Dehydrogenation of ethane to ethylene

Dehydrogenation of Ethane to Ethylene Porous AI2O3 membranes Nonporous Pd/Ag membranes Fumeaux, Davidson and Ball (1987) Pfefferie (1966)... 

Another route to ethylbenzene is available for those remote places where olefin plants or refinery crackers are not nearby but a supply of ethane is— catalytic dehydrogenation of ethane to ethylene followed by its reaction with benzene to produce EB. The first of two steps in Figure 8-4 use a gallium zinc zeolyte catalyst that promotes ethane dehydrogenation to ethylerie at 86% selectivity and up to 50% conversion per pass. 

We have a catalyst that causes the oxidative dehydrogenation of ethane to ethylene... 

In early 1997, Schuurman, et al. reported Ni-based catalysts for the oxidative dehydrogenation of ethane to ethylene [12], but with only a limited ability to explore composition space the results were not compelling, and the real potential for Ni-based systems was missed. Tab. 1.1 shows secondary screening performance data for pure Ni oxide and binary and ternary Ni compositions containing Ta and Nb. The pure Ni catalyst is poor in terms of both conversion (11%) and selectivity (54%). The Ni catalyst containing 12% Ta was essentially the same (12% conversion and 55% selectivity). Increasing the Ta concentration in the binary to 38%... 

Micro structured wells (2 mm x 2 mm x 0.2 mm) on the catalyst quartz wafer were manufactured by sandblasting with alumina powder through steel masks [7]. Each well was filled with mg catalyst. This 16 x 16 array of micro reactors was supplied with reagents by a micro fabricated gas distribution wafer, which also acted as a pressure restriction. The products were trapped on an absorbent plate by chemical reaction, condensation or absorption. The absorbent array was removed from the reactor and sprayed with dye solution to obtain a color reaction, which was then used for the detection of active catalysts by a CCD camera. Alternatively, the analysis was also carried out with a scanning mass spectrometer. The above-described reactor configuration was used for the primary screening of the oxidative dehydrogenation of ethane to ethylene, the selective oxidation of ethane to acetic acid, and the selective ammonoxidation of propane to acrylonitrile. 

In this set-up, two new catalysts were found for the oxidative dehydrogenation of ethane to ethylene. With catalysts Cr/Mo-Ox and Co/Cr/Sn/W-Ox an industrially relevant product yield of more than 60% was reached, as shown in Figure 3.54. 

Volpe, A. F., Weinberg, W. H., Woo, L., Zysk, J., Combinatorial heterogeneous catalysis oxidative dehydrogenation of ethane to ethylene, selective oxidation of ethane to acetic acid, and selective ammonoxidation of propane to acrylonitrile, Top. Catal. 2003, 23, 65-79. 

Dehydrogenation is a reaction that results in the removal of hydrogen from an organic compound or compounds, as in the dehydrogenation of ethane to ethylene ... 

As in previous investigations [63, 64], the oxidative dehydrogenation of ethane to ethylene was chosen as a model reaction for an experimental study on the laboratory scale. A VOx/y-AhCti catalyst with 1.4 % V was used, and prepared using standard techniques described in Ref. [65]. The particle size of the support was 1.8 mm. 

Use of the Oleflex process for the dehydrogenation of ethane to ethylene has also been investigated but, to date, the economics do not appear to be favorable because of the low equilibrium conversion and the need to operate at a pressure lower than atmospheric if a reasonable ethane conversion is to be expected ... 

Oxidative Dehydrogenation of Ethane to Ethylene over Sr-Promoted La203 Catalyst Supported on Low Surface Area Porous Catalyst Carrier... 

Figure 1 shows a strong influence of Sr/La ratio, particularly at lower Sr/La ratios, on the conversion of C2Hg, O2, selectivity for C2H4, C2+ olefins, C3+ paraffins, CH4, CO, and CO/CO2 ratio in product in the oxidative dehydrogenation of ethane to ethylene. The results on the these catalysts show that the catalyst with Sr/La = 0.3 gives best performance in the oxidative dehydrogenation of ethane. The influence of Sr/La ratio on the catalyst performance is as follows. 

Figure 1. Effect of Sr/La ratio on the ethane and O2 conversion, product selectivity and CO/CO2 ratio in the oxidative dehydrogenation of ethane to ethylene over Sr-La2O3/SA-5205 catalyst [ Reaction condition Temperature = 700°C, C2H5/O2 = 6.0, steam/C2H6 = 1.0, space velocity = 100,104 cm. g. h ].

The study presented was based on reaUstic data originating from the important class of partial oxidation reactions that might be favorably performed in such membrane reactors. The oxidative dehydrogenation of ethane to ethylene using a vanadium oxide catalyst was considered. Concerning the properties of the membranes different permeabilities were studied, being in the range of currently available porous materials. 

Coronas,)., Menendez, M. and Santamaria, )., 1995. Use of a Ceramic Membrane Reactor for the Oxidative Dehydrogenation of Ethane to Ethylene and Higher Hydrocarbons. Industrial Engineering Chemistry Research, 34(12) 4229 4234. 

Wang H, Cong Y and Yang W S (2002), High selectivity of oxidative dehydrogenation of ethane to ethylene in an oxygen permeable membrane reactor , Chem Commun, 14,1468-1469. 

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