Product ethene

The contribution deals with the catalytic performance of V-, Co-, and Ni-based microporous (MFI), mesoporous (HMS) and alumina catalysts in ODH of ethane. Representative catalysts contained between 2.9 and 3.9 wt.% of metal. Ni-, V- and Co-A1203, and V- and Ni-HMS were effective catalysts in ODH of ethane. However, Ni-A1203 had the best selectivity-conversion behavior. The most favorable set up corresponded to 46 % in the ethane conversion, 30 % in the ethene yield 30 %, 65 % in the selectivity to ethene, and 0.91 g(C2=).gca, 1.h 1 in the ethene productivity for Ni-A1203. The activity was stable for 6 hours time-on-stream. 

Ethylbenzene and propene. The former is produced from benzene and ethene. Product Use... 

Addition of excess d0-ethene to the reaction mixture did not affect the ethene-d2/ 4 product ratio, which means that the ethene products do not react with each other once formed. Moreover, mass spectral analysis of 11 and 12 both before the reaction started and after a short reaction time showed no scrambling of label between the two starting materials. This suggests that 11 and 12 must interact separately with the metal catalyst during metathesis and do not interact with each other before metathesis. Mechanism 3 best explains all of these results. 

Centi, G. (1993). Vanadyl Pyrophosphate A Critical Overview, Catal. Today, 16, pp. 5-26. Lopez Nieto, J., Botella Asuncion, P., Vazquez Navarro, M., et al. (2003). Worldwide Patent 2003064035 Al, Method for the Oxidative Dehydrogenation of Ethane (CSIC-UPV). Heracleous, E. and Lemonidou, A. (2006). Ni-Nb-O Mixed Oxides as Flighly Active and Selective Catalysts for Ethene Production via Ethane Oxidative Dehydrogenation. Part I Characterization and Catalytic Performance, J. Catal., 237, pp. 162-174. 

Heracleous, E. and Lemonidou, A. (2006). Ni-Nb-O Mixed Oxides as Highly Active and Selective Catalysts for Ethene Production via Ethane Oxidative Dehydrogenation. Part II Mechanistic Aspects and Kinetic Modeling, J. Catal., 237, pp. 175-189. 

Hakonsen, S., Walmsley, J. and Holmen, A. (2010). Ethene Production by Oxidative Dehydrogenation of Ethane at Short Contact Times over Pt-Sn Coated Monoliths, Appl Catal A Gen., 378, pp. 1-10. 

However, despite its prospective cost-effectiveness, commercialization attempts at such high temperature reactimis (T = 873-1 173 K) have not been successful so far because of the low C2 yields. As a matter of fact, the current commercialized process for ethene production is based on the pyrolysis of naphtha or the steam-based dehydrogenation of ethane [8], Returning to oxidative coupling reactions, to prevent loss of C2, the utilization of an oxidant softer than O2 is desirable [7, 8], which does not promote the formation of radicals. CO2 can play such a role and offers interesting advantages over O2 because utilization of CO2 prevents deep... 

Ethene product D2C CHD and DHC CHD formed here the ratio of the two isomers was temperature dependent. 

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