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Graphene-based desulfurization catalyst and preparation thereof, and desulfurization method of low-carbon alkane catalytic dehydrogenation byproduct hydrogen

A desulfurization catalyst, graphene-based technology, applied in the gas phase removal of sulfides in hydrocarbon raw materials, and the field of gas desulfurization, can solve the problems of poor removal accuracy, unsatisfactory removal effect, low sulfur capacity, etc., to avoid Harm, the effect of improving economic suitability

Active Publication Date: 2022-05-31
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used gas phase desulfurizers have a good effect on the removal of hydrogen sulfide, but the removal effect on organic sulfide at room temperature is not ideal, and its sulfur capacity is low, and the removal accuracy is poor.

Method used

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  • Graphene-based desulfurization catalyst and preparation thereof, and desulfurization method of low-carbon alkane catalytic dehydrogenation byproduct hydrogen

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Embodiment 1

[0060] The present embodiment provides a graphene-based desulfurization catalyst, which is prepared according to the preparation method comprising the following specific steps:

[0061] First measure 8mL of graphene oxide aqueous solution prepared with a graphene oxide concentration of 0.3g / mL, and weigh 30mL of spherical 13X molecular sieve and place it in a container, then add the graphene oxide aqueous solution to spherical 13X molecular sieve, Then, under the condition of power of 50W, ultrasonic for 10s, continue to stir for 30min, and finally filter, dry at 110°C for 3h, and roast at 550°C for 3h in a nitrogen atmosphere to obtain a graphene-based desulfurization catalyst, which is denoted as desulfurization catalyst A. The total weight of the desulfurization catalyst A is 100%, and it is composed of 16wt% graphene oxide and 84wt% spherical 13X molecular sieve.

Embodiment 2

[0063] The present embodiment provides a graphene-based desulfurization catalyst, which is prepared according to the preparation method comprising the following specific steps:

[0064] First, measure 6mL of the graphene oxide aqueous solution with a graphene oxide concentration of 0.6g / mL, and weigh 30mL of NaY molecular sieve and place it in a container, then add the graphene oxide aqueous solution to the NaY molecular sieve, and then use a power of Under the condition of 60W, it was ultrasonicated for 8s and then stirred for 40min. Finally, it was filtered, dried at 100°C for 4h, and roasted at 500°C for 4h in a nitrogen atmosphere to obtain a graphene-based desulfurization catalyst, which was denoted as desulfurization catalyst B. The total weight is 100%, and it is composed of 50wt% graphene oxide and 50wt% NaY molecular sieve.

Embodiment 3

[0066] This embodiment provides a desulfurization method for producing isobutene by-product hydrogen by catalytic dehydrogenation of isobutane, wherein the desulfurization method includes the following specific steps:

[0067] The sulfur content of the effluent from the PSA reactor of the isobutane catalytic dehydrogenation to isobutene unit is 4mg / Nm 3 The by-product hydrogen is passed into the desulfurization tower filled with desulfurization catalyst A, at 25°C, 0.8MPa, and the feed volume space velocity is 800h -1 Catalytic desulfurization of the by-product hydrogen gas under certain conditions to remove carbonyl sulfide and thiophene in the hydrogen gas, real-time analysis of the sulfur content change in the hydrogen gas at the outlet of the desulfurization tower, when the sulfur content in the hydrogen gas at the outlet of the desulfurization tower is greater than 0.1mg / Nm 3 , it is considered that the desulfurization catalyst A breaks through, and the desulfurization ca...

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Abstract

The invention provides a graphene-based desulfurization catalyst, a preparation method thereof and a desulfurization method of low-carbon alkane catalytic dehydrogenation byproduct hydrogen, and the graphene-based desulfurization catalyst comprises 5-55 wt% of graphene and 45-95 wt% of a molecular sieve based on the total weight of 100%. According to the desulfurization method, the activated graphene-based desulfurization catalyst is used for carrying out catalytic desulfurization treatment on the low-carbon alkane catalytic dehydrogenation byproduct hydrogen so as to remove sulfides in the hydrogen. According to the method provided by the invention, inorganic sulfur and organic sulfide in hydrogen can be removed at the same time, the desulfurization process of catalytic dehydrogenation byproduct hydrogen can be simplified, and the desulfurization efficiency of the desulfurizer is effectively improved. Besides, the graphene-based desulfurization catalyst provided by the invention only uses graphene as an active component, and any auxiliary agent does not need to be added, so that the harm to downstream catalyst components caused by the auxiliary agent introduced into the desulfurization agent can be avoided.

Description

technical field [0001] The invention relates to a graphene-based desulfurization catalyst and its preparation and a desulfurization method for by-product hydrogen by catalytic dehydrogenation of low-carbon alkanes, belonging to the technical field of gas desulfurization, and more specifically to the technical field of gas-phase removal of sulfide in hydrocarbon raw materials. Background technique [0002] The method of preparing propylene from cheap propane has become one of the most important technical means to meet the growth of propylene. [0003] In the process of propane dehydrogenation to propylene, while the product propylene is obtained, the same molar amount of hydrogen is by-produced, and the hydrogen is mixed in the mixed tail gas of ethane, ethylene, carbon monoxide, sulfide, chloride, methane, etc. The sulfides in the dehydrogenation reaction gas are the reaction products of organic sulfides added to the low-carbon alkane raw materials under high temperature con...

Claims

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Application Information

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IPC IPC(8): B01J29/08C01B3/58
CPCB01J29/082B01J29/084C01B3/58C01B2203/045C01B2203/0485Y02P20/584
Inventor 李永峰姜伟丽杨帆周广林李芹
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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