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Low-carbon olefin catalyst directly prepared from synthesis gas and preparation method and application

A technology of low-carbon olefins and catalysts, which is applied in the field of direct production of low-carbon olefins catalysts from synthesis gas and its preparation and application. It can solve the problems of waste of carbon resources and high selectivity, and achieve low selectivity, simple preparation process, and utilization of carbon resources. high rate effect

Active Publication Date: 2018-03-16
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above research results show that the main problem existing in the existing catalyst system is that although C 2 ＝ ~C 4 ＝ The selectivity has been improved, but the CO in the total product 2 The selectivity is high, reaching 45%, which not only causes waste of carbon resources, but also a large amount of CO 2 The generation of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 9g ZnO, 0.1g MnO, 0.1g In 2 o 3 , 0.7g Ga 2 o 3 , 0.7g NiO, 1.8g Cr 2 o 3 , 1g K 2 O. 2g SAPO-34, put it into a mortar and grind for 0.5 hours, then raise the temperature to 400°C in the muffle furnace at a rate of 0.2°C / min, and keep it at the calcination temperature for 15 hours to obtain ZnO, MnO, In 2 o 3 , Ga 2 o 3 , NiO, Cr 2 o 3 、K 2 O, SAPO-34 weight percent composition (wt.%) is the catalyst of 58.44, 0.65, 0.65, 4.55, 4.55, 11.69, 6.49, 12.99.

[0020] with H 2 / (H 2 +N 2) dilute hydrogen with a molar ratio of 0.5 is the reducing gas, and the reducing gas space velocity is 50h -1 , reduction pressure of 2 MPa, and reduction temperature of 400°C, the catalyst was reduced for 5 hours.

[0021] The reduced catalyst, in H 2 / CO molar ratio is 1.5, 2MPa, 420℃, 8000h -1 Synthesis of light olefins under certain conditions. CO conversion = 15.6 (Cmol%); CO 2 , oxygenated compounds, hydrocarbon product selectivity (Cmol%) are 8.5,3.7,87.8 resp...

Embodiment 2

[0023] Weigh 9g ZnO, 0.7g MnO, 0.7g In 2 o 3 , 0.1g Ga 2 o 3 , 0.1g NiO, 1.8g Cr 2 o 3 , 1g K 2 O, 2gHZSM-5, put it into a mortar and grind for 3 hours, then heat up to 350°C in a muffle furnace at a rate of 3°C / min, and keep it at the calcination temperature for 20 hours to prepare ZnO, MnO, In 2 o 3 , Ga 2 o 3 , NiO, Cr 2 o 3 、K 2 O, HZSM-5 weight percent composition (wt.%) is the catalyst of 58.44, 4.55, 4.55, 0.65, 0.65, 11.69, 6.49, 12.99.

[0024] with H 2 / (H 2 +N 2 ) Diluted hydrogen with a molar ratio of 0.5 is the reducing gas, and the reducing gas space velocity is 200h -1 , reduction pressure of 1 MPa, and reduction temperature of 350°C, the catalyst was reduced for 10 hours.

[0025] The reduced catalyst, in H 2 / CO molar ratio is 1.5, 8MPa, 380℃, 11000h -1 Synthesis of light olefins under certain conditions. CO conversion = 17.9 (Cmol%); CO 2 , oxygenated compounds, hydrocarbon product selectivity (Cmol%) are 6.7,4.9,88.4 respectively; Methane...

Embodiment 3

[0027] Weigh 9g ZnO, 0.4g MnO, 0.4g In 2 o 3 , 0.4g Ga 2 o 3 , 0.4g NiO, 1.8g Cr 2 o 3 , 1g K 2 O. 2g SAPO-34, put it into a mortar and grind for 2 hours, then raise the temperature to 400°C in a muffle furnace at a rate of 1.5°C / min, and keep it at the calcination temperature for 10 hours to obtain ZnO, MnO, In 2 o 3 , Ga 2 o 3 , NiO, Cr 2 o 3 、K 2 O, SAPO-34 weight percent composition (wt.%) is the catalyst of 58.44, 2.6, 2.6, 2.6, 2.6, 11.69, 6.49, 12.99.

[0028] with H 2 / (H 2 +N 2 ) dilute hydrogen with a molar ratio of 1 is the reducing gas, and the reducing gas space velocity is 100h -1 , reduction pressure of 2 MPa, and reduction temperature of 380°C, the catalyst was reduced for 10 hours.

[0029] The reduced catalyst, in H 2 / CO molar ratio is 3.5, 6MPa, 400℃, 5000h -1 Synthesis of light olefins under certain conditions. CO conversion = 34.1 (Cmol%); CO 2 , oxygenated compounds, hydrocarbon product selectivity (Cmol%) are 5.8,2.3,91.9 respectivel...

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PUM

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Abstract

A low-carbon olefin catalyst directly prepared from synthesis gas is composed of active components including, by weight, 30-60% of ZnO, 0.5-5% of MnO, 0.5-5% of In2O3, 0.5-5% of Ga2O3, 0.5-5% of NiO,10-45% of Cr2O3 and 2-7% of K2O and 10-40% of a carrier. The low-carbon olefin catalyst has advantages of simplicity of a preparation method, high low-carbon olefin selectivity, low CO2 selectivity and low methane selectivity.

Description

technical field [0001] The invention relates to a catalyst for synthesizing low-carbon olefins, a preparation method and application. Specifically, it relates to a catalyst for directly synthesizing low-carbon olefins from synthesis gas, a preparation method and an application. Background technique [0002] Low carbon olefins (C2 ＝ ~C4 ＝ ) are basic raw materials for the chemical industry. At present, the steam cracking process in the ethylene complex is mostly used at home and abroad to obtain low-carbon olefins. The cracking unit has high energy consumption and is completely dependent on petroleum resources. Combined with my country's energy structure characteristics of poor oil, little gas, and rich coal, the development of a process route for coal-based low-carbon olefins can reduce the dependence on oil resources and ensure national energy security. The synthesis methods of coal-based low-carbon olefins include indirect methods and direct methods. The indirect met...

Claims

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Application Information

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IPC IPC(8): B01J29/85B01J29/48B01J29/78C07C1/04C07C11/02
CPCB01J29/48B01J29/78B01J29/85B01J2229/18C07C1/0435C07C2529/48C07C2529/78C07C2529/85C07C11/02
Inventor 谭猗生杨国辉张涛宋法恩解红娟潘俊轩
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI