Download : Download high-res image (144KB)Download : Download full-size image. Working off-campus? ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Oxidative dehydrogenation of ethylbenzene to styrene over carbonaceous catalysts. With the catalyst that exhibited the best results, MnO2–ZrO2, additional experiments with different oxidation states were carried out in order to determine the influence on its activity and redox properties to assess the feasibility of using CO2 as a regenerating agent during the ethylbenzene dehydrogenation reaction. and you may need to create a new Wiley Online Library account. Styrene Production from Ethylbenzene Objective: • A “Mini-plant” which represents the main parts of the entire in-dustrial process, including recycle streams, has to be operated: • isothermally operated reactor for dehydrogenation of ethylbenzene to styrene (catalyst bed … 1a). Number of times cited according to CrossRef: Catalytic conversions of CO2 to help mitigate climate change: Recent process developments. Styrene has been produced by ethylbenzene dehydrogenation over iron oxide catalyst with a large excess of superheated steam. Together with the characterization results of XRD, TGA, and DR UV–Vis spectroscopy, the deep reduction of V5+ into V3+ during CO2‐ODEB is the main reason for the deactivation of the supported vanadia catalyst, while the coke deposition has a less important impact on the catalyst stability. Process Safety and Environmental Protection. Catalytic performance of Al‐MCM‐41‐supported vanadia catalysts (V/Al‐MCM‐41) with different V loading was investigated for oxidative dehydrogenation of ethylbenzene to styrene (ST) with CO 2 (CO 2 ‐ODEB).

https://doi.org/10.1016/j.cattod.2012.07.019. The effects of oxygen concentration in the carrier gas, contact time, and the addition of dopants and inhibitors to the reaction have been studied. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, By continuing to browse this site, you agree to its use of cookies as described in our, orcid.org/https://orcid.org/0000-0003-0011-1627, I have read and accept the Wiley Online Library Terms and Conditions of Use. For comparison, pure silica MCM‐41 was also used as support for vanadia catalyst. styrene ethylbenzene reaction steam pressure Prior art date 1968-05-09 Legal status (The legal status is an assumption and is not a legal conclusion. Copyright © 1994 Published by Elsevier B.V. https://doi.org/10.1016/0926-860X(94)80213-0. Activity and coke generation of catalysts in ethylbenzene dehydrogenation to produce styrene were studied. Learn about our remote access options, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024 China. ► The addition of the appropriate amount of CO2 can counteract the catalyst deactivation to operate continuously. We use cookies to help provide and enhance our service and tailor content and ads. The model discrimination and parameter estimation was based on an extensive set of experiments that were conducted in a tubular reactor. The experiments consisted of a reduction test with H2, oxidation with CO2, reaction with ethylbenzene, regeneration with CO2 and coke combustion and reoxidation with O2. CO 2 is able to reoxidize the catalysts and partially regenerate it. Changes in these variables produce substantial changes in the conversion and selectivity of the reaction. Compared with the MCM‐41‐supported catalyst, the Al‐MCM‐41‐supported vanadia catalyst exhibits much higher catalytic activity and stability along with a high ST selectivity (>98%). ► Pulse plant has been designed to carry out transient experiments of four catalysts. By proper selection of conditions, the results of these studies indicate that comparable conversions and selectivities can be attained with these catalysts at significantly lower temperatures than those reported for metal oxide catalysts. By continuing you agree to the use of cookies. Copyright © 2020 Elsevier B.V. or its licensors or contributors. The … MnO 2 –ZrO 2 catalyst exhibited the best performance and stability.

The superior catalytic performance of the present V/Al‐MCM‐41 catalyst can be attributed to the Al‐MCM‐41 support being more favorable for the high dispersion of V species and the stabilization of active V5+ species. The inlet molar flow rate of Ethylbenzene is 13.5 lbmol/hr. Oxidative dehydrogenation of ethylbenzene to styrene over the CoFe 2 O 4 –MCM-41 catalyst: preferential adsorption on the O 2− Fe 3+ O 2− sites located at octahedral positions M. da Costa Borges Soares, F. F. Barbosa, M. A. M. Torres, A. Valentini, A. dos Reis Albuquerque, J. R. Sambrano, S. B. C. Pergher, N. Essayem and T. P. Braga, Catal.

The results indicate that the catalytic behavior and the nature of V species depend strongly on the V loading and the support properties. Catalytic performance of Al‐MCM‐41‐supported vanadia catalysts (V/Al‐MCM‐41) with different V loading was investigated for oxidative dehydrogenation of ethylbenzene to styrene (ST) with CO2 (CO2‐ODEB). By continuing you agree to the use of cookies. Sci. A set of intrinsic rate equations based on the Hougen—Watson formalism was derived for the dehydrogenation of ethylbenzene into styrene on a commercial potassium-promoted iron catalyst. If you do not receive an email within 10 minutes, your email address may not be registered, The full text of this article hosted at iucr.org is unavailable due to technical difficulties. Among the different loadings of V2O5, the 5 wt% V2O5/TiO2–Al2O3 catalyst exhibited better activity. Copyright © 2012 Elsevier B.V. All rights reserved. Briefly, the OLC catalyst exhibited an activation period of about 2 h, from a minor initial activity to a conversion level of 92% at the steady-state, with an almost stable styrene selectivity at 68% allowing a high stable yield of 62% to be obtained (Fig. The catalytic activity of some carbonaceous adsorbents in the oxidative dehydrogenation of ethyl-benzene was investigated. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) One of the shortcomings of this reaction is coke formation.

The catalysts were characterized by N2 adsorption, X‐ray diffraction (XRD) pyridine‐Fourier‐transform infrared spectroscopy, H2‐temperature‐programmed reduction, thermogravimetric analysis (TGA), UV‐Raman, and diffuse reflectance (DR) UV–vis spectroscopy. Studies with inhibitors suggest the cause of coke formation and methods for inhibiting it. ► CO2 is able to reoxidize the catalysts and partially regenerate it. Building, Room 408, Gainesville, FL 32611-2046, USA (Received 26 August 1993, revised manuscript received 24 November 1993) … Shuwei Chen, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China. ethylbenzene to styrene at 788 K, compared with that of OLC. Expired - Lifetime Application number Inventor Charles V Berger Current Assignee (The listed assignees may be inaccurate. These experiments were carried out at three temperatures (450, 500 and 550 °C). Ruifeng Li, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China. appliedcatalysis A ELSEV 1ER Applied Catalysis A: General 112 (1994) 117-124 Oxidative dehydrogenation of ethylbenzene to styrene over carbonaceous catalysts Russell S. Drago*, Krzysztof Jurczyk University of Florida, Department of Chemistry, Chemistry Lab. ► Activity and coke generation of catalysts in ethylbenzene dehydrogenation to produce styrene were studied. In this work, a pulse plant has been used to study the redox properties, activity and coke generation of four catalysts in ethylbenzene dehydrogenation to produce styrene. Learn more. Large excess of steam is added to the feed at a rate of 270 lbmol/hr. For comparison, pure silica MCM‐41 was also used as support for vanadia catalyst. Use the link below to share a full-text version of this article with your friends and colleagues. We use cookies to help provide and enhance our service and tailor content and ads. A physicochemical and structural characterization was carried out in order to verify possible changes in the catalysts after the tests.

► MnO2–ZrO2 catalyst exhibited the best performance and stability. Highlights Pulse plant has been designed to carry out transient experiments of four catalysts. Copyright © 2020 Elsevier B.V. or its licensors or contributors. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Catalysts for the production of styrene from ethylbenzene: Redox and deactivation study. CO2 was used as weak oxidant.

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