A kind of Pt-based dehydrogenation catalyst with adjustable performance and method for improving its stability

A dehydrogenation catalyst and a stable technology, applied in the field of platinum-based dehydrogenation catalysts, can solve the problems of reduced catalyst activity, strong anti-carbon deposition ability, fast deactivation, etc., to improve selectivity, prolong service life, and promote carbon deposition Effect

Active Publication Date: 2019-03-26
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Targeting Pt-Sn / Al currently used for dehydrogenation of light alkanes 2 o 3 Catalyst, with the progress of propane dehydrogenation reaction in the process of use, the catalyst activity decreases and the shortcoming of deactivation is fast. The invention discloses a Pt-based dehydrogenation catalyst with adjustable performance, a preparation method and its stability The method makes the catalyst maintain stable catalyst activity during the dehydrogenation process of low-carbon alkanes, and at the same time has the advantages of slow deactivation and strong anti-coking ability.

Method used

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  • A kind of Pt-based dehydrogenation catalyst with adjustable performance and method for improving its stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Vector preparation. Mix a certain amount of aluminum oxide: silicon oxide mixed powder with a mass fraction of 1:1 and celadon powder accounting for 8% mass fraction of the mixed powder, and then add citric acid with a mass concentration of 5% and a mass concentration of 22% Dilute nitric acid for kneading, kneading time is 30min, and finally molding on the molding machine, the molded carrier is dried at room temperature for 8 hours, then dried at 120°C for 4 hours, and the dried carrier is finally roasted in a muffle furnace at 900°C After 6 hours, the final carrier A was obtained with a water absorption rate of 62.3%.

[0025]Mix 2ml of 0.2M chloroplatinic acid aqueous solution and 7.4ml of 0.18M stannous chloride hydrochloric acid solution evenly, and add hydrochloric acid and water to the above-mentioned Pt-Sn impregnating solution according to the saturated water absorption of the carrier used to make the final preparation The hydrochloric acid concentration of th...

Embodiment 2

[0032] Vector preparation. Mix a certain amount of aluminum oxide: silicon oxide mixed powder with a mass fraction of 5:1 and celadon powder accounting for 5% mass fraction of the mixed powder, and then add citric acid with a mass concentration of 5% and a mass concentration of 20% Knead with dilute nitric acid for 30 minutes, and finally shape it on a molding machine. After drying the molded carrier at room temperature for 8 hours, then dry it at 120°C for 4 hours. The dried carrier is finally roasted in a muffle furnace at 850°C After 12 hours, the final carrier B was obtained with a water absorption rate of 55.1%.

[0033] Mix 2ml of 0.2M chloroplatinic acid aqueous solution and 7.4ml of 0.18M stannous chloride hydrochloric acid solution evenly, and add hydrochloric acid and water to the above-mentioned Pt-Sn impregnating solution according to the saturated water absorption of the carrier used to make the final preparation The hydrochloric acid concentration of the impregn...

Embodiment 3

[0038] Vector preparation. Mix a certain amount of aluminum oxide: silicon oxide mixed powder with a mass fraction of 50:1 and scallop powder that accounts for 6% of the mixed powder mass fraction, and then add citric acid with a mass concentration of 5% and a mass concentration of 20% Knead with dilute nitric acid for 30 minutes, and finally shape it on a molding machine. After drying the molded carrier at room temperature for 8 hours, then dry it at 120°C for 4 hours. The dried carrier is finally roasted in a muffle furnace at 800°C. After 6 hours, the final carrier C was obtained with a water absorption rate of 58.6%.

[0039] Mix 2ml of 0.2M chloroplatinic acid aqueous solution and 7.4ml of 0.18M stannous chloride hydrochloric acid solution evenly, and add hydrochloric acid and water to the above-mentioned Pt-Sn impregnating solution according to the saturated water absorption of the carrier used to make the final preparation The hydrochloric acid concentration of the imp...

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Abstract

The present invention discloses a performance adjustable Pt-based dehydrogenation catalyst. The catalyst comprises the following components and contents: 0.1-1.0 wt% of Pt oxide serving as a main active component; one or more of Na, K, Ca, Zr, Sn, La and Ce as an aid agent, wherein the content of an oxide of an element of the aid agent is 0.01-10 wt%; and the balance of a carrier. The present invention also provides a method for improving activity and stability of the catalyst in a reaction process of light alkane dehydrogenation. According to the change for catalytic activity, in the method, an adjustment gas for stabilizing the catalytic activity is added into a reaction system; the adjustment gas consists of adjustment components and dilution components, wherein the adjustment components are gases of one or more elements in the VIIA element, and the content of the adjustment components is 0.001-1 v%; the dilution components are one or more gases of water vapor, air, nitrogen, methane or ethane gas. According to the method provided by the present invention, in the reaction process, the active component Pt can be dispersed, the catalyst deactivation is slowed down, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to the field of dehydrogenation catalysts, in particular to a platinum-based dehydrogenation catalyst with adjustable performance and a method for improving the activity and stability of the catalyst. Background technique [0002] Propylene is an important organic chemical raw material, and its main source is the by-products of traditional oil refining processes such as steam cracking and catalytic cracking. Therefore, the production of propylene is subject to the production of the main products ethylene and refined oil. The propylene output of the current traditional process cannot meet the market demand for propylene, and the market gradually pays attention to the new alternative production process of propylene, including propane dehydrogenation (PDH), methanol to olefins (MTO, MTP), deep catalytic cracking (DCC), olefin cracking and olefin disproportionation and other five processes. In comparison, the advantages of propane de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62C07C5/333C07C11/06
CPCY02P20/52
Inventor 蔡奇吴青杨玉旺孙彦民王栋于海斌徐振领吴同旭郭秋双
Owner CHINA NAT OFFSHORE OIL CORP
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