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Preparation method of mo/molecular sieve supported catalyst

A supported catalyst and molecular sieve technology, applied in the field of catalysis, can solve the problems of poor stability, low yield of total aromatics, low benzene selectivity, etc., and achieve the effects of easy scale-up, improved methane conversion rate, and simple operation

Active Publication Date: 2016-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problems of low benzene selectivity, poor stability and low yield of total aromatics existing in the prior art, and a preparation method of Mo / molecular sieve supported catalyst is provided

Method used

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  • Preparation method of mo/molecular sieve supported catalyst
  • Preparation method of mo/molecular sieve supported catalyst
  • Preparation method of mo/molecular sieve supported catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] HZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 50) As the Mo species organic precursor and carrier of the Mo / zeolite-supported catalyst, the Mo / HZSM-5 catalyst of Example 1 was prepared, wherein the weight percentage of Mo was 4%. The preparation method and reaction evaluation steps of the catalyst are as follows:

[0020] 1) The catalyst preparation method of embodiment 1:

[0021] (a) Molecular sieve carrier organic solvent pretreatment: 20 g SiO 2 / Al 2 o 3 HZSM-5 molecular sieve with a molar ratio of 50 was stirred and mixed with 100 ml methanol to form a suspension, and 80 o After condensing and refluxing for 2 h under the condition of C, the solvent was removed by suction filtration and placed in a vacuum oven for 80 o C is vacuum-dried to obtain a molecular sieve carrier pretreated with an organic solvent;

[0022] (b) Preparation of Mo / molecular sieve supported catalyst by impregnation: Weigh 8.53 g molybdenum naphthenate with Mo content of 1...

Embodiment 2

[0032] SiO 2 / Al 2 o 3 The HZSM-5 molecular sieve with a molar ratio of 50 was used as the carrier without organic solvent pretreatment, and the Mo species organic precursor was directly supported to prepare the Mo / HZSM-5 catalyst, where the weight percentage of Mo was 4%. Than the preparation process and reaction evaluation of the Mo / HZSM-5 catalyst of embodiment 2:

[0033] 1) The catalyst preparation method of embodiment 2:

[0034] Weighed 8.53 g of molybdenum naphthenate with a Mo content of 1.0 wt.% as the organic precursor of Mo species, dissolved it in 20 ml of toluene to form a Mo-containing impregnation solution, and then directly added 2 g of SiO 2 / Al 2 o 3 HZSM-5 molecular sieve with a molar ratio of 50, ultrasonically dispersed for 5 min, 30 oC Under the conditions, rotate and stir at a rate of 300 rpm for 10 h, and distill off the solvent under reduced pressure, in an air atmosphere, with 5 o C / min heating rate from room temperature to 350 oC , after m...

Embodiment 3

[0048] HZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 25) As the Mo species organic precursor and carrier of the Mo / zeolite-supported catalyst, the Mo / HZSM-5 catalyst of Example 3 was prepared, wherein the weight percentage of Mo was 6%. The preparation method and reaction evaluation steps of the catalyst are as follows:

[0049] 1) The catalyst preparation method of embodiment 3:

[0050] (a) Molecular sieve carrier organic solvent pretreatment: 20 g SiO 2 / Al 2 o 3 HZSM-5 molecular sieve with a molar ratio of 25 was stirred and mixed with 100 ml acetone to form a suspension, 70 o After condensing and refluxing for 4 h under the condition of C, the solvent was removed by suction filtration and placed in a vacuum oven for 80 o C is vacuum-dried to obtain a molecular sieve carrier pretreated with an organic solvent;

[0051] (b) Preparation of Mo / molecular sieve supported catalyst by impregnation: Weigh 0.444 g molybdenum acetylacetonate as the organic precu...

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Abstract

The invention relates to a preparation method of a Mo / molecular sieve supported catalyst, which mainly solves the problems of low benzene selectivity, poor stability and low yield of total aromatics in the prior art. The preparation method of the present invention includes the following steps: (a) molecular sieve carrier organic solvent pretreatment: mixing and stirring the molecular sieve and organic solvent I to form a suspension, condensing and refluxing, removing the solvent by suction filtration and vacuum drying; (b) preparing Mo / Molecular sieve supported catalyst: dissolve the Mo species organic precursor in the organic solvent II to form a Mo-containing impregnating solution, then add the organic solvent obtained in step (a) to pretreat the molecular sieve carrier, ultrasonically disperse, rotate and stir, and distill off the solvent under reduced pressure , Roasting and decomposing Mo species organic precursors to obtain the technical solution of the required catalyst, which solves the above problems well, and the prepared catalyst can be used for methane oxygen-free dehydrogenation aromatization reaction.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of a Mo / molecular sieve supported catalyst. Background technique [0002] Methane anaerobic dehydroaromatization reaction is a reaction that directly converts methane with considerable reserves and high hydrogen-to-carbon ratio into benzene and hydrogen under anaerobic conditions. It is considered to be a process route for efficient utilization of natural gas resources. Effectively alleviate the current shortage of oil resources (Xu et al., J. Catal. ,2003, 216: 386; Ismagilov et al., Energy Environ. Sci. , 2008, 1: 526). Different from traditional oxidative natural gas conversion processes such as methane steam reforming and partial oxidation, the oxygen-free conversion process of natural gas using methane anaerobic dehydroaromatization reaction can avoid side reactions such as catalytic combustion and deep oxidation of methane. A lot of CO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48C07C15/04C07C15/02C07C2/76
CPCY02P20/52
Inventor 金中豪秦磊刘苏王仰东
Owner CHINA PETROLEUM & CHEM CORP
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