Method for rapid screening high-selectivity methanol-to-olefin catalyst

A methanol-to-olefins, high-selectivity technology, applied in the direction of chemical analysis using catalysis, etc., to achieve the effect of short experiment time, simple operation, and avoidance of use

Active Publication Date: 2015-08-05
天津众智科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, to judge whether the newly developed MTO catalyst has good catalytic performance, the method is mainly to evaluate its reaction, check its reactivity and diolefin selectivity, and this process takes a long time

Method used

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  • Method for rapid screening high-selectivity methanol-to-olefin catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare the catalyst according to the method of Example 34 in the patent No. US4,440,871, numbered as A, respectively with ethylene / helium (volume ratio is 20 / 80) and propylene / krypton gas (volume ratio is 80 / 20) As a probe molecule, a TAP experiment was performed on the catalyst.

[0025] (1) Fill 8 mg of catalyst powder in the reactor, which is filled with inert silicon carbide particles with a height of 1 cm and a particle size of 210 μm;

[0026] (2), vacuumize the reactor, and then heat it up to 100°C at a rate of 10°C / min;

[0027] (3) The mixed gas ethylene / helium with a volume ratio of 20 / 80 is injected into the reactor in a pulsed manner, the pulse time is 360 μs, and a quadrupole mass spectrometer is connected to the outlet of the reactor to detect For ethylene gas, a spectrogram is formed with time as the abscissa and signal intensity as the ordinate, and the time from the peak out of the spectrum to the end of the peak is the residence time of the gas in th...

Embodiment 2

[0034] According to the method for preparing the catalyst in the patent of CN 104129800A according to the application publication number, the numbering is denoted as B, respectively with ethylene / neon (volume ratio is 40 / 60) and propylene / helium (volume ratio is 70 / 30) As a probe molecule, the catalyst was subjected to a TAP experiment.

[0035] (1), 15 mg of catalyst powder is filled in the reactor, and its top and bottom are filled with inert silicon carbide particles with a particle size of 220 μm and a height of 2 cm;

[0036] (2), vacuumize the reactor, and then heat it up to 110°C at a rate of 15°C / min;

[0037] (3) The mixed gas ethylene / neon gas with a volume ratio of 40 / 60 is injected into the reactor in a pulsed manner, the pulse time is 360 μs, and a quadrupole mass spectrometer is connected to the outlet of the reactor to detect For ethylene gas, a spectrogram is formed with time as the abscissa and signal intensity as the ordinate, and the time from the peak out ...

Embodiment 3

[0044] According to the method for preparing the catalyst in the patent of CN 104326483A according to the application publication number, the numbering is denoted as C, respectively with ethylene / argon (volume ratio is 50 / 50) and propylene / neon gas (volume ratio is 60 / 40) As a probe molecule, the catalyst was subjected to a TAP experiment.

[0045] (1) Fill 20 mg of catalyst powder in the reactor, which is filled with inert silicon carbide particles with a height of 3 cm and a particle size of 230 μm;

[0046] (2), vacuumize the reactor, and then heat it up to 125°C at a rate of 20°C / min;

[0047] (3) Inject the mixed gas ethylene / argon with a volume ratio of 50 / 50 into the reactor in a pulsed manner, the pulse time is 360 μs, and a quadrupole mass spectrometer is connected to the outlet of the reactor to detect For ethylene gas, a spectrogram is formed with time as the abscissa and signal intensity as the ordinate, and the time from the peak out of the spectrum to the end of t...

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Abstract

A method for rapid screening a high-selectivity methanol-to-olefin catalyst includes filling catalyst powder into a reactor and enabling the upper portion and the lower portion of the reactor to be filled with inert silicon carbide particles; vacuumizing the reactor and then heating the reactor to the temperature of 50-300 DEG C at a speed rate of 5-30 DEG C / min; injecting mixed gas of ethylene / inert gas and propylene / inert gas within a volume ratio range of (20 / 80)-(80 / 20) into the reactor in a pulsing manner, measuring stopping time of ethylene and stopping time of propylene in a reactor bed layer, and judging average diolefin selectivity of the catalyst according to the stopping time. The method for rapid screening the high-selectivity methanol-to-olefin catalyst has the advantages of simplicity in operation, short time and high accuracy.

Description

technical field [0001] The invention relates to a method for rapidly screening methanol-to-olefin catalysts with high diolefin selectivity. technical background [0002] Low-carbon olefins, namely ethylene and propylene, are two very important basic chemical raw materials in modern industrial society, and their demand will continue to grow. Methanol to Olefin (MTO for short) is a chemical technology that uses methanol synthesized from coal or natural gas as a raw material to generate low-carbon olefins with the help of catalysts. The key to methanol-to-olefins technology is to develop catalysts with high activity, good selectivity and high stability. At present, the catalysts used for methanol to olefins mainly include ZSM-5 and SAPO-34 molecular sieves. [0003] US6,087,180 discloses a technique (Temporal Analysis of Products, TAP for short) for studying the interaction mechanism between gas and solid phase. TAP is an impulse response experimental method that brings prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/10
Inventor 常云峰王霞
Owner 天津众智科技有限公司
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