Benzene, Toluene, m-Xylene Adsorption on Silica-Based Adsorbents

T. Ncube, K. Suresh Kumar Reddy, Ahmed Al Shoaibi, C. Srinivasakannan

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

It was proposed that incorporation of nitrogen groups on mesoporous silica pores would enhance its surface polarity and improve adsorption of gaseous BTX (benzene, toluene, and m-xylene). Among the popular list of mesoporous silica adsorbents, KIT-6 and SBA-15 were selected as a result of their superior textural properties, as well as because they are being widely reported in literature. After preliminary screening using toluene test, KIT-6 was chosen to have better affinity and therefore selected for Aptes (3-aminopropyl triethoxysilane) surface modification. Aptes modification was performed through the grafting method utilizing factorial design of experimental techniques to identify the effective process variable covering the parameters: Aptes concentration, reaction temperature, and reaction duration. The results of a statistical design of experiments using Minitab-15 showed that Aptes concentration was the only significant factor which affects the silica adsorbent BET surface area. Benzene adsorption was found to be highest on KIT-6 adsorbent, while m-xylene and toluene had their highest values on 0.006% Aptes adsorbent (KIT-6 modified with 0.006% v/v Aptes) relative to other adsorbents. m-Xylene had the highest adsorption relative to toluene and benzene on all modified silica adsorbents (0.006% Aptes, 0.33% Aptes, and 0.66% Aptes) except for 8% Aptes adsorbent. 0.006% Aptes adsorbent was selected as the best adsorbent for BTX adsorption.

Original languageBritish English
Pages (from-to)1882-1888
Number of pages7
JournalEnergy and Fuels
Volume31
Issue number2
DOIs
StatePublished - 16 Feb 2017

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