Dehydrogenation n-butane

Diadsorbed diolefins, 30 33 Diadsorbed species, 30 61, 71 Diagonalized matrix, 32 284—286, 288 ammonia synthesis, 32 294—297 n-butane dehydrogenation, 32 309-313 butenes isomerization, 32 305-308 1-butene to 1,3-butadiene dehydrogenation, 32 297-298... 

Pt-Sn Coking allowed, then regeneration cycles carried out n-Butane dehydrogenation, TEM, Mossbauer, H2 chemisorption. 

In order to get better understanding of the role of gallium and acid sites in n-butane transformation over Ga-containing catalysts, we have considered the rate data obtained over H- and Ga-theta-1 catalysts. These catalysts were chosen, since they produced much better results when compared with the ferrierite-based catalysts. Consequently, the activities of the theta-1 catalysts in the initial n-butane dehydrogenation and cracking steps were determined. This was done by the extrapolation of the rate data on formation of the primary reaction products (hydrogen, methane and ethane) to zero n-butane conversions, as shown in Figure 3. 

Fig, 2 Conversion and selectivity of n butane dehydrogenation on Catalyst B with different treatment... 

In order to compare the nature of the carbon deposits on Pc and Pt-Sn catalysts, carbon deposition on three catalysts with different Sn/Pt ratio was carried out in the in situ reaction and TPO system for n-butane dehydrogenation and successive temperature programmed oxidation. The areas of Peaks 1 and 2 of the TPO profiles of the three catalysts after carbon deposition were resolved and detemnined by an integraph. The ratios of areas of Peak 1 to Peak 2 of the TPO profiles were calculated and ploued against the Sn/Pt ratio in Fig. 4. Becanse the addition of Sn can inhibit the cart)on deposition on metallic surfaces, the proportion of Peak 1 to Peak 2 decreases with the increasing of Sn/Pt ratio These results imply that the ratio of carbon deposits on metal surfaces to total carbon deposits decreases with the incorporation of tin. 

After partial oxidation of a coked catalyst, the first peak of the TPO profile disappears, and the activity for n-butane dehydrogenation is completely recovered. A significant amount of graphitic carbon is detected by TEM and SAED examination of the residual carbon on Pt-Sn catalysts after partial oxidation. This implies that the first peak of the I PO profile corresponds to carbon deposits located mainly on the metal surface, wrhi e the second one derives from the more graphite-like carbon located on the support. 

Lummus Technology Butadiene Butane-n or mixed C s CATADIENE n-butane dehydrogenation process uses mulitple fixed-bed reactors in cyclic operation to produce butadiene. 18 1986... 

Loc LC, Gaidai NA, Kiperman SL, et al Kinetics of propane and n-butane dehydrogenation over platinum-alumina catalysts in the presence of hydrogen and water vapor, Kinet Catal 37(6) 790-796, 1996. 

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