Effect of ZrO2 Crystalline Phase on the Performance of Ni-B/ZrO2 Catalyst for the CO Selective Methanation

Mesoporous zirconia-modified clays supported nickel catalysts for CO and CO 2 methanation

“…Nickel oxide in cubic phase is the only nickel species that can be detected by XRD, and the NiO nanoparticles buried in the stack layers of zirconia nanoparticles on the surfaces of the clay layers can be observed by TEM. It seems to be that zirconia plays a role for the dispersion of the NiO nanoparticles, which is in consistence with the observations of other researchers [10,18,20,24,44]. Nickel oxide is reduced to metallic nickel by H 2 before reaction.…”

“…Ni on zirconia was more active than on other supports [10,18,20,24,44], and some of them even believed that both zirconia and Ni played important roles during the methanation [22,58]. The proofs that zirconia promotes the dispersion of Ni species and prevents them from sintering are sufficient in this study, but no evidence indicates that zirconia involves the reaction.…”

“…However, nickel supported on silica or alumina often suffers from sintering and serious carbon deposition at high temperatures [32,43]. Some researchers have tried to dope zirconia in the catalyst to promote the dispersion of Ni species and prevent them from sintering [10,18,24,41,44], and achieved high activities and good stabilities. In our previous work [41], a nickel catalyst supported on a Al 2 O 3 @ZrO 2 core/shell structure has been prepared for CO methanation.…”

Dynamic analysis on methanation reactor using a double-input–multi-output linearized model

“…(1) In the COG methanation system, methanation of CO 2 may be restrained in the presence of CO [20,21], so methanation of CO mainly takes place in the first stage and continues in the middle stage, and methanation of CO 2 mainly occurs in the last stage. The CO 2 concentration is relatively low (about 2%) and the reaction heat of CO 2 methanation is less than that of CO methanation, so only the CO methanation in the first stage is considered.…”

Phase Composition of Ni/Mg1−xNixO as a Catalyst Prepared for Selective Methanation of CO in H2‐Rich Gas

“…This is in agreement with literatures [15][16][17] and attributed to preferential adsorption of CO on the metal surface. As CO concentration decreased to a low value, CO 2 could initially be adsorbed on the spare metal surface and hydrogenated [18][19][20]. Figure 7 shows XRD patterns of the catalysts 20%Ni/ Mg 1− Ni O-400-( = 500 ∘ C∼800 ∘ C) used in the CO-SMET reactions.…”