Methanation of CO₂ was studied in a high throughput reactor (Amtech SPIDER 16) over Ni catalysts supported on ternary and quaternary alumina-zirconia-titania-ceria mixed oxides, in order to compare them under industrial relevant conditions and derive indications about the structure-activity relationships and specifically the role of ceria. The samples were characterized by BET, XRD, H₂-TPR, CO-chemisorption, XPS and CO-TPD analyses. Catalytic activity was evaluated towards CO₂ methanation at 5 bar pressure, temperature range of 300–400 °C and different Gas Hourly Space Velocities (GHSVs). The results showed that enhanced catalytic activity depends on both textural improvements (for the ternary oxide supported Ni) and reducibility and metal dispersion (for the quaternary oxide supported Ni). The comparison between both groups of catalysts