Effects of cerium incorporation into zirconia on the activity of Cu/ZrO for methanol synthesis via CO hydrogenation

Abstract

The effects of Ce incorporation into ZrO 2 on the catalytic performance of

Catalytic Methanation of Carbon Dioxide by Active Oxygen Material CexZr1−xO2 Supported NiCo Bimetallic Nanocatalysts

“…39 Oxygen vacancies and defects can activate and cause CO 2 (ad) and H 2 molecules to dissociate more easily. 40 Zr 41 cations replace Ce 41 cations in the CeO 2 lattice in the catalyst to make the Ce 41 cations easily reduced into Ce 31 . The presence of more Ce 31 increases the adsorption capacity of the catalyst for H atoms produced by dissociative adsorption of H 2 on the dispersed active metals and spillover onto the mixed oxide support surface, resulting in higher catalytic activities.…”

“…In addition, this catalyst did not strongly interact with support. The peaks observed at approximately 300-550 C can be attributed to NiO reduction, which highly interacted with support and substituted Zr 41 or Ce 41 . The low temperature reduction peak of 15NiA5Co/CeO 2 was remarkably higher than that of 15NiA5Co/ZO 2 , but its high-temperature peak was much lower than that of 15NiA5Co/ZO 2 .…”

“…The addition of ZrO 2 also increased the CO chemisorption of a catalyst, thereby improving the dispersion of active metals. The OSC of the catalyst is only slightly increased after the Co addition because less Co cations than Zr 41 can be inserted into the crystalline structure of CeO 2 to improve the OSC of the catalyst. However, the addition of Co addition can improved the CO chemisorption of the catalyst and hence increased the active metal dispersion.…”

Promoting Effect of Admixed CexZr1-xO2with Cu-ZnO-Al2O3Methanol Synthesis Catalyst on Catalytic Performance: Influence of Ce/Zr Ratio

“…The small particle size on CZA(0.08) of 11.3 nm for CuO and 6.8 nm for metallic copper is observed. The different surface acidity (Bronsted acidic site) on CexZr1-xO2 has been previously reported 13 and it can be enhanced on CexZr1-xO2 in the range of 0.3 to 0.5 due to the facile reduction of Ce 4+ to Ce…”

Microwave, Ultrasound, and Mechanochemistry: Unconventional Tools that Are Used to Obtain “Smart” Catalysts for CO2 Hydrogenation

“…Many unconventional preparation routes have been adopted to obtain Cu-ZnO catalysts with improved activity, selectivity, resistance to poisons, and enhanced lifetime [38,[74][75][76][77][78]. In this frame, the SG method was largely adopted in order to increase the metal surface area along with the total surface area [79,80].…”