Naphtha reforming catalyst and method for preparing same

Abstract

The invention provides a naphtha reforming catalyst. The naphtha reforming catalyst comprises a TiO2-Al2O3 compound carrier and the following active component based on the mass of the carrier: 0.01 to 2.0 percent of platinum metals, 0.05 to 2.0 percent of VIIB metals, and 0.1 to 5.0 percent of halogens; the titanium oxide content of the TiO2-Al2O3 compound carrier is 3 to 50 percent; and the TiO2is highly dispersed in the Al2O3. The catalyst carrier is prepared by a co-precipitation method, and a dispersing agent is added in a preparation process, so that the TiO2 is highly dispersed in the Al2O3, and the catalyst improves arene yield and increases activity stability.

Description

technical field

[0001] The invention is a naphtha reforming catalyst and a preparation method thereof, in particular, a carrier containing TiO 2 Naphtha reforming catalyst and preparation method thereof. Background technique

[0002] Catalytic reforming is an important process for the production of high-octane gasoline components and aromatics from naphtha fractions, while producing cheap hydrogen as a by-product. In recent years, with the increasing social demand for reformed products, the production capacity of catalytic reforming units in the world has increased year by year, among which semi-regenerative reforming units still occupy a dominant position. Production has been widely used.

[0003] In the early stage of the development of semi-regenerative reforming catalysts, η-Al has been selected 2 o 3 As a catalyst carrier, because this carrier has strong acidity and poor thermal stability, especially when it is operated under high-severity conditions, it will deacti...

Examples

preparation example Construction

[0027] The preparation method of catalyst provided by the invention comprises the steps:

[0028] (1) Dissolve aluminum alkoxide in alcohol solvent, add organotitanium compound and dispersant, mix well, add water, stir to obtain a colloidal solution, filter the colloidal solution, wash the filter cake with water until the lotion is neutral, TiO after drying 2 -Al 2 o 3 composite oxide,

[0029] (2) Dry and roast the composite oxide obtained in step (1) to obtain TiO 2 -Al 2 o 3 Composite carrier,

[0030] (3) The catalyst active component is introduced into the composite carrier by impregnation method, then dried and calcined.

[0031] Above-mentioned method (1) step is TiO 2 -Al 2 o 3 The preparation of composite oxides uses aluminum alkoxide and organic titanium compound as raw materials, the aluminum alkoxide is preferably aluminum triisopropoxide, the organic titanium compound is preferably titanium alkoxide, titanium hydroxydilactate , isopropyl triisostearyl t...

example 1

[0050] Preparation of strip-shaped TiO by the method of the present invention 2 -Al 2 o 3 Composite carrier

[0051] Add 100 mL of isopropanol to 100 g (0.49 mol) of aluminum triisopropoxide, heat to 80° C. and reflux for 6 hours to completely dissolve the aluminum triisopropoxide. The solution was cooled to 25°C for 12 hours. Add 5 grams (0.018 mol) of titanium tetraisopropoxide and 5 grams (0.026 mol) of citric acid into the above solution, mix well and stir evenly. Add 150 mL of deionized water to the above solution, and vigorously stir at 25 °C to obtain a colloidal solution. The colloidal solution was filtered to remove water, and the obtained colloidal substance was washed with water until the washing liquid was neutral. The jelly obtained after washing with water was dried under reduced pressure at 40°C for 12 hours, and dried at 120°C for 12 hours to obtain TiO 2 -Al 2 o 3 Powder. Will get TiO 2 -Al 2 o 3 The powder is kneaded evenly according to the mass r...

example 2

[0053] Add 20 mL of absolute ethanol to 100 g (0.49 mol) of aluminum triisopropoxide, heat to 70° C. and reflux for 6 hours to completely dissolve the aluminum triisopropoxide. The solution was cooled to 25°C for 12 hours. Add 10 grams (0.029 mol) of tetra-n-butoxytitanium, 2 mL (0.035 mol) of acetic acid and 1 gram (0.005 mol) of dodecylamine into the above solution, mix well and stir evenly. Add 50 mL of deionized water to the above solution and stir vigorously at 40 °C to obtain a colloidal solution. This colloidal solution is filtered, washed with water until the washing liquid is neutral, then dried according to the method of Example 1 and extruded into strips, dried and roasted to obtain strip-shaped TiO 2 -Al 2 o 3 Carrier CS-2, its TiO 2 The content is 10% by mass, the physical properties are shown in Table 2, and the XRD spectrum is shown in figure 1 .

