%0 Journal Article
%@ 03603199
%A Witoon, T.
%A Numpilai, T.
%A Dolsiririttigul, N.
%A Chanlek, N.
%A Poo-arporn, Y.
%A Cheng, C.K.
%A Ayodele, B.V.
%A Chareonpanich, M.
%A Limtrakul, J.
%D 2022
%F scholars:16062
%I Elsevier Ltd
%J International Journal of Hydrogen Energy
%K Ammonia; Carbon dioxide; Catalyst activity; Copper oxides; Greenhouse gases; Hydrogenation; II-VI semiconductors; Zinc oxide; Zirconia, CO2 hydrogenation; CO2 utilization; Cu-modified sulphated zirconium; Dimethyl ether; Direct synthesis; Greenhouses gas; Sulfated Zirconia; Synthesis of dimethyl ethers; Time on streams; ]+ catalyst, Ethers
%N 98
%P 41374-41385
%R 10.1016/j.ijhydene.2022.03.150
%T Enhanced activity and stability of SO42�/ZrO2 by addition of Cu combined with CuZnOZrO2 for direct synthesis of dimethyl ether from CO2 hydrogenation
%U https://khub.utp.edu.my/scholars/16062/
%V 47
%X Cu-modified SO42�/ZrO2 catalysts (XCu-SZ) with different Cu loading contents were prepared by sulfation of ZrOCl2·8H2O with (NH4)2SO4 to form SO42�/ZrO2 (SZ) followed by impregnation of SZ with a Cu precursor. The resulting XCu-SZ catalysts combined with a CuO�ZnO�ZrO2 catalyst were tested for CO2 hydrogenation to dimethyl ether (DME). The results indicated that the unmodified SZ catalyst exhibited the maximum DME yield (3.7) which was 2.0�2.6 times higher than the DME yield of all XCu-SZ catalysts at the beginning of reaction. However, the DME yield over the unmodified SZ catalyst rapidly decreased, while that of all XCu-SZ catalysts gradually increased during the time-on-stream experiment. After 100 h, the 6 wt Cu-modified SZ catalyst achieved the maximum DME yield of 3.2 at 260 °C and 20 bar, while the DME yield of the unmodified SZ catalyst was only 2.5. The NH3-TPD and XPS analyses indicated that more strong acid sites were present on the unmodified SZ catalyst, resulting in a coke formation and thus the rapid deactivation. For the XCu-SZ catalysts, Cu0 was formed on the surface of SZ after the reduction with H2 which accounted for the active site of hydrogenolysis of methanol to methane. During the time-on-stream experiment, Cu0 was progressively transformed to Cu2S through poisoning, leading to the continued increase of DME yield. © 2022 Hydrogen Energy Publications LLC
%Z cited By 8