Porous walnut-shaped catalyst particle

Abstract

The utility model discloses a porous walnut-shaped catalyst particle which is a solid catalyst particle capable of being used for alkylation catalysis. The whole catalyst particles are elliptically spherical; the walnut shape is equally divided into four parts by an inward concave groove; the outer surfaces of the catalyst particles comprise a plurality of pore structures. The catalyst particle is integrally spherical and forms a plurality of porous structures, and the catalyst particle has low density, high porosity and large specific surface area due to more pores and pore channels. According to the utility model, the specific volume and the outer surface area of the catalytic material are effectively increased, and the mass transfer, adsorption and catalytic efficiency in the catalyst reaction process is improved.

Description

Technical Field

[0001] The utility model relates to catalyst particles, in particular to porous walnut-shaped catalyst particles. Background Art

[0002] Catalytic reactions are core processes in the chemical industry, and their efficiency and selectivity directly determine product quality and production economics. The morphology and structure of catalytic materials play a crucial role in catalytic reactions, directly influencing the catalyst's activity, stability, and reaction pathway. In alkylation reactions, the morphology and structure of catalytic materials have a particularly significant impact on reaction performance.

[0003] The morphology and structure of catalytic materials, including their size, shape, exposed crystal faces, and hierarchical structure, have a profound impact on catalytic performance. The morphology and structure of catalytic materials also affect the adsorption and diffusion behavior of reactants on the catalyst surface. For example, catalysts with a porous structure can provide more adsorption sites, which is conducive to the enrichment and conversion of reactant molecules. At the same time, a reasonable pore structure can optimize the diffusion path of reactant molecules, reduce mass transfer resistance, and improve reaction efficiency. Catalytic materials with a porous structure have a larger specific surface area and provide more active sites, thereby increasing the contact opportunities between the catalyst and the reactants and facilitating the reaction. In alkylation reactions, porous catalysts can more effectively adsorb and enrich ethylene molecules, promote their contact and reaction with aniline or o-toluidine, and thus increase the yield of alkylation products.

[0004] Therefore, by designing appropriate catalytic material morphology and structure, it is possible to control the reaction pathway and optimize product selectivity. By adjusting the catalyst preparation process and conditions, and controlling parameters such as the pore size, pore distribution, and specific surface area of the porous structure, new ideas and methods are provided for the development of catalytic reaction technology. Utility Model Content

[0005] The primary technical problem addressed by this utility model is to increase the specific surface area of catalyst particles, thereby improving their efficiency in processes such as alkylation reactions. A larger specific surface area of a catalytic material provides more active sites, increasing contact between the catalyst surface and reactants, thereby improving the activity of the catalytic reaction system. The catalyst particles in this utility model are elliptical, walnut-shaped, and divided into four equal parts by inwardly concave grooves. The outer surface has a plurality of porous structures.

[0006] The specific technical solutions of the utility model include:

[0007] A method for preparing porous walnut-shaped catalyst particles comprises the following steps: first, dissolving a certain amount of surfactant and metal salt A in deionized water; then slowly adding metal salt solution B to the deionized water; and finally, reacting the mixture at a suitable temperature for several hours and collecting a solid product.

[0008] Preferably, the surfactant comprises polyvinyl pyrrolidone, fatty acid glyceride, alkyl alcohol amide and the like.

[0009] Preferably, the metal salt A is a bismuth salt such as sodium bismuthate or bismuth sulfide.

[0010] Preferably, the B metal salt is a copper salt such as copper chloride, copper sulfate, or copper nitrate.

[0011] Preferably, the reaction temperature is 100-160°C.

[0012] Preferably, the reaction time is 10 to 15 hours.

[0013] A porous walnut-shaped catalyst particle, which is ellipsoidal in shape as a whole; the walnut shape is divided into four equal parts by an inwardly concave groove; the outer surface of the catalyst particle includes a plurality of pore structures, and the four outer surfaces are separated from each other; the central part is solidly filled.

[0014] Preferably, the overall size of the catalyst particles is 10 to 20 μm, and the shape of the catalyst particles is an oval walnut.

[0015] Preferably, the radius R1 of the ellipsoidal catalyst particle along the major axis is 6-10 μm, and the radius R2 along the minor axis is 5-8 μm.

[0016] Preferably, the radius R of the inwardly concave groove arc is L =4-6 μm, the number of inward arc-shaped protrusions n=4, and the angle between the tops of the two arcs θ=90°.

[0017] Preferably, the radius R of the pores on the surface of the catalyst particles is m =150~500nm.

[0018] Preferably, the arc length of the ellipse is L1, where 0<L1<πR 11 .

[0019] Preferably, the arc length of the inwardly recessed groove is L2, wherein 0<L2<πR.

[0020] Preferably, the porous walnut-shaped catalyst particles have a sufficiently large specific surface area and porosity, which can increase more active sites for the alkylation reaction.

[0021] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The porous walnut-shaped catalyst particles adopt an exposed uniform porous structure, which provides the catalyst with a larger specific surface area, thereby providing more active sites, optimizing the diffusion path of reactant molecules, reducing mass transfer resistance, and thus increasing catalytic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the novel catalyst particle structure of the present utility model.

[0025] Figure 2 This is a top view of the catalyst particle structure of the present invention.

[0026] Figure 3 This is a scanning electron microscope image of the catalyst particles in Example 2 of the present invention.

[0027] Figure 4 This is a local scanning electron microscope image of the catalyst particles in Example 3 of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described below with reference to the accompanying drawings and embodiments. However, it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0029] like Figure 1-4 As shown, the utility model provides a porous walnut-shaped catalyst particle, which is ellipsoidal in shape as a whole; the walnut shape is divided into four equal parts by inwardly concave grooves; the outer surface of the catalyst particle includes a plurality of pore structures, and the four outer surfaces are separated from each other; the center part is solidly filled.

[0030] The overall size of the catalyst particles is 10 to 20 μm, and the shape of the catalyst particles is an oval walnut.

[0031] The radius R1 of the catalyst particle along the long axis is 6 to 10 μm, and the radius R2 along the short axis is 5 to 8 μm.

[0032] Radius R of the inward concave groove arc L =4-6 μm, the number of inward arc-shaped protrusions n=4, and the angle between the tops of the two arcs θ=90°.

[0033] Radius R of the pores on the surface of the catalyst particles m =150~500nm.

[0034] The arc length of the ellipse is L1, where 0<L1<πR 11 .

[0035] The arc length of the inwardly recessed groove is L2, where 0<L2<πR.

[0036] The porous walnut-shaped catalyst particles have a distinct porous structure, which greatly increases the specific surface area, thereby effectively improving the reaction activity of the catalyst.

[0037] Example 1:

[0038] The preparation method of the porous walnut-shaped catalyst particles in this embodiment is as follows: first, 0.2g of alkyl alcohol amide and 0.8g of sodium bismuthate are dissolved in deionized water; then, 0.1M copper chloride solution is slowly added to the deionized water; finally, the mixture is reacted at 110°C for 12 hours, and the solid product is collected by centrifugation and washing to obtain the target catalyst particles. The structural diagram of the porous walnut-shaped catalyst particles in this embodiment is shown in FIG. Figure 1 The specific parameters and dimensions are shown in Table 1. The catalyst particles are elliptical spherical walnut-shaped, separated by four inward concave arcs, and have a number of evenly distributed pore structures on the surface. The overall size is about 12μm, the radius of the elliptical spherical along the long axis is R1 = 6μm, and the radius along the short axis is R2 = 5μm; the number of inward concave arcs n = 4, and the radius of the inward concave arc R L = 4 μm, the angle between the two arc tops is θ = 90°; the radius of the surface pores R m =200~500nm. The specific surface area of the catalyst particles is 73m 2 / g.

[0039] Example 2:

[0040] The preparation method of the porous walnut-shaped catalyst particles in this embodiment is as follows: first, 0.2g of polyvinyl pyrrolidone and 0.6g of bismuth sulfide are dissolved in deionized water; then, 0.1M copper nitrate solution is slowly added to the deionized water; finally, the mixture is reacted at 120°C for 12 hours, and the solid product is collected by centrifugation to obtain the target catalyst particles. The morphology of the porous walnut-shaped catalyst particles in this embodiment is shown in the electron micrograph. Figure 2 The specific parameters and dimensions are shown in Table 1. The catalyst particles are elliptical spherical walnut-shaped, separated by four inward concave arcs, and have a number of evenly distributed pore structures on the surface. The overall size is about 17μm, the radius of the elliptical spherical along the long axis is R1 = 8μm, and the radius along the short axis is R2 = 7μm; the number of inward concave arcs n = 4, and the radius of the inward concave arc R L = 6 μm, the angle between the two arc tops is θ = 90°; the radius of the surface pores R m=200~400nm. The specific surface area of the catalyst particles is 65m 2 / g.

[0041] Example 3:

[0042] The preparation method of the porous walnut-shaped catalyst particles in this embodiment is as follows: first, 0.2g of polyvinyl pyrrolidone and 0.8g of sodium bismuthate are dissolved in deionized water; then, 0.1M copper sulfate solution is slowly added to the deionized water; finally, the mixture is reacted at 150°C for 10 hours, and the solid product is collected by centrifugation and washing to obtain the target catalyst particles. The local surface structure of the porous walnut-shaped catalyst particles in this embodiment is shown in the electron microscope image. Figure 3 The specific parameters and dimensions are shown in Table 1. The catalyst particles are elliptical spherical walnut-shaped, separated by four inward concave arcs, and have a number of evenly distributed pore structures on the surface. The overall size is about 20μm, the radius of the elliptical spherical along the long axis is R1 = 10μm, and the radius along the short axis is R2 = 8.5μm; the number of inward concave arcs n = 4, and the radius of the inward concave arc R L = 8 μm, the angle between the two arc tops is θ = 90°; the radius of the surface pores R m =300~400nm. The specific surface area of the catalyst particles is 62m 2 / g.

[0043] Table 1

[0044]

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A porous walnut-shaped catalyst particle, characterized in that: The catalyst particles are ellipsoidal in shape as a whole; the walnut shape is divided into four equal parts by inwardly concave grooves; and the outer surface of the catalyst particles includes a plurality of pore structures.

2. The porous walnut-shaped catalyst particle according to claim 1, characterized in that: The radius R1 of the catalyst particle along the long axis is 6 to 10 μm, and the radius R2 along the short axis is 5 to 8 μm.

3. The porous walnut-shaped catalyst particle according to claim 1, characterized in that: The radius R of the inwardly concave groove arc L =4~6μm, the number of inward arc-shaped protrusions n=4.

4. The porous walnut-shaped catalyst particle according to claim 1, characterized in that: The radius R of the pores on the surface of the catalyst particles m =150~500 nm.

5. The porous walnut-shaped catalyst particle according to any one of claims 2 to 4, characterized in that: The arc length of the arc of the ellipse is L1, where 0<L1<πR1.

6. The porous walnut-shaped catalyst particle according to any one of claims 2 to 4, characterized in that: The arc length of the inwardly recessed groove is L2, wherein 0<L2<πR2.

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