Analysis of Silica Surface Heterogeneity Using Butane and Butene Adsorption Data

✍ Scribed by Teresa J. Bandosz

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 140 KB
• Volume: 193
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5042

✦ Synopsis

difficulty in solving this equation numerically is related to Adsorption isotherms for butane and butene measured on silica its ill-posed character which makes the solution very sensisamples at different temperatures are used as a data base for tive to the experimental error. Meaningful results may be describing the chemical and physical changes in the systems. The obtained only if the solution is stabilized by so-called stable numerical method for solving the adsorption integral equasmoothing/regularization (9). In this work we use a recently tion (SAIEUS) is used to deconvolute adsorption data. The effect developed stable numerical method (SAIEUS) in which the of lateral interactions between adsorbed molecules on the results choice of the optimal degree of smoothing is based on analyobtained is underlined. The adsorption properties of the initial sis of the variance of the solution and the effective bias and heat-treated silica samples are discussed in terms of their introduced by the smoothing (10).

butane and butene adsorption energy distributions. The analysis of the results obtained reveals the complex nature of the silica

The objective of this paper is to describe the changes in surface due to its microporosity and the presence of surface hythe surface of microporous silica upon heat treatment dedroxyl groups. ᭧ 1997 Academic Press tected using sorption of butane and butene. The probe mole-Key Words: silica; surface heterogeneity; energy distribution; cules chosen have similar molecular structure; however, the heat of adsorption.

p-bond present in butene molecules causes them to interact with hydroxyl groups of silica in a specific way (11). Using both molecules we expect to observe either chemical or