Mixed C3/C4 alkane dehydrogenation catalyst and preparation method thereof

A dehydrogenation catalyst and catalyst technology are applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., and can solve the problems of low activity of mixed low-carbon alkane dehydrogenation catalysts.

Active Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of the technical problems to be solved by the present invention is the low activity of mixed low-carbon alkane dehydrogenation catalysts in the prior art, and a new catalyst for mixed low-carbon alkane dehydrogenation is provided

Method used

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  • Mixed C3/C4 alkane dehydrogenation catalyst and preparation method thereof
  • Mixed C3/C4 alkane dehydrogenation catalyst and preparation method thereof
  • Mixed C3/C4 alkane dehydrogenation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 2 grams of SiO with a Si / Al ratio of 150 2 Carrier, add 10ml deionized water, pipette 0.18ml H 2 PtCl 6 Solution, 1.80 ml of SnCl 4 Solution, 3ml NaNO 3 Solution and 2.5 ml H 8 MoN 2 O 4 Adjust the pH value of the solution to 1.5 with 2.5% ammonia water, then immerse the sample in a water bath at 80°C for 1 hour, remove the sample for filtration, dry it in an oven at 120°C for 8 hours, and then place the sample in a muffle furnace at 550°C. Calcined at ℃ for 4 hours to obtain the desired catalyst. The mixed gas of propane and isobutane is adjusted flow through the mass flow meter, enters the pre-heating zone for mixing, and then enters the reaction zone. The pre-heating zone and reaction zone of the reactor are heated by electric heating wires to reach the predetermined temperature. The inner diameter is Ф9mm—Ф6mm stainless steel casing, about 400mm long. After the reacted gas passes through the condensing tank, it enters the gas chromatography to analyze its compo...

Embodiment 2

[0034] Weigh 2 grams of SiO with a Si / Al ratio of 150 2 Carrier, add 10 ml of deionized water, pipette 9 ml of H 2 PtCl 6 Solution, 7.2 ml of SnCl 4 Solution, 0.53 ml of KNO 3 Solution and 2.0 ml Nb(AC) 5 For the solution, adjust the pH of the solution to 1 with 2.5% ammonia water, and then immerse in a water bath at 80°C for 1 hour, then take out the sample for filtration, dry it in an oven at 120°C for 8 hours, and then put the sample in a muffle furnace at 560°C Calcined at ℃ for 4 hours to obtain the desired catalyst.

[0035] The catalyst evaluation conditions in the isothermal fixed-bed reactor are as follows: 0.5g of catalyst is loaded into the above-mentioned isothermal fixed-bed reactor (the height of the catalyst bed is about 17mm), the reaction pressure is normal pressure, and the gas space velocity is 600 hours. -1 , The reaction temperature is 560℃. The results are shown in Table 1.

Embodiment 3

[0037] Weigh 2 grams of SiO with a Si / Al ratio of 150 2 Carrier, add 10 ml of deionized water, pipette 18 ml of H 2 PtCl 6 Solution, 6 ml of Fe(NO 3 ) 3 Solution, 30 ml of NaNO 3 Solution and 1.5 ml Ta(AC) 5 Adjust the pH of the solution to 3.5 with 2.5% ammonia water, and then immerse it in a water bath at 80°C for 1 hour, then remove the sample for filtration, dry it in an oven at 120°C for 8 hours, and then put the sample in a muffle furnace at 560°C. Calcined at ℃ for 4 hours to obtain the desired catalyst.

[0038] The catalyst evaluation conditions in the isothermal fixed-bed reactor are as follows: 0.5g of catalyst is loaded into the above-mentioned isothermal fixed-bed reactor (the height of the catalyst bed is about 17mm), the reaction pressure is normal pressure, and the gas space velocity is 600 hours. -1 , The reaction temperature is 560℃. The results are shown in Table 1.

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Abstract

The invention relates to a mixed low-carbon alkane dehydrogenation catalyst and a preparation method thereof, which mainly solves the problem of low activity of the dehydrogenation catalyst prepared in the prior art. The present invention adopts a catalyst for mixed low-carbon alkane dehydrogenation, which comprises the following components in weight percentage: a) 0.1-10% Pt, Pd element or their oxides; b) 0.25-10% Sn , Fe, Ni elements or their oxides; c) 0.1-10% of Na, Li, K elements or their oxides; d) 0-10% of Nb, Mo, Ta, W elements or their oxides; e) The technical scheme of ZSM-5 with different Si / Al ratios of 70-99% can solve this problem well, and can be used in the industrial production of low-carbon olefins by dehydrogenation of mixed light alkanes.

Description

Technical field [0001] The invention relates to a catalyst for the dehydrogenation of mixed low-carbon alkanes and a preparation method thereof. Background technique [0002] Propylene and isobutylene, as low-carbon olefins second only to the amount of ethylene, are widely used in the chemical industry. Among them, propylene is mainly used to produce polypropylene, acrylonitrile, propylene oxide, isopropanol, phenol and acetone, and isobutylene is mainly used For the preparation of methyl methacrylate, butyl rubber, polybutene, tert-butylamine, diisobutylene, etc. However, the current output of propylene and isobutylene cannot meet the increasing demand. During the 12th Five-Year Plan period, the annual demand growth rate of propylene is expected to reach 4.8%. my country needs to import 5 million tons of propylene each year. Therefore, it is necessary to explore new sources of low-carbon olefins. With the development of the refining industry at home and abroad, the deep process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48B01J29/44C07C5/333C07C11/06C07C11/09
CPCY02P20/52
Inventor 吴省缪长喜姜冬宇刘瑞丹吴文海樊志贵
Owner CHINA PETROLEUM & CHEM CORP
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