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ZSM-5 molecular sieve catalyst, preparation method and application thereof

A technology of ZSM-5 and molecular sieve, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of long production process and high rejection rate of catalyst production, and achieve short process, high selectivity and efficiency high effect

Active Publication Date: 2021-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process is long, and the catalyst production waste rate is high

Method used

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  • ZSM-5 molecular sieve catalyst, preparation method and application thereof
  • ZSM-5 molecular sieve catalyst, preparation method and application thereof
  • ZSM-5 molecular sieve catalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Dry base 70g ammonium type ZSM-5 molecular sieve (silicon aluminum molar ratio SiO 2 / Al 2 o 3 =150; ZSM-5 molecular sieve mean particle diameter is 1 micron) and 4g kale powder are mixed in the kneader, and in the kneader, adding the ammonium dihydrogen phosphate solution that is 40% by weight percentage concentration (with P 2 o 5 Accounting for molecular sieve dry basis weight 11.4%) and kneading for 30 minutes, then adding 45g of silica sol with a weight percentage concentration of 40% in the kneader to continue kneading into a dough shape, extruding into a cylindrical strip with a diameter of 1.7mm through a mold, The catalyst carrier was obtained by drying at 120°C and roasting at 550°C in an air atmosphere. The carrier was impregnated with an equal volume of magnesium nitrate solution (the MgO content accounted for 4.2% of the dry weight of the carrier), and then dried at 120°C and roasted at 500°C in an air atmosphere. ZSM-5 molecular sieve catalyst A with hi...

Embodiment 2

[0095] Dry base 77g ammonium type ZSM-5 molecular sieve (silicon aluminum molar ratio SiO 2 / Al 2 o 3 =150; ZSM-5 molecular sieve average particle diameter is 1.5 micron) and 5g scallop powder mixes in kneader, and adding weight percent concentration is 40% ammonium dihydrogen phosphate solution (in P 2 o 5 Accounting for 6.5% of molecular sieve dry basis weight) and kneading for 30 minutes, then adding 35g of silica sol with a concentration of 40% in the kneader to continue kneading into a dough shape, extruding into a cylindrical strip with a diameter of 1.7mm through a mold, The catalyst carrier was obtained by drying at 120°C and roasting at 550°C in an air atmosphere. The carrier was impregnated with an equal volume of magnesium nitrate solution (the MgO content accounted for 4.2% of the dry weight of the carrier), and then dried at 120°C and roasted at 500°C in an air atmosphere. ZSM-5 molecular sieve catalyst B with highly passivated outer surface. The composition o...

Embodiment 3

[0097] Dry base 70g ammonium type ZSM-5 molecular sieve (silicon aluminum molar ratio SiO 2 / Al 2 o 3 =150; ZSM-5 molecular sieve mean particle diameter is 1 micron) mixes in kneader with 5g kale powder, adds weight percent concentration in kneader and is the ammonium dihydrogen phosphate solution (with P 2 o 5 Accounting for molecular sieve dry basis weight 11.4%) and kneading for 30 minutes, then adding 45g of silica sol with a weight percentage concentration of 40% in the kneader to continue kneading into a dough shape, extruding into a cylindrical strip with a diameter of 1.7mm through a mold, The catalyst carrier was obtained by drying at 120°C and roasting in an air atmosphere at 550°C, and impregnating the carrier with an equal volume of magnesium nitrate solution (La 2 o 3 The content accounts for 4.2% of the weight of the dry basis of the carrier), and then the ZSM-5 molecular sieve catalyst C with a highly passivated outer surface is obtained by drying at 120° C....

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Abstract

The invention relates to a ZSM-5 molecular sieve catalyst, a preparation method and application thereof. The catalyst at least comprises a ZSM-5 molecular sieve, SiO2, a P element, and an alkaline earth metal element and / or a rare earth metal element; wherein the ZSM-5 molecular sieve has an outer surface with a covered acidic site, such that the ZSM-5 molecular sieve catalyst has a conversion rate of less than 5wt% of the 1, 3, 5-triisopropylbenzene cracking probe reaction. The catalyst can be used in industrial production of p-xylene.

Description

technical field [0001] The invention relates to a ZSM-5 molecular sieve catalyst, a preparation method and its application, in particular to a ZSM-5 molecular sieve catalyst whose outer surface is covered with acid sites, a preparation method and its application. Background technique [0002] The ten-membered ring pore size of ZSM-5 molecular sieve can effectively sieve p-xylene (PX) and other C8 isomers. In industrial production, the toluene shape-selective disproportionation of p-xylene and the toluene-methanol shape-selective methylation reaction all use the sieving function of the ten-membered ring channel of ZSM-5 molecular sieve. However, the acidity of the outer surface of the molecular sieve is unfavorable to the shape-selective function of the molecular sieve. In order to obtain a high concentration of PX, it is prevented from being converted into other C 8 Isomers, usually need to cover the acidity of the outer surface of ZSM-5 molecular sieve to reduce the side r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J35/10C07C2/86C07C15/08
CPCY02P20/52
Inventor 李旭光祁晓岚孔德金管卉
Owner CHINA PETROLEUM & CHEM CORP
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