Modified Y-type molecular sieve and preparation method thereof

A molecular sieve and modification technology, used in molecular sieve catalysts, molecular sieves and alkali exchange compounds, chemical instruments and methods, etc., can solve the problems of zeolite structure damage, zeolite crystallinity decline and other problems, achieve less lattice defects, excellent stability, Good effect of structural hydrothermal stability and active hydrothermal stability

Active Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The above patent documents increase the silicon-aluminum ratio of the Y-type molecular sieve by hydrothermal dealumination and / or chemical dealumination, and undergo secondary hydrothermal calcination to realize the shrinkage of the unit cell, but in the case of deep dealumination (SiO 2 / Al 2 Molar ratio ≥ 15) process often leads to the destruction of zeolite structure, so that the crystallinity of zeolite decreases

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  • Modified Y-type molecular sieve and preparation method thereof
  • Modified Y-type molecular sieve and preparation method thereof
  • Modified Y-type molecular sieve and preparation method thereof

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preparation example Construction

[0034] In the preparation method provided by the present invention, the phosphorus-containing substance in the phosphorus-containing exchange liquid is selected from one of orthophosphoric acid, phosphorous acid, pyrophosphoric acid, ammonium phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, and aluminum phosphate. or more.

[0035] The ammonium-containing substance in the ammonium solution is selected from one or more of ammonium chloride, ammonium nitrate, ammonium carbonate, ammonium bicarbonate, ammonium oxalate, ammonium sulfate, and ammonium bisulfate.

[0036] The rare earth-containing substance in the rare earth-containing exchange liquid is selected from one or more of lanthanum oxide, cerium oxide, lanthanum nitrate, cerium nitrate, lanthanum chloride, cerium chloride, mixed rare earth nitric acid, and mixed rare earth chloride.

[0037] The inorganic acid for adjusting the pH value of the exchange solution is selected from one or more of hydro...

Embodiment 1

[0064] NaY zeolite is used as raw material for exchange with ammonium sulfate solution, the treatment conditions are: NaY molecular sieve (dry basis): ammonium sulfate: water = 1:1.0:8, sulfuric acid to adjust the pH value to 3.5, exchange at 85°C for 1 hour, and wash. Hydrothermal roasting treatment, roasting temperature 580°C, 100% steam roasting time 2h. Treat the post-baked sample with a solution containing rare earth, and the treatment conditions are: a baked molecular sieve (dry basis): rare earth chloride (according to RE 2 o 3 Calculated): water = 1: 0.042: 8, exchanged at 70°C for 1 hour, and washed with deionized water. Hydrothermal roasting treatment, roasting temperature 580°C, 100% steam roasting time 2h. Treat the sample after secondary roasting with a solution containing phosphoric acid and oxalic acid, and the treatment conditions are: secondary roasting molecular sieve (dry basis): phosphoric acid (according to P): oxalic acid (containing two molecules of cr...

Embodiment 2

[0069]NaY zeolite is used as raw material for exchange with ammonium chloride solution, the treatment conditions are: NaY molecular sieve (dry basis): ammonium chloride: water = 1:0.8:8, hydrochloric acid to adjust the pH value to 4.0, exchange at 90°C for 1 hour, and wash. Hydrothermal roasting treatment, roasting temperature 550°C, 80% steam roasting time 2h. Treat the post-baked sample with phosphoric acid and fluorosilicic acid solution, the treatment conditions are: 1-baked molecular sieve (dry basis): phosphoric acid (according to P): fluorosilicic acid: water = 1: 0.01: 0.03: 8, hydrochloric acid to adjust pH2. 8. Exchange at 70°C for 1 hour, filter; wash with deionized water. Hydrothermal roasting treatment, roasting temperature 550°C, 70% steam roasting time 2h. Treat the sample after second roasting with a solution containing rare earth, and the treatment conditions are: second roasting molecular sieve (dry basis): rare earth chloride (according to RE 2 o 3 Calcul...

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Abstract

The invention discloses a modified Y-type molecular sieve which is characterized in that a cell constant is 2.420-2.440nm. According to weight percentages, the molecular sieve comprises 0.05-6% of P, 0.03-10% of RE2O3, and less than 22% of alumina. A specific hydroxyl nest concentration is smaller than 0.35mmol / g. In a formula, M200 DEG C, M500 DEG C and M800 DEG C t respectively represent weight loss percentages of the sample measured at 200 DEG C, 500 DEG C and 800 DEG C. C is sample crystallinity degree. The molecular sieve provided by the invention has low lattice defect, and can be used in a catalytic cracking catalyst as an active component. With the molecular sieve, long-period stable activity can be maintained, coke yield can be effectively controlled, and heavy oil utilization rate can be improved.

Description

technical field [0001] The present invention relates to a modified Y-type molecular sieve and its preparation method, and further relates to a high-stability, low-coke Y-type molecular sieve modified with phosphorus and rare earth and its preparation method. Background technique [0002] With the decreasing of petroleum resources, it has become an indisputable fact that petroleum raw materials become heavy and inferior. As the main processing method to convert heavy oil into gasoline and diesel light fuel oil, catalytic cracking inevitably needs to process more and lower quality heavy oil feedstock. Therefore, the catalytic cracking technology of heavy oil feedstock has received more and more attention. [0003] The impact of the heavy and inferior quality of raw oil on catalytic cracking is the decrease of conversion rate and the increase of coke yield. Aiming at this, people have done a lot of research on molecular sieve modification, catalyst manufacturing and process d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
CPCB01J2229/16B01J29/08B01J2229/37B01J29/088C01B39/24C10G11/05B01J35/002B01J2229/32B01J29/084B01J29/85C01B39/026B01J37/28B01J2229/186B01J35/30
Inventor 罗一斌庄立李明罡欧阳颖舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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