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Composite catalyst, preparation method thereof and preparation method of ethylene

A composite catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, carbon compound catalyst, catalyst, etc., can solve the problem of low selectivity

Inactive Publication Date: 2019-10-11
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

Although the coupling of methanol reaction and methanol-to-olefins reaction can significantly improve the selectivity of low-carbon olefins, the selectivity of ethylene obtained in the prior art is still low in hydrocarbon species, and its ethylene selectivity will not exceed 25%.

Method used

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  • Composite catalyst, preparation method thereof and preparation method of ethylene
  • Composite catalyst, preparation method thereof and preparation method of ethylene
  • Composite catalyst, preparation method thereof and preparation method of ethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] Weigh 21.46g Zr(NO 3 ) 4 ·5H 2 O, 11.90g Zn(NO 3 ) 2 ·6H 2 O and 7.5g Al(NO 3 ) 3 9H 2 O in a beaker, add 150mL deionized water, stir to obtain salt solution A. Weigh 23.55 g of ammonium carbonate into a beaker, add 150 mL of deionized water, and stir thoroughly to obtain precipitant alkali solution B. Under the condition of vigorous stirring (stirring rate is 450rpm / min), the salt solution A and the precipitant alkaline solution B are mixed in parallel flow, and the relative flow rate of solutions A and B is adjusted to ensure that the pH of the precipitation mixture is kept between 7 and 8 between. After co-precipitation, aging for 2h. After that, it was dried in an oven at 100° C. for 6 hours, and calcined in a muffle furnace at 500° C. for 4 hours to obtain a methanol synthesis catalyst. According to XRF elemental analysis, the methanol synthesis catalyst is composed of (ZnO) 0.4 (ZrO 2 ) 0.5 (Al 2 o 3 ) 0.1 .

[0122] Select pseudo-boehmite respec...

Embodiment 2

[0129]The methanol synthesis catalyst was obtained by using the same preparation method and preparation conditions as in Example 1. The specific preparation conditions of the modified H-MOR molecular sieve are shown in Table 2 below, and the rest of the operations are the same as in Example 1. The method and conditions for preparing the composite catalyst from the methanol synthesis catalyst and the modified H-MOR molecular sieve are the same as in Example 1.

[0130] Table 2

[0131] Catalyst number Calcination temperature (℃) Roasting time (h) Mass ratio of H-MOR molecular sieve to binder 2# 550 2 0.1 / 1 3# 400 6 6 / 1

[0132] table 3

[0133]

[0134] Catalyst 4#: The difference from Example 1 is that the carrier gas during the preparation of the modified H-MOR molecular sieve is CO 2 .

[0135] Catalyst 5#: The difference from Example 1 is that the carrier gas is hydrogen during the preparation of the modified H-MOR molecular sieve.

...

Embodiment 3

[0138] Adopt impregnation method to prepare methanol synthesis catalyst, concrete steps are as follows: Weigh 11.90g Zn(NO 3 ) 2 ·6H 2 O in a beaker, add 150mL of deionized water, stir to obtain salt solution C, 7.6g of chromium oxide powder and 2.04g of aluminum oxide are immersed in solution C, after immersion for 5h, slowly evaporate the solvent to dryness, and after preliminary drying, place in an oven Dry at 100°C for 10 hours. The dried solid powder was calcined at a temperature range of 550°C for 4h. Obtain methanol synthesis catalyst, its composition is (ZnO) 0.4 (Cr 2 o 3 ) 0.5 (Al 2 o 3 ) 0.1 .

[0139] Except that the preparation method of the methanol synthesis catalyst is different from that of Example 1, the rest of the steps are consistent with that of Example 1, and the catalyst obtained at last is marked as 6#. Under the same reaction conditions as in Example 1, the 6# catalyst was evaluated, and the reaction product was analyzed online by a gas chr...

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Abstract

The application discloses a composite catalyst, a preparation method thereof and a preparation method of ethylene. The composite catalyst contains a methanol synthesis catalyst and a modified H-MOR molecular sieve. The composite catalyst is used for preparing ethylene to break the distribution rule of hydrocarbon ASF in Fischer-Tropsch (F-T) synthesis, wherein the ethylene selectivity reaches 86%.

Description

technical field [0001] The application relates to a composite catalyst, a preparation method thereof and a preparation method of ethylene, and belongs to the field of synthesis gas production of low-carbon olefins. Background technique [0002] Ethylene is the basic chemical product with the largest production and consumption in the world. With the development of China's economy, the domestic demand for ethylene will continue to increase, but the existing production capacity is far from meeting the demand. At present, ethylene is mainly obtained through naphtha cracking, while China's resource endowment is "rich in coal, poor in oil, and low in gas", which seriously restricts the development of downstream industries and poses a serious threat to national energy security. Therefore, it is of practical significance to develop a method for producing ethylene based on non-petroleum resources such as coal. [0003] At present, the mature method of producing ethylene from syngas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/18B01J29/26B01J23/06B01J23/10B01J23/26B01J37/30B01J37/03B01J37/02C07C1/04C07C11/04
CPCB01J29/18B01J23/06B01J23/10B01J23/26B01J23/002B01J29/185B01J29/26B01J21/18B01J37/30B01J37/03B01J37/0201C07C1/043C07C1/0445B01J2229/38B01J2229/42B01J2229/18B01J2523/00C07C2529/18C07C2529/26B01J35/19C07C11/04B01J2523/27B01J2523/31B01J2523/48B01J2523/3712B01J2523/67Y02P20/52Y02P30/20Y02P30/40
Inventor 刘世平朱文良刘中民倪友明刘红超刘勇马现刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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