Oxidative dehydrogenation of ethylbenzene over γ-Al2O3 supported ceria-lanthanum oxide catalysts: Influence of Ce/La composition

Loại tài liệu:

Article

Tác giả:

Madduluri, Venkata Rao

Đề mục:

Arabian Journal of Chemistry

Nhà xuất bản:

Elsevier Ltd.

Ngày xuất bản:

January 2020

Định dạng:

pdf

Nguồn gốc:

Arabian Journal of Chemistry, Volume 13, Issue 1, January 2020, Pages 772-782

Ngôn ngữ:

eng

Lượt xem:

Lượt tải:

Nội dung

A series of CeO2/γ-Al2O3 (CA) catalysts with CeO2 loading of 5, 10, 15 and 20 wt% were prepared by a facile incipient wetness impregnation technique. Another series of La3+ doped catalysts (LCA) were prepared, wherein, 1, 3 and 5 wt% of La2O3 was doped in 15 wt%CeO2/γ-Al2O3, which were designated as 1LCA, 3LCA and 5LCA catalysts. Both CA and LCA catalysts were characterized by thermogravimetric analysis (TGA), BET surface area, X-ray diffraction (XRD), Infrared (FT-IR) spectroscopy, UV–vis diffuse reflectance spectra (UV–vis DRS), transmission electron microscopy (TEM), temperature programmed desorption of NH3 (TPD of NH3) temperature programmed reduction (TPR), CO2 pulse chemisorption and O2 pulse chemisorption techniques. All CA and LCA catalysts were evaluated for ethylbenzene (EB) oxidative dehydrogenation to styrene (ST) in vapor phase under atmospheric pressure with CO2 as an oxidant. Albeit CA and LCA catalysts are active, 15CA and 3LCA catalysts are found to be the best catalysts of the respective series. Apart from compatible acid-base and redox characteristics, sufficient amount of solid solution clusters (CexLa1-xO2-δ) are responsible for superior activity of 3LCA catalyst.

Tập tin đính kèm

Loại file Tên file Dung lượng Chi tiết
202001AJC772-782.pdf 2557105 Kb Xem Tải

Oxidative dehydrogenation of ethylbenzene over γ-Al2O3 supported ceria-lanthanum oxide catalysts: Influence of Ce/La composition

THƯ VIỆN ĐẠI HỌC KHOA HỌC HUẾ