Alkali-Poisoning-Resistant Fe2O3/MoO3/TiO2 Catalyst for the Selective Reduction of NO by NH3: The Role of the MoO3 Safety Buffer in Protecting Surface Active Sites

2019 ◽  
Author(s):  
Jie Zhang ◽  
Zhiwei Huang ◽  
Yueyao Du ◽  
Xiaomin Wu ◽  
Huazhen Shen ◽  
...  
Keyword(s):  
Active Sites ◽  
Selective Reduction ◽  
Reduction Of No ◽  
Tio2 Catalyst ◽  
Surface Active

Role of the Structure and Electronic Properties of Fe2O3-MoO3 Catalyst on the Dehydration of Isopropyl Alcohol

1993 ◽  
Vol 58 (7) ◽  
pp. 1591-1599 ◽  
Author(s):  
Abd El-Aziz A. Said
Keyword(s):  
Active Sites ◽  
Isopropyl Alcohol ◽  
Oxide Catalyst ◽  
Flow System ◽  
Charge Carriers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Catalyst Composition ◽  
Surface Active

Molybdenum oxide catalyst doped or mixed with (1 - 50) mole % Fe3+ ions were prepared. The structure of the original samples and the samples calcined at 400 °C were characterized using DTA, X-ray diffraction and IR spectra. Measurements of the electrical conductivity of calcined samples with and without isopropyl alcohol revealed that the conductance increases on increasing the content of Fe3+ ions up to 50 mole %. The activation energies of charge carriers were determined in presence and absence of the alcohol. The catalytic dehydration of isopropyl alcohol was carried out at 250 °C using a flow system. The results obtained showed that the doped or mixed catalysts are active and selective towards propene formation. However, the catalyst containing 40 mole % Fe3+ ions exhibited the highest activity and selectivity. Correlations were attempted to the catalyst composition with their electronic and catalytic properties. Probable mechanism for the dehydration process is proposed in terms of surface active sites.

Silver-alumina catalysts for selective reduction of NO by higher hydrocarbons: structure of active sites and reaction mechanism

2001 ◽  
Vol 30 (1-2) ◽  
pp. 151-162 ◽  
Author(s):  
Ken-ichi Shimizu ◽  
Junji Shibata ◽  
Hisao Yoshida ◽  
Atsushi Satsuma ◽  
Tadashi Hattori
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Selective Reduction ◽  
Reduction Of No ◽  
Higher Hydrocarbons ◽  
Alumina Catalysts

The preparation of V2O5/TiO2 catalyst supported on the ceramic filter candle for selective reduction of NO

2001 ◽  
Vol 18 (4) ◽  
pp. 456-462 ◽  
Author(s):  
Joo-Hong Choi ◽  
Sung-Kyoung Kim ◽  
Sun-Jong Ha ◽  
Young-Ok Park
Keyword(s):  
Selective Reduction ◽  
Ceramic Filter ◽  
Reduction Of No ◽  
Tio2 Catalyst

scholarly journals Dynamics and fragmentation mechanism of (C5H4CH3)Pt(CH3)3 on SiO2 surfaces

2018 ◽  
Vol 9 ◽  
pp. 711-720 ◽  
Author(s):  
Kaliappan Muthukumar ◽  
Harald O Jeschke ◽  
Roser Valentí
Keyword(s):  
Electron Beam ◽  
Active Sites ◽  
Density Functional ◽  
Fragmentation Mechanism ◽  
Functional Theory ◽  
Before And After ◽  
Surface Active ◽  
Dynamics Simulations ◽  
Precursor Molecules

The interaction of trimethyl(methylcyclopentadienyl)platinum(IV) ((C5H4CH3)Pt(CH3)3) molecules on fully and partially hydroxylated SiO2 surfaces, as well as the dynamics of this interaction were investigated using density functional theory (DFT) and finite temperature DFT-based molecular dynamics simulations. Fully and partially hydroxylated surfaces represent substrates before and after electron beam treatment and this study examines the role of electron beam pretreatment on the substrates in the initial stages of precursor dissociation and formation of Pt deposits. Our simulations show that on fully hydroxylated surfaces or untreated surfaces, the precursor molecules remain inactivated while we observe fragmentation of (C5H4CH3)Pt(CH3)3 on partially hydroxylated surfaces. The behavior of precursor molecules on the partially hydroxylated surfaces has been found to depend on the initial orientation of the molecule and the distribution of surface active sites. Based on the observations from the simulations and available experiments, we discuss possible dissociation channels of the precursor.

Unmodified SBA-15 adsorbents for the removal and separation of Th(IV) and U(VI) ions: the role of pore channels and surface-active sites

2018 ◽  
Vol 54 (17) ◽  
pp. 2863-2878 ◽  
Author(s):  
Leila Dolatyari ◽  
Mehri Shateri ◽  
Mohammad Reza Yaftian ◽  
Sadegh Rostamnia
Keyword(s):  
Active Sites ◽  
Surface Active

Role of carboxylic acid groups in the reduction of nitric oxide by carbon at low temperature, as exemplified by graphene oxide

2017 ◽  
Vol 19 (33) ◽  
pp. 22462-22471 ◽  
Author(s):  
J. Zhang ◽  
Q. Gao ◽  
X. M. Li ◽  
J. Z. Zhou ◽  
X. X. Ruan ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Graphene Oxide ◽  
Carboxylic Acid ◽  
Low Temperature ◽  
Active Sites ◽  
Reduction Of No ◽  
Carboxylic Acid Groups ◽  
Nano Carbon ◽  
First Time

This work reported the reduction of NO by carboxylic acid groups and the derived active sites on nano-carbon at a temperature as low as 100 °C for the first time.

Sign in / Sign up

Export Citation Format

Share Document