Study of the nature of active sites on zeolites by the measurement of heat of immersion. I. Electrostatic field of calcium-substituted Y zeolite

1970 ◽  
Vol 74 (13) ◽  
pp. 2710-2713 ◽  
Author(s):  
Kazuo Tsutsumi ◽  
Hiroshi Takahashi
Keyword(s):  
Electrostatic Field ◽  
Active Sites ◽  
Y Zeolite ◽  
Heat Of Immersion

Quantification of Electric Field inside the Protein Active Sites and Fullerenes

2021 ◽  
Author(s):  
Ambuj Dhakad ◽  
Subhrakant Jena ◽  
Dipak Kumar Sahoo ◽  
Himansu S. Biswal
Keyword(s):  
Electric Field ◽  
Electrostatic Field ◽  
Electrostatic Interactions ◽  
Active Sites ◽  
Biological Functions ◽  
Simple Method ◽  
Protein Active Sites

While electrostatic interactions are exceedingly accountable for biological functions, no simple method exists to directly estimate or measure the electrostatic field in the protein active sites. The electrostatic field inside...

scholarly journals Simple physical mixing of zeolite prevents sulfur deactivation of vanadia catalysts for NOx removal

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Inhak Song ◽  
Hwangho Lee ◽  
Se Won Jeon ◽  
Ismail A. M. Ibrahim ◽  
Joonwoo Kim ◽  
...  
Keyword(s):  
Active Sites ◽  
Catalytic Reduction ◽  
Dew Point ◽  
Environmental Catalysis ◽  
Y Zeolite ◽  
Sulfur Resistance ◽  
Industrial Facilities ◽  
Physical Mixing ◽  
Sulfur Deactivation ◽  
Huge Challenge

AbstractNOx abatement has been an indispensable part of environmental catalysis for decades. Selective catalytic reduction with ammonia using V2O5/TiO2 is an important technology for removing NOx emitted from industrial facilities. However, it has been a huge challenge for the catalyst to operate at low temperatures, because ammonium bisulfate (ABS) forms and causes deactivation by blocking the pores of the catalyst. Here, we report that physically mixed H-Y zeolite effectively protects vanadium active sites by trapping ABS in micropores. The mixed catalysts operate stably at a low temperature of 220 °C, which is below the dew point of ABS. The sulfur resistance of this system is fully maintained during repeated aging/regeneration cycles because the trapped ABS easily decomposes at 350 °C. Further investigations reveal that the pore structure and the amount of framework Al determined the trapping ability of various zeolites.

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