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THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM
Zhou Lixing; Chen Shuxia; Zheng Lubin
刊名ACTA PHYSICO-CHIMICA SINICA
1985
DOI10.3866/PKU.WHXB19850610
1期:6页:566-570
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Chemistry, Physical
研究领域[WOS]Chemistry
英文摘要By the use of a precision automatic adiabatic calorimeter we have measured the heat capacities for water/silica adsorption system with various adsorbed amoun ts over the temperature range from 200-320K. The results obtained show that when the amount of adsorbed water makes the surface coverage (theta)larger than, the peak for phase transition of adsorbed water will appear on the C-p-T curves. This means that aggregate of water molecules adsorbed on the surface of silica has for med. On the other hand when theta<1, no phase transition is observed as the tempe rature of the system rise and then the C-p-T curves are smooth. These phemoraena are in coincidence with those in the H2O/gamma-Al2O3 adsorption system. Since the ad sorption force for water molecules on silica surface is weaker than that on the gamma-Al2O5, the peak profiles for water/silica is sharper than that for H2O/gamma-Al2O3 even if the two adsorption systems have the same amount of adsorbed water. The rise in the peak temperature with increase of amount of adsorbed water in the wa ter/silica adsorption system is faster than that in the H2O/gamma-Al2O3. The fact men tioned above shows that the two dimension water adsorbed on the surface of sili ca could become bulk water easier as compared with the water adsorbed on the gamma- Al2O3. Besides, the heat capacities for silica without any adsorbed water over the temperature range from 200K to 300 K have been obtained by extrapolating the C-p-T curves with various adsorbed amounts at the same temperatures,
语种英语
WOS记录号WOS:000207568200010
引用统计
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/139427
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, Beijing 100864, Peoples R China
推荐引用方式
GB/T 7714
Zhou Lixing,Chen Shuxia,Zheng Lubin. THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM[J]. ACTA PHYSICO-CHIMICA SINICA,1985,1(6):566-570.
APA Zhou Lixing,Chen Shuxia,&Zheng Lubin.(1985).THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM.ACTA PHYSICO-CHIMICA SINICA,1(6),566-570.
MLA Zhou Lixing,et al."THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM".ACTA PHYSICO-CHIMICA SINICA 1.6(1985):566-570.
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