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 carr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] Preparation of common catalyst:

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

[0032] 2) Place 5g of the catalyst obtained in step 1 in a continuous-flow fixed-bed reactor with an inner diameter of 10mm. The liquefied gas feedstock is heated at 350℃, 5atm, 2h -1 The catalyst was contacted under the condition of weight space velocity, and the reaction results are shown in Table 1.

[0033] Preparation of the catalyst of the present invention:

[0034] After calcination, 20g of Na-type ZSM-5 molecular sieve (with a silicon-to-aluminum ratio of 55) is placed in 1000ml,...

Example Embodiment

[0039] Example 2

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

[0041] Cumulative response

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

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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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