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Catalyst for preparing acetaldehyde by ethane selective oxidation and preparation method thereof

A technology for selective oxidation and catalysts, which is applied in the preparation of carbonyl compounds by oxidation, catalysts for physical/chemical processes, molecular sieve catalysts, etc. It can solve the problems of remote possibility of industrialization and difficulty of acetaldehyde yield exceeding 5%.

Inactive Publication Date: 2011-07-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although some progress has been made in the preparation of acetaldehyde by the selective oxidation of ethane, the yield of acetaldehyde is difficult to exceed 5%, so the reaction is still in the field of basic theoretical research, and the possibility of industrialization is still far away

Method used

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  • Catalyst for preparing acetaldehyde by ethane selective oxidation and preparation method thereof
  • Catalyst for preparing acetaldehyde by ethane selective oxidation and preparation method thereof
  • Catalyst for preparing acetaldehyde by ethane selective oxidation and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0037] What this embodiment provides is the Mo-SBA-15 molecular sieve synthesized under the condition of different pH values ​​and the same molar ratio of Mo and Si, and its preparation method comprises the following steps

[0038] Dissolve 8 g of triblock copolymer P123 in 240.0 g of hydrochloric acid with a concentration of 2.0 mol / L, and stir in a constant temperature water bath at 40°C for 40 min until the foam on the surface disappears to form a homogeneous solution A; Parts of homogeneous solution A;

[0039] To 0.1635g (NH 4 ) 6 Mo 7 o 24 4H 2 Add 60mL of deionized water to O, stir at room temperature to form a homogeneous solution B; prepare five parts of homogeneous solution B by the same operation;

[0040] Mix five parts of homogeneous solution A with five parts of homogeneous solution B respectively, stir in a constant temperature water bath at 40°C for 4 hours, then slowly drop in 17g of TEOS, and continue stirring for 2 hours to obtain five parts of the mixt...

Embodiment 2

[0046] What this embodiment provides is the Mo-SBA-15 molecular sieve synthesized under the condition of the same pH value and different molar ratios of Mo and Si. Its preparation method is basically the same as that of Example 1, except that the corresponding pH value is only adjusted to 3. Add (NH 4 ) 6 Mo 7 o 24 4H 2 For O and TEOS, the molar ratios of Mo / Si based on the conversion of the addition amount of the two are 0.1:100, 2.5:100, 5:100, 8:100, 10:100, 12:100, 15:100 ) to obtain a molecular sieve doped with molybdenum in the framework, namely Mo-SBA-15 molecular sieve.

Embodiment 3

[0048] What the present invention provides is the K / Mo-SBA-15 catalyst prepared under the condition of different K, Mo, Si molar ratio, and its preparation method comprises the following steps:

[0049] Weigh 0.04g of potassium nitrate, add 15g of deionized water, stir until completely dissolved, and obtain potassium nitrate solution;

[0050] Weigh 5g of the Mo-SBA-15 molecular sieve prepared in Example 2, add it to the potassium nitrate solution, stir it rapidly, and ultrasonically shake it at 20°C for 30min, then dry the obtained product at 100°C for 6h, and then dry it at 550°C It was calcined at ℃ for 4 hours, and the heating rate was 2 ℃ / min to obtain catalyst powder, that is, K / Mo-SBA-15 catalyst.

[0051] image 3 with Figure 4 The XRD spectra of the Mo-SBA-15 molecular sieve provided in Example 2 and the K / Mo-SBA-15 catalyst provided in Example 3 respectively. Among them, in image 3 Among them, the spectral line (a) represents the pure SBA-15 molecular sieve, an...

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Abstract

The invention relates to a catalyst for preparing acetaldehyde by ethane selective oxidation and a preparation method thereof. The catalyst for preparing the acetaldehyde by ethane selective oxidation is a doped catalyst using an SBA-15 molecular sieve as a carrier, using an oxide of transition molybdenum metal as an active ingredient and using an oxide of alkali metal potassium as an auxiliary agent, wherein a part of molybdenum oxide is supported on the surface of the SBA-15 molecular sieve, and the other part of molybdenum oxide is doped into the skeleton of the SBA-15 molecular sieve; thepotassium oxide is supported on the surface of the SBA-15 molecular sieve; and the raw material mole ratio of K, Mo to Si is 0.5:10: 100. The invention also provides the preparation method for the catalyst. The catalyst, the molybdenum of which is doped into the SBA-15 molecular sieve carrier skeleton and the potassium auxiliary agent of which is supported on the surface of the carrier in a high dispersion form, has high reaction activity and selectivity; and when the catalyst is used for preparing the acetaldehyde by ethane selective oxidation, the yield of the acetaldehyde can reach 10.2 percent.

Description

technical field [0001] The invention relates to a catalyst for the selective oxidation of ethane to produce acetaldehyde and a preparation method thereof, belonging to the technical field of petrochemical catalysis. Background technique [0002] The selective oxidation of low-carbon alkanes is one of the most challenging topics in the world of catalytic research. It not only has great significance for basic theoretical research on the activation and directional selective oxidation of alkanes, but also in the field of petrochemicals, natural gas partially replaces petroleum as a new type of chemical raw material. The realization of the chemical production route has broad practical prospects and huge economic benefits. Among low-carbon alkanes, the stability of ethane molecules is second only to methane. In the process of direct catalytic conversion of ethane, it is necessary to use highly active catalysts and activate ethane molecules under relatively harsh reaction condition...

Claims

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Application Information

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IPC IPC(8): B01J29/78C07C47/07C07C45/28
Inventor 赵震刘坚于利红蒋志强王超段爱军姜桂元
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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