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THERMOCHEMICAL STUDY FOR WATER/SILICA ADSORPTION SYSTEM
Zhou Lixing; Chen Shuxia; Zheng Lubin
Source PublicationACTA PHYSICO-CHIMICA SINICA
1985
DOI10.3866/PKU.WHXB19850610
Volume1Issue:6Pages:566-570
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
AbstractBy 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,
Language英语
WOS IDWOS:000207568200010
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/139427
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, Beijing 100864, Peoples R China
Recommended Citation
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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