Subnanometer-sized Pt/Sn alloy cluster catalysts for the dehydrogenation of linear alkanes. Regarding the characterization of the catalysts, temperature‐programmed desorption (TPD) experiments of the freshly impregnated samples clearly established that the precursor salts used for B and P modification both almost completely decompose under release of H2O and NH3 at below the ODH reaction temperature of 673 K (Figure 1 a). In the ethane dehydrogenation, the reactant conversion and the selectivity to the products were calculated based on corrected peak area normalization method according to the equation in the following (the coke amount was low, which was not included in calculating the conversion and selectivity). Heterogene Katalysatoren – fundamental betrachtet. Zhengnan Yu, James A. Sawada, Weizhu An, Steven M. Kuznicki. Noncovalent functionalization of multi-walled carbon nanotubes as metal-free catalysts for the reduction of nitrobenzene. Optimization of Ethylene Production via Catalytic Partial Oxidation of Ethane on Pt–LaMnO3 Catalyst. 3 Working off-campus? The effect of support morphology on the reaction of oxidative dehydrogenation of ethane to ethylene at short contact times. Please check your email for instructions on resetting your password. Jesper J. H. B. Sattler, Javier Ruiz-Martinez, Eduardo Santillan-Jimenez, and Bert M. Weckhuysen . Cofeed experiments with 13C12CH6/12C2H4 indicated that both methane and ethyne are produced via ethene, and not directly from ethane. Carbon mediated catalysis: A review on oxidative dehydrogenation. O Macroporous materials: microfluidic fabrication, functionalization and applications. If you do not receive an email within 10 minutes, your email address may not be registered, Even though this reaction is technically realized at T>1200 K, the high dispersion of PxOy species and special characteristics of the nanotubes, such as the confinement effect, can bring about a higher reactivity. Number of times cited according to CrossRef: Chemoselective reduction of nitro and nitrile compounds using an Fe Calorimetric Study of Propane and Propylene Adsorption on the Active Surface of Multiwalled Carbon Nanotube Catalysts. Journal of Molecular Catalysis A: Chemical. Find more information about Crossref citation counts. @sp Furthermore, in comparison to metal oxide catalysts, which can operate at elevated temperatures, this performance is rather moderate.13 Figure 2 b shows the C2H4 selectivity as a function of C2H6 conversion at a somewhat higher temperature of 723 K. The superior performance of B‐ and P‐modified CNTs is clearly illustrated. Metal oxide residues were removed by nitric acid treatment (see the Supporting Information, Figures S3 and S4). Effects of nitrogen-, boron-, and phosphorus-doping or codoping on metal-free graphene catalysis. This change was due to the opening of closed tubes (see the Supporting Information, Figure S2) and the creation of surface defects on the outermost graphene layers. Due to capillary forces during CNT impregnation, the boron and phosphorus oxides were located mainly in the inner cavity of the CNTs. the Altmetric Attention Score and how the score is calculated. A two‐dimensional (2‐D) model, with mass and energy equations coupled with the Navier‐Stokes equations, is applied to show that an oxidation catalyst can beneficially affect the formation of ethylene, by optimizing the sacrifice of ethane for producing heat with a larger selectivity to CO 2 than a purely homogeneous process. You’ve supercharged your research process with ACS and Mendeley! The activation energy of the dehydrogenation of ethane over the present catalyst has in a previous study been determined to 116 kJ/mol [Virnovskaia, A.; Morandi, S.; Rytter, E.; Ghiotti, G.; Olsbye, U. Research progress in metal-free carbon-based catalysts. On the other hand, the barrier for chemical activation of alkanes increases with decreasing chain length.12 Thus, the oxidative activation of ethane and methane over carbon catalysts is highly challenging due to the limitation of the reaction conditions by the carbon catalyst combustion. Sodium tungstate-promoted CaMnO3 as an effective, phase-transition redox catalyst for redox oxidative cracking of cyclohexane. Benjamin Frank Dr. Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4–6,D‐14195 Berlin (Germany), Fax: (+49) 30‐84134405 . The latter is contradictory to the TPD results, but possibly resulted from the relatively slow thermal decomposition of the P2O5 precursor salt and its spreading on the CNTs surface masking the generation of new ketonic functionalities on the surface of P‐oCNTs. Activation processes of highly ordered carbon nanofibers in the oxidative dehydrogenation of ethylbenzene. Learn more. A numerical approach is used to investigate the role of a combustion catalyst in the oxidative dehydrogenation of ethane at short contact times for ethylene production. Synthesis of a molecularly defined single-active site heterogeneous catalyst for selective oxidation of N-heterocycles. A Metal-Free Carbon-Based Catalyst: An Overview and Directions for Future Research. Katalyse der Sauerstoffinsertion durch sp2‐Kohlenstoff. Ga3+-stabilized Pt in PtSn-Mg(Ga)(Al)O catalyst for promoting ethane dehydrogenation. Petrochemical Catalyst Materials, Processes, and Emerging Technologies. The formation of a mixed anhydride (carboxyphosphate) is one, albeit speculative, possibility to mask the anhydride functionality and cause this shift. In contrast to the ODH of propane or butane, in this case the carbon catalysts appeared to be a less promising alternative to established metal oxide catalysts, due to the lower reaction temperatures that can are applicable to the metal‐free system. Phosphate‐Modified Carbon Nanotubes in the Oxidative Dehydrogenation of Isopentanes. J. Phys. Impregnation of oCNTs decreased the surface areas to 360 and 294 m2 g−1 for the B‐oCNTs and P‐oCNTs, respectively. Recent Advances on the Catalysts for Activation of CO2 in Several Typical Processes. In addition, carbon is free of lattice or structural oxygen and can be used as a metal‐free catalyst, allowing for an in‐depth theoretical treatment.1 Industrially relevant ODH product yields, however, have been achieved only for ethylbenzene due to the kinetic stabilization of the product styrene by conjugated π electrons. Immobilizing Carbon Nanotubes on SiC Foam as a Monolith Catalyst for Oxidative Dehydrogenation Reactions. Jason Wu, Shaama Mallikarjun Sharada, Chris Ho, Andreas W. Hauser, Martin Head-Gordon, Alexis T. Bell. Such documents are peer‐reviewed, but not copy‐edited or typeset. 2 Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. Heteroatom‐Enhanced Metal‐Free Catalytic Performance of Carbocatalysts for Organic Transformations. Metal-Free Carbon Catalysts for Oxidative Dehydrogenation Reactions. The authors gratefully acknowledge assistance on experiments by Dr. J. Zhang (TEM) and E. Kitzelmann (TG MS). Guanidine Nitrate Enhanced Catalysis of Nitrogen‐Doped Carbon Nanotubes for Metal‐Free Styrene Production through Direct Dehydrogenation. n-Butane dehydrogenation over Pt/Mg(In)(Al)O. Licheng Liu, Hongtao Jiang, Haitao Liu, Huiquan Li. Catalytic behavior of decomposed molybdophosphoric acid supported on alumina for oxidative dehydrogenation of ethane to ethylene. Novel and Effective Copper-Aluminum Propane Dehydrogenation Catalysts. New insights into the oxidative dehydrogenation of propane on borate-modified nanodiamond. For ODH of propane, it was shown that both the combustion of the catalyst and the formation of electrophilic oxygen could be reduced by modification of carbon nanotubes with boron and phosphorus oxide.2 Besides an empirical test of activation capability for ethane, with a high CH bond strength of 420.5 kJ mol−1, this study also contains a kinetic approach to further investigate the nature of this protection effect and a thorough study of stable and unstable surface oxygen groups that might be involved in ODH catalysis.

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