Effect of Addition of Ce on the Catalytic Activity of Fe-Mn-O Catalyst for SCR of NOX with NH3

2011 ◽  
Vol 347-353 ◽  
pp. 453-456
Author(s):  
Hai Zhao ◽  
You Ning Xu ◽  
Duo Jiao Guan
Keyword(s):  
Nitric Oxide ◽  
Catalytic Activity ◽  
Analysis Data ◽  
Redox Properties ◽  
Nanosized Particles ◽  
Study Analysis ◽  
Catalytic Activities ◽  
Mn Oxide ◽  
Scr Of No ◽  
Mn Species

Fe-Mn oxide and Ce-doped Fe-Mn oxide nanosized particles were studied on the structural and catalytic activities for SCR. The catalysts were characterized by TEM, TPR and BET study. Analysis data show that the addition of Ce improves the reduction performance of Fe-Mn species. It was found that the Ce promoted samples exhibited much better activities for SCR of nitric oxide with ammonia because of the promotion of the structural and redox properties.

Enhanced Activity of Fe-Doped Cu/H-Sep for the SCR of NO with Propylene in the Presence of Oxygen

2014 ◽  
Vol 700 ◽  
pp. 261-264
Author(s):  
Yang Li ◽  
Qing Ye ◽  
Zhi Hao Zhang ◽  
Yun Fang Qi ◽  
Li Sha Liu
Keyword(s):  
Catalytic Activity ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Copper Species ◽  
Catalytic Activities ◽  
Support Interaction ◽  
Scr Of No ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Incipient Wetness

Cu/H-Sep and Cu-Fe/H-Sep samples were prepared by the incipient wetness impregnation method. These catalysts were characterized by means of XRF, XRD, BET, XPS, and H2-TPR techniques, and their catalytic activities were performed by the SCR of NO with propylene. The results show that the Cu-Fe/H-Sep catalyst exhibited the best performance in the C3H6-SCR of NO. After investigation by H2-TPR, XRD and XPS, the result showed that the higher reducibility, more amount of isolated Cu2+, higher dispersion of copper species, and stronger metal-support interaction were responsible for the excellent catalytic activity of Cu-Fe/H-Sep.

Selective catalytic reduction of nitric oxide with ammonia over high-activity Fe/SSZ-13 and Fe/one-pot-synthesized Cu-SSZ-13 catalysts

2016 ◽  
Vol 6 (20) ◽  
pp. 7561-7568 ◽  
Author(s):  
Chengyang Yin ◽  
Peifu Cheng ◽  
Xiang Li ◽  
Ralph T. Yang
Keyword(s):  
Nitric Oxide ◽  
High Activity ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
One Pot ◽  
Catalytic Activities ◽  
Scr Of No

Fe-impregnated one-pot-synthesized Cu-SSZ-13 catalysts showed excellent catalytic activities for the selective catalytic reduction (SCR) of NO with ammonia.

scholarly journals Development of palladium catalysts modified by ruthenium and molybdenum as anode in direct ethanol fuel cell

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Yonis Fornazier Filho ◽  
Ana Caroliny Carvalho da Cruz ◽  
Rolando Pedicini ◽  
José Ricardo Cezar Salgado ◽  
Priscilla Paiva Luz ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Palladium Catalysts ◽  
Carbon Support ◽  
X Ray Diffraction ◽  
Direct Ethanol Fuel Cell ◽  
Pd Catalysts ◽  
Bifunctional Mechanism ◽  
Catalytic Activities ◽  
Intrinsic Mechanism ◽  
Ternary Catalysts

AbstractPhysical and electrochemical properties of Pd catalysts combined with Ru and Mo on carbon support were investigated. To this end, Pd, Pd1.3Ru1.0, Pd3.2Ru1.3Mo1.0 and Pd1.5Ru0.8Mo1.0 were synthesized on Carbon Vulcan XC72 support by the method of thermal decomposition of polymeric precursors and then physically and electrochemically characterized. The highest reaction yields are obtained for Pd3.2Ru1.3Mo1.0/C and Pd1.5Ru0.8Mo1.0/C and, as demonstrated by thermal analysis, they also show the smallest metal/carbon ratio compared the other catalysts. XRD (X-ray Diffraction) and Raman analyses show the presence of PdO and RuO2 for the Pd/C and the Pd1.3Ru1.0/C catalysts, respectively, a fact not observed for the Pd3.2Ru1.3 Mo1.0 /C and the Pd1.5Ru0.8Mo1.0/C catalysts. The catalytic activities were tested for the ethanol oxidation in alkaline medium. Cyclic voltammetry (CV) shows Pd1.3Ru1.0/C exhibiting the highest peak of current density, followed by Pd3.2Ru1.3Mo1.0/C, Pd1.5Ru0.8Mo1.0/C and Pd/C. From, chronoamperometry (CA), it is possible to observe the lowest rate of poisoning for the Pd1.3Ru1.0/C, followed by Pd3.2Ru1.3Mo1.0/C, Pd1.5Ru0.8Mo1.0/C and Pd/C. These results suggested that catalytic activity of the binary and the ternary catalysts are improved in comparison with Pd/C. The presence of RuO2 activated the bifunctional mechanism and improved the catalytic activity in the Pd1.3Ru1.0/C catalyst. The addition of Mo in the catalysts enhanced the catalytic activity by the intrinsic mechanism, suggesting a synergistic effect between metals. In summary, we suggest that it is possible to synthesize ternary PdRuMo catalysts supported on Carbon Vulcan XC72, resulting in materials with lower poisoning rates and lower costs than Pd/C. Graphic abstract

