Grantee Research Project Results

1998 Progress Report: Catalytic Reduction of Nitric Oxide

EPA Grant Number: R823529
Title: Catalytic Reduction of Nitric Oxide
Investigators: Chuang, Steven S.C.
Institution: University of Akron
EPA Project Officer: Hahn, Intaek
Project Period: October 1, 1995 through September 1, 1998
Project Period Covered by this Report: October 1, 1997 through September 1, 1998
Project Amount: $280,211
RFA: Exploratory Research - Engineering (1995) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , Safer Chemicals , Land and Waste Management

Objective:

The long sought goal in heterogeneous catalysis of nitric oxide reduction has been to develop an understanding of (1) what makes a catalyst site highly active and (ii) how catalyst preparations may be tailored to have concentration of these highly active sites with strong resistance to deactivation. To address these questions, we propose to determine the reactivity of various types of adsorbed CO and NO on Rh, Rh-Pt, Pd, Ce-promoted Rh, Cu-ZSM-5 and Co-ZSM- 5 catalysts under transient and steady-state conditions. Results of this study will allow identification of the most active forms of adsorbed CO and NO for the reaction and the sites to which these species adsorb. This mechanistic information is required for the design of catalyst preparation methods to populate the most active form of the sites on the catalyst surface. To further address the second question, we plan to employ silane to enclose metal particles to inhibit sintering. Silanation may provide several important benefits to the Co-ZSM-5 and Cu- ZSM-5 catalysts: inhibition of sintering of metal and improved hydrothermal stability of ZSM-5. Successful development of silanation approach could provide new ways to inhibit sintering of not only NO reduction catalysts but also numerous supported metal catalysts of industrial significance.

Progress Summary:

Mechanism of nitric oxide decomposition on Cu-ZSM-5 has been determined. NO was found to decompose on Cu+ site and oxidize Cu+ to Cu2+. Auto- reduction capability of Cu2+ allows its conversion to Cu+ to complete the catalytic cycle.

Future Activities:

(I) Preparation of Co-ZSM-5, and Cu-Pd/ZSM-5 catalysts,
(II) determination of the nature of active sites on these catalysts and their deactivation characteristics, (III) modification of ZSM-5 based and Al2O3-supported catalysts for improvement deactivation resistance.

Journal Articles on this Report : 2 Displayed | Download in RIS Format

Publications Views
Other project views:	All 5 publications	2 publications in selected types	All 2 journal articles

Publications
Type	Citation	Project	Document Sources
Journal Article	Chuang SSC, Tan C-D. Mechanistic studies of the NO-CO reaction on Rh/Al2O3 under net-oxidizing conditions. Journal of Catalysis 1998;173(1):95-104	R823529 (1998)	not available
Journal Article	Konduru MV, Chuang SSC. Investigation of adsorbate reactivity during NO decomposition over different levels of copper ion-exchanged ZSM-5 using in situ IR technique. Journal of Physical Chemistry B 1999;103(28):5802-5813.	R823529 (1998) R823529 (Final)	Abstract: Journal of Physical Chemistry B-Abstract Exit

Supplemental Keywords:

Nitric oxide, Reactivity, Reaction pathway, NO decomposition., Scientific Discipline, Air, Environmental Chemistry, Engineering, Chemistry, & Physics, Environmental Engineering, metal catalysts, nitrous oxide, catalytic oxidation, characterization of catalysts, catalyst formulations, catalysts, air pollution, silination studies, Nitric oxide, catalytic reduction

Progress and Final Reports:

Original Abstract

The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.