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Light alkane dehydrogenation catalyst and preparation method

A technology of low-carbon alkanes and catalysts, which is applied in the field of catalysts and preparations of low-carbon alkanes dehydrogenation catalysts, which can solve the problems of slow deactivation rate of catalyst carbon deposition, insufficient mechanical strength of catalysts, and poor stability of catalysts, so as to improve catalytic activity and stability, preventing aggregation, and stabilizing catalyst performance

Active Publication Date: 2015-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that there are problems in the prior art that the mechanical strength of the catalyst is not enough, it is easy to be crushed, it is easy to deactivate due to carbon deposition during high temperature use, and the catalyst has poor stability. A new catalyst for low-carbon alkanes is provided. A catalyst for dehydrogenation to low-carbon olefins. This catalyst is used in the process of low-carbon alkane dehydrogenation to low-carbon olefins. It has the advantages of slow catalyst deactivation rate and high catalyst stability when used under high temperature conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 99.3g of pseudo-boehmite raw powder with an average particle size of 10μm to 300.7g of pseudo-boehmite raw powder with an average particle size of 70μm, and then add 12.1g of safflower powder and 150ml of deionized water for kneading Fully extruded strips, placed at room temperature for 12 hours and then dried, the drying conditions are: first at 90°C for 3 hours, then at 120°C for 10 hours, after drying, cut into pellets and roast at 750°C for 4 hours. carrier. The resulting support strength was 203 N / cm.

[0036] Use impregnation technology to load the additive components, that is, use the obtained alumina carrier to impregnate the required amount of additive aqueous solution for 24 hours at room temperature, including 3.42g of sodium nitrate, dry it, and bake it at 600°C for 6 hours. Composite carrier containing catalytic promoters. Continue to use the impregnation technique to load the platinum tin component (2.13g platinum nitrate; 11.06g mixed aqueous soluti...

Embodiment 2

[0039] Add 240.0g of pseudo-boehmite raw powder with an average particle size of 10μm to 160.4g of pseudo-boehmite raw powder with an average particle size of 90μm, and then add 12.1g of scallop powder and 150 ml of deionized water for kneading Extrude strips fully, place at room temperature for 12 hours, and then dry. The drying conditions are: firstly at 90°C for 3 hours, then at 120°C for 10 hours, after drying, cut into pellets and roast at 650°C for 3 hours. carrier. The carrier strength was 254 N / cm.

[0040] Carry on cocatalyst (4.37g sodium nitrate) and platinum-tin component (2.37g platinum nitrate; 12.96g the mixed aqueous solution of stannous sulfate) respectively with the catalyst preparation method of embodiment 1 to obtain catalyst sample, denoted as B. The evaluation results are shown in Table 1.

[0041]

Embodiment 3

[0043] Add 141.1g of pseudo-boehmite raw powder with an average particle size of 20μm to 358.4g of pseudo-boehmite raw powder with an average particle size of 70μm, and then add 12.1g of safflower powder and 150 ml of deionized water for kneading Extrude strips fully, place at room temperature for 10 hours and then dry. The drying conditions are as follows: first at 90°C for 4 hours, then at 120°C for 9 hours, after drying, cut into pellets and roast at 700°C for 5 hours. carrier. The carrier strength was 167 N / cm.

[0044] Carry on cocatalyst (3.13g sodium nitrate) and platinum-tin component (2.24g platinum nitrate; 12.08g mixed aqueous solution of stannous sulfate) separately with the catalyst preparation method of Example 1 to obtain catalyst samples, denoted as C. The evaluation results are shown in Table 1.

[0045]

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Abstract

The invention relates to a light alkane dehydrogenation catalyst for preparation of light olefins and a preparation method thereof. The invention mainly solves the problem that a present catalyst has low mechanical strength and is easy to crush and carbon deposit and inactivation easily happen under high-temperature condition to influence single-pass stability of the catalyst. According to the invention, a light alkane dehydrogenation catalyst for preparation of light olefins is adopted, wherein the catalyst contains platinum metals, group IVA element, group IA or IIA element, group IIB element and group VIIA element of the Periodic Table of the Elements, rare earth element and a carrier aluminium oxide. By the technical scheme, the above problem is solved well. The preparation method can be used in industrial production of the light alkane dehydrogenation catalyst for preparation of light olefins.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation catalyst and a preparation method thereof. Background technique [0002] The dehydrogenation of light alkanes to olefins is an important chemical process. With the development of the chemical industry, low-carbon olefins have a wide range of uses and values ​​as important raw materials for the production of plastics, synthetic rubber, drugs, gasoline additives, ion exchange resins, detergents, fragrances and various chemical intermediates. Propylene / isobutene mainly comes from the co-production or by-product of steam cracking and fluid catalytic cracking process in refineries. With the increasing demand for low-carbon olefins, the traditional production process is difficult to meet the rapid growth of market demand. At present, a large amount of low-carbon alkanes obtained from refineries are the main components of liquefied petroleum gas, which are mainly used as civil fuels, have not been ...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J23/63B01J23/89C07C11/09C07C11/06C07C5/333
CPCY02P20/52
Inventor 樊志贵吴文海曾铁强吴省缪长喜
Owner CHINA PETROLEUM & CHEM CORP
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