Characterization of H and Cu mordenites with varying SiO2/Al2O3 ratios, by optical spectroscopy, MAS NMR of 29Si, 27Al and 1H, temperature programmed desorption and catalytic activity for nitrogen oxide reduction

2002 ◽  
pp. 815-822 ◽  
Author(s):  
V. Petranovskii ◽  
R.F. Marzke ◽  
G. Diaz ◽  
A. Gomez ◽  
N. Bogdanchikova ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Nitrogen Oxide ◽  
Optical Spectroscopy ◽  
Temperature Programmed Desorption ◽  
Mas Nmr ◽  
Oxide Reduction ◽  
Nitrogen Oxide Reduction ◽  
Temperature Programmed

scholarly journals Nitrogen oxide reduction through absorbent solutions containing nitric acid and hydrogen peroxide in hollow fiber membrane modules

Heliyon ◽  
2019 ◽  
Vol 5 (12) ◽  
pp. e02987 ◽  
Author(s):  
Sutrasno Kartohardjono ◽  
Clarissa Merry ◽  
Mohamad Sofwan Rizky ◽  
Catharina Candra Pratita
Keyword(s):  
Hydrogen Peroxide ◽  
Nitric Acid ◽  
Nitrogen Oxide ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Oxide Reduction ◽  
Fiber Membrane ◽  
Nitrogen Oxide Reduction ◽  
Membrane Modules

scholarly journals In-Exchanged CHA Zeolites for Selective Dehydrogenation of Ethane: Characterization and Effect of Zeolite Framework Type

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 807
Author(s):  
Zen Maeno ◽  
Xiaopeng Wu ◽  
Shunsaku Yasumura ◽  
Takashi Toyao ◽  
Yasuharu Kanda ◽  
...  
Keyword(s):  
Active Sites ◽  
Temperature Programmed Desorption ◽  
X Ray Diffraction ◽  
Zeolite Framework ◽  
X Ray ◽  
Catalytic Activities ◽  
Ethane Dehydrogenation ◽  
Temperature Programmed

In this study, the characterization of In-exchanged CHA zeolite (In-CHA (SiO2/Al2O3 = 22.3)) was conducted by in-situ X-ray diffraction (XRD) and ammonia temperature-programmed desorption (NH3-TPD). We also prepared other In-exchanged zeolites with different zeolite structures (In-MFI (SiO2/Al2O3 = 22.3), In-MOR (SiO2/Al2O3 = 20), and In-BEA (SiO2/Al2O3 = 25)) and different SiO2/Al2O3 ratios (In-CHA(Al-rich) (SiO2/Al2O3 = 13.7)). Their catalytic activities in nonoxidative ethane dehydrogenation were compared. Among the tested catalysts, In-CHA(Al-rich) provided the highest conversion. From kinetic experiments and in-situ Fourier transform infrared (FTIR) spectroscopy, [InH2]+ ions are formed regardless of SiO2/Al2O3 ratio, serving as the active sites.

Modeling effects of H2S on electron competition among nitrogen oxide reduction and N2O accumulation during denitrification

2019 ◽  
Vol 5 (3) ◽  
pp. 533-542
Author(s):  
Yuting Pan ◽  
Yiwen Liu ◽  
Dongbo Wang ◽  
Bing-Jie Ni
Keyword(s):  
Nitrogen Oxide ◽  
Carbon Oxidation ◽  
Oxide Reduction ◽  
Nitrogen Reduction ◽  
Nitrogen Oxide Reduction ◽  
Electron Carriers ◽  
Novel Model

A novel model was developed to describe electron competition during three-step denitrification through linking nitrogen reduction and carbon oxidation with electron carriers.

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