Piperidine hydrogenolysis on a commercial hydrocracking catalyst II. The Effects of Initial Piperidine Concentration, Temperature, Catalyst Presulfidation, and Hydrogen Partial Pressure on Catalyst Activity, Deactivation, and Coke Formation

1992 ◽  
Vol 135 (1) ◽  
pp. 27-44 ◽  
Author(s):  
G HADJILOIZOU
Keyword(s):  
Partial Pressure ◽  
Catalyst Activity ◽  
Coke Formation ◽  
Hydrogen Partial Pressure ◽  
Hydrocracking Catalyst

Low Temperature Si Homoepitaxy: Effects of Impurities on Microstructure

1993 ◽  
Vol 312 ◽  
Author(s):  
D. P. Adamst ◽  
D. J. Eaglesham ◽  
S. M. Yalisove
Keyword(s):  
Surface Roughness ◽  
Low Temperature ◽  
Partial Pressure ◽  
Hydrogen Partial Pressure ◽  
Surface Roughening ◽  
Partial Pressures

AbstractHydrogen is shown to influence the surface roughness during low temperature Si MBE. Small partial pressures (1 × 10-7 Torr) of deuterium, introduced during Si growth at 310°C, are sufficient to increase the surface width to ∼30 Å before breakdown of epitaxy. This work is consistent with previous studies of the dependence of epitaxial thickness on hydrogen partial pressure and supports a model in which surface roughening leads to the breakdown of epitaxy.

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