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Metal modified SAPO-34 zeolite catalyst, preparation method thereof and use method thereof

A SAPO-34, metal modification technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low raw ethanol concentration and low space velocity, and achieve good ethylene selectivity and air The effect of high speed and low reaction temperature

Inactive Publication Date: 2012-10-24
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a metal-modified SAPO-34 molecular sieve catalyst and its preparation method and use method, which overcomes the deficiencies in the prior art and can effectively solve the problem of low raw material ethanol concentration and empty space when the existing molecular sieve catalyst catalyzes ethanol dehydration to ethylene. low speed problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The metal-modified SAPO-34 molecular sieve catalyst is obtained according to the following steps: the first step, ferric nitrate is added to deionized water and is mixed with an impregnation solution with a mass percentage of 4.92wt.%, and then 10 grams of SAPO are added -34 molecular sieve carrier, stir evenly to form a mixed solution; in the second step, put the mixed solution in a rotary evaporating flask at a speed of 60rpm, and impregnate the mixed solution in a rotary evaporator, the temperature of the mixed solution is 20°C to 80°C Rotate and impregnate for 12 hours. After impregnation, distill the water in the mixed liquid by vacuum distillation. The temperature of the water bath is controlled at 90°C, and the pressure of vacuum distillation is -0.08 to -0.09Mpa to obtain metal-modified SAPO-34 Molecular sieve raw powder; the third step is to dry the metal-modified SAPO-34 molecular sieve raw powder at a temperature of 100°C to 150°C for 2 hours to ...

Embodiment 2

[0023]Embodiment 2: The metal-modified SAPO-34 molecular sieve catalyst is obtained according to the following steps: the first step, magnesium nitrate is added to deionized water and mixed with an impregnation solution with a mass percentage of 7.27wt.%, and then 10 grams of SAPO are added -34 molecular sieve carrier, stir evenly to form a mixed solution; in the second step, put the mixed solution in a rotary evaporating flask at a speed of 60rpm, and impregnate the mixed solution in a rotary evaporator, the temperature of the mixed solution is 20°C to 80°C Rotate and impregnate for 12 hours. After impregnation, distill the water in the mixed liquid by vacuum distillation. The temperature of the water bath is controlled at 90°C, and the pressure of vacuum distillation is -0.08 to -0.09Mpa to obtain metal-modified SAPO-34 Molecular sieve raw powder; the third step is to dry the metal-modified SAPO-34 molecular sieve raw powder at a temperature of 100°C to 150°C for 2 hours to 8...

Embodiment 3

[0028] Embodiment 3: The metal-modified SAPO-34 molecular sieve catalyst is obtained according to the following steps: the first step, nickel nitrate is added to deionized water and is mixed with an impregnation solution with a mass percentage of 1.29wt.%, and then 10 grams of SAPO are added -34 molecular sieve carrier, stir evenly to form a mixed solution; in the second step, put the mixed solution in a rotary evaporating flask at a speed of 60rpm, and impregnate the mixed solution in a rotary evaporator, the temperature of the mixed solution is 20°C to 80°C Rotating impregnation at ℃ for 12 hours. After the impregnation, the water in the mixed solution was distilled out by vacuum distillation. The temperature of the water bath was controlled at 90°C, and the pressure of the vacuum distillation was -0.08 to -0.09Mpa to obtain metal-modified SAPO- 34 molecular sieve raw powder; in the third step, the metal-modified SAPO-34 molecular sieve raw powder is dried at a temperature of...

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Abstract

The invention relates to the field of technologies for preparing ethylene through dehydrating ethanol, and concretely relates to a metal modified SAPO-34 zeolite catalyst, a preparation method thereof and a use method thereof. The preparation method of the modified SAPO-34 zeolite catalyst comprises the following steps: adding a metal nitrate to deionized water to prepare a dipping solution having a percentage of the metal nitrate being 1.67-7.93wt%, adding 10g of an SAPO-34 zeolite carrier, and uniformly stirring to obtain a mixed solution. According to the invention, the metal modified SAPO-34 zeolite catalyst is prepared through dipping and modifying SAPO-34 zeolite by above metal salt, and is used for catalyzing the dehydration of ethanol to produce ethylene, so the production of ethylene through dehydrating ethanol by using the metal modified SAPO-34 zeolite catalyst has the characteristics of high ethanol conversion rate, good ethylene selectivity, high concentration of the raw material ethanol in the reaction, high ethanol air speed and low reaction temperature, thereby the ethylene yield is improved.

Description

technical field [0001] The invention relates to the technical field of ethanol dehydration to ethylene, and relates to a metal-modified SAPO-34 molecular sieve catalyst, a preparation method and a use method. Background technique [0002] Ethylene is the leader in the petroleum and chemical industries, and is the basic chemical raw material for synthetic fibers, synthetic rubber, and synthetic plastics. It is also widely used in the manufacture of vinyl chloride, styrene, ethylene oxide, acetic acid, and acetaldehyde. Ethylene demand is closely related to economic development, and the development of ethylene industry reflects the economic strength of a country. The traditional ethylene production technology is obtained by cracking naphtha. However, with the increasing demand for ethylene in my country and the depletion of world oil resources, the use of high-efficiency catalysts to catalyze the dehydration of bioethanol to prepare ethylene has been extensively studied. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85C07C11/04C07C1/24
CPCY02P20/52
Inventor 陆江银李娜高歌潘海涛
Owner XINJIANG UNIVERSITY
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