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Title: The role of CO2 as a soft oxidant for dehydrogenation of ethylbenzene to styrene over a high-surface-area ceria catalyst

Journal Article · · ACS Catalysis
 [1];  [1];  [2];  [2];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Iowa State Univ., Ames, IA (United States); Ames Lab., Ames, IA (United States)

Catalytic performance and the nature of surface adsorbates were investigated for high-surface-area ceria during the ethylbenzene oxidative dehydrogenation (ODH) reaction using CO2 as a soft oxidant. The high surface area ceria material was synthesized using a template-assisted method. The interactions among ethylbenzene, styrene, and CO2 on the surface of ceria and the role of CO2 for the ethylbenzene ODH reaction have been investigated in detail by using activity test, in situ diffuse reflectance infrared and Raman spectroscopy. CO2 as an oxidant not only favored the higher yield of styrene but also inhibited the deposition of coke during the ethylbenzene ODH reaction. Ethylbenzene ODH reaction over ceria followed a two-step pathway: ethylbenzene is first dehydrogenated to styrene with H2 formed simultaneously, and then CO2 reacts with H2 via the reverse water gas shift. The produced styrene can easily undergo polymerization to form polystyrene, which is a key intermediate for coke formation. Furthermore, in the absence of CO2, the produced polystyrene transforms into graphite-like coke at temperatures above 500°C, which leads to catalyst deactivation. In the presence of CO2, the coke deposition can be effectively removed via oxidation with CO2.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725; AC02-07CH11358
OSTI ID:
1222559
Alternate ID(s):
OSTI ID: 1234459; OSTI ID: 1287018
Report Number(s):
IS-J-8866; ED2801000; CEED500
Journal Information:
ACS Catalysis, Vol. 5, Issue 10; ISSN 2155-5435
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 73 works
Citation information provided by
Web of Science

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Mesoporous xEr 2 O 3 ·CoTiO 3 composite oxide catalysts for low temperature dehydrogenation of ethylbenzene to styrene using CO 2 as a soft oxidant journal January 2016
Dehydrogenation of 5-hydroxymethylfurfural to diformylfuran in compressed carbon dioxide: an oxidant free approach journal January 2017
CNT‐Catalyzed Oxidative Dehydrogenation of Ethylbenzene to Styrene: DFT Calculations Disclose the Pathways journal January 2019
Unique influence of rare earth (Pr, Nd, and Er) oxide surface acidic texture over CeO2/γ-Al2O3 catalysts for selective production of styrene using CO2 flow journal February 2019
Integrated conversion of 1-butanol to 1,3-butadiene journal January 2018
Tungsten Carbide: A Remarkably Efficient Catalyst for the Selective Cleavage of Lignin C−O Bonds journal October 2016
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
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Oxidation of ethylbenzene to styrene oxide in the presence of cellulose-supported Pd magnetic nanoparticles: Oxidation of ethylbenzene to styrene oxide journal April 2016
Oxidative dehydrogenation of ethylbenzene to styrene with CO 2 over Al‐MCM‐41‐supported vanadia catalysts journal December 2019
CO 2 -assisted synthesis of non-symmetric α-diketones directly from aldehydes via C–C bond formation journal January 2017
Electric Field-Driven Assembly of Sulfonated Polystyrene Microspheres journal March 2017