Molecular sieve catalyst, preparing method and use thereof

A molecular sieve and catalyst technology, applied in the field of modified molecular sieve catalyst, can solve the problems of reducing the economic benefit of aromatization, and achieve the effect of high reaction stability

Inactive Publication Date: 2007-07-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Although the activity of the above low-carbon hydrocarbon aromatization catalysts has been greatly improved, since the reaction is carried out at high temperature, a large amount of methane and ethane are inevitably produced, which reduces the economic benefits of aromatization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of common catalysts:

[0031] 1) Na-type ZSM-5 molecular sieve (silicon-aluminum ratio is 55) and 30%wt SB powder (that is, styrene-butadiene, imported from Germany) after roasting are extruded, dried, roasted, and then The H-type molecular sieve catalyst used is obtained by ammonia exchange and roasting, and the catalyst is crushed into 20-40 mesh particles before loading into the reactor, which is recorded as P.

[0032] 2) Place 5 g of the catalyst obtained in Step 1 in a continuous-flow fixed-bed reactor with an inner diameter of 10 mm. -1 The catalyst was contacted under the condition of weight space velocity, and the reaction results are shown in Table 1.

[0033] Prepare catalyst of the present invention:

[0034] Put 20 g of the calcined Na-type ZSM-5 molecular sieve (the ratio of silicon to aluminum is 55) into 1000 ml of 0.2 M NaOH solution, stir at 80 °C for 6 hours, cool to room temperature, then filter, wash until neutral, and dry Finally, it...

example 2

[0040] The above catalysts P and AT were respectively subjected to steam treatment, the steam treatment temperature was 530° C., and the treatment time was 3 hours. The obtained catalysts were respectively marked as P-530 and AT-530. Except that the reaction temperature was increased to 365° C., other reaction conditions were the same as in Example 1, and the reaction results are shown in Table 2.

[0041] Cumulative response

[0042] It can be seen from Table 2 that after high-temperature hydrothermal treatment of catalysts P and AT, the modified catalyst AT-530 of the present invention shows better aromatization stability than P-530, and the amount of carbon deposited on the catalyst is still almost equal .

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PUM

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Abstract

A modified molecular sieve catalysts used for olefin aromatization reaction, make up of molecular sieve and adhesive, the adhesive weight is 20 ~ 80% of the catalyst weight. The molecular sieve park in the alkaline solution that the concentration of 0.01 - 5M at room temperature to 100 Deg C for 0.1-50 hours; After washing, drying, and extrusion molding with the adhesive, via ammonia exchange, drying, roasting under 400 ~ 1000 Deg C, obtaining the goal product. Compare With ordinary untreated catalyst, the invention of the modified molecular sieve catalysts show good mixed reaction olefin aromatization Stability.

Description

technical field [0001] The invention relates to a modified molecular sieve catalyst. [0002] The present invention also relates to a preparation method of the above-mentioned molecular sieve catalyst. [0003] The present invention also relates to the application of the above-mentioned molecular sieve catalyst. Background technique [0004] At present, most of the mixed light hydrocarbons from refineries, especially liquefied gas, are directly burned as household fuels. However, with the increasing shortage of non-renewable petroleum energy, the potential application value of liquefied gas as a petroleum product needs to be improved. At the same time, with the improvement of environmental protection requirements, liquefied petroleum gas has been paid more and more attention as a clean fuel for vehicles. However, liquefied petroleum gas directly from refineries contains a large amount of olefins and cannot be directly used as vehicle fuel. Isobutene in liquefied gas can be...

Claims

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Application Information

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IPC IPC(8): B01J29/06B01J29/40B01J37/00C07B37/08
Inventor 徐龙伢宋月芹朱向学白杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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