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Catalyst for producing low-carbon olefins through efficient conversion of CO2

A low-carbon olefin and catalyst technology, which is applied in the field of catalysts for the efficient conversion of CO2 to low-carbon olefins, can solve the problems of high catalyst preparation cost, reduced selectivity of low-carbon olefins, low low-carbon olefins, etc.

Active Publication Date: 2015-03-25
NINGXIA UNIVERSITY
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  • Claims
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Problems solved by technology

Literature [5] adopts Fe 3 (CO) 12 homogeneous catalyst, CO 2 The conversion rate is 43.5%, and the selectivity of low-carbon olefins reaches 98.4%, but the catalyst preparation cost is high, and the storage and preparation conditions are harsh
Literature [6-13] reported the effect of adding additives on Fe-based catalysts. 2 The conversion rate is 24.27-53.01%, and the selectivity of low-carbon olefins is 5.3-40.46%, but still, as the conversion rate increases, the selectivity of low-carbon olefins decreases
Overall, the yield of low-carbon olefins reported in current research is still low, around 18%.

Method used

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  • Catalyst for producing low-carbon olefins through efficient conversion of CO2

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preparation example Construction

[0030] The preparation method of the catalyst provided by the present invention is mainly divided into two types: precipitation method and mechanical mixing method. Methods such as impregnation modification of alkali metals, alkaline earth metals and active Fe components are not excluded. The prepared catalyst precursor needs to be prepared before the reaction. Reduction, passivation and activation steps.

[0031] The structural formula of the catalyst of the present invention can be expressed as A-(B(C x Fe y )O z )-Fe / S, wherein x+y=2, z=3.2-4.2. A is an alkali metal or alkaline earth metal element (Na, K, Rb, Cs, Mg, Ca, Sr, Ba), B is a divalent ion of a transition metal element (Cr, Fe, Ni, Co, Cu, Zn, etc.), C is a trivalent ion of a transition metal element (Cr, Fe, Co, etc.); S is a carrier, and an oxide (Al 2 o 3 , SiO 2 , ZrO 2 etc.) or molecular sieves (Silicalite-1, ZSM-5, β molecular sieves, etc.). Catalysts for CO 2 Hydrogenation reaction to obtain linear...

Embodiment 1

[0053] Catalysts were prepared according to method one.

[0054] (1) Weigh 17.90g ZrO 2 solid, added to 100mL containing 0.22mol / L Fe(NO 3 ) 3 And 0.045mol / L KNO 3 solution, stir well and set aside.

[0055] (2) Weigh 1.44g FeSO 4 ·7H 2 O and 1.02g Fe(NO 3 ) 3 ·6H 2O, add it into 100mL water and stir well, raise the temperature to 358K under the protection of nitrogen, then slowly add 0.1mol / L NaOH solution for precipitation, after sufficient precipitation, cool down to room temperature, and pass in pure air for aging for 12h. Then add the suspension prepared in step (1), stir well, then dry the obtained suspension at 353K until there is no obvious moisture, further dry at 393K for 12h under nitrogen atmosphere, and then calcinate at 773K for 5h.

[0056] (3) The catalyst sample obtained in step (2) is compressed at 20 MPa, sieves 20 to 40 mesh particles, weighs 10.0 g, and reduces 5 h at 673 K with a hydrogen stream (nitrogen containing 5% hydrogen). After reaching ...

Embodiment 2

[0058] Weigh 38.84g ZrO(NO 3 ) 2 2H 2 O, added to 100mL containing 0.22mol / L Fe(NO 3 ) 3 And 0.045mol / L KNO 3 solution, stir well and set aside. Subsequent steps are the same as in Example 1, and the catalyst obtained is denoted as CAT2.

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Abstract

The invention relates to a catalyst for producing low-carbon olefins through efficient conversion of CO2, and a preparation method the catalyst. The catalyst is characterized in that the structural formula of the catalyst is A-(B(C<x>Fe<y>)O<z>)-Fe / S, wherein x plus y is equal to 2, z is equal to 3.2-4.2, A is alkali metal or alkaline-earth metal element, B is divalent ions of a transition metal element, C is trivalent ion of the transition metal element, S is a carrier, and A-(B(C<x>Fe<y>)O<z>)-Fe is an active constituent. The invention provides a Fe-based catalyst for producing olefins through efficient conversion of CO2, as well as a preparation method of the catalyst, aiming at the problem that the yield of low-carbon olefins prepared by current CO2 hydrogenation reaction is low. A main product obtained when the catalyst is used for CO2 hydrogenation reaction is low-carbon olefins (propylene, ethylene and butene). The conversion rate of CO2 achieves more than 60%, the selectivity of the low-carbon olefins achieves more than 60%, and the catalyst has the characteristics of being simple in the preparation method, low in cost, and high-efficiency in catalysis performance.

Description

technical field [0001] The present invention relates to a CO 2 A catalyst for efficiently converting light olefins and a preparation method thereof. Background technique [0002] The final form of fossil energy is CO 2 , which is the main greenhouse gas component responsible for global warming, CO 2 A large amount of emissions will seriously threaten human security. The current annual global CO emissions 2 more than 34.5 billion tons, since 2006 my country's CO 2 The total emission has been ranked first in the world, and in 2012 my country's CO 2 The total emission has reached 9.1 billion tons, and it is predicted from the emission trend that more than 77 million tons will be emitted in 2015, which is a very rapid growth and urgently needs to be cured. However, from a resource perspective, CO 2 It is an economical, safe and renewable carbon resource, which can be recycled as a carbon resource and converted into an important chemical product - low-carbon olefins, which...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J29/46B01J29/035B01J23/86C07C1/12C07C11/04C07C11/06C07C11/08
CPCY02P20/52
Inventor 范素兵吕俊敏张建利赵天生
Owner NINGXIA UNIVERSITY
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