordination polymer composite catalyst and its application. Background technique [0002] In the field of modern chemical catalysis, people's requirements for catalysts are not only satisfied with their high-efficiency catalytic activity, but good catalytic selectivity has become a more critical factor, which stems from the chemical industry's demand for higher atom economy. In recent years, through precise control of the preparation process, scientists have developed a variety of noble metal nanocatalysts with different shapes and sizes such as Au, Ag, Pt, Pd, etc., using the shape, size and exposed active crystal faces of noble metal nanoparticles to adjust their catalytic selectivity. However, the preparation of noble metal nanoparticles with unique selectivity requires delicate proce...

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Problems solved by technology

However, this method has its own inevitable shortcomings, that is, it is difficult to completely confine all the metal nanoparticles inside the porous coordination polymer, and the metal nanoparticles supported on the surface of the porous coordination polymer play a role in the selective catalytic reaction to a certain extent. lower catalytic selectivity

Although the latter can completely encapsulate metal nanoparticles in porous coordination polymers, it requires the introduction of surfactants, and is currently only applicable to specific porous coordination polymers, and the scale of preparation is also limited.

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