Preparation method of saturated hydrogenation Pd catalyst and method for catalyzing hydrogenation of polystyrene by virtue of saturated hydrogenation Pd catalyst

Abstract

The invention relates to the technical field of catalytic hydrogenation and particularly discloses a preparation method of a saturated hydrogenation Pd catalyst and a method for catalyzing the hydrogenation of polystyrene by virtue of the saturated hydrogenation Pd catalyst. The preparation method is characterized by comprising the following steps: with P123 as a template, ethyl orthosilicate as a silicon source and 1,3,5-trimethylbenzene and ammonium fluoride as pore-enlarging agents, synthesizing by virtue of a hydrothermal method under an acidic condition, drying, and roasting, so as to obtain a powdery MCF material; calculating the mass of palladium metal salt according to a proportion that palladium is 1.0wt%-8.0wt% of the powdery MCF material, and dissolving the palladium metal salt, so as to prepare steeping liquid; and steeping the powdery MCF material into the steeping liquid, drying, roasting, and carrying out formation and sieving, so as to obtain a catalyst product. The preparation method has the beneficial effects that the steps are simple, and the catalyst is prepared from Pd as a main catalysis element as well as home-made MCF which has a relatively large specific surface, an adjustable super-large mesoporous and a three-dimensional penetrated pore system, so that the PS hydrogenation conversion rate is substantially increased.

Description

(1) Technical field [0001] The invention relates to the technical field of catalytic hydrogenation, in particular to a preparation of a saturated hydrogenation Pd catalyst and a method for catalyzing the hydrogenation of polystyrene. (2) Background technology [0002] Polystyrene (PS) is a resin polymerized from styrene and is one of the five general-purpose thermoplastic synthetic resins. Due to the shortcomings of PS, such as poor heat resistance, UV resistance, and brittleness, the current application of PS is limited to low-end products, such as food packaging, toys, hangers, foam plastics, and certain consumer electronics products. However, even in these fields, PS may gradually be replaced by cheaper raw material polypropylene. Polycyclohexylethylene or hydrogenated polystyrene (PCHE) with significantly improved physical properties (glass transition temperature, transparency, heat resistance, oxidation resistance and UV resistance, etc.) can be obtained after hydrogen...

AI Technical Summary

Problems solved by technology

[0003] Now PS hydrogenation is still in the stage of laboratory research. The active components are mainly palladium and platinum. There have been a lot of reports on the research on the carrier, but there are still many problems to be solved: (1) The catalyst carrier includes non-porous materials, mesoporous materials and macroporous materials, non-porous and macroporous materials have very low specific surface area (10-20m 2 / g) make the unit mass catalyst have extremely low hydrogenation active site quantity, in order to ensure the hydrogenation activity, it is necessary to greatly increase the amount of catalyst, thus increasing the cost of hydrogenation

In addition, the particle size of the catalyst will be reduced, thereby increasing the difficulty of separating the catalyst and the polymer solution; (2) the use of a catalyst carrier with a high specific area will inevitably reduce the pore size of the catalyst, which may make the polymer molecules in the catalyst pores. Diffusion is limited, and hydrogenation occurs only on the outer surface of the catalyst, while the support-rich inner surface does not play a role