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Preparation and use of nano HZSM-5 zeolite metallic ion composite modified catalyst

A HZSM-5, composite modification technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalyst activity and poor stability, and achieve high reactivity and strong carbon capacity. , the effect of high para-selectivity

Inactive Publication Date: 2004-11-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although modified by different methods, the selectivity of p-diethylbenzene can reach 98%, but the catalyst activity is low and the stability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The synthesized nanometer NaZSM-5 molecular sieve is calcined in a muffle furnace at a temperature of 300-540° C. for 10 hours. The roasted HZSM-5 was exchanged with 0.4mol / l ammonium nitrate solution, the solid-to-liquid ratio was 1g:20ml, the exchange temperature was 90°C, exchanged twice in total, and roasted at 540°C for 6h to obtain powdery nanometer HZSM-5 Molecular sieve.

[0031] The 100% nanometer HZSM-5 molecular sieve is used for the alkylation reaction of ethylbenzene and ethylene.

[0032] Reaction conditions: reaction temperature 340°C, ethylbenzene / ethylene (molar ratio) 5.5:1, ethylbenzene mass space velocity 5h -1 , Atmospheric pressure. The conversion rate of ethylbenzene was 46.73%, and the selectivity to p-diethylbenzene was 31.30%.

Embodiment 2

[0034] The extruded catalyst uses nanometer HZSM-5 as the active component, Al 2 o 3 as the carrier. Mix the appropriate dry basis mass ratio of nano-HZSM-5 and alumina powder after sieving respectively, add a small amount of scallop powder, and mix with 10% HNO 3 The solution is an extrusion aid and a catalyst for extrusion. Catalysts A1, A2, and A3 with nano HZSM-5 weight percentages of 80%, 60%, and 40% were prepared. Carrier Al 2 o 3 The effect of content on the alkylation reaction of ethylbenzene and ethylene.

[0035] Reaction conditions: reaction temperature 340°C, ethylbenzene / ethylene (molar ratio) 5.1:1, ethylbenzene mass space velocity 5h -1 , Atmospheric pressure.

[0036] Ethylbenzene conversion and p-diethylbenzene selectivity are as follows

[0037] Catalyst number Ethylbenzene conversion (%) p-diethylbenzene selectivity (%)

[0038] A1 44.57 31.24

[0039] A2 44.06 31.15

[0040] A3 38.82 31.74

Embodiment 3

[0042] The hydrothermal treatment is based on the dry basis mass ratio of nanometer HZSM-5: Al 2 o 3 =8:2 extruded catalyst as the parent body, heated to the treatment temperature in the quartz tube, under normal pressure, using a peristaltic pump to process the catalyst. Influent quality air velocity is 1h -1 , for 6 hours. Catalysts B1, B2, and B3 were obtained by hydrothermal treatment at 500°C, 550°C, and 600°C, respectively. The effect of different hydrothermal treatment temperatures on the alkylation reaction of ethylbenzene and ethylene was investigated.

[0043] Ethylbenzene and ethylene alkylation reaction conditions: reaction temperature 340°C, ethylbenzene / ethylene (molar ratio) 5.5:1, ethylbenzene mass space velocity 5h -1 , Atmospheric pressure.

[0044] Ethylbenzene conversion and p-diethylbenzene selectivity are as follows:

[0045] Catalyst number Ethylbenzene conversion (%) p-diethylbenzene selectivity (%)

[0046] B1 38.84 32.38

[0047] ...

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Abstract

The invention provides a kind of nano HZSM-5 zeolite metal ion compound modified catalyst and the manufacturing method, which uses ethylbenzene and ethyolene as materials to produce diethylbenzene through alkylation. The catalyst uses nano HZSM-5 molecular sift and carrier Al2O3 as parent, carries 1-2 kinds of lanthanum, silicon, phosphorus and magnesium and so on active component, the modified catalyst can be produced through immersing, drying, baking. The invention has a large specific area, the channel is short, and the catalyst has high reaction activity and stability, and high para-selectivity.

Description

technical field [0001] The invention belongs to the preparation method of modified nanometer HZSM-5 zeolite catalyst and its application in preparing p-diethylbenzene by alkylation of ethylbenzene and ethylene. Background technique [0002] Production of p-diethylbenzene by alkylation of ethylbenzene and ethylene: Chinese patent 94110202.5 uses silicon-mixed rare earth modified ZSM-5 zeolite molecular sieve catalyst. The amount of mixed rare earths loaded on the catalyst is 2%, and then modified by hydrothermal treatment at 550° C. for 3 hours, and finally 30% of silicon is deposited. The reaction conditions for the alkylation of ethylbenzene and ethylene are: temperature 360°C, ethylbenzene weight space velocity 5h -1 , ethylbenzene / ethylene molar ratio=3 / 1, N 2 / Ethylene molar ratio = 5 / 1, normal pressure. The conversion rate of ethylbenzene was 19.20%, and the selectivity to diethylbenzene was 95.08%. [0003] Alkylation of ethylbenzene and ethanol to produce p-diethy...

Claims

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Application Information

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IPC IPC(8): B01J29/40
Inventor 王祥生杨志强李钢李连华
Owner DALIAN UNIV OF TECH
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