Chemistry

1601 Submissions

[2] viXra:1601.0275 [pdf] submitted on 2016-01-25 15:16:39

A Comparison Study on Original and Torrefied Hazelnut Shells using a Bubbling Fluidised Bed Gasifier

Authors: René Laryea-Goldsmith, Alper Sarioğlan, Parvana Aksoy, Işıl Işık Gülsaç, Berrin Engin, Yeliz Durak Çetin, Hakan Karataş
Comments: 12 Pages.

Torrefaction is mild thermo-chemical process similar to pyrolysis, that can be applied to biomass to improve energy density and hydrophobicity. Comparison was made between original and torrefied forms of hazelnut shell agricultural waste biomass, when these materials were subjected to gasification using a “bench-scale” fluidised bed gasifier. Results indicated that a simplified torrefaction process was successful in physical transformation of the hazelnut shell and that the resultant syn-gas was of a relatively higher calorific value, together with lower tar content. Keywords: biomass, TGA, thermogravimetry, thermogravimetic analysis, gasification, fluidisation
Category: Chemistry

[1] viXra:1601.0273 [pdf] replaced on 2016-01-26 06:30:54

The Coulombic Nature of the van der Waals Bond Connecting Conducting Graphene Layers in Graphite

Authors: Raji Heyrovska
Comments: Pages. Published in: Graphene, 5, 35-38, 2016, http://dx.doi.org/10.4236/graphene.2016.52004

Carbon forms a variety of compounds with single, double, triple and the intermediate resonance bonds with atoms of its own or other kinds. This paper is concerned with graphite, a very useful material, which is a stack of electrically conducting graphene layers held together by weak van der Waals (vdW) bonds. It crystallizes in hexagonal and rhombohedral forms, in which the hexagon inter-planar bond distance is 0.34 nm. Here a new and simple approach accounts for this bond length and shows the coulombic nature of the vdW bond.
Category: Chemistry