tailieunhanh - Production of ketones from sewage sludge over zirconia-supporting iron oxide catalysts in a steam atmosphere

Recovering useful hydrocarbons from sewage sludge using zirconia-supporting iron oxide catalysts was investigated. Zirconia has activity for decomposing water molecules to generate active oxygen and hydrogen species. | ELSEVIER Available online at ScienceDirect Applied Catalysis B Environmental 68 2006 154-159 APPLIED CATALYSIS B ENVIRONMENTAL locate apcatb Production of ketones from sewage sludge over zirconia-supporting iron oxide catalysts in a steam atmosphere Eri Fumoto Yosuke Mizutani Teruoki Tago Takao Masuda Division of Chemical Process Engineering Graduate School of Engineering Hokkaido University N13 W8 Kita-Ku Sapporo 060-8628 Japan Received 27 January 2006 received in revised form 14 July 2006 accepted 22 August 2006 Available online 15 September 2006 Abstract Recovering useful hydrocarbons from sewage sludge using zirconia-supporting iron oxide catalysts was investigated. Zirconia has activity for decomposing water molecules to generate active oxygen and hydrogen species. These oxygen species spill over to the surface of iron oxide and react with hydrocarbons to produce oxygen-containing organic chemicals such as acetone. Thus zirconia-supporting iron oxide catalyst has two kinds of active sites on zirconia and on iron oxide. Sewage sludge was hydrothermally liquefied at 573 K in advance yielding black water containing various hydrocarbons to enhance the contact of reactant molecules with the catalysts. It was found that the hydrocarbons in the black water converted well to a mixture containing primarily acetone without any carbonaceous residue over zirconia-supporting iron oxide catalysts under the conditions of one atmospheric pressure and superheating steam atmosphere. Furthermore it was confirmed that acetone was produced continuously from the sewage-derived black water over the catalysts using a bench scale flow reactor. 2006 Elsevier . All rights reserved. Keywords Biomass waste Sewage sludge Iron oxide catalyst Partial oxidative reaction Acetone 1. Introduction Large amounts of sewage sludge are produced continuously in sewage disposal plants. The most common methods for treating the sewage sludge are disposal in a .