反应物粒度对化学反应平衡常数的影响

在纳米颗粒化学反应热力学理论模型的基础上,以纳米氧化铜与硫酸氢钠溶液的反应体系为例,研究了纳米氧化铜颗粒的粒度对其化学反应平衡常数的影响规律。研究结果表明:在纳米氧化铜作为反应物的高分散多相反应体系中,平衡常数不仅是温度的函数,而且还与反应物(或产物)分散相的粒度有关;以纳米氧化铜颗粒为反应物,其粒度对化学反应平衡常数有很大影响,即随着反应物颗粒的粒度减小,化学反应的平衡常数增大;实验结果与理论分析的规律一致。

Effect of the Particle Sizes of a Reactant on Its Reaction Equilibrium Constants

Based on the thermodynamic theory of chemical reaction involving nanoparticles, effect of particle sizes on chemical equilibrium constants was studied by using the reaction of nanocrystal CuO and NaHSO_4 solution. The results show that equilibrium constants are not only the function of temperature, but also related to the particle sizes of reactants or/and products in heterogeneous systems of the reaction involving nano-CuO.There is an obvious effect of the sizes of nano-CuO on the equilibrium constants of chemical reaction, the equilibrium constants increase with the sizes of reactant decreasing; and the results of experiment are coincident with theoretical analysis.