Abstract
Disordered carbon particulates were deposited on the surface of natural acid treated zeolite through graphite evaporation by electron beam to improve adsorption properties of the porous material. This study focuses on the development of the new material and not on applications. The effect of acid treatment and carbon deposition on the physical properties of the natural material was investigated. The zeolites were characterized via spectroscopic and microscopic methods, thermal analysis, and gas sorption analysis. Analysis revealed that the surface area and volume increased by a factor of ten after the carbon-coating was deposited onto the zeolite surface and indicated that the Si/Al ratio was higher with the acid treated sample. The acid treatment promoted dealumination of the zeolite and increased overall surface area, whereas the carbon coating re-aluminated the zeolite while adding silica back to the main molecular framework, thus increasing crystallinity and thermal stability and further improving the high surface area produced by the acid treatment.
Highlights
Zeolites are hydrated aluminosilicate minerals which possess structurally interlinked tetrahedra of alumina ( AlO54− ) and silica ( SiO44− ) that make up its primary cage structure [1] [2]
Analysis revealed that the surface area and volume increased by a factor of ten after the carbon-coating was deposited onto the zeolite surface and indicated that the Si/Al ratio was higher with the acid treated sample
The acid treatment promoted dealumination of the zeolite and increased overall surface area, whereas the carbon coating re-aluminated the zeolite while adding silica back to the main molecular framework, increasing crystallinity and thermal stability and further improving the high surface area produced by the acid treatment
Summary
Zeolites are hydrated aluminosilicate minerals which possess structurally interlinked tetrahedra of alumina ( AlO54− ) and silica ( SiO44− ) that make up its primary cage structure [1] [2]. Cage-like framework which enables them to trap other molecules inside it as part of a physical process known as adsorption [4]. Zeolites are often referred to as molecular sieves due to the various sizes of pores in them, which is why they are generally considered effective adsorbents [5] These properties make zeolites an ideal candidate for multiple applications. Namely microporous 3D graphene-like carbon, has been employed using a zeolite template where ethylene and acetylene are the main sources of carbon rather than pure graphite [8] In this specific case, the 3D graphene network can be formed inside the zeolite framework whereas in our study we deposit carbon on the surface of the zeolite samples. The same group successfully extracted pyrolytic carbon by exposing the zeolite to propylene at very high temperatures
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
