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Acrylic acid catalyst prepared by acrolein oxidation and preparation method thereof
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A catalyst and acrylic acid technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, carboxylate preparation, etc., can solve the problems of low reaction yield and low selectivity of acrylic acid catalysts , to achieve the effects of increased yield, increased selectivity, and improved reaction performance
Active Publication Date: 2014-05-28
CHINA PETROLEUM & CHEM CORP +1
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[0006] One of the technical problems to be solved by the present invention is that the reaction yield of acrylic acid catalysts in the prior art is not high and the selectivity is low, and a new catalyst for acrolein oxidation to acrylic acid is provided
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Embodiment 1
[0056] 100 g (NH 4 ) 6 Mo 7 o 24 4H 2 O was added to 100 grams of warm water at 70°C, stirred to dissolve it completely, and 53.9 grams of 40% (wt.) silica sol and 12.7 grams (NH 4 ) 6 h 5 [H 2 (WO 4 ) 6 ] to make material A.
[0057] 16.0 g of Cu(NO 3 ) 2 ·3H 2 O was added to 20 grams of hot water at 70°C, stirred and dissolved, and then 6.95 grams of Sb was added 2 o 3 , 3.1 g Nb 2 o 5 , 0.48 g KNO 3 Material B was made after stirring and dissolving.
[0058] Add 24.7 g NH to 100 g water 4 VO 3 Material C is formed.
[0059] Add materials B and C dropwise to material A successively under rapid stirring to form a catalyst slurry, add 8.0 g of ethylenediamine and stir and age at 60°C for 2 hours, dry the slurry at 120°C to remove most of the water, and then extrude out of shape, get The cylinder is then calcined at high temperature to obtain the finished catalyst, and the calcining temperature is 380°C.
[0060] Embodiments 2, 4, 5, 7 and 8 prepared cat...
Embodiment 3
[0062] 123.6 g (NH 4 ) 6 Mo 7 o 24 4H 2 O, 4.6 g MoO 3 , 38.4 g NH 4 VO 3 and 20.7 g (NH 4 ) 6 h 5 [H 2 (WO 4 ) 6 ] was added to 500 grams of deionized water, dissolved under heating and stirring, and this mixed salt solution was A.
[0063] 4.8 g of Sr(NO 3 ) 2 and 33.5 g Cu(NO 3 ) 2 ·3H 2 O was added to 50 grams of deionized water and dissolved under heating and stirring. This mixed salt solution was B.
[0064] The AB solution was mixed to form a co-precipitationslurry, and 8.0 g of ethylenediamine was added, evaporated to dryness under continuous heating and vigorous stirring to become a solid, and then crushed to form a powder C passing through a 60-mesh sieve.
[0065] Add 41 grams of powder C and 2.2 grams of TeO of 300 mesh into the mixer and mix well, forming The cylinder is then calcined at high temperature to obtain the finished catalyst, and the calcining temperature is 380°C.
[0066] Examples 6 and 9 prepared catalysts according to the steps...
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Abstract
The invention relates to an acrylic acid catalyst prepared by acrolein oxidation and a preparation method thereof, and mainly solves problems of low reaction yield and selectivity of a catalyst in a prior art. According to the invention, a carrier is at least one selected from SiO2, Al2O3 and TiO2; a catalyst contains an active component expressed by a following general formula: Mo12VaXbYcZdQeOx; X is at least one selected from W, Cr and Nb; Y is at least one selected from Cu, Fe, Ni, Co and Mn; Z is least one selected from Sb and Bi; Q is least one selected from Li, Na, K, Rb, Cs, Mg, Ca and Sr; an organic template like ethene diamine is added during a catalyst preparation process to guide catalyst pore structure. The above technical scheme well solves the problems and can be applied to industrial production of acrylic acid through acrolein oxidation.
Description
technical field [0001] The invention relates to a catalyst for producing acrylic acid by oxidation of acrolein and a preparation method thereof. Background technique [0002] The selective oxidation of olefins to prepare α, β unsaturated aldehydes and unsaturated acids is an important chemical process. The production of unsaturated carboxylic acids from unsaturated aldehydes uses a catalyst containing Mo and V as active components. The improvement of the catalyst is mainly carried out from the aspects of the activity, selectivity and stability of the catalyst, such as adding transition metals to the active component to improve the activity and increase the yield of the product; adding rare earth elements to improve the oxidation-reduction ability and improve the stability of the catalyst ; Add Fe, Co, Ni and other elements to inhibit the sublimation of Mo, stabilize the active components of the catalyst, and improve the service life of the catalyst. [0003] There have been...
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