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Catalyst for dehydrogenating alkanes to olefins and its preparation and dehydrogenation method

A catalyst and a technology for producing olefins, which are used in catalyst activation/preparation, chemical instruments and methods, catalysts, etc., can solve problems such as unsatisfactory long-term stability, unsatisfactory catalytic selectivity, easy carbon deposition, etc., to meet the needs of production technology , good conversion rate, the effect of improving stability

Active Publication Date: 2022-02-25
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 dehydrogenating alkanes to olefins and its preparation and dehydrogenation method
  • Catalyst for dehydrogenating alkanes to olefins and its preparation and dehydrogenation method
  • Catalyst for dehydrogenating alkanes to olefins and its preparation 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 specifically discloses a method for preparing a catalyst for alkane dehydrogenation to olefins. The compound raw materials that can provide B, P, S, and N elements are recrystallized in a solvent, and then the recrystallized product is In an ammonia-containing atmosphere, the temperature is raised to 700-1000°C at a heating rate greater than or equal to 5°C / min, and heat preservation is carried out to obtain the catalyst; in the compound raw materials, S: B element moles The ratio is greater than or equal to 10; the P:B element molar ratio is greater than or equal to 0.5; the N:B element molar ratio is greater than or equal to 10. The invention also includes the catalyst prepared by the preparation method and the application of the catalyst in the direct or oxidative dehydrogenation of alkanes to prepare alkenes. Based on the preparation method, the present invention can obtain a special catalyst, and the catalyst has good conversion rate, and simultaneously has 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 Patents(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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