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Pt-Sn-based mesoporous catalyst for anaerobic dehydrogenation of propane as well as preparation and application thereof

A catalyst and mesoporous-based technology, which is applied in the field of platinum-tin-based mesoporous catalysts for anaerobic dehydrogenation of propane, can solve problems such as poor crystallization performance, limited dispersion of active components, serious alkane cracking and carbon deposition reactions, and achieve The effect of improving conversion rate and selectivity, large specific surface area, and uniform distribution

Inactive Publication Date: 2019-03-29
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the ordered pure silicon mesoporous material has a high specific surface area, its crystallinity is not strong, the carrier itself does not have catalytic performance, and the dispersion of active components is also limited.
On the other hand, although common microporous materials such as ZSM-5 have rich microporous structure, orderly channel structure, better thermal stability and mechanical stability, alkane cracking and carbon deposition reactions are more serious.

Method used

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  • Pt-Sn-based mesoporous catalyst for anaerobic dehydrogenation of propane as well as preparation and application thereof
  • Pt-Sn-based mesoporous catalyst for anaerobic dehydrogenation of propane as well as preparation and application thereof
  • Pt-Sn-based mesoporous catalyst for anaerobic dehydrogenation of propane as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Pt 0.5 sn 1.0 Preparation of / SBA-16 catalyst (CTAB / F127=0.2, platinum loading is 0.5wt%, tin loading is 1.0wt%)

[0082] First, dissolve 3g of F127 in 144g of deionized water, add 0.6g of CTAB, stir thoroughly, add 5.94g of concentrated hydrochloric acid, stir in a water bath for 60min, then add 14.2g of tetraethyl orthosilicate, stir in a water bath for 24h, and crystallize in a 100°C oven 24h, then filter and wash the liquid in the crystallization tank, and then dry it in an oven at 100°C for 12h, at 2°C·min -1 The heating rate was roasted at 550°C for 6h to obtain the SBA-16 sample. Then take 0.133g H 2 PtCI 6 ·6H 2 O was dissolved in 10ml of deionized water, and then weighed 0.2649g of SnCl 4 ·5H 2 Dissolve O in 10ml of deionized water, take 5g of SBA-16 molecular sieve after it is completely dissolved, then add 5ml of the prepared precursor liquid to the molecular sieve dropwise with a pipette gun, stir while adding, after stirring evenly, ultrasonically cl...

Embodiment 2

[0084]The morphology of the as-prepared PtSn / SBA-16 catalyst was observed by transmission electron microscope (TEM). The BET specific surface area analyzer was used to analyze the specific surface area and pore size distribution of the catalyst, and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) was used to further understand the charge transfer and coordination structure of the sample.

[0085] figure 1 For the Pt prepared in Example 1 0.5 sn 1.0 / SBA-16 (0.2CTAB) (left) and Pt 0.5 sn 1.0 / SBA-16 (right) Transmission electron microscope (TEM) photo of the catalyst. It can be seen from the figure that on the one hand, the average particle size of Pt added with CTAB is much smaller than that of pure SBA-16, which improves the utilization efficiency and reactivity of Pt; on the other hand, it also improves the dispersion of Pt, so that the catalyst has better stability.

[0086] figure 2 and image 3 For the Pt prepared in Example 1 0.5 sn 1.0 / SBA-...

Embodiment 3

[0092] Catalyst Performance Evaluation:

[0093] Before the reaction activity test, about 0.15 g of the catalyst was weighed, and then put into a tablet machine for tableting and sieving, and a part of 40-60 mesh was taken to obtain a catalyst with a certain particle size. The reduction was performed under a hydrogen atmosphere and then tubed for activity testing.

[0094] The test device for catalyst activity is a fixed bed reactor. The fixed-bed reactor is connected to a gas chromatograph SP-2100 equipped with a nickel reformer, and the resulting catalyst activity will be analyzed on a computer.

[0095] Slowly put the sieved catalyst particles into the quartz reaction tube, fix the catalyst from both ends of the catalyst with quartz wool, and insert the thermocouple into the catalyst particle, so that the thermocouple can be in contact with the catalyst particle to obtain more accurate The reaction temperature of the catalyst. Open the flow switch of each gas, adjust to ...

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Abstract

The invention provides a Pt-Sn-based mesoporous catalyst for anaerobic dehydrogenation of propane as well as preparation and application thereof. The average specific surface area of the Pt-Sn-based mesoporous catalyst is 850 m<2> / g. The Pt-Sn-based mesoporous catalyst is obtained by adding CTAB (Cetyltrimethyl Ammonium Bromide) for regulating a carrier structure in a carrier preparation process and loading active components to a carrier by adopting an equivalent-volume impregnation method, wherein Pt and Sn elements are used as the active component. The whole catalyst system provided by the invention is uniform in structure and has high chemical stability.

Description

technical field [0001] The invention relates to the field of catalysts. Specifically, the invention relates to a platinum-tin-based mesoporous catalyst for anaerobic dehydrogenation of propane and its preparation and application. Background technique [0002] Low-carbon olefins represented by propylene are widely used and are the basic raw materials for the further production of various chemical products in industry. It can be mainly used to prepare polypropylene (accounting for about 2 / 3 of the total consumption), various oxygen-containing compounds (propylene oxide, acetone, carbonyl alcohol, acrolein, acrylic acid, etc.), acrylonitrile, cumene, etc. important chemical products. [0003] At present, the production and supply pressure of light oil products in my country is relatively high. On the one hand, it is because there are more heavy oil products in petroleum resources, and on the other hand, it is also due to the high demand for light oil products in other industri...

Claims

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Application Information

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IPC IPC(8): B01J29/04B01J35/10B01J37/08B01J37/02C07C11/06C07C5/333
CPCC07C5/3337B01J29/043B01J37/0018B01J37/0201B01J2229/186B01J35/617B01J35/633B01J35/635B01J35/647C07C11/06Y02P20/52
Inventor 刘坚耿潭李响赵震韦岳长孙源卿宋卫余张潇李建梅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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