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Modified rare-earth-containing molecular sieve catalyst as well as preparation method and use thereof

A molecular sieve and catalyst technology, applied in the field of low-carbon olefin catalysts and their preparation, can solve the problems of low propylene selectivity, short catalyst life, low methanol conversion rate, etc., and achieve the effect of low reaction temperature

Active Publication Date: 2009-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved in the present invention is: in order to overcome the shortcomings of the low selectivity of propylene, the low conversion rate of methanol and the short catalyst life in the prior art, a modified rare earth-containing molecular sieve catalyst is provided so that it can be used in methanol and In the reaction of preparing low-carbon olefins with dimethyl ether as raw material, the selectivity of propylene and the conversion rate of methanol are high, and the catalyst life is long

Method used

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  • Modified rare-earth-containing molecular sieve catalyst as well as preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Take by weighing 100 grams of commercially available ZSM-5 molecular sieves (SiO 2 :Al 2 o 3 =80), added to 2000 grams of RECl 3 In the aqueous solution, RE represents the rare earths Ce and La, and the RECl in the aqueous solution 3 The mass content is 2%, CeCl 3 : LaCl 3 =2:1. Then stir, perform ion exchange at 95°C for 50 minutes, filter, and roast at 550°C for 2 hours, repeat the above steps once to obtain RE 2 o 3 RE-ZSM-5 seed crystals with a mass percent content of 21%.

[0078] Weigh 30 grams of the above-mentioned RE-ZSM-5 seed crystals and add them to 1800 grams of water glass solution; Na in the water glass solution 2 O mass content 3.6%, SiO 2 The mass content is 12%. Stir well, add 300 grams of 1.0% Al 2 o 3 Aluminum phosphate colloidal solution, adjust the pH value to 10.5 with a concentration of 8% phosphoric acid solution. The system was crystallized at 180°C for 20 hours, cooled, filtered, washed with water until neutral, and dried at 120°C...

Embodiment 2

[0088] Get the 2.2%RE that 100 grams of embodiment 1 prepares 2 o 3 RE-ZSM-5 molecular sieve, by molar ratio, SiO 2 :Al 2 o 3 =100,

[0089] Add 15 grams of alumina dry glue, mix well, and extrude into strips with a diameter of 3 mm. Dry at 120°C for 3 hours, and bake at 450°C for 4 hours. Prepare RE-HZSM-5 molecular sieve catalyst semi-finished product.

Embodiment 3

[0091] Take 10 grams of the RE-HZSM-5 molecular sieve catalyst semi-finished product prepared in Example 2, use 7 grams of magnesium acetate solution with a mass percentage of 10%, soak it at 60°C for 3 hours, dry it at 120°C for 3 hours, and use 100ml of water in the Steam treatment at 500°C for 3 hours, followed by calcination in air at 550°C for 6 hours, to prepare finished catalyst A. After analysis, the mass percentage of MgO in the catalyst was 1.9%.

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Abstract

The invention relates to a rare-earth-containing ZSM-5 molecular sieve catalyst modified with metallic oxide, which ensures high propylene selectivity, high methanol conversion rate and long life span of the catalyst in reaction which takes methanol and / or dimethyl ether as raw material to prepare low-carbon olefin. The catalyst consists of metallic oxide, binder and modified molecular sieves, wherein the metallic oxide accounts for 1 to 10 percent; the binder accounts for 5 to 30 percent; the modified molecular sieves account for 60 to 90 percent; and the modified molecular sieves contain rare earth oxide Ce2O3 and La2O3. The catalyst is used in the field of petrochemical industry.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for preparing low-carbon olefins rich in propylene, a preparation method and application thereof. Background technique [0002] Low-carbon olefins such as ethylene and propylene are the most important basic organic chemical raw materials, among which propylene is one of the products with the fastest growing demand in the world. Traditional crude oil-based production methods, such as naphtha cracking and refinery gas recovery of propylene, have struggled to meet the growing demand. The price of crude oil, which is the raw material for the production of low-carbon olefins such as ethylene and propylene, has skyrocketed, and it is facing a crisis of resource scarcity. Therefore, the development of other raw materials, such as coal and natural gas, to replace crude oil to produce ethylene and propylene technology has great development prospects. The process utilizes the existing mature indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C1/20C07C11/02
Inventor 吕顺丰刘博黄凤兴王世亮彭斌吴保军
Owner CHINA PETROLEUM & CHEM CORP
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