DOI: 10.1016/j.jcou.2017.02.010
Scopus记录号: 2-s2.0-85013822923
论文题名: Development of stable MoO3/TiO2-Al2O3 catalyst for oxidative dehydrogenation of ethylbenzene to styrene using CO2 as soft oxidant
作者: Kainthla I. ; Babu G.V.R. ; Bhanushali J.T. ; Rao K.S.R. ; Nagaraja B.M.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 18 起始页码: 309
结束页码: 317
语种: 英语
英文关键词: CO2 oxidant
; Dehydrogenation
; Ethylbenzene
; MoO3
; Styrene
; TiO2-Al2O3
Scopus关键词: Aluminum
; Carbon dioxide
; Catalyst activity
; Catalysts
; Coke
; Dehydrogenation
; Ethylbenzene
; Molybdenum oxide
; Oxidants
; Polyacrylonitriles
; Pore size
; Scanning electron microscopy
; Styrene
; Temperature programmed desorption
; Thermogravimetric analysis
; Titanium dioxide
; X ray diffraction
; X ray photoelectron spectroscopy
; Dehydrogenation reactions
; Ethylbenzene conversion
; Gas hourly space velocities
; MoO<sub>3</sub>
; Oxidative dehydrogenations
; Surface acidic sites
; Temperature-programmed reduction
; Time on streams
; Catalyst selectivity
英文摘要: A novel MoO3/TiO2-Al2O3 (MTA) catalyst was employed for oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant with CO2/ethylbenzene (molar ratio) = 9.8 and gas hourly space velocity (GHSV) was maintained at 0.08 molh-1 g-1catalyst. Among different (2.5, 5.0, 7.5 and 10.0) wt.% loadings of MoO3, 7.5 wt.% loaded MoO3/TiO2-Al2O3 catalyst exhibited superior activity. The stability of the catalyst over time on stream was noteworthy where; the catalyst evinced notable activity up to 40 h with maximum ethylbenzene conversion of about 70% and styrene selectivity about 97%. The presence of titania greatly influenced the activity of the catalyst in terms of stability. The reaction with CO2 resulted in better activity compared to N2 proving it to be an effective oxidant for the dehydrogenation reactions. The deactivation of the catalyst was due to excess coke formation which led to blocking of active sites.The coke was removed by regenerating the catalyst at 600 anddeg;C under air. Interestingly, the catalysts were found active even after 40 h as well as in between 10 h of regenerations. The catalysts were characterized by X-Ray Diffraction, X-ray Photoelectron Spectroscopy, Surface area and Pore Size Distribution, Scanning Electron Microscopy, Thermogravimetric Analysis, H2-Temperature Programmed Reduction and Ammonia-Temperature Programmed Desorption. The results indicate that the surface area, interaction with the support, morphology of the catalyst and surface acidic sites exerted a significant influence on the activity. © 2017 Elsevier Ltd. All rights reserved. 资助项目: Instituto de Investigação Científica Tropical
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52761
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Kainthla I.,Babu G.V.R.,Bhanushali J.T.,et al. Development of stable MoO3/TiO2-Al2O3 catalyst for oxidative dehydrogenation of ethylbenzene to styrene using CO2 as soft oxidant[J]. Journal of CO2 Utilization,2017-01-01,18