(154f) Carbonization activation behavior of rice husks and a new method for synthesizing hierarchical zeolite Y

Rice husk is an inexpensive agricultural sideline product with huge annual output. The main components are cellulose, lignin and silicon dioxide. The burning of rice husk each year brings serious environmental problems. Therefore, it is meaningful to develop a high-value utilization method of rice husks. The purpose of this paper is to study the pyrolysis and activation of rice husks, the formation process of rice husk carbon mesopores, to explore the reasons for the formation of mesopores in rice husk carbon, and to study the process of silica to form zeolite in rice husk.
In this project, a method for preparing mesoporous rice husk carbon is developed, and Na2SiO3 in activated rice husk carbon is converted into hierarchical zeolite through a simple synthesis process. The study found that there are differences in the pyrolysis temperature of each component in the rice husk under air atmosphere. By adjusting the pyrolysis temperature, cellulose and hemicellulose in the rice husk can be selectively removed. By using NaOH to activate the pyrolyzed rice husk, mesoporous carbon was obtained. Pyrolysis temperature can regulate the degree of component volatilization, which can effectively adjust the pore diameter of rice husk carbon. The addition amount of activator NaOH is a very critical factor. An additional aluminum source and H2O were added to the activated rice husk carbon, and a simple hydrothermal crystallization method using mesopores in the rice husk char as a hard template was successfully used to obtain hierarchical zeolite Y.