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Rare-earth-containing composite solid super acidic catalyst and its preparing method

A solid super acid and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Reduce the activity and other problems, to achieve the effect of high content, increased roasting temperature, and low water content

Inactive Publication Date: 2007-03-28
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high catalyst calcination temperature will cause catalyst crystallization and reduce SO 4 2- The specific surface area bound to the catalyst
High calcination temperature can also cause SO 4 2- The decomposition of the catalyst reduces the activity of the
In addition, solid superacids are easy to absorb water, and the activity of solid superacids will also decrease after absorbing water.

Method used

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  • Rare-earth-containing composite solid super acidic catalyst and its preparing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under the condition of ice-water bath, the concentration of 1wt% TiCl 4The aqueous solution and the zirconium oxychloride aqueous solution with a concentration of 1 wt% are mixed according to a ratio of 1:1, and ethanol is added as a dispersant, and the volume ratio of the mixed liquid to ethanol is 1:5. Use ammonia water to adjust the pH value of the solution to the range of 9-10, and stir when adding the ammonia water to form zirconium hydroxide and titanium hydroxide precipitates. Then add 0.1-1mol / L nitric acid solution to the precipitate to generate zirconium hydroxide and titanium hydroxide sol, and the mass ratio of the precipitate to the nitric acid solution is 1:0.5-1.5. The sol is filtered and cleaned until the filtrate pH is 7 and Cl-free - , and then dried to obtain a mixed precursor oxide. The mixture of mixed precursor oxide and aluminum fluoride powder was ground to 3 ) 3 The aqueous solution is added to a concentration of 0.1mol / L dilute sulfuric acid...

Embodiment 2

[0025] Catalyst is prepared by the method of embodiment 1, difference is that in the mixture AlF 3 The content is 3wt%, and the calcination temperature of the catalyst is 700°C. The properties and product yields of the resulting catalysts are shown in Table 2.

[0026] Table 2

[0027] acid strength

Embodiment 3

[0029] Catalyst is prepared by the method of embodiment 1, difference is that in the mixture AlF 3 The content is 5wt%, and the calcination temperature of the catalyst is 700°C. The properties and product yields of the resulting catalysts are shown in Table 3.

[0030] table 3

[0031] acid strength

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Abstract

The present invention discloses a composite type solid super acidic catalyst containing rare earth. It is formed from ZrO2 carrier containing sulfuric acid radical ion, TiO2 carrier, rare earth metal oxide and halide of aluminium, in which the content of sulfuric acid radical ion is 10-20%, halide content of aluminium is 1-5%, water content in the catalyst is 0-1%, ZrO2 carrier content is 43-80% TiO2 carrier content is 43-80%, rare earth metal oxide content is 3-10% and the specific surface area of said catalyst is 100-300 sq.m / g. The halide of aluminium is selected from aluminium fluoride or aluminium chloride or mixture of both them, and the described rare earth metal oxide is one of lanthanum oxide or cerium oxide or samarium oxide or mixture of their two kinds.

Description

technical field [0001] The present invention relates to a kind of solid superacid catalyst and preparation method thereof, more specifically relate to a kind of modified ZrO containing sulfate ion 2 Supported solid superacid catalyst and its preparation method. Background technique [0002] A solid superacid is a solid acid with a stronger acidity than 100% sulfuric acid, expressed by the Hammett acidity function, the H of 100% sulfuric acid 0 =-11.93, while the H of the solid superacid 0 <-11.93. Compared with traditional catalysts, solid superacids have the following characteristics: (1) high catalytic efficiency, less dosage, less side reactions, and less by-products; (2) can be used at high temperatures, reusable, and the separation of catalysts and products is simple ; (3) non-corrosive, not polluting the environment; (4) the preparation method is simple and can be prepared by general metal salts. Due to the above advantages, the research and application of solid...

Claims

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Application Information

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IPC IPC(8): B01J27/125B01J27/053B01J23/10B01J21/06
Inventor 房永征金鸣林杨俊和张琢
Owner SHANGHAI INST OF TECH
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