Catalytic activity of type Y zeolites in the hydrogenation of ethylene and butenes

1975 ◽  
Vol 24 (8) ◽  
pp. 1608-1613
Author(s):  
Kh. M. Minachev ◽  
Yu. S. Khodakov ◽  
B. M. Savchenko ◽  
V. K. Nesterov
Keyword(s):  
Catalytic Activity ◽  
Y Zeolites ◽  
Hydrogenation Of Ethylene

Transformation of methanol to hydrocarbons over Y zeolites with varying Si/Al ratio

1987 ◽  
Vol 52 (7) ◽  
pp. 1701-1707 ◽  
Author(s):  
Miloslav Křivánek ◽  
Nguyen Thiet Dung ◽  
Pavel Jírů
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Coke Formation ◽  
Aliphatic Hydrocarbons ◽  
Y Zeolite ◽  
Y Zeolites ◽  
Methanol To Hydrocarbons

The catalytic activity of Na, H-Y zeolite samples with a varying Si/Al ratio (2·5 to 20) in the transformation of methanol was determined. The amounts of formed individual aliphatic hydrocarbons as function of reaction time were correlated with the amount of Bronsted and Lewis centres on the catalysts. The effect of coke formation on the over-all course of the reaction has been demonstrated.

Catalytic activity of differently prepared, fully exchanged lanthanum Y zeolites

Zeolites ◽  
1988 ◽  
Vol 8 (3) ◽  
pp. 228-231 ◽  
Author(s):  
David Keir ◽  
Edward F.T. Lee ◽  
Lovat V.C. Rees
Keyword(s):  
Catalytic Activity ◽  
Y Zeolites

Effect of Li, Na, K and Cs on Vacuum Decomposition of Tetraammineplatinum(II) in Zeolites. Catalytic Activity in CO + NO Reaction

1995 ◽  
Vol 60 (3) ◽  
pp. 428-442 ◽  
Author(s):  
Jana Nováková ◽  
Libor Brabec ◽  
Ludmila Kubelková
Keyword(s):  
Catalytic Activity ◽  
Decomposition Rate ◽  
Reaction Rate ◽  
Hydrogen Reduction ◽  
Pt Catalyst ◽  
Y Zeolites ◽  
Oxygen Layer ◽  
Zeolite Structure ◽  
X Zeolites ◽  
Vacuum Decomposition

[Pt(NH3)4]2+ ions were exchanged for alkali (Li, Na, K and Cs) in -X and -Y zeolites and decomposed in vacuum. TPR after this decomposition showed that autoreduction accompanying this process reduced roughly 2/3 of all Pt2+ to Pt0. The extent of the autoreduction rose with the ammonia pressure over the zeolite. The decomposition rate increased with increasing electropositivity of the alkali ion and this effect completely overlapped that of the zeolite structure. The CO + NO reaction rate also increased from Li to Cs, but -X zeolites were substantially more active than the -Y ones. Oxygen layer on the resulting Pt catalyst affected positively the reaction rate. The dispersion of Pt particles was relatively low, when compared to that obtained by decomposition of the Pt tetraammine complex in oxygen followed by hydrogen reduction. However, the reaction rate was higher.

Dispersion and catalytic activity of molybdenum supported on Y zeolites

1987 ◽  
Vol 40 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Takayuki Komatsu ◽  
Tatsuaki Yashima
Keyword(s):  
Catalytic Activity ◽  
Y Zeolites
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