Iso-butane dehydrogenation catalyst and preparation method thereof

A technology of dehydrogenation catalyst and isobutane, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of low conversion rate of low-carbon alkanes, etc. Achieve the effects of reducing surface acidity, improving dispersion ability, and reducing surface carbon

Inactive Publication Date: 2012-08-01
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

According to literature reports, Chen Guifang published "V 2 o 5 / Al 2 o 3 Research on the dehydrogenation reaction of isobutane”, which studies the supported V 2 o 5 / Al 2 o 3 Catalyst is to the performance of isobutane dehydrogenation, but the result shows that reaction is carried out under lower reaction temperature, and low-carbon alkane conversion rate is lower, proves that its conversion rate to isobutane is only about 30% according to the inventor's test

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0020] The preparation method of described isobutane dehydrogenation catalyst is as follows:

[0021] (1), the nano-Al 2 o 3 Granular tableting and sieving, select 2-4 grams of 40-60 mesh Al after sieving 2 o 3 particles, and bake them at 400-600°C for 0.5-12 hours to obtain nano-Al 2 o 3 carrier;

[0022] (2), the nano-Al obtained in the previous step 2 o 3 Carrier and 8.8-16.5 ml of NH with a mass concentration of 0.05 g / ml 4 VO 3 or HVO 3 solution, 2.8 to 7.8 milliliters of K, Na or Ca soluble salt solution with a mass concentration of 0.02 g / ml and 10 milliliters of nitrate or hydrochloride solution containing 0.01 gram of Ce or La are mixed uniformly to obtain mixture I, which is mixed with a weak base Adjust the pH value of the mixture I to 2-5 at a temperature of 10-80° C. to obtain the mixture II;

[0023] (3) After the above mixture II was left to stand at a temperature of 10-100°C for 0.5-8 hours, the catalyst sample was obtained by filtration, and then th...

Embodiment 1

[0028] Take a certain amount of particles with a size of 10 nanometers and a specific surface area of ​​150 meters 2 / g, nano-Al with a pore size of 29 nm 2 o 3 , press it into tablets and sieve it, and select 2 grams of sieved 40-60 mesh Al 2 o 3 Particles were calcined at 500°C for 5 hours to obtain nano-Al 2 o 3 Carrier; place the carrier in a beaker, add 8.8 milliliters of NH with a mass concentration of 0.05 g / ml 4 VO 3 solution, 2.8 ml of KNO with a mass concentration of 0.02 g / ml 3 solution and 10 ml of Ce(NO 3 ) 3 solution, mix the above mixture evenly to obtain mixture I, then adjust the pH value of mixture I to 3.5 with 2.5% ammonia water to obtain mixture II; then soak mixture II in a water bath at 80°C for 1 hour, and then filter to obtain a catalyst sample, Then the sample was dried in an oven at 120°C for 8 hours, and then put into a muffle furnace and calcined at 550°C for 4 hours to prepare the isobutane dehydrogenation catalyst.

[0029] Catalyst act...

Embodiment 2

[0031]Take a certain amount of particles with a size of 80 nanometers and a specific surface of 40 meters 2 / g, nano-Al with a pore size of 50 nm 2 o 3 , press it into tablets and sieve it, and select 2 grams of sieved 40-60 mesh Al 2 o 3 Particles were calcined at 400°C for 12 hours to obtain nano-Al 2 o 3 Carrier; place the carrier in a beaker, add 13.5 milliliters of HVO with a mass concentration of 0.05 g / ml 3 solution, 5.6 ml of NaNO with a mass concentration of 0.02 g / ml 3 solution and 10 ml of La(NO 3 ) 3 solution, mix the above mixture evenly to obtain mixture I, then adjust the pH value of mixture I to 5 with ammonium bicarbonate solution to obtain mixture II; then immerse mixture II in a water bath at 50°C for 0.5 hours, and then filter to obtain a catalyst sample, Then the sample was dried in an oven at 120°C for 8 hours, and then put into a muffle furnace and calcined at 300°C for 12 hours to prepare the isobutane dehydrogenation catalyst.

[0032] Catalys...

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Abstract

An iso-butane dehydrogenation catalyst and a preparation method thereof relate to catalytic agents and preparation methods of the catalytic agents in chemical reactions. The catalyst comprises, by weight, 1-30% of vanadic oxide, 0.2-5% of alkali metal oxide, 0.1-10% of Ce containing rare earth elements or La oxide and 55-98.7% of nanometer Al2O3. The preparation method is first preparing an Al2O3 carrier, then mixing the carrier with vandic salt solution, alkali metal solution, the Ce containing the rare earth elements or La salt solution, and then stewing and filtering to obtain a catalyst sample, roasting the catalyst sample for a certain time at certain temperature, and finally preparing the iso-butane dehydrogenation catalyst. The prepared iso-butane dehydrogenation catalyst improves conversion rate of iso-butane and achieves high olefin selectivity on the bases of the vanadic system catalyst at present.

Description

technical field [0001] The invention relates to a catalyst in a chemical reaction and a preparation method thereof, in particular to an isobutane dehydrogenation catalyst and a preparation method thereof. Background technique [0002] Among low-carbon olefins, isobutene is an important organic chemical raw material. It is used in the production of polyisobutylene (PB), methyl tert-butyl ether (MTBE), alkylation of low-carbon olefins, mixed low-carbon olefins, butyl rubber and organic glass. It is an important raw material for products, and its consumption is second only to ethylene and propylene. Isobutene is currently mainly passed through the catalytic cracking unit (FCC) of the refinery and the C cracking unit of the cracking ethylene unit of the petrochemical enterprise. 4 The distillate raffinate is obtained. Almost all the isobutene resources in my country come from the FCC unit and steam cracking unit of the refinery, but the yield is only 6~7% and 2~5%, which greatl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22C07C11/09C07C5/333
Inventor 徐锐姚大虎王晓吴峰敏刘翠云许爱荣杜西刚
Owner HENAN UNIV OF SCI & TECH
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