fulltext.study @t Gmail

Spatial profiles in partial oxidation of methane and dimethyl ether in an autothermal reactor over rhodium catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
39735 45833 2014 6 PDF Available
Title
Spatial profiles in partial oxidation of methane and dimethyl ether in an autothermal reactor over rhodium catalysts
Abstract

•Spatial profiles in CPO of methane and dimethyl ether were compared.•Both showed an initial oxidation followed by reforming section.•Rhodium exists in reduced state (rhodium metal) even within oxidation zone.•Results support direct mechanism of syngas formation for both species.

Catalytic partial oxidation (CPO) reactors have complex concentration and temperature gradients which make it difficult to understand the mechanism of autothermal operation. Previous research in the Schmidt group on methane CPO using the capillary sampling technique has shown the existence of two zones – oxidation and reforming [1], [2], [3] and [4]. Nearly (>90%) all of the oxygen in the feed is converted within the first 2 mm of the catalyst bed. In this paper, temperature and concentration profiles during the CPO of methane and dimethyl ether CH3OCH3, an oxygenated hydrocarbon, are presented. Results with the two feeds are compared and the nature of the profiles was similar, with sharp gradients existing in the oxidation zone with slower chemistries in the reforming section. The rhodium catalyst in the oxidation zone during methane CPO was also analyzed using XPS and XRD and shown to be rhodium metal.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (109 K)Download as PowerPoint slide

Keywords
Catalytic partial oxidation; Rhodium; Autothermal; Syngas; Methane; Dimethyl ether
First Page Preview
Spatial profiles in partial oxidation of methane and dimethyl ether in an autothermal reactor over rhodium catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 483, 5 August 2014, Pages 97–102
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis