A kind of propane dehydrogenation propylene composite alumina support catalyst and preparation method thereof

A composite alumina and propane dehydrogenation technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of catalyst strength not mentioned, not involved To adjust the characteristics of alumina carrier and its forming process, etc., to achieve the effect of suitable carrier pore structure, high propylene selectivity and good application prospects

Active Publication Date: 2019-07-30
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Al 2 o 3 In the preparation method of the Pt-based propane dehydrogenation catalyst as the carrier, the modulation of the characteristics of the alumina carrier itself and its molding process are not involved, and the problem of catalyst strength is not mentioned.

Method used

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  • A kind of propane dehydrogenation propylene composite alumina support catalyst and preparation method thereof
  • A kind of propane dehydrogenation propylene composite alumina support catalyst and preparation method thereof
  • A kind of propane dehydrogenation propylene composite alumina support catalyst and preparation method thereof

Examples

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preparation example Construction

[0030] A preparation method of a propane dehydrogenation propylene composite alumina carrier catalyst, comprising the following steps:

[0031] 1) Divide pseudo-boehmite into part A and part B, calcining part A of pseudo-boehmite in a tube furnace under air ventilation conditions, and simultaneously calcining part B of pseudo-boehmite in a tube furnace , Mix the powders of Part A and Part B calcined above and grind them for use.

[0032] Specifically, according to the mass ratio of γ-alumina and θ-alumina in the catalyst composite alumina carrier, pseudo-boehmite is divided into A part and B part, wherein the mass of A part corresponds to the mass ratio of γ-Al 2 o 3 , the mass of B parts corresponds to θ-Al 2 o3 , and then calcining part A of pseudo-boehmite in a tube furnace at 450-750°C for 3-5 hours under the condition of air ventilation; at the same time, calcining part B of pseudo-boehmite in a tube furnace at 900-1150°C Calcining for 3-5 hours under the same conditio...

example 1

[0045] 1. Divide pseudo-boehmite into part A and part B according to the mass, and the mass ratio of the two is 3:7; calcinate part A of pseudo-boehmite in a tube furnace at 450°C for 8 hours under the condition of air ventilation ; Simultaneously calcining part B of pseudo-boehmite in a tube furnace at 1050°C for 4 hours; mixing the calcined powders of part A and part B above and grinding them for use.

[0046] 2. After mixing the weighed chlorides of modifiers Sn, Zn, K and Ce, add distilled water to dissolve to form a mixed solution of four chlorides.

[0047] 3. Pour the mixed material in step 1) into the kneader, turn on the kneading function, and then add the solution prepared in step 2) dropwise; after kneading for 4 hours, take it out and put it in an oven to dry at 100°C, and Calcined at 450°C for 8h.

[0048] 4. After fully grinding the catalyst precursor prepared in step 3), add the peptizer. The peptizer is aluminum sol, the amount of which is 8% of the mass of t...

example 2

[0052] 1. Divide pseudo-boehmite into part A and part B according to the mass, and the mass ratio of the two is 4:6; calcinate part A of pseudo-boehmite in a tube furnace at 750°C for 4 hours under the condition of air ventilation ; Simultaneously calcining part B of pseudo-boehmite in a tube furnace at 950°C for 5 hours; mixing the calcined powders of part A and part B above and grinding them for use.

[0053] 2. After mixing the weighed chlorides of modifiers Sn, Ge, Ca and La, add distilled water to dissolve to form a mixed solution of four chlorides.

[0054] 3. Pour the mixed material in step 1) into the kneader, turn on the kneading function, and then add the solution prepared in step 2) dropwise; after kneading for 4 hours, take it out and put it in an oven to dry at 100°C, and Calcined at 550°C for 4h.

[0055] 4. After fully grinding the catalyst precursor prepared in step 3), add the peptizer. Wherein the peptizing agent is an aluminum sol, and its addition amount ...

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Abstract

The invention provides a composite alumina carrier catalyst for propane dehydrogenation for producing propylene, and belongs to the technical field of dehydrogenation catalysts. The catalyst comprises0.1-0.4% of a precious metal Pt, 0.5-4.0% of a modifier, and the balance of a composite alumina carrier, and the composite alumina carrier is a gamma-alumina and theta-alumina mixture, and the mass fraction of the gamma-alumina in the carrier is 30-80%. The invention also provides a preparation method of the catalyst. The preparation method comprises the following steps: dividing pseudoboehmite into a part A and a part B, calcining the part A and the part b in different modes to respectively obtain the gamma-alumina and theta-alumina, mixing the gamma-alumina with the theta-alumina, adding modification elements, and carrying out impregnation to load an active component. The gamma-alumina and theta-alumina are used as a composite alumina carrier, the pores of the catalyst carrier are adjusted, and the carrier is modified with multiple component elements, so the catalyst has the advantages of excellent propane dehydrogenation activity and stability, simple forming technology, high strength, high applicability and excellent industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of dehydrogenation catalysts, in particular to a composite alumina carrier catalyst for propane dehydrogenation to propylene and a preparation method thereof. Background technique [0002] Propylene is one of the important basic organic chemical raw materials and occupies an important position in the modern petroleum and chemical industry. With the rapid growth of demand for derivatives such as polypropylene, the demand for propylene is also increasing year by year. Therefore, it has become an urgent need for my country and global chemical companies to seek efficient and reasonable industrial-scale new technologies for increasing propylene production. Considering economics and maturity indicators comprehensively, propane dehydrogenation (PDH) technology is currently the most competitive propylene process. Propane dehydrogenation technology has a history of 22 years and more than 20 sets of commercialized u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/63B01J37/02B01J37/08C07C5/333C07C11/06
CPCY02P20/52
Inventor 韩伟潘相米吴砚会会艾珍谭亚南王科
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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