Testing Total Oxidation Catalysts for Gas Cleanup in Waste Incineration at Pilot Scale

Abstract

Seven different total oxidation catalysts (PRO*CLEAN*500; EF 258 H/D; Siemens A; ZERONOX; and Ru, Pd, and V2O5 on a TiO2 support) have been tested for abatement of principal organic hazardous compounds (POHCs) in the flue gas from a waste incinerator of the fluidized-bed type. These catalysts were placed in a slip flow downstream from the waste incinerator. The catalytic reactors used were both metallic and glass, made for monoliths and for particulates. The temperatures used in the catalytic reactors ranged from 240 to 510 °C, and the volumetric gas hourly space velocities (GHSVs) ranged from 1200 to 5700 [(mgas,normal conditions 3/h)/mcatalyst 3]. The catalysts operated under a realistic flue gas, which was sampled before and after the catalytic reactor at different times on stream. Condensates after the catalytic reactor were also analyzed for organics and for compounds sometimes lost from the catalyst. Gas sampling and analysis were carried out using standarized methods. Conversions (destructions) of most of the POHCs were 99.99%, but small GHSV values were required. Experimental conditions for an even more refined catalyst comparison are also provided.

Studies of the Flash Carbonization Process. 1. Propagation of the Flaming Pyrolysis Reaction and Performance of a Catalytic Afterburner

“…The GHSV 1 used in this study was 2300-3900 h -1 . Even after considering the variances in the actual value of GHSV, our flow condition was comparable to that of Corella and co-workers, who studied the oxidation of organic compounds by catalyst monoliths in an incineration plant 14 and a biomass gasification process. 15 In the following subsections, we describe the performance of the afterburner without and with secondary air delivery.…”

Formation of Dioxins in the Catalytic Combustion of Chlorobenzene and a Micropollutant-like Mixture on Pt/γ-Al2O3

“…For example, chromium oxychloride (CrO2Cl2) has a boiling point of only 117 °C (12) and when a 12 wt % Cr2O3/2 wt % CrO3 catalyst was tested for the destruction of a chlorine-containing mixture, formation of volatile chromium oxychlorides was indeed observed (13). For more recent experience, see the work of Corella and co-workers (14,15). It appears that supported noble metals, especially Pt, are much better suited for the catalytic combustion of halogen-containing (waste) gases than oxidic catalysts, certainly when halogen levels are substantial.…”

Scaling up the Process of Catalytic Decomposition of Chlorinated Hydrocarbons with the Formation of Carbon Nanostructures

“…Until now, the pilot-scale utilization of chlorine-containing compounds deals with their incineration or catalytic oxidation [32][33][34][35][36]. At the same time, their gas-phase conversion into nanostructured carbon is mainly utilized at the fundamental level.…”