The treatment of lead-containing cathode-ray tube (CRT) glass is an important environmental issue. One approach is the removal of lead by chloride volatilization. In the present work, the reaction of CRT glass with PVC as the chlorinating agent and Ca(OH)2 as the chlorine absorber was investigated by thermogravimetric analysis (TGA) in air. Seven reaction steps occurring at different temperatur...

Tandem mass spectrometry is used to show that low energy collisions of ionized halocarbenes, including CBr2 and CBrCl•+, with molecular oxygen lead to (i) decarbonation with formation of the dihalogen molecular cation and (ii) oxygenolysis yielding BrCO+. Both reactions may occur via the same ion-molecule addition product of molecular oxygen and the ionized carbene. Reaction is favored at low c...

Incremental vacuum dehydration-decarbonation experiments were performed at 190°C on chemically “cleaned” aliquots of a gibbsite-dominated, Eocene-age bauxite sample with evolution of CO2 and H2O. “Plateau” F (CO2/H2O ratios) and C values of the CO2 derived from gibbsite were attained over the dehydration interval, Xv(H2) 0.16 to 0.67 (i.e., 16 to 67% breakdown of gibbsite). The plateau value of...

[1] Abstract: Gas data were collected from geothermal production fields, fumaroles, and hot springs in Central America in order to investigate the relation between volatile output and spatial distribution of volcanic systems. The He/He ratios are 6.5 ± 0.7 Ra throughout the region, indicating that helium is predominantly of mantle origin and is largely independent of variations in the character...

We study in this paper the conversion of CaO-based CO2 sorbents when subjected to repeated carbonation-calcination cycles with a focus on thermally pretreated/doped sorbents. Analytical equations are derived to describe the evolution of conversion with the cycle number from a unifying model based on the balance between surface area loss due to sintering in the looping-calcination stage and surf...

Abstract More than one teramole of carbon per year is subducted as carbonate or carbonaceous material. However, the influence carbonation/decarbonation reactions on seismic activity within subduction zones poorly understood. Here we present field and microstructural observations, including stable isotope analyses, veins Higuchi serpentinite body, Japan. We find that oxygen compositions indicate...