Measurement of Oxygen Storage Capacity of Three-Way Catalyst and Optimization of A/F Perturbation Control to Its Characteristics

2002 ◽  
Author(s):  
Kouji Miyamoto ◽  
Hiroyuki Takebayashi ◽  
Takahisa Ishihara ◽  
Hiroyuki Kido ◽  
Koichi Hatamura
Keyword(s):  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Three Way Catalyst

Overview: Modification of Cerium Oxide in Three-Way Catalysts

2014 ◽  
Vol 575 ◽  
pp. 97-102 ◽  
Author(s):  
M. Nazri Abu Shah ◽  
S. Hanim Md Nor ◽  
Kamariah Noor Ismail ◽  
Abdul Hadi
Keyword(s):  
Thermal Stability ◽  
Rare Earth ◽  
Metal Oxides ◽  
Cerium Oxide ◽  
Storage Capacity ◽  
Rare Earth Metals ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Alkaline Metals ◽  
Three Way Catalyst

An overview of modification of cerium oxide, CeO2which is employed in the three-way catalyst (TWCs) is presented in this article. The modifications of cerium oxide, CeO2incorporated with the metal oxides for the improvement of thermal stability, microstructure and oxygen storage capacity (OSC) are discussed. In view of that, the types of metal oxide are grouped into transition metals, rare earth metals, and alkaline metals and the effect of each group into cerium oxide, CeO2are elaborated.

Automotive Three-Way Catalyst Diagnostics with Experimental Results

2011 ◽  
Vol 133 (5) ◽  
Author(s):  
Brandon M. Dawson ◽  
Matthew A. Franchek ◽  
Karolos Grigoriadis ◽  
Robert W. McCabe ◽  
Mike Uhrich ◽  
...  
Keyword(s):  
Instrumental Variables ◽  
Storage Capacity ◽  
Test Procedure ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Model Structure ◽  
Information Synthesis ◽  
Catalyst Temperature ◽  
Useful Life ◽  
Three Way Catalyst

Presented is the model based diagnostics of a three-way catalyst (TWC). The proposed TWC model relates measurable engine inputs (engine air mass (AM) and catalyst temperature) to a metric that quantifies TWC oxygen storage capacity. The TWC model structure is based on the dynamics of the TWC and identified using orthogonal least squares (OLS). The model coefficients are estimated using an instrumental variables four step (IV4) approach. TWC diagnostics is realized by means of an information synthesis (IS) technique where changes in the adapted TWC model coefficients are utilized to estimate TWC health. The approach is experimentally validated on a federal test procedure (FTP) drive cycle for healthy (full useful life, FUL) and failed (threshold) TWCs. The results will show that a 100% accurate classification in TWC health estimation (FUL or threshold) is produced for the catalysts tested.

A Systematic Method for Automotive Three-Way Catalyst Diagnostics: Experimental Results

2008 ◽  
Author(s):  
Brandon M. Dawson ◽  
Matthew A. Franchek ◽  
Karolos Grigoriadis ◽  
Robert W. McCabe ◽  
Stephen B. Smith
Keyword(s):  
Instrumental Variable ◽  
Storage Capacity ◽  
Test Procedure ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Information Synthesis ◽  
Catalyst Temperature ◽  
Useful Life ◽  
Using Data ◽  
Three Way Catalyst

Presented is a method for model based diagnostics of automotive three-way catalysts (TWC). The model relates measurable engine inputs (engine air mass (AM) and catalyst temperature), to a metric indicating oxygen storage capacity, KTWC. The model structure is identified using orthogonal least squares (OLS). The model coefficients are estimated via the instrumental variable four step (IV4) approach. TWC diagnostics is realized using an information synthesis (IS) technique. This diagnostics method is experimentally validated using data from federal test procedure (FTP) driving cycle for a healthy (full useful life, FUL) and failed (threshold) TWC.

Autothermal Reforming of Propane Over Ni Catalysts Supported on a Variety of Perovskites

2007 ◽  
Vol 7 (11) ◽  
pp. 4013-4016 ◽  
Author(s):  
SeungSoo Lim ◽  
DongJu Moon ◽  
JongHo Kim ◽  
YoungChul Kim ◽  
NamCook Park ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Storage Capacity ◽  
Flow Reactor ◽  
Oxygen Storage Capacity ◽  
Autothermal Reforming ◽  
Oxygen Storage ◽  
Hydrogen Yield ◽  
Impregnation Method ◽  
Ni Catalysts ◽  
Atmospheric Flow

Autothermal reforming of propane for hydrogen over Ni catalysts supported on a variety of perovskites was performed in an atmospheric flow reactor. Perovskite is known for its higher thermal stability and oxygen storage capacity, but catalytic activity of itself is low. A sites of the ABO3 structured perovskites were occupied by La while B sites by one of Fe, Co, Ni, and Al by citrate method. The composition of the reactant mixture was H2O/C/O2 = 8.96/1.0/1.1. The changes in the states of the catalysts after reaction were analyzed by XRD, TPD, and TGA. Ni/LaAlO3 catalyst maintained the perovskite structure after reaction. It showed higher hydrogen yield and thermal stability compared to those of the catalysts with Fe, Co, or Ni in B sites. Catalysts prepared by deposition-precipitation (DP) method showed higher activity than those prepared by impregnation method, presumably due to the smaller sizes of the NiO crystal particles.

Mn3O4 doped with highly dispersed Zr species: a new non-noble metal oxide with enhanced activity for three-way catalysis

2016 ◽  
Vol 40 (12) ◽  
pp. 10108-10115 ◽  
Author(s):  
Genyuan Zhao ◽  
Jing Li ◽  
Wenshuang Zhu ◽  
Xueqin Ma ◽  
Yonghua Guo ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Manganese Oxide ◽  
Noble Metal ◽  
Storage Capacity ◽  
Catalytic Properties ◽  
Oxygen Storage Capacity ◽  
Oxide Catalysts ◽  
Oxygen Storage ◽  
Highly Dispersed ◽  
Three Way Catalysis

Herein, we demonstrate the influence of zirconium species on promoting the oxygen storage capacity and three-way catalytic properties of zirconium-manganese oxide catalysts.

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