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Modified Y-type zeolite and preparation process and use thereof
US9782757B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9782757-B2 |
| Application number | US-201214354464-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 26, 2012 |
| Priority date | Oct 26, 2011 |
| Publication date | Oct 10, 2017 |
| Grant date | Oct 10, 2017 |
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Abstract
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A modified Y-type molecular sieve has a unit cell size of 2.420-2.440 nm. It contains a phosphorus content of 0.05-6%, a RE 2 O 3 content of 0.03-10%, and an alumina content of less than 22%, and a specific hydroxyl nest concentration of less than 0.35 mmol/g and more than 0.05 mmol/g. The modified Y-type molecular sieve is used as the active component in a catalytic cracking catalyst. The catalytic cracking catalyst maintains a stable activity for a long time, effectively controls the coke yield and increases the heavy oil utilization.
First claim
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The invention claimed is: 1. A modified Y-type zeolite, comprising, by weight percentage of a total weight of the modified Y-type zeolite, a phosphorus content of 0.05-6%, a RE 2 O 3 content of 0.03-10%, and an alumina content of less than 22%, and having a specific hydroxyl nest concentration of less than 0.35 mmol/g and more than 0.05 mmol/g, said specific hydroxyl nest concentration = [ ( M 500 ° C . - M 200 ° C . ) - ( 17 / 9 ) × ( M 800 ° C . - M 500 ° C . ) ] × 1000 36 × ( 1 - M 200 ° C . ) × C ( unit : mmol / g ) wherein M 200° C. , M 500° C. and M 800° C. are respectively percentages of weight loss of the modified Y-type zeolite measured at 200° C., 500° C., and 800° C., and C is a crystallinity of the modified Y-type zeolite. 2. The modified Y-type zeolite according to claim 1 , wherein the phosphorus content is 0.1-4.5%, the RE 2 O 3 content is 0.1-4.5%, the alumina content is less than 21%, and wherein the modified Y-type zeolite has a unit cell size of 2.428-2.438 nm, and a crystallinity retention rate of 85%-87%, wherein the crystallinity retention rate is measured upon aging the modified Y-type zeolite in 100% steam at 800° C. for two hours. 3. The modified Y-type zeolite of claim 1 , having a crystallinity of 53% to 57%. 4. The modified Y-type zeolite of claim 1 , having a crystallinity retention rate of 85%-87%, wherein the crystallinity retention rate is measured upon aging the modified Y-type zeolite in 100% steam at 800° C. for two hours. 5. A process for preparing a modified Y-type zeolite, wherein the modified Y-zeolite comprises, by weight percentage of a total weight of the modified Y-type zeolite, a phosphorus content of 0.05-6%, a RE 2 O 3 content of 0.03-10%, and an alumina content of less than 22%, the modified Y-type zeolite has a unit cell size of 2.420-2.440 nm and a crystallinity of 53%-57%, and has a specific hydroxyl nest concentration of between 0.05 mmol/g and 0.35 mmol/g, the process comprising: treating a NaY zeolite sequentially in a first exchange step, a first hydrothermal treatment step, a second exchange step, a second hydrothermal treatment step, a third exchange step, and a third hydrothermal treatment step, wherein the first exchange step comprises mixing the NaY zeolite with a first exchange solution to form a first mixture, wherein the second exchange step comprises mixing a zeolite from the first hydrothermal treatment step with a second exchange solution to form
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Classifications
characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title
X-ray diffraction · CPC title
characterised by their physical properties · CPC title
After-treatment · CPC title
not in framework positions · CPC title
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- What does patent US9782757B2 cover?
- A modified Y-type molecular sieve has a unit cell size of 2.420-2.440 nm. It contains a phosphorus content of 0.05-6%, a RE 2 O 3 content of 0.03-10%, and an alumina content of less than 22%, and a specific hydroxyl nest concentration of less than 0.35 mmol/g and more than 0.05 mmol/g. The modified Y-type molecular sieve is used as the active component in a catalytic cracking catalyst. The cat…
- Who is the assignee on this patent?
- China Petroleum & Chem Corp, Res Inst Petroleum Processing Sinopec
- What technology area does this patent fall under?
- Primary CPC classification B01J29/088. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Oct 10 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).