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Catalyst by taking modified alumina as carrier and preparation method thereof

A kind of alumina and catalyst technology, applied in the field of catalyst and preparation with modified alumina as the carrier, can solve the problems of reduced reaction activity and stability, reduced pore volume, and reduced specific surface area of ​​the carrier, so as to improve the degree of dispersion and reduce the The effect of increasing the degree, increasing the effective load, improving the activity and stability of the catalyst

Inactive Publication Date: 2015-08-05
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under certain reaction conditions, the active metal and the alumina support will interact to form aluminate that is not easy to reduce, resulting in a decrease in the specific surface area of ​​the support, a decrease in pore volume, and a smaller pore channel, which will also lead to a decrease in the content of effective active metal components. , and directly lead to the decrease of reactivity and stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take the Fischer-Tropsch synthesis catalyst prepared with cobalt supported on modified alumina as an example.

[0020] According to the composition of modified alumina, weigh a certain amount of Ni(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O and citric acid were dissolved in distilled water, and the mixed solution was stirred and evaporated to a certain volume in a water bath at 85°C, and then the equal volume was impregnated in a certain amount of alumina (self-made activated alumina, 1mol / L aluminum nitrate and 1mol / L ammonia water co-precipitated , precipitation temperature 50°C, aging temperature 70°C, aging time 2h, drying at 110°C for 12h, calcination at 500°C for 4h, the specific surface area is 270m 2 g -1 , pore volume 0.7cm 3 g -1 , with an average pore diameter of 14nm), to obtain a carrier precursor, in which the molar composition ratio of Ni 2+ :Al 3+ : Citric acid: Al 2 o 3 =1:2:0.5:5; After drying the carrier precursor at 100°C for 15h, transfer it t...

Embodiment 2

[0024] Take the methanation catalyst supported by nickel on modified alumina as an example.

[0025] According to the composition of modified alumina, weigh a certain amount of Co(NO 3 ) 2 ·6H 2 O, Al 2 ·(SO 4 ) 3 18H 2 O and aspartic acid were dissolved in distilled water, and the mixed solution was stirred and evaporated to a certain volume in a water bath at 90°C, and then the equal volume was impregnated in a certain amount of alumina (Shandong Aluminum, activated alumina, with a specific surface area of ​​350m 2 g -1 , pore volume 0.6cm 3 g -1 , with an average pore size of 15nm), to obtain a carrier precursor, in which the molar composition ratio Co 2+ :Al 3+ : Aspartic acid: Al 2 o 3 =1:2:1:20; the carrier precursor was dried at 150°C for 6h, transferred to a muffle furnace, and calcined at 700°C for 8h to obtain modified alumina CoAl 2 o 4 -Al 2 o 3 .

[0026] According to NiO accounts for 15 (wt.)% of the final catalyst, weigh Ni(NO 3 ) 2 ·6H 2 O, ...

Embodiment 3

[0028]Take the benzyl alcohol oxidation reaction of gold supported on modified alumina as an example.

[0029] According to the composition of modified alumina, weigh a certain amount of Mg(NO 3 ) 2 ·6H 2 O, Al(NO 3 ) 3 9H 2 O, citric acid are miscible in distilled water, after the mixed solution is stirred and evaporated to a certain volume in a 60°C water bath, the equal volume is impregnated in a certain amount of alumina (Sasol company, activated alumina, the specific surface area is 500m 2 g -1 , pore volume 1.1cm 3 g -1 , average pore diameter 6nm), obtain the carrier precursor, wherein the molar composition ratio Mg 2+ :Al 3+ : Citric acid: Al 2 o 3 =1:2:1.5:50; the carrier precursor was dried at 110°C for 12h, transferred to a muffle furnace, and calcined at 800°C for 4h to obtain modified alumina MgAl 2 o 4 -Al 2 o 3 .

[0030] Press Au 2 o 3 Accounting for 2.0(wt.)% of the final catalyst, weigh Au(OAc) 2 , prepare the solution, impregnate the above...

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Abstract

The invention relates to a catalyst by taking modified alumina as a carrier and a preparation method thereof. The catalyst by taking modified alumina as the carrier is composed of active metal oxide and modified alumina, wherein the mol ratio of auxiliary agent metal aluminate to alumina in the modified alumina is 1: 5-75, and the active metal oxide accounts for 2.0-30% of final catalyst by weight composition. The catalyst has the advantages of good activity, good stability and long service life used for a ft synthesis reaction.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst with modified alumina as a carrier and a preparation method thereof. Background technique [0002] The impregnation method is a frequently used catalyst preparation method. The specific surface area, acidity and alkalinity, pore structure, strength, and the interaction between the support and the metal of the support used for impregnation are important factors affecting the activity and stability of the catalyst. SiO 2 、Al 2 o 3 、TiO 2 , ZrO 2 , Molecular sieve and activated carbon can be used as catalyst carrier. Among them, Al 2 o 3 With larger pores and higher specific surface area, it can effectively solve the diffusion of heavy components in the reaction product in the pores of the catalyst, and can effectively prevent the degradation or deactivation of catalyst activity caused by carbon deposition. In addition, Al 2 o 3 It has high temperature resistance, inertness, high h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/75B01J23/52B01J23/80C10G2/00
Inventor 李德宝刘岩贾丽涛侯博肖勇陈从标
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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