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Core-shell structure catalyst and method for preparing low-carbon olefin by using synthetic gas one-step method

A technology of core-shell structure and low-carbon olefins, which is applied in the direction of molecular sieve catalysts, hydrocarbon production from carbon oxides, chemical instruments and methods, etc., can solve the problems of low self-sufficiency rate and large consumption demand, so as to prolong the service life and reduce high Carbon product generation, effect of increasing the yield of the target product

Inactive Publication Date: 2013-05-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Low-carbon olefins are important organic chemical raw materials. my country's consumption demand is large, but the self-sufficiency rate is low

Method used

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  • Core-shell structure catalyst and method for preparing low-carbon olefin by using synthetic gas one-step method
  • Core-shell structure catalyst and method for preparing low-carbon olefin by using synthetic gas one-step method
  • Core-shell structure catalyst and method for preparing low-carbon olefin by using synthetic gas one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Mix the nitric acid solution of copper, zinc and aluminum with Na 2 CO 3 Solution co-precipitation, suction filtration, drying and roasting to obtain copper-zinc-aluminum oxide;

[0026] 2) Press Al 2 o 3 :P 2 o 5 : SiO 2 :TEAOH:H 2 The molar ratio of O was 0.3:1:0.2:2:100 to prepare a synthetic liquid, and reacted hydrothermally at 150°C for 20 hours to obtain molecular sieve crystal seeds. Coat the seed crystal on the surface of the copper-zinc-aluminum oxide carrier, put the seed-coated carrier into the synthesis solution and crystallize at 170°C for 100 hours to prepare the core-shell of copper-zinc-aluminum oxide coated with SAPO-17 molecular sieve membrane Structural catalyst, the obtained core-shell structure catalyst sees figure 2 , whose cross-sectional view is shown in image 3 , the thickness of the molecular sieve film is 6 microns, and the pore size of the shell film is 0.4 nm;

[0027] 3) Add the prepared core-shell structure catalyst into th...

Embodiment 2

[0030] 1) Mix the nitric acid solution of copper, zinc and cobalt with Na 2 CO 3 solution co-precipitation, suction filtration, drying and roasting to obtain copper-zinc-cobalt oxide;

[0031] 2) Press Al 2 o 3 : SiO 2 :TPAOH:EtOH:H 2 The molar ratio of O was 2:1:0.01:5:300 to configure the synthesis solution, and hydrothermally reacted at 180°C for 10 hours to obtain molecular sieve seeds. Coat the seed crystal on the surface of the copper-zinc-cobalt oxide carrier, put the seed-coated carrier into the synthesis solution and crystallize at 190°C for 50 hours to prepare the modified ZSM-5 molecular sieve membrane-coated copper-zinc-cobalt oxide Core-shell structure catalyst, molecular sieve membrane thickness 15 microns, shell membrane pore size 0.5nm;

[0032] 3) Add the prepared core-shell structure catalyst into the reaction tube, and reduce it with hydrogen diluted with nitrogen, wherein the volume percentage of hydrogen in the mixed gas is 5%;

[0033] 4) After the...

Embodiment 3

[0035] 1) Mix copper-zinc nitric acid solution, nickel-manganese-chromium hydrochloric acid solution with Na 2 CO 3 solution co-precipitation, suction filtration, drying and roasting to obtain copper zinc nickel manganese chromium oxide;

[0036] 2) Press Al 2 o 3 :P 2 o 5 : SiO 2 :TEAOH:H 2The molar ratio of O was 3:2:1.5:0.1:500 to configure the synthesis liquid, and hydrothermally reacted at 160°C for 40 hours to obtain molecular sieve seeds. Coat the seed crystal on the surface of the copper-zinc-nickel-manganese-chromium oxide support, put the seed-coated support into the synthesis liquid and crystallize at 165°C for 70 hours to prepare SAPO-34 molecular sieve membrane-coated copper-zinc-nickel-manganese-chromium oxide The core-shell structure catalyst of the material, the molecular sieve film thickness is 1 micron;

[0037] 3) Add the prepared core-shell structure catalyst into the reaction tube, and reduce it with hydrogen diluted with nitrogen, wherein the volu...

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Abstract

The invention discloses a core-shell structure catalyst and a method for preparing low-carbon olefin by using a synthetic gas one-step method. The core-shell structure catalyst couples methanol synthesis reaction and MTO (Methanol To Olefin) reaction together, so that synthetic gas is converted into the low-carbon olefin in one step. The core-shell structure catalyst takes a methanol synthesis catalyst as a core and an MTO reaction catalyst as a shell. The method for preparing the low-carbon olefin in one step on the core-shell structure catalyst comprises the following processes of: enabling reaction gas to firstly permeate through a shell catalyst pore channel to enter a core catalyst for reaction to generate methanol, enabling the generated methanol to be in contact with an active center of a shell catalyst in the process of dispersing the shell catalyst and reacting to generate the low-carbon olefin. The core-shell structure catalyst and the method have the benefits that the process route is simplified, the reaction equilibrium of the methanol synthesis reaction is broken through, and the conversion rate of CO (Carbonic Oxide) is improved; a shell simultaneously restrains the contact of the generated olefin with the core catalyst and prevents the generated olefin from being catalyzed into alkane by the catalyst; and a unique pore channel structure of the shell also has an effect of molecule screening, so that the generation of high-carbon products is reduced.

Description

technical field [0001] The invention provides a catalyst with a core-shell structure and a method for preparing low-carbon olefins from synthesis gas in one step, and belongs to the field of catalyst research for the synthesis of low-carbon olefins. technical background [0002] Low-carbon olefins are important organic chemical raw materials. my country's consumption demand is large, but the self-sufficiency rate is low. At present, the methods for producing low-carbon olefins can be generally divided into three categories according to the raw materials: petroleum route, natural gas route and coal route. In view of the current situation of rich coal, lack of oil, and little gas, coal is used as raw material to produce syngas, and then to produce low-carbon olefins from the syngas, which provides an ideal way to convert non-petroleum resources into basic organic chemical raw materials. [0003] At present, the industrial production of low-carbon olefins is carried out by a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J29/46C07C1/04C07C11/04C07C11/06
CPCY02P20/52
Inventor 陈丰秋陈艳平程党国詹晓力
Owner ZHEJIANG UNIV
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