Double-component modified molecular sieve with improved hydrothermal stability and production method thereof

US9895686B2 · kind B2 · utility

Assignee

• PetroChina Company Limited · CN

Inventors

• Xionghou Gao · Beijing, CN
• Dong Ji · Beijing, CN
• Haitao Zhang · Ithaca, US
• Hongchang Duan · Beijing, CN
• Di Li · Lanzhou, CN
• Zhengguo Tan · Beijing, CN
• Yi Su · Blankenloch, DE
• Zhicheng Tang · Plano, US
• Yi Wang · Lanzhou, CN
• Yanqing Ma · Lanzhou, CN
• Yanbo Sun · Lanzhou, CN

Key dates

• Filing date: Dec 1, 2009
• Grant date: Feb 20, 2018
• Expiry date: Feb 10, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G2400/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method for producing double-component modified molecular sieve comprises adding molecular sieve to an aqueous solution containing phosphorus to form a mixture, allowing the mixture to react at pH of 1-10, temperature of 70-200° C. and pressure of 0.2-1.2 MPa for 10-200 min, and then filtering, drying and baking the resultant to obtain phosphorus-modified molecular sieve, and then adding the phosphorus-modified molecular sieve to an aqueous solution containing silver ions, allowing the phosphorus-modified molecular sieve to react with silver ions at 0-100° C. in dark condition for 30-150 min, and then filtering, drying and baking. The obtained double-component modified molecular sieve contains 88-99 wt % molecular sieve with a ratio of silica to alumina between 15 and 60, 0.5-10 wt % phosphorus (based on oxides) and 0.01-2 wt % silver (based on oxides), all based on dry matter. A catalyst produced from the double-component modified molecular sieve has improved hydrothermal stability and microactivity.