【摘要】 用XPS测定了PMo_12-nV_n、PV₁₄中O_1S、P_2p3/2、Mo_3d5/2的结合能、结合差热及红外数据,研究了钼、钒Keggin型杂多酸的热稳定性,并与钨、钼杂多酸的热稳定性进行了比较。结果表明,与钨、钼杂多酸相比,钼、钒杂多酸之间O_1S结合能及其热稳定性有较大的变化。由此可推测,钼、钒杂多酸的热稳定性主要受金属—氧的轨道重叠程度、杂多阴离子的电荷及M-O-M键角等因素的影响。更多还原

【Abstract】 The binding energies of O_1s, P_（2p）3/2, Mo_（3d）5/2 and V_（2p）3/2 in PMo_12-n V_n and PV₁₄ were determined by XPS. Referring to the TG-DTA and IR data, the difference in thermostability between PMo₁₂ and PV₁₄ was researched into, and compared with that between PW₁₂ and PMo₁₂.The results show that there is more difference of O_1S binding energy and thermostability of heteropolyacids between PMo₁₂ and PV₁₄ than that between PW₁₂ and PMo₁₂. It is deduced that the difference in thermostability between PMo₁₂ and PV₁₄ was mainly decided by such factors as the overlap of metal and oxygen orbitals, the charges of heteropoly-anions and the bond angle of M-O-M.更多还原