Reforming of Ethanol with Carbon Dioxide Catalysed by Gold-promoted Copper-ceria-zirconia Composites

Abstract

In ethanol CO2 reforming, the addition of Au to 10Cu45Ce45Zr catalyst increased the conversion of ethanol and the yields of H2 and CO which were maximized for 2Au8Cu45Ce45Zr catalyst. TG-DTA measurement of used catalysts suggested that Cu metal species on the active catalysts would be difficult to oxidize, promote the transfer of oxygen to carbonaceous species forming CO and lead to the decrease in coke formation with addition of Au.

Reforming of ethanol with carbon dioxide catalysed by silver-promoted copper–ceria–zirconia composites

“…In our previous study, Au-promoted Cu catalysts exhibited a similar TG prole where Cu species on catalysts with Au was difficult to be oxidized. 1 TEM measurement was performed for fresh and used 2Ag8Cu67.5Ce22.5Zr catalysts (Fig. 5).…”

“…49,50 In a recent study, the CeO 2 -ZrO 2 composite prepared by the sol-gel method was used as a support of Cu metal species in DRE. 1 It was found that CuCeO 2 -ZrO 2 , which was prepared using a zirconium alkoxide, a lump of CeO 2 and copper nitrate, exhibited selective formation of CO and H 2 and showed that the formation of hydrocarbon fragments of C1, C2 and C4 could effectively be inhibited. Furthermore, the addition of Au remarkably enhanced the conversion of ethanol and the yields of CO and H 2 .…”

“…Dry reforming using greenhouse gas CO 2 to produce hydrogen and synthesis gas could be an ideal process if carbon neutral biomass was combined. 1–26 Although dry reforming of methane, one of the fossil fuels, has already been developed extensively, 27–37 the continuous utilization of fossil fuels might increase CO 2 even if methane fermentation could be utilized. Instead of the use of methane, dry reforming of ethanol (DRE) 1–26 would be one of the promising attempts to achieve a complete carbon neutral system.…”

“…1–26 Although dry reforming of methane, one of the fossil fuels, has already been developed extensively, 27–37 the continuous utilization of fossil fuels might increase CO 2 even if methane fermentation could be utilized. Instead of the use of methane, dry reforming of ethanol (DRE) 1–26 would be one of the promising attempts to achieve a complete carbon neutral system. 1 Ethanol is a common product, not toxic, safely preserved, transferred, treated and further could be a very attractive hydrogen source.…”

“…Instead of the use of methane, dry reforming of ethanol (DRE) 1–26 would be one of the promising attempts to achieve a complete carbon neutral system. 1 Ethanol is a common product, not toxic, safely preserved, transferred, treated and further could be a very attractive hydrogen source. However, DRE has not been studied as much as steam reforming 38–51 probably because the former needs relatively higher temperature and selectivity for H 2 and CO does not increase due to the ease of decomposition of ethanol into hydrocarbon fragments at higher temperature.…”