A new method of estimating standard enthalpies of formation of zeolites

作者：Shi Jian gong; Lu Guan zhong^*; Cao Gang

来源：Journal of Porous Materials, 2008, 15(5): 513-517.

DOI：10.1007/s10934-007-9105-7

• formation enthalpy
• thermodynamic stability
• zeolite
• calculation

A new method to calculate the standard enthalpies (Delta H(f,zeo)(0)) of formation of zeolites is founded based on the assumption that the standard enthalpy of formation of zeolite is equal to the sum of the standard enthalpies of all oxide components and the reaction standard enthalpy change between the exchangeable ion oxide and alumina. The results show that the deviation of Delta H(f,zeo)(0) of zeolite calculated by this method is less than 0.7% compared with the experimental value of Delta H(f,zeo)(0). The standard enthalpy of formation of hypothetical [SiO(2)] unit in zeolite is suggested to estimate the thermodynamic stability of zeolite. It is found that the presence of crystal water in zeolite is in favor of increasing the thermodynamic stability of zeolite.

• 出版日期2008-10
• 单位东华大学