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Preparation method of shape-selective isomerization catalyst based on MTT type structure molecular sieve

A molecular sieve and catalyst technology, applied in the field of preparation of shape-selective isomerization catalysts, can solve the problems of reduced catalyst activity and isomer selectivity, achieve high activity and isomer yield, improve mass transfer, and shorten pores effect of depth

Active Publication Date: 2020-06-05
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

In actual use, the transparent and narrow micropore channel will inevitably lead to the reduction of catalyst activity and isomer selectivity

Method used

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  • Preparation method of shape-selective isomerization catalyst based on MTT type structure molecular sieve
  • Preparation method of shape-selective isomerization catalyst based on MTT type structure molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 20 g of ZSM-23 molecular sieve raw powder containing dimethylamine template (6% by weight of the molecular sieve) into a quartz tube, bake at 250° C. for 4 hours in an air atmosphere, and cool naturally to room temperature to obtain a microporous channel substrate. Carbon partially filled ZSM-23 molecular sieve carrier, the carbon content in the molecular sieve carrier is 4.8%, and the micropore volume is 0.010cm 3 / g. With 5.0mL containing Pt0.001g / mL of H 2 PtCl 6 The solution impregnates 5 g of the above-mentioned molecular sieve carrier. The impregnated sample was dried at 120°C for 2h, and at 200°C, the hydrogen flow rate was controlled at 5mL / min / g 催化剂 , and reduced for 4h to obtain 0.5wt.% Pt / ZSM-23 catalyst. The carbon content in the catalyst is 4.8%, and the micropore volume is 0.010cm 3 / g. The characterization results of catalyst carbon content and micropore volume are shown in Table 1, and the evaluation results of catalytic reaction are shown in T...

Embodiment 2

[0038] Put 20 g of ZSM-23 molecular sieve raw powder containing dimethylamine template (6% by weight of the molecular sieve) in a quartz tube, bake at 320 ° C for 4 h in a nitrogen atmosphere, and cool naturally to room temperature to obtain a microporous channel substrate. ZSM-23 molecular sieve carrier partially filled with carbon, the carbon content in the molecular sieve carrier is 3.7%, and the micropore volume is 0.032cm 3 / g. With 5.0mL containing Pt0.001g / mL of H 2 PtCl 6 The solution impregnates 5 g of the above-mentioned molecular sieve carrier. The impregnated sample was dried at 120°C for 2 hours, and at 300°C, the hydrogen flow rate was controlled at 20mL / min / g 催化剂 , and reduced for 4h to obtain 0.5wt.% Pt / ZSM-23 catalyst. The carbon content in the catalyst is 3.7%, and the micropore volume is 0.032cm 3 / g. The characterization results of catalyst carbon content and micropore volume are shown in Table 1, and the evaluation results of catalytic reaction are s...

Embodiment 3

[0040] Put 20 g of ZSM-23 molecular sieve raw powder containing dimethylamine template (6% by weight of the molecular sieve) in a quartz tube, bake at 400° C. for 4 hours in an air atmosphere, and cool naturally to room temperature to obtain a microporous channel substrate. ZSM-23 molecular sieve carrier partially filled with carbon, the carbon content in the molecular sieve carrier is 1.2%, and the micropore volume is 0.049cm 3 / g. With 5.0mL containing Pt0.001g / mL of H 2 PtCl 6 The solution impregnates 5 g of the above-mentioned molecular sieve carrier. The impregnated sample was dried at 120°C for 2 hours, and at 400°C, the hydrogen flow rate was controlled at 40mL / min / g 催化剂 , and reduced for 4h to obtain 0.5wt.% Pt / ZSM-23 catalyst. The carbon content in the catalyst is 0.8%, and the micropore volume is 0.052cm 3 / g. The characterization results of catalyst carbon content and micropore volume are shown in Table 1, and the evaluation results of catalytic reaction are s...

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Abstract

The invention discloses a preparation method of an isomerization catalyst taking an MTT type structure molecular sieve as a carrier. The preparation method of the catalyst comprises the following specific steps: firstly, roasting molecular sieve raw powder which has an MTT type structure and contains a template agent in an oxygen-containing atmosphere or an inert atmosphere at 200-450 DEG C; and then loading a VIII group noble metal active component on the treated molecular sieve, and drying and reducing to obtain the target catalyst. The pore channel depth of the molecular sieve is regulatedand controlled by controlling the roasting atmosphere and temperature in the molecular sieve carrier and the flow rate of a reducing gas. Compared with the catalyst prepared by the prior art, the catalyst prepared by the method provided by the invention shows high reaction activity and isomer yield in the isomerization reaction of n-alkanes.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, fine chemical industry and molecular sieve catalyst, and specifically relates to a preparation method and application of a shape-selective isomerization catalyst with MTT structure molecular sieve as a carrier. [0002] technical background [0003] Alkane isomerization plays a very important role in the upgrading process of oil products. The hydroisomerization of light alkanes can produce high-octane gasoline blending components, while the hydroisomerization of long-chain alkanes is mainly used to improve the low temperature flow properties of jet fuel, diesel oil and lubricating oil. At present, the most advanced catalysts used in this reaction are bifunctional catalysts in which molecular sieves are used as supports to support metal components with hydrogen addition (de)hydrogenation properties. US4710485, 5135638, 5282598, CN1792451, 1788844, 101245260 and other patent documents all repo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/74
CPCB01J29/7492Y02P20/52
Inventor 田志坚吕广王从新王苹马怀军王帅旗
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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