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题名: THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM
作者: Zhou Lixing1;  Chen Shuxia1;  Zheng Lubin1
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 1985
DOI: 10.3866/PKU.WHXB19850610
卷: 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
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139427
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Beijing 100864, Peoples R China

Recommended Citation:
Zhou Lixing,Chen Shuxia,Zheng Lubin. THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM[J]. ACTA PHYSICO-CHIMICA SINICA,1985,1(6):566-570.
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