Catalyst for directly dehydrogenating propane to prepare propylene as well as preparation and application of catalyst

A catalyst and dehydrogenation technology, applied in molecular sieve catalysts, physical/chemical process catalysts, hydrocarbons, etc., can solve the problem of easy coking of catalysts, and achieve carbon deposition inhibition, good propylene activity and propylene selectivity, and less coking. Effect

Inactive Publication Date: 2017-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alumina carrier is highly acidic, causing the cata

Method used

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  • Catalyst for directly dehydrogenating propane to prepare propylene as well as preparation and application of catalyst
  • Catalyst for directly dehydrogenating propane to prepare propylene as well as preparation and application of catalyst
  • Catalyst for directly dehydrogenating propane to prepare propylene as well as preparation and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1

[0040] Preparation of molecular sieves with nano-flake MFI structure: NaOH, aluminum sulfate, water glass, template C 22-6-6 Br 2 , H 2 SO 4 And distilled water to 30Na 2 O:1Al 2 O 3 :100SiO 2 :8C 22-6-6 Br 2 :18H 2 SO 4 :4000H 2 The molar ratio of O (where "Na 2 The amount of O" refers to NaOH and Na 2 O) Stir and mix to prepare molecular sieve gel. The gel was placed in an autoclave equipped with a polytetrafluoroethylene inner layer and crystallized at 140-160°C for 120 hours. After the crystallization reaction is completed, the product is washed with distilled water, dried at 120°C, and then calcined at 550°C for 6 hours to obtain a nano-flaky MFI molecular sieve.

[0041] Catalyst preparation: Dissolve 0.082g chloroplatinic acid, 0.1753g magnesium nitrate and 0.2730g zinc nitrate in 50mL water to prepare a mixed solution, put 6g of the above-mentioned nanoflake MFI molecular sieve into it and soak in it for 12h, dry at 120℃, and then at 500℃ It is calcined ...

Example Embodiment

[0044] Example 2

[0045] Preparation of molecular sieve with nano-flakes MFI structure: NaOH, aluminum sulfate, white carbon black, template C 18-6-6 Br 2 , H 2 SO 4 And distilled water to 28Na 2 O:1Al 2 O 3 :300SiO 2 :8C 18-6-6 Br 2 :18H 2 SO 4 :4000H 2 The molar ratio of O is stirred and mixed to prepare a molecular sieve gel. The gel was placed in an autoclave equipped with a polytetrafluoroethylene inner layer and crystallized at 140-160°C for 120 hours. After the crystallization reaction is completed, the product is washed with distilled water, dried at 120°C, and then calcined at 550°C for 12 hours to obtain a nano-flaky MFI molecular sieve.

[0046] Catalyst preparation: Dissolve 0.080g chloroplatinic acid, 0.1351g calcium nitrate and 0.2730g zinc nitrate in 50mL water to prepare a mixed solution, put 6g of the above-mentioned nanoflake MFI molecular sieve into it and soak it for 12h, dry at 120℃, and then at 500℃ After calcination for 12 hours, a molecular sieve of Pt-Zn-...

Example Embodiment

[0049] Example 3

[0050] Preparation of molecular sieves with nano-flake MFI structure: NaOH, aluminum sulfate, silica sol, template C 16-6-3 Br 2 , H 2 SO 4 And distilled water to 26Na 2 O:1Al 2 O 3 :500SiO 2 :8C 16-6-3 Br 2 :18H 2 SO 4 :4000H 2 The molar ratio of O is stirred and mixed to prepare a molecular sieve gel. The gel was placed in an autoclave equipped with a polytetrafluoroethylene inner layer and crystallized at 140-160°C for 120 hours. After the crystallization reaction is completed, the product is washed with distilled water, dried at 120°C, and then calcined at 550°C for 6 hours to obtain a nano-flaky MFI molecular sieve.

[0051] Catalyst preparation: Dissolve 0.080g chloroplatinic acid, 0.0812g strontium nitrate and 0.1251g zinc chloride in 50mL water to prepare a mixed solution, put 6g of the above-mentioned nanoflake MFI molecular sieve into it, soak for 12h, dry at 120℃, and then It is calcined at 550°C for 10 hours to obtain a molecular sieve with a Pt-Zn-S...

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Abstract

The invention provides a catalyst for directly dehydrogenating propane to prepare propylene. The catalyst comprises a carrier, an active component loaded on the carrier and an auxiliary agent, wherein the carrier is a nano thin-sheet MFI structure molecular sieve; the auxiliary agent comprises at least one of IIB group metal elements and at least one of alkaline earth metal elements. The invention further provides a preparation method of the catalyst; the preparation method comprises the following steps: soaking the nano thin-sheet MFI structure molecular sieve into a water solution of a platinum group metal compound, a IIB group metal compound and an alkaline earth metal compound; drying and roasting to obtain a molecular sieve composition, so as to obtain a catalyst product. The invention further provides application of the catalyst to reaction for directly dehydrogenating the propane to prepare the propylene.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a catalyst for preparing propane and directly dehydrogenating propene, as well as its preparation and application. Background technique [0002] As an important organic chemical raw material, propylene is widely used in the production of chemical products such as polypropylene, acrylonitrile, propylene oxide, isopropanol and acrylic acid. Propylene is mainly derived from the co-production of ethylene from petroleum cracking and by-products of petroleum catalytic cracking and refining. Since the 1990s, due to the fact that the original source of propylene cannot meet the demand, propane dehydrogenation technology has become the third source of propylene after steam cracking to ethylene co-production and refinery catalytic cracking unit refining by-product. The development of dehydrogenation catalysts with high activity, high selectivity and high stability is still the core of propylene d...

Claims

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Application Information

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IPC IPC(8): B01J29/74B01J35/10C07C5/333C07C11/06
CPCY02P20/52
Inventor 刘晓玲冯静张明森
Owner CHINA PETROLEUM & CHEM CORP
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