Active Pd(ii) complexes: enhancing catalytic activity by ligand effect for carbonylation of methyl nitrite to dimethyl carbonate

2017 ◽  
Vol 7 (17) ◽  
pp. 3785-3790 ◽  
Author(s):  
Hong-Zi Tan ◽  
Zhi-Qiao Wang ◽  
Zhong-Ning Xu ◽  
Jing Sun ◽  
Zhe-Ning Chen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Dimethyl Carbonate ◽  
Ligand Effect ◽  
Methyl Nitrite ◽  
Catalytic Activities

The catalytic activities of Pd(ii) complexes for carbonylation of methyl nitrite to dimethyl carbonate could be enhanced by ligand effect.

Templated Synthesis of Pr-Doped Ceria with Improved Micro and Mesoporosity Porosity, Redox Properties and Catalytic Activity

2017 ◽  
Vol 148 (1) ◽  
pp. 258-266 ◽  
Author(s):  
Arantxa Davó-Quiñonero ◽  
Jorge González-Mira ◽  
Dolores Lozano-Castelló ◽  
Agustín Bueno-López
Keyword(s):  
Catalytic Activity ◽  
Redox Properties ◽  
Doped Ceria ◽  
Templated Synthesis

A graphdiyne-based carbon material for electroless deposition and stabilization of sub-nanometric Pd catalysts with extremely high catalytic activity

2019 ◽  
Vol 7 (21) ◽  
pp. 13142-13148 ◽  
Author(s):  
Liang-Liang Yang ◽  
Hong-Juan Wang ◽  
Juan Wang ◽  
Yu Li ◽  
Wen Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carbon Material ◽  
Electroless Deposition ◽  
Suzuki Coupling ◽  
High Catalytic Activity ◽  
Coupling Reactions ◽  
Pd Catalysts ◽  
Catalytic Activities

A new graphdiyne-based carbon material was synthesized as an ideal substrate for electroless deposition and stabilization of sub-nanometric Pd catalysts, which showed extremely high catalytic activities for the reduction of nitroarenes and Suzuki coupling reactions.

Synthesis of concave gold nanocuboids with high-index facets and their enhanced catalytic activity

2015 ◽  
Vol 51 (58) ◽  
pp. 11591-11594 ◽  
Author(s):  
Lidong Li ◽  
Yi Peng ◽  
Yonghai Yue ◽  
Ye Hu ◽  
Xiu Liang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Index ◽  
Catalytic Activities ◽  
Growth Method ◽  
Seed Mediated

Novel concave gold nanocuboids bounded by 24 high-index {611} facets are synthesized using the seed-mediated growth method via an overgrowth mechanism, which exhibit excellent catalytic activities over certain reactions.

scholarly journals In Vitro Hepatic Assessment of Cineole and Its Derivatives in Common Brushtail Possums (Trichosurus vulpecula) and Rodents

Biology ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1326
Author(s):  
Ravneel R. Chand ◽  
Mhairi Nimick ◽  
Belinda Cridge ◽  
Rhonda J. Rosengren
Keyword(s):  
Catalytic Activity ◽  
Management Strategies ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Cytochrome P450 3A ◽  
Phascolarctos Cinereus ◽  
Catalytic Activities ◽  
Rats And Mice ◽  
Drug Metabolising Enzymes

Folivore marsupials, such as brushtail possum (Trichosurus Vulpecula) and koala (Phascolarctos cinereus), can metabolise higher levels of dietary terpenes, such as cineole, that are toxic to eutherian mammals. While the highly efficient drug metabolising enzymes, cytochrome P450 3A (CYP3A) and phase II conjugating enzymes (UDP-glucuronosyltransferase, UGT), are involved in the metabolism of high levels of dietary terpenes, evidence for inhibitory actions on these enzymes by these terpenes is scant. Thus, this study investigated the effect of cineole and its derivatives on catalytic activities of hepatic CYP3A and UGT in mice, rats, and possums. Results showed that cineole (up to 50 µM) and its derivatives (up to 25 µM) did not significantly inhibit CYP3A and UGT activities in mice, rats, and possums (both in silico and in vitro). Interestingly, basal hepatic CYP3A catalytic activity in the possums was ~20% lower than that in rats and mice. In contrast, possums had ~2-fold higher UGT catalytic activity when compared to mice and rats. Thus, these basal enzymatic differences may be further exploited in future pest management strategies.

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