Abstract
The limitation of the cyclohexene hydration reaction is that it is a three-phase immiscible reaction. We have described a strategy to overcome this interfacial mass transfer limitation by grafting an organosilane surfactant ((octyl)-trimethoxysilane (OTS)) onto the HZSM-5 zeolite surface. The characterization of the OTS-HZSM-5 zeolite was performed by FTIR, CA, BET, TPD, pyridine-IR, XPS, TGA and XRD techniques. The functionalization of the HZSM-5 zeolite could increase hydrophobicity without significantly reducing the density of acid sites. As a result, the OTS-HZSM-5 zeolite had high catalytic activity (20.87% conversion) compared with HZSM-5 (4.15% conversion) at 130 °C after 4 h. The high catalytic activity makes it a promising candidate for other acid-catalyzed two-phase reactions.
Highlights
Cyclohexanol is an important intermediate material for the production of adipic acid and caprolactam
We rst con rmed the successful gra ing of OTS onto the HZSM-5 zeolite and characterized the changes in the surface properties. These analyses were performed via Fouriertransform infrared spectroscopy (FTIR), contact angle (CA), N2-adsorption/desorption (BET), temperature-programmed desorption (TPD), pyridine-IR, X-ray photoelectron spectroscopy (XPS), thermal gravimetric analysis (TGA) and X-ray diffraction (XRD) techniques
We evaluated the effects of OTS gra ing onto the HZSM-5 zeolite in the cyclohexene hydration reaction under various conditions
Summary
Cyclohexanol is an important intermediate material for the production of adipic acid and caprolactam. Adipic acid is used as an important raw material for polymerization to produce nylon 66 and synthetic polyurethane, and caprolactam is used in the production of engineering plastics.[1,2,3,4,5,6] Cyclohexanol is o en used as a solvent for paints and varnishes in coatings, and as a matting agent in textiles.[7,8] cyclohexanol is an important chemical raw material. Nur et al.[15] carried out the silylation of HZSM-5 and NaY with sulfanilic acid to prepare 1,2-epoxyoctane. They found that the active sites were mainly located on the inner surface of the zeolite. They implemented the concept of the amphiphilic catalyst by partially covering it to improve conversion. The hydrophilicity/hydrophobicity of the zeolite received increased attention due to its signi cant in uence on the physical and chemical properties and application of zeolites.[18,19,20,21,22,23]
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