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Dehydrogenation catalyst reduction method

A dehydrogenation catalyst, supported catalyst technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. question

Active Publication Date: 2012-03-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduction can make the active components of the catalyst into a single metal state, and can also ensure the dispersion of the metal component particles. However, constant temperature reduction at a higher temperature will easily cause the sintering of the metal particles, making the reduced catalyst metal particles larger, resulting in The exposed elemental Pt has a small surface area, which ultimately leads to lower activity and selectivity of the catalyst

Method used

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preparation example Construction

[0014] The dehydrogenation catalyst can be prepared by a conventional method, such as using an impregnation method to support the dehydrogenation active metal, and the auxiliary agent can be introduced during the preparation of the alumina carrier and / or by an impregnation method.

[0015] In the dehydrogenation catalyst reduction method of the present invention, a specific dehydrogenation catalyst uses Sn-containing alumina as a carrier, and the dehydrogenation active metal component is generally selected from one or more of platinum, palladium, iridium, rhodium or osmium in the platinum group. There are several types, and the dosage is 0.01% to 2% of the weight of the carrier in terms of simple substances. The content of Sn is 0.1%-10% of the weight of the carrier in terms of simple substance. In the dehydrogenation catalyst with Sn-containing alumina as the carrier, Sn is introduced into the Sn-containing material when the alumina is gelled, and then made into a carrier. T...

example 1

[0033] Preparation of Sn-containing alumina support. After mixing a certain amount of 0.98M aluminum trichloride solution and 0.01M tin tetrachloride solution, add an appropriate amount of ammonia water with a mass concentration of 8%, mix evenly in a neutralization tank at 60-80°C, and control the pH value 7.0~9.0, after filtering, washing with water and acidifying, pressurize into spheres in oily ammonia column, dry, age, and roast at 650~750°C for 4 hours to obtain alumina pellets containing 0.3wt% Sn.

[0034] The alumina pellet carrier containing 0.3% Sn was calcined at 800°C for 3h, the calcined carrier was immersed in an aqueous solution containing chloroplatinic acid for 6h at 70°C, dried at 120°C for 2h, and calcined at 500°C for 4h. Then activate in air containing water vapor for 4h. Then at 70°C with KNO 3 Soaked in aqueous solution for 2h, dried and roasted under the same conditions. The loading amount of each component in the catalyst is: Pt 0.5wt%, Sn 0.3wt%, ...

example 2

[0046] Preparation of Sn-containing alumina support. After mixing a certain amount of 1.08M aluminum trichloride solution and 0.01M tin tetrachloride solution, add a certain amount of 10% ammonia water, mix evenly in a neutralization tank at 60-80°C, and control the pH value from 7.0 to 9.0, after filtering, washing with water and acidifying, pressurize into spheres in an oily ammonia column, dry, age, and roast at 650-750°C for 4 hours to obtain alumina pellets containing 1.0wt% Sn.

[0047] The alumina pellet carrier containing 1.0% Sn was calcined at 800°C for 3h, and the calcined carrier was immersed in an aqueous solution containing chloroplatinic acid for 4h at 70°C, dried at 120°C for 2h, and calcined at 500°C for 4h. Activation in air containing water vapor for 4h. Then at 70°C with KNO 3 Soaked in aqueous solution for 2 hours, dried and roasted under the same conditions, 400 ~ 550 ° C temperature program reduction, the heating rate is 2 ° C / min. The loading amoun...

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Abstract

The invention discloses a dehydrogenation catalyst reduction method. Dehydrogenation catalyst is platinum family loading catalyst and is in programmed temperature rising reduction before being used, the programmed temperature rising reduction is performed within a temperature range between 350 DEG C and 600 DEG C, and temperature rising speed ranges from 0.5 DEG C / min to 10 DEG C / min. In an activating process of the dehydrogenation catalyst, after platinum-base catalyst is prepared by a conventional method, conventional constant-temperature reduction operation is omitted, a programmed temperature-rising reduction method is utilized to realizing activation reduction for the catalyst, so that metal particles of the catalyst after being in reduction are dispersed more uniformly, sizes of theparticles are proper, and surface area of exposed elementary substance Pt is enlarged. Accumulation of activated metal of the catalyst due to deep reduction of dehydrogenation activated metal is avoided, deep reduction of addition agent components which do not need reduction can also be avoided, accordingly, service performances of the catalyst are improved, and particularly, selectivity of objective products and stability of long-term reaction are improved.

Description

technical field [0001] The invention relates to a reduction method of a catalyst for the catalytic dehydrogenation of low-carbon alkanes to olefins, in particular to a reduction method for a catalyst for the dehydrogenation of C3-C4 alkanes to olefins. Background technique [0002] Since the beginning of the new century, the demand for petrochemical raw materials and petrochemical products in the world will continue to grow, and the demand for propylene as a basic petrochemical raw material will continue to grow. However, the production capacity of conventional steam cracking and FCC technology cannot meet the rapidly growing demand for propylene, causing the market to emerge a global shortage. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has changed from purely relying on petroleum as a raw material to diversifying the technical route of raw material sources, especially the technical route of producing olefins from low-carbon al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/18B01J37/20B01J23/62C07C5/333C07C11/06
CPCY02P20/52
Inventor 张海娟李江红张喜文宋喜军孙潇磊
Owner CHINA PETROLEUM & CHEM CORP
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