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Low-carbon alkane dehydrogenation olefin preparation catalyst and preparation method thereof

A technology for low-carbon alkanes and low-carbon olefins, which is applied in the field of catalysts for dehydrogenation of low-carbon alkanes to olefins and their preparation, and can solve problems such as unfavorable environmental friendliness and the like

Active Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the active component of the catalyst, chromium, is a toxic metal, which is not conducive to environmental friendliness.

Method used

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  • Low-carbon alkane dehydrogenation olefin preparation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Weigh 50g of ammonium phosphate, dissolve it in 200mL of deionized water to obtain solution A; grind 100g of petroleum coke into powder, then add it to solution A, let it stand for 1.5h, then filter, and put the obtained solid sample in an oven at 110°C Dry for 5h. At 200°C, pretreat the dried solid sample with water vapor for 3 hours (the volumetric space velocity of the water vapor gas is 500 hours -1 ), then raise the temperature to 400°C, continue pretreatment for 3h, and then cool to 60°C under nitrogen protection to obtain pretreated petroleum coke.

[0066] Mix 8g of cetyltrimethylammonium bromide, 40g of citric acid and 200g of deionized water evenly to obtain solution B, weigh 22.25g of tetraethyl orthosilicate, and mix it with the above-mentioned pretreated petroleum coke and solution B Mix evenly, stir for 4 hours, and dry the obtained colloid at 120° C. for 4 hours to obtain silicon-based modified petroleum coke.

[0067] Weigh 31.45g ferric nitrate and 1....

Embodiment 2

[0071] Weigh 50g of ammonium phosphate, dissolve it in 200mL of deionized water to obtain solution A; grind 100g of petroleum coke into powder, then add it to solution A, let it stand for 1.5h, then filter, and put the obtained solid sample in an oven at 110°C Dry for 5h. At 200°C, pretreat the dried solid sample with water vapor for 3 hours (the volumetric space velocity of the water vapor gas is 800 hours -1 ), then raise the temperature to 400°C, continue pretreatment for 3h, and then cool to 60°C under nitrogen protection to obtain pretreated petroleum coke.

[0072] Mix 8g glutaric acid, 40g hydrochloric acid (concentration 1.5moL / L) and 230g deionized water evenly to obtain solution B, weigh 22.25g tetraethyl orthosilicate, and mix with the above-mentioned pretreated petroleum coke and solution B Evenly, stir for 4 hours, and dry the obtained colloid at 120° C. for 4 hours to obtain silicon-based modified petroleum coke.

[0073] Weigh 11.3g of potassium permanganate a...

Embodiment 3

[0077] Weigh 50g of ammonium phosphate, dissolve it in 200mL of deionized water to obtain solution A; grind 100g of petroleum coke into powder, then add it to solution A, let it stand for 1.5h, then filter, and put the obtained solid sample in an oven at 110°C Dry for 5h. At 200°C, pretreat the dried solid sample with water vapor for 3 hours (the volumetric space velocity of the water vapor gas is 1200 hours -1 ), then raise the temperature to 400°C, continue pretreatment for 3h, and then cool to 60°C under nitrogen protection to obtain pretreated petroleum coke.

[0078] Mix 8g of dodecylamine, 40g of absolute ethanol and 230g of deionized water uniformly to obtain solution B, weigh 22.25g of tetraethyl orthosilicate, mix with the above-mentioned pretreated petroleum coke and solution B, stir for 4h, Solid-liquid separation, the resulting solid was washed with deionized water until the filtrate became neutral, and then dried at 120°C for 4 hours to obtain silicon-based modif...

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Abstract

The invention discloses a low-carbon alkane dehydrogenation olefin preparation catalyst and a preparation method of the catalyst. The catalyst comprises an active component, an auxiliary agent and a carrier, the active component is one or more of Fe, Co, Ni, V, Mo, Cr, Mn, Cu or Zn, the auxiliary agent is one or more of IA group, IIA group, rare earth elements, Al, Ti, Zr, Nb and Ga, and the carrier is silicon-based modified petroleum coke-based activated carbon. The preparation method comprises the following steps: (1) pretreating petroleum coke; (2) preparing silicon-based modified petroleumcoke; (3) preparing a composite oxide containing an active component and an auxiliary agent; (4) uniformly mixing the silicon-based modified petroleum coke, the composite oxide and an activating agent, and activating same; and washing and drying the sample obtained in the step (4) to obtain the catalyst. The prepared catalyst has the advantages of good active component dispersion, high utilization rate, high low-carbon olefin selectivity and the like.

Description

technical field [0001] The invention belongs to the field of chemical catalysis, and relates to a catalytic material and a preparation method thereof, in particular to a catalyst for dehydrogenating low-carbon alkanes to olefins and a preparation method thereof. Background technique [0002] Low-carbon olefins usually refer to olefins with less than or equal to 4 carbon atoms, which are very important organic chemical raw materials. Ethylene is a very important intermediate in petrochemical industry and the basic raw material of modern petrochemical industry. Propylene is an important chemical raw material, which can be used to synthesize materials such as polypropylene, polyacrylonitrile, acrolein, acrylic acid and propylene oxide, as well as to produce plastics, polypropylene fiber, organic glass, epoxy resin and other products. Isobutene is currently mainly used for the synthesis of gasoline additive methyl tert-butyl ether (MTBE), in addition to the production of isopre...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/755B01J23/34B01J23/22B01J23/78C07C5/333C07C11/04
CPCB01J23/83B01J23/755B01J23/34B01J23/22B01J23/78B01J23/002C07C5/3332B01J2523/00B01J2523/3712B01J2523/41B01J2523/842B01J2523/847B01J2523/48B01J2523/13B01J2523/17B01J2523/55C07C11/04Y02P20/52
Inventor 孙晓丹宋永一张舒冬张庆军刘继华方向晨
Owner CHINA PETROLEUM & CHEM CORP
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