Petrochina Company Limited

ZhengGuo Tan

Haitao Zhang

Di Li

Xionghou Gao

Hongchang Duan

Dong Ji

Yi Wang

Yanqing Ma

Yanbo Sun

Yi Su

Chenxi Zhang

Zhicheng Tang

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&#xb0; 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&#xb0; 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.

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

Modified molecular sieve characterized by improved sodium-resisting contamination activity and preparation method thereof are provided. The method comprises: adding molecular sieve in phosphorus-containing organic solution, and reacting for 10-200 minutes at temperature of 70-200&#xb0; C. and pressure of 0.2-1.2 MPa, and then filtering, drying and calcining. The said modified molecular sieve contains 90-99 wt. % molecular sieve as dry basis and 1-10 wt. % phosphorus as oxide. The said method can improve the capability of sodium-resisting contamination effectively, and its technology is simple and fits the existing catalyst production apparatus and process. The said modified molecular sieve has high sodium-resisting contamination activity, and the model catalyst by sodium contamination has high activity retention.

Modified molecular sieve characterized by improved sodium-contamination-resisting activity and preparation method thereof

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Lanzhou, China

ZhengGuo Tan