technical field

[0001] The invention is a naphtha reforming catalyst and a preparation method thereof, in particular, a carrier containing TiO 2 Naphtha reforming catalyst and preparation method thereof. Background technique

[0002] Catalytic reforming is an important process for the production of high-octane gasoline components and aromatics from naphtha fractions, while producing cheap hydrogen as a by-product. In recent years, with the increasing social demand for reformed products, the production capacity of catalytic reforming units in the world has increased year by year, among which semi-regenerative reforming units still occupy a dominant position. Production has been widely used.

[0003] In the early stage of the development of semi-regenerative reforming catalysts, η-Al has been selected 2 o 3 As a catalyst carrier, because this carrier has strong acidity and poor thermal stability, especially when it is operated under high-severity conditions, it will deacti...

Examples

preparation example Construction

[0027] The preparation method of catalyst provided by the invention comprises the steps:

[0028] (1) Dissolve aluminum alkoxide in alcohol solvent, add organotitanium compound and dispersant, mix well, add water, stir to obtain a colloidal solution, filter the colloidal solution, wash the filter cake with water until the lotion is neutral, TiO after drying 2 -Al 2 o 3 composite oxide,

[0029] (2) Dry and roast the composite oxide obtained in step (1) to obtain TiO 2 -Al 2 o 3 Composite carrier,

[0030] (3) The catalyst active component is introduced into the composite carrier by impregnation method, then dried and calcined.

[0031] Above-mentioned method (1) step is TiO 2 -Al 2 o 3 The preparation of composite oxides uses aluminum alkoxide and organic titanium compound as raw materials, the aluminum alkoxide is preferably aluminum triisopropoxide, the organic titanium compound is preferably titanium alkoxide, titanium hydroxydilactate , isopropyl triisostearyl t...

example 1

[0050] Preparation of strip-shaped TiO by the method of the present invention 2 -Al 2 o 3 Composite carrier

[0051] Add 100 mL of isopropanol to 100 g (0.49 mol) of aluminum triisopropoxide, heat to 80° C. and reflux for 6 hours to completely dissolve the aluminum triisopropoxide. The solution was cooled to 25°C for 12 hours. Add 5 grams (0.018 mol) of titanium tetraisopropoxide and 5 grams (0.026 mol) of citric acid into the above solution, mix well and stir evenly. Add 150 mL of deionized water to the above solution, and vigorously stir at 25 °C to obtain a colloidal solution. The colloidal solution was filtered to remove water, and the obtained colloidal substance was washed with water until the washing liquid was neutral. The jelly obtained after washing with water was dried under reduced pressure at 40°C for 12 hours, and dried at 120°C for 12 hours to obtain TiO 2 -Al 2 o 3 Powder. Will get TiO 2 -Al 2 o 3 The powder is kneaded evenly according to the mass r...

example 2

[0053] Add 20 mL of absolute ethanol to 100 g (0.49 mol) of aluminum triisopropoxide, heat to 70° C. and reflux for 6 hours to completely dissolve the aluminum triisopropoxide. The solution was cooled to 25°C for 12 hours. Add 10 grams (0.029 mol) of tetra-n-butoxytitanium, 2 mL (0.035 mol) of acetic acid and 1 gram (0.005 mol) of dodecylamine into the above solution, mix well and stir evenly. Add 50 mL of deionized water to the above solution and stir vigorously at 40 °C to obtain a colloidal solution. This colloidal solution is filtered, washed with water until the washing liquid is neutral, then dried according to the method of Example 1 and extruded into strips, dried and roasted to obtain strip-shaped TiO 2 -Al 2 o 3 Carrier CS-2, its TiO 2 The content is 10% by mass, the physical properties are shown in Table 2, and the XRD spectrum is shown in figure 1 .

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