Method for modifying rare earth of molecular sieve

A technology of rare earth modification and molecular sieve, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve high dispersion, improve stability, and prevent agglomeration

Inactive Publication Date: 2012-10-24
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The above research is to first synthesize binary hydrotalcite, and then prepare a catalyst with a single active component, but in some reactions that require the simultaneous presence of multiple active components, the above method obviously has shortcomings

Method used

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  • Method for modifying rare earth of molecular sieve
  • Method for modifying rare earth of molecular sieve
  • Method for modifying rare earth of molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Add 5g of USY molecular sieve into 50ml of deionized water, stir evenly at 40°C, add 7.437g of zinc nitrate, 1.84g of lanthanum nitrate, and 3.19g of aluminum nitrate in sequence, stir for 0.5 hours after mixing, and add 1mol / L of Sodium hydroxide solution, adjust the pH value of the system to 6, stir for 4 hours under this condition, transfer to a high-pressure reactor, crystallize at 85°C for 24 hours, filter, wash and dry to obtain a Zn-Al-La / USY composite The material was heated at 1°C / min to 550°C, and calcined at this temperature for 2 hours to obtain a La-modified USY molecular sieve. marked as a.

Embodiment 2

[0068] Add 5g of USY molecular sieve into 50ml of deionized water, stir evenly at 20°C, add 7.437g of zinc nitrate, 2.71g of lanthanum nitrate, and 2.34g of aluminum nitrate in sequence, mix and stir for 0.5 hours, and add 1mol / L hydrogen at a rate of 1ml / min Sodium oxide solution, adjust the pH value of the system to 6, stir under this condition for 6 hours, transfer to a high-pressure reactor, crystallize at 85°C for 24 hours, filter, wash and dry to obtain a Zn-Al-La / USY composite material , the temperature was raised to 550° C. at 2° C. / min, and calcined at this temperature for 2 hours to obtain La-modified USY molecular sieves. marked b.

Embodiment 3

[0070] Add 5g of USY molecular sieve into 50ml of deionized water, stir evenly at 20°C, add 13.73g of zinc nitrate and 2.67g of lanthanum nitrate in sequence, mix and stir for 0.5 hours, add 2mol / L sodium hydroxide solution at a speed of 0.1ml / min, Adjust the pH value of the system to 6, stir for 6 hours under this condition, transfer to a high-pressure reactor, crystallize for 24 hours at 85°C, and obtain the Zn-Al-La / USY composite material after suction filtration, washing and drying, / min to 550°C, and calcined at this temperature for 2 hours to obtain La-modified USY molecular sieves. marked c.

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Abstract

The invention relates to a method for modifying rare earth of a molecular sieve, which is characterized in that an aluminum source on the molecular sieve surface is used, Zn(Mg)/Al/La(Ce) ternary hydrotalcite is subjected to in situ synthesis, The synthesized hydrotalcite material comprises the following components: (1-50)zinc salt(magnesium salt): (1-50)aluminum salt: (10-100)H2O: rare earth compound. A program temperature-raising calcination method is used, P2O5, La2O3 or Ce2O3 is highly dispersed on the surface and tunnel of the molecular sieve, thereby the acidity of the molecular sieve is enhanced. The USY molecular sieve modified by using a hydrotalcite precursor method is used to prepare a mode catalyst, compared with the mode catalyst prepared by the USY molecular sieve modified by using a dipping method, the MAT index is increased by 3.58%, the gas yield is decreased by 0.21%, the gasoline yield is increased by 1.59% and the carbon deposit is decreased by 0.63%.

Description

technical field [0001] The invention relates to a rare earth modification method of a molecular sieve, in particular to a rare earth modification method in which a hydrotalcite precursor is produced in a molecular sieve. Background technique [0002] The availability of conventional petroleum resources is decreasing day by day, and the processing of heavy oil and residual oil is receiving more and more attention. Heavy oil is characterized by large molecules and complex molecular structures. Moreover, heavy oil is enriched with most of the sulfur, nitrogen and metal compounds in crude oil. These compounds are not only difficult to crack and easy to form coke, but also deposited on the surface of the catalyst are very easy to poison the catalyst and lose its activity. [0003] Based on the above characteristics of heavy oil, the selection of molecular sieve type and the modification of molecular sieve are very important in heavy oil catalytic cracking, which are directly rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08B01J29/70C10G11/05
Inventor 刘洪涛刘宏海高雄厚石永刚王坤赵红娟张莉王宝杰赵晓争熊晓云胡清勋
Owner PETROCHINA CO LTD
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