US 12,318,768 B2
Method for molecular sieve shaping by using rice husk as template
Guowu Zhan, Fujian (CN); Meiting Guo, Fujian (CN); Shufeng Zhou, Fujian (CN); Dongren Cai, Fujian (CN); Qingqing Xu, Fujian (CN); and Jianbin Lin, Fujian (CN)
Assigned to Huaqiao University, Quanzhou (CN)
Filed by Huaqiao University, Fujian (CN)
Filed on Jan. 3, 2025, as Appl. No. 19/008,931.
Application 19/008,931 is a continuation of application No. PCT/CN2023/129579, filed on Nov. 3, 2023.
Claims priority of application No. 202211383481.X (CN), filed on Nov. 3, 2022.
Prior Publication US 2025/0135447 A1, May 1, 2025
Int. Cl. B01J 37/10 (2006.01); B01J 29/40 (2006.01); B01J 35/37 (2024.01); B01J 35/61 (2024.01); B01J 35/63 (2024.01); B01J 37/00 (2006.01); B01J 37/06 (2006.01); C01B 39/02 (2006.01); C01B 39/26 (2006.01)
CPC B01J 37/0009 (2013.01) [B01J 29/40 (2013.01); B01J 35/37 (2024.01); B01J 35/615 (2024.01); B01J 35/617 (2024.01); B01J 35/633 (2024.01); B01J 35/635 (2024.01); B01J 37/009 (2013.01); B01J 37/06 (2013.01); B01J 37/10 (2013.01); C01B 39/026 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01); C01P 2006/21 (2013.01)] 3 Claims
 
1. A method for preparing a molecular sieve comprising the following steps:
(1) mixing ZSM-5 molecular sieve powder incorporated with rice husks, a binder, and an extrusion aid with weight percentages of 72-75%: 7-25%: 2-20% to be homogeneous, then adding a peptizer, and mixing to be homogeneous, an amount of the peptizer is 1-3 wt % of a total weight of a mixture of the ZSM-5 molecular sieve powder incorporated with the rice husks, the binder, and the extrusion aid, wherein a method for preparing the ZSM-5 molecular sieve powder incorporated with the rice husks comprises: mixing water, a tetrapropylammonium hydroxide solution with a concentration of 40 wt %, sodium metaaluminate, tetraethyl orthosilicate, and the rice husks to be homogeneous in sequence with a weight ratio of 79:46:1:77:15; subjecting to a hydrothermal reaction at 170° C. for 24 hours to yield an obtained sample; and washing the obtained sample with deionized water and ethanol, subjecting to centrifugation, drying at a constant temperature of 80° C., and then calcining in a muffle furnace at 550° C. for 6 hours at a heating rate of 5° C. per minute;
(2) introducing water to the material obtained in the step (1), mixing to be homogenous, and performing a kneading process to form a sticky conglomerate;
(3) extruding the sticky conglomerate obtained in the step (2) with an extrusion device to obtain moist strips; and
(4) drying, calcining, and shaping the moist strips obtained in the step (3).