English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Deconvoluting Transient Water Effects on the Activity of Pd Methane Combustion Catalysts

Huang, W., Goodman, E. D., Losch, P., & Cargnello, M. (2018). Deconvoluting Transient Water Effects on the Activity of Pd Methane Combustion Catalysts. Industrial and Engineering Chemistry Research, 57(31), 10261-10268. doi:10.1021/acs.iecr.8b01915.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Huang, Weixin1, Author
Goodman, Emmett D.1, Author
Losch, Pit1, 2, Author              
Cargnello, Matteo1, Author
Affiliations:
1Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, California 94304, United States, ou_persistent22              
2Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445618              

Content

show
hide
Free keywords: -
 Abstract: It is well-known that water has a detrimental effect on the low-temperature methane combustion activity of palladium catalysts. However, when the transient activity (i.e., light-off or ignition–extinction experiments) of methane combustion catalysts is compared, the effects of water adsorption–desorption phenomena are seldom directly considered. While these effects are important to keep in mind when studying support-dependent methane combustion activity, they are crucial when selecting a catalyst diluent. In many cases, the water adsorption–desorption properties of “inert” reactor diluents may dominate the transient methane combustion activity of a Pd catalyst. In this contribution, we show how different catalyst pretreatments on various Pd catalysts can influence the presence of water and hydroxyl groups on the surface of catalyst supports, reactor diluents, and active phase, and how this process dramatically affects observed methane combustion activity. Transiently, alumina (both support and diluent), which strongly binds water that is produced in the reaction, can keep the PdO phase active and water-free. However, after alumina surfaces become saturated with water, the PdO surface also becomes hydroxylated, which decreases the catalyst’s methane combustion activity. Due to this time-dependent surface titration, care must be taken when comparing transient experiments between catalysts on different supports; comparable data for methane combustion must be collected while carefully checking for water adsorption on the surface of the catalyst and diluent. Finally, we propose that a channel for sustainable high combustion rates is possible if water is prevented from adsorbing on the highly active PdO surfaces.

Details

show
hide
Language(s): eng - English
 Dates: 2018-05-022018-07-062018-07-062018-08-08
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.iecr.8b01915
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Industrial and Engineering Chemistry Research
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Washington, D.C : American Chemical Society
Pages: - Volume / Issue: 57 (31) Sequence Number: - Start / End Page: 10261 - 10268 Identifier: ISSN: 0888-5885
CoNE: https://pure.mpg.de/cone/journals/resource/954928546246