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.

The Effect of Potassium Carbonate on the Catalytic Properties for Methane Conversion with Ceria

2012 ◽  
Vol 161 ◽  
pp. 194-199
Author(s):  
Yue Juan Duan ◽  
Hua Wang ◽  
Yong Gang Wei ◽  
Kong Zhai Li ◽  
Xing Zhu ◽  
...  
Keyword(s):  
Solid Solution ◽  
Storage Capacity ◽  
Catalytic Properties ◽  
Fixed Bed ◽  
Oxygen Storage Capacity ◽  
Fixed Bed Reactor ◽  
Oxygen Storage ◽  
Incipient Wetness Impregnation ◽  
Solid Reaction ◽  
Gaseous Oxidant

Pure CeO2and a series of (x %) K-CeO2(x=1, 2, 3, 4) catalysts were respectively prepared by the precipitation and incipient wetness impregnation methods, and characterized by means of XRD, BET and H2-TPR techniques. The catalytic activity was investigated by the gas-solid reaction with methane in the absence of gaseous oxidant in a fixed bed reactor at 800 °C. The XRD measurement showed that doping of K2CO3did not change the structure of CeO2with the addition of K2CO3 without formation of Ce-K-O solid solution in these materials. Surface area of catalysts wasSubscript textdecreased with the impregnation amount of K2CO3. Reducibility of catalysts was obviously enhanced by the addition of K2CO3as shown in H2-TPR tests. The catalysts activity tests indicated that adding K2CO3to CeO2could promote the oxygen storage capacity of catalysts. K species in CeO2could affect the CO formation in methane oxidation.

Assessment of Manganese Oxide and Cobalt Oxide Catalysts for Three Way Catalytic Converter

2020 ◽  
Vol 20 (4) ◽  
pp. 286-302
Author(s):  
Charula Patel ◽  
Nilesh Bhatt ◽  
Srinivas Palanki
Keyword(s):  
Metal Oxide ◽  
Manganese Oxide ◽  
Cobalt Oxide ◽  
Redox Reactions ◽  
Noble Metals ◽  
Catalytic Converter ◽  
Oxide Catalysts ◽  
Platinum Group Metals ◽  
Oxygen Storage ◽  
Metal Oxide Catalysts

Raising number of vehicles emits pollutants responsible for one third of total air pollution. Carbon monoxide (CO), unburned hydrocarbons (HC), and nitrogen oxides (NOx) are the main pollutants from petrol engines. It requires stringent vehicular emission norms to be followed for controlling it. Three Way Catalytic Converter (TWCC) contain Platinum Group Metals (PGMs) as catalyst to reduce exhaust emission and is widely used method that fulfills these standards. Because of high cost of PGMs and considerable advancement in metal oxide preparatory methods, metal oxide catalysts have gained more attraction. Manganese oxide (MnOx) and Cobalt Oxide (CoOx) have displayed impressive redox reactions at lower temperature. MnOx seems to be a suitable contender of Oxygen Storage Capacity (OSC) and Cobalt oxide (CoOx) has displayed an excellent catalytic activity for HC and CO oxidation. Hence, these catalysts attract the attention of researchers. Present paper assesses the prospect of MnOx and CoOx as catalysts for the TWCC for redox reactions of CO, HC and NOx and also in terms of OSC and T50 temperature. It is found that CoOx and MnOx both low cost metal oxide catalysts stand a good chance to replace the noble metals for TWCC.

Rational design of nanostructured, noble metal free, ceria–zirconia catalysts with outstanding low temperature oxygen storage capacity

2013 ◽  
Vol 1 (15) ◽  
pp. 4836 ◽  
Author(s):  
M. Pilar Yeste ◽  
Juan C. Hernández-Garrido ◽  
D. Carolina Arias ◽  
Ginesa Blanco ◽  
José M. Rodríguez-Izquierdo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Noble Metal ◽  
Rational Design ◽  
Storage Capacity ◽  
Oxygen Storage Capacity ◽  
Oxygen Storage ◽  
Metal Free
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