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Catalyst for preparing olefin through alkane dehydrogenation and preparation thereof, and dehydrogenation method

An alkane dehydrogenation and catalyst technology, which is applied in catalyst activation/preparation, chemical instruments and methods, catalysts, etc., can solve the problems of easy carbon deposition, unsatisfactory long-term stability, unsatisfactory catalytic selectivity, etc., and achieve improved stability. , to meet the needs of production technology, the effect of good conversion rate

Active Publication Date: 2021-08-03
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at technical problems such as unsatisfactory catalytic selectivity, easy carbon deposition, and unsatisfactory long-term stability existing in the existing catalyst for alkane dehydrogenation to olefins (the present invention is also referred to as catalyst), the first purpose of the present invention is to provide an alkane dehydrogenation A method for the preparation of hydrogen-to-olefins catalysts aimed at improving product selectivity, carbon deposition resistance and long-term stability while maintaining good conversion

Method used

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  • Catalyst for preparing olefin through alkane dehydrogenation and preparation thereof, and dehydrogenation method
  • Catalyst for preparing olefin through alkane dehydrogenation and preparation thereof, and dehydrogenation method
  • Catalyst for preparing olefin through alkane dehydrogenation and preparation thereof, and dehydrogenation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Take a certain amount of boric acid (boron source, 0.4g), thiourea (sulfur source and nitrogen source), hydroxyethylidene diphosphonic acid (phosphorus source), in the raw material, the molar ratio of B:N:S:P is 1 :90:48:1.2), add 40mL of distilled water, stir to dissolve, and then recrystallize the beaker containing the precursor solution in an oil bath at 80°C and stirring at 300rpm until there is no obvious moisture, and then the obtained white The recrystallized product was transferred to a vacuum oven at 50°C for further drying for 12 hours. Grind the dried recrystallized product into powder, put it into a corundum ark, place it in a tube furnace, feed 60mL / min of ammonia gas to provide a roasting atmosphere, and raise the temperature from room temperature to 800°C at a heating rate of 5°C / min Roast for 3 hours, then cool down to room temperature naturally under the protection of ammonia gas (the flow rate of ammonia gas is 20mL / min) to obtain the catalyst, record:...

Embodiment 2

[0087] Compared with Example 1, the only difference is that the composition of the sulfur source was changed, and ammonium thiosulfate and ammonium sulfate were used for research respectively. Wherein, when ammonium thiosulfate was used as the sulfur source, urea was used as a supplementary nitrogen source, and urea was used as a supplementary nitrogen source. The ratio of control B:N remains unchanged, and other parameters and operations are the same as in Example 1.

[0088] Adopt the catalyst performance testing method among the embodiment 1, record the performance of catalyst as shown in table 1:

[0089] Table 1:

[0090]

[0091]

Embodiment 3

[0093] Compared with Example 1, the only difference is that the molar ratio of the sulfur source is changed, respectively, the molar ratios of B:S are 1:16, 1:20, 1:24, 1:28, and urea is used to supplement nitrogen Source, to keep B:N unchanged, in addition, the molar ratio of B:S is 1:60 in the case, no additional urea is added as a nitrogen source; other parameters and operations are the same as in Example 1.

[0094] Adopt the catalyst performance test method in embodiment 1, record the performance of catalyst as shown in table 2:

[0095] Table 2

[0096]

[0097] a: No additional urea was added.

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Abstract

The invention belongs to the technical field of catalytic dehydrogenation, and particularly discloses a preparation method of a catalyst for preparing olefin through alkane dehydrogenation, which comprises the following steps of: recrystallizing a compound raw material capable of providing elements B, P, S and N in a solvent, heating the recrystallized product to 700-1000 DEG C in an ammonia-containing atmosphere at a heating rate of greater than or equal to 5 DEG C / min, and carrying out heat preservation roasting to obtain the catalyst. In the compound raw material, the molar ratio of S to B is greater than or equal to 10; the molar ratio of P to B is greater than or equal to 0.5; and the molar ratio of N to B is greater than or equal to 10. The invention also relates to a catalyst prepared by the preparation method and application of the catalyst in preparation of olefin by direct or oxidative alkane dehydrogenation. Based on the preparation method, a special catalyst can be obtained, and the catalyst has good conversion rate and excellent product selectivity and stability.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a catalyst for preparing alkenes by dehydrogenating alkanes and a dehydrogenation method. Background technique [0002] Olefins are important chemical raw materials. For example, styrene, as a derivative of aromatic hydrocarbons, is an important monomer raw material for the production of high polymers in the chemical industry, and is widely used in fields closely related to people's daily life. It is estimated that the annual industrial output value related to styrene can reach 60 billion US dollars. In the past 20 years, with the continuous development of the global styrene downstream product market, the demand for styrene has increased year by year. Although the production capacity of styrene is affluent from the international market, my country is one of the countries with the fastest growth rate of styrene demand, and the styrene self-sufficiency rate is still a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08C07C5/333C07C15/46
CPCB01J27/24B01J37/08C07C5/333C07C2527/24B01J35/647B01J35/615C07C15/46Y02P20/52
Inventor 周永华林百宁徐凡刘雨薇仇普文王华伟王雷王宁
Owner CENT SOUTH UNIV
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