Low-carbon alkane dehydrogenation catalyst with highly-dispersed multi-element active components and preparation method of low-carbon alkane dehydrogenation catalyst

A dehydrogenation catalyst and active component technology, applied in the direction of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of high catalyst composition, slowness, large Pt loading, etc., and achieve high dehydrogenation reaction activity , long life and good operability

Inactive Publication Date: 2018-05-29
CNOOC TIANJIN CHEM RES & DESIGN INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problem that the active component of the catalyst existing in the existing preparation technology has only Pt as the active component, resulting in a large loading of Pt in the catalyst and a high composition of the catalyst; A low-carbon alkane dehydrogenation catalyst with highly dispersed components and a preparation method thereof. The low-carbon alkane dehydrogenation catalyst of the present invention has low precious metal content, high activity and slow deactivation when used at high temperatures

Method used

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  • Low-carbon alkane dehydrogenation catalyst with highly-dispersed multi-element active components and preparation method of low-carbon alkane dehydrogenation catalyst
  • Low-carbon alkane dehydrogenation catalyst with highly-dispersed multi-element active components and preparation method of low-carbon alkane dehydrogenation catalyst
  • Low-carbon alkane dehydrogenation catalyst with highly-dispersed multi-element active components and preparation method of low-carbon alkane dehydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Catalyst A: Catalyst A contains Cu: 0.50w%, Ir: 0.10w%, Pt: 0.15w%, Rh: 0.05w% and K: 0.70w%, and the rest is Al 2 o 3 , the preparation method is as follows:

[0019] (1) Prepare the carrier containing the active ingredient

[0020] Weigh commercially available spherical alumina carrier (particle diameter 1.6mm, pore volume 0.60cm 3 / g, specific surface area 150m 2 / g, water absorption rate 80%, the following examples all use this carrier) 50g.

[0021] Mix 1.9ml of 0.2M chloroplatinic acid aqueous solution, 19.7ml of 0.2M copper chloride aqueous solution, 1.3ml of 0.2M chloroiridic acid aqueous solution and 1.2ml of 0.2M rhodium chloride aqueous solution , add 8ml of concentrated hydrochloric acid, and finally add deionized water to make the volume of the soaking solution finally constant to 40ml. Slowly add the impregnating liquid into the alumina carrier, and stir while adding, so that the impregnating liquid is evenly loaded on the carrier.

[0022] The carri...

Embodiment 2

[0026] Catalyst B: Catalyst B contains Cu: 0.50w%, Ir: 0.08w%, Pt: 0.15w%, Pd: 0.06w% and K: 0.90w%, and the rest is Al 2 o 3 , the preparation method is as follows:

[0027] (1) Prepare the carrier containing the active ingredient

[0028] Weigh 50 g of a commercially available spherical alumina carrier. Mix 1.9ml of 0.2M chloroplatinic acid aqueous solution, 19.7ml of 0.2M copper chloride aqueous solution, 1.0ml of 0.2M chloroiridic acid aqueous solution and 1.4ml of 0.2M palladium chloride aqueous solution , add 5ml of concentrated hydrochloric acid, and finally add deionized water to make the impregnation solution finally constant to 40ml. Slowly add the impregnating liquid into the alumina carrier, and stir while adding, so that the impregnating liquid is evenly loaded on the carrier.

[0029] The steps of aging, drying, roasting and chlorination of the carrier loaded with active components are the same as the method in (1) of Implementation 1, except that the chlorin...

Embodiment 3

[0033] Catalyst C: Catalyst C contains Cu: 0.60w%, Ir: 0.05w%, Pt: 0.20w%, Au: 0.05w% and K: 0.80w%, the rest is Al 2 o 3 , the preparation method is as follows:

[0034] (1) Prepare the carrier containing the active ingredient

[0035]Weigh 50 g of a commercially available spherical alumina carrier. Mix 2.6ml of 0.2M chloroplatinic acid aqueous solution, 23.6ml of 0.2M copper chloride aqueous solution, 0.65ml of 0.2M chloroiridic acid aqueous solution and 0.7ml of 0.2M chloroauric acid aqueous solution , add 5ml of concentrated hydrochloric acid, and finally add deionized water to make the impregnation solution finally constant to 40ml. Slowly add the impregnating liquid into the alumina carrier, and stir while adding, so that the impregnating liquid is evenly loaded on the carrier.

[0036] The steps of aging, drying, roasting and chlorination treatment of the carrier loaded with active components are the same as the method in (1) of implementing 1, and the difference is...

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Abstract

The invention discloses a low-carbon alkane dehydrogenation catalyst with highly-dispersed multi-element active components. The active components of the catalyst are not single precious metal and arecompounded by multiple metals, wherein three active components are Cu, Ir and Pt; the fourth active component is one or more of Rh, Pd, Ag and Au. The total content of the precious metal in the catalyst is not higher than 0.30 weight percent. By controlling the mole ratio of all the active components in the catalyst and using the preparation method for obtaining the catalyst with the highly-dispersed active components by drying, roasting and chlorination treatment under anaerobic conditions, the catalyst disclosed by the invention has the advantages that the loading amount of the precious metal can be effectively reduced and the cost of the catalyst is reduced; in addition, the catalyst has better dehydrogenation activity, slower inactivation and longer service life.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a catalyst and a preparation method for preparing corresponding olefins by dehydrogenating low-carbon alkanes. Background technique [0002] Propylene is an important organic chemical raw material, and its main source is the by-products of traditional oil refining processes such as steam cracking and catalytic cracking. Therefore, the production of propylene is subject to the production of the main products ethylene and refined oil. The propylene output of the current traditional process cannot meet the market demand for propylene, and the market gradually pays attention to the new alternative production process of propylene, including propane dehydrogenation (PDH), methanol to olefins (MTO, MTP), deep catalytic cracking (DCC), olefin cracking and olefin disproportionation and other five processes. In comparison, the advantages of propane dehydrogenation technology are more ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C5/333C07C11/06
CPCB01J23/8946C07C5/3337C07C11/06Y02P20/52
Inventor 蔡奇孙彦民吴青吴同旭宋君辉王栋杨玉旺郭秋双李晓云
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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