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Catalyst for preparing olefin by dehydrogenating low-carbon alkane, and preparation method and application thereof

A low-carbon alkane and catalyst technology is applied in the field of preparation of basic organic chemical raw materials, and achieves the effects of simple preparation method, large choice and moderate acidity

Inactive Publication Date: 2010-01-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, it has been found that the catalyst can also carry out interconversion of hydrocarbons, and the selectivity of low-carbon olefins is greatly improved due to its shape-selective effect and suitable acidity. The carrier has not been reported yet

Method used

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  • Catalyst for preparing olefin by dehydrogenating low-carbon alkane, and preparation method and application thereof
  • Catalyst for preparing olefin by dehydrogenating low-carbon alkane, and preparation method and application thereof
  • Catalyst for preparing olefin by dehydrogenating low-carbon alkane, and preparation method and application thereof

Examples

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preparation example Construction

[0026] The invention relates to a catalyst for preparing olefins by dehydrogenating low-carbon alkanes, including propane, butane and pentane, as well as its preparation method and application. The catalyst uses silicoaluminophosphate molecular sieve as a carrier, group VIII or VIB group elements as active components, group IVA elements as auxiliary agents, and dehydrogenates low-carbon alkanes to olefins under preferred reaction conditions. The reactor uses Fixed bed, moving bed reactor, or fluidized bed reactor.

[0027] A catalyst for the dehydrogenation of low-carbon alkanes to olefins provided by the present invention uses silicoaluminophosphate molecular sieves as a carrier, VIII or VIB group elements as active components, and IVA group elements as auxiliary agents. The weight percentage of the catalyst is 0.001-20%, and the auxiliary agent is 0.001-20% of the weight of the catalyst; the low-carbon alkanes include propane, butane and pentane. Described silicoaluminophos...

Embodiment 1

[0042] This example illustrates the preparation of the SAPO-34-supported propane dehydrogenation catalyst of the present invention.

[0043] First SAPO-34 molecular sieve in 0.16M SnCl 2 .2H 2 Immerse in O solution at 80° C. for 10 hours, the Sn loading in the catalyst reaches 0.001˜20 percent (mass percentage), and then dry at 120° C. for 6 hours. The dried samples were then calcined in an air atmosphere in a muffle furnace at a temperature of 550° C. for 4 hrs. Calcined Sn / SAPO-34 powder with 0.03M H 2 PtCl 6 ·6H 2 The O solution was impregnated at 80° C. for 4 hours, so that the Pt content in the final catalyst was 0.001-10%. It was then dried at 120°C for 6hrs, and then fired in a muffle furnace at 550°C for 4hrs. Prior to reaction evaluation, all catalyst samples were dechlorinated with steam at 500°C for 8 hr; then reduced with hydrogen at 550°C for 12 hr. By changing the content of Pt and Sn in the catalyst, A1-A5 catalysts were prepared respectively.

[0044] A...

Embodiment 2

[0049] This example illustrates the preparation of the SAPO-5-supported propane dehydrogenation catalyst of the present invention.

[0050] According to the method described in embodiment 1, at first SAPO-5 molecular sieve is in the SnCl of 0.16M 2 .2H 2 Immerse in O solution at 90° C. for 4 hours, the loading amount of tin in the catalyst reaches 0.5-2% (mass percentage), and then dry at 120° C. for 10 hours. These samples were then fired in a muffle furnace under air atmosphere for 4 hrs at a firing temperature of 400°C. Calcined Sn / SAPO-5 powder with 0.01M H 2 PtCl 6 ·6H 2 The O solution was impregnated at 90 °C for 4 hr, so that the Pt content in the final catalyst was 0.001-1%. Then dry at 120°C for 6hr, and then bake at 550°C for 4hr in a muffle furnace. The prepared catalysts D1 and D2 are composed of (Pt (0.5wt%) Sn (1.2wt%) / SAPO-5) and (Pt (0.001 wt%) Sn (0.001 wt%) / SAPO-5). Prior to reaction evaluation, all catalyst samples were dechlorinated with steam at 500...

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Abstract

The invention relates to a catalyst for preparing olefin by dehydrogenating low-carbon alkane, and a preparation method and an application thereof, which belong to the technical field of the preparation of basic organic chemical raw materials. The catalyst is prepared by a dipping method of using an aluminium silicophosphate molecular sieve as a carrier, VIII group or VIB group elements as active constituents and IVA group elements as an auxiliary agent. In the process for preparing olefin by dehydrogenating low-carbon alkane, the catalyst is firstly reduced by hydrogen gas, then participates in a reaction, and is finally regenerated. Compared with the existing catalyst for preparing olefin by dehydrogenating low-carbon alkane, the catalyst has a pore shape selecting function and moderate acidity, thereby the selectivity of the low-carbon alkane can reach more than 90 percent in the process for preparing olefin by dehydrogenating low-carbon alkane. The preparation method of the catalyst is simple; the regeneration process flow of the reaction has a large choice, a fixed bed, a fluidized bed or a moving bed can be used as a reactor, and the catalyst can be regenerated in the reactor or outside the reactor.

Description

technical field [0001] The invention relates to a catalyst for dehydrogenating low-carbon alkanes to olefins, a preparation method and application thereof, and belongs to the technical field of preparation of basic organic chemical raw materials. Background technique [0002] Propylene is an important organic chemical raw material, widely used in the preparation of polymer materials such as polypropylene and polyacrylonitrile, and products such as butanol, octanol, propylene oxide, isopropanol, and acrylic acid. Different from other chemicals, the current production of propylene is generally based on the co-production or by-product of naphtha steam cracking process and catalytic cracking process. Since the 1990s, the growth rate of my country's demand for propylene has exceeded that of ethylene. The original propylene Sources can no longer meet demand. A large amount of low-carbon alkanes are by-produced in catalytic cracking, naphtha steam cracking, MTO / MTP and other proces...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J23/26B01J23/89B01J23/60B01J37/02B01J37/08C07C5/333C07C11/06C07C11/08C07C11/10B01J37/18B01J23/96B01J23/92
Inventor 魏飞山尼汤效平王垚陈元君褚玥
Owner TSINGHUA UNIV
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