Modification of CeNi0.9Zr0.1O3 Perovskite Catalyst by Partially Substituting Yttrium with Zirconia in Dry Reforming of Methane

Abstract

Methane Dry Reforming is one of the means of producing syngas. CeNi0.9Zr0.1O3 catalyst and its modification with yttrium were investigated for CO2 reforming of methane. The experiment was performed at 800 °C to examine the effect of yttrium loading on catalyst activity, stability, and H2/CO ratio. The catalyst activity increased with an increase in yttrium loading with CeNi0.9Zr0.01Y0.09O3 catalyst demonstrating the best activity with CH4 conversion >85% and CO2 conversion >90% while the stability increased with increases in zirconium loading. The specific surface area of samples ranged from 1–9 m2/g with a pore size of 12–29 nm. The samples all showed type IV isotherms. The XRD peaks confirmed the formation of a monoclinic phase of zirconium and the well-crystallized structure of the perovskite catalyst. The Temperature Program Reduction analysis (TPR) showed a peak at low-temperature region for the yttrium doped catalyst while the un-modified perovskite catalyst (CeNi0.9Zr0.1O3) showed a slight shift to a moderate temperature region in the TPR profile. The Thermogravimetric analysis (TGA) curve showed a weight loss step in the range of 500–700 °C, with CeNi0.9Zr0.1O3 having the least carbon with a weight loss of 20%.

The influence of Ni stability, redox, and lattice oxygen capacity on catalytic hydrogen production via methane dry reforming in innovative metal oxide systems

“…57,58 0.07, and 0.09); weight loss increases. The same trend is observed in CeNi 0.9 Zr 0.1−x Y x O 3 (x = 0.00, 0.05, 0.07, and 0.09) catalyst system by Lanre et al 49 The transmission electron microscope image of La 0.6 Ce 0.4 Ni 0.9 Zr 0.01 Y 0.09 O 3 catalyst (fresh and spent) and corresponding average Ni particle size distribution are shown in Figure 5B,C(b,c). Significant filamentous coke formation is observed over the spent La 0.6 Ce 0.4 Ni 0.9 Zr 0.01 Y 0.09 O 3 catalyst.…”

“…In the CeNi 0.9 Zr 0.1−x (x = 0, 0.03, 0.05, and 0.07) catalyst system, Lanre et al demonstrated the absence of perovskite phase, presence of individual metal oxide phases, and the presence of mixed yttrium cerium oxide. 49 Dezvareh et al showed that on substitution La by 0.1% Ce at the A site and Ni by 0.2% Zr at the B site, metal support interaction increased, resulting in increased activity. 40 The synergic effect of two metal oxides (ceria-lanthana) on redox and basicity function was previously utilized in the catalytic combustion of methane 50 and oxidation of CO. 51 Overall, "CH 4 decomposition over Ni," "strong interaction of CO 2 with lanthanum," "redox cycle and CO 2 activation with ceria," and "instant lattice oxygen availability by Zr and Y" are some catalyst merits in favor of DRM.…”

“…Santamaria et al 41 demonstrated that ZrO 2 is an appropriate support for Ni because it limits coke formation with low carbon combustion temperatures. In the CeNi 0.9 Zr 0.1 − x ( x = 0, 0.03, 0.05, and 0.07) catalyst system, Lanre et al demonstrated the absence of perovskite phase, presence of individual metal oxide phases, and the presence of mixed yttrium cerium oxide 49 . Dezvareh et al showed that on substitution La by 0.1% Ce at the A site and Ni by 0.2% Zr at the B site, metal support interaction increased, resulting in increased activity 40 .…”

Lanthanum–Cerium-Modified Nickel Catalysts for Dry Reforming of Methane

“…The CsNi 0.9 Zr 0.1 O 3 catalyst displayed CH 4 conversion >70%, CO 2 conversion >80%, and H 2 /CO >0.90, while the LaNi 0.9 Zr 0.1 O 3 catalyst displayed CH 4 conversion >65%, CO 2 conversion >75%, and H 2 /CO >0.90 for the DRM reaction performed at 1073 K for 7 hours' time on stream. CeO 2 modifies the catalytic features of nickel-based catalysts in DRM based on its redox features and enables it to support CO 2 activation (Ce 2 O 3 + CO 2 → 2CeO 2 + CO) [42,43]. The value of the H 2 /CO ratio theoretically equals one but side reactions in the DRM experiment influence its actual value.…”

Syngas production from the CO2 reforming of a waste cooking oil model compound over catalysts derived from La1−xSrxNiO3 perovskites

“…21 Alkaline earth metals are known to function as catalytic promoters that improve the stability of the catalyst by suppressing carbon deposition. 22 Specifically, the doping of alkaline earth metals improves the reducibility of perovskite-type perovskites and generates more active sites, thus improving the catalyst activity. Additionally, the surface oxygen species generated by the doping of alkaline earth metals significantly improve the ability of La 2 O 3 to both adsorb and desorb oxygen.…”