Dynamic Change of Copper in Fly Ash during de Novo Synthesis of Dioxins

Citations Over TimeTop 10% of 2005 papers

Abstract

Although many researchers have reported that copper chloride is an important catalyst that generates relatively large amounts of dioxins in heat experiments involving model fly ash, details on the behavior of copper during the process are still unavailable. In this study, we used in situ XANES experiments involving one type of real fly ash, which originated from a municipal solid-waste incinerator (MSWI), and two fly ash models to investigate the behavior of copper in fly ash at temperatures that are suitable for de novo synthesis, which is the major formation route for dioxins during waste incineration and thermal processes. Cupric compounds in real fly ash and model fly ash A(CuCl2.2H2O + activated carbon (AC) + boron nitride (BN)) were reduced to cuprous compounds or elemental copper at low temperatures. The changes in the Cu XANES spectra of real fly ash were similar to those of model fly ash A and those of an oxychlorination catalyst. In model fly ash B (CuO + AC + KCl + BN), CuO did not vary dramatically in the temperature range studied. In this study, we found strong evidence that oxychlorination, the key mechanistic step in the formation of dioxins, occurred in both real MSWI and model fly ash.

Related Papers

• → Utilization of bottom ash from the incineration of separated wastes as a cement substitute(2005)22 cited
• An Overview on Treatment of Municipal Solid Waste Incineration Fly Ash(2003)
• Compositions of Bottom Ash of Municipal Solid Waste Incineration and Their Disposition at Home and Abroad(2013)
• A Study about Recycling from Municipal Solid Waste Incineration Bottom Ash(2008)
• → A glance at the world(2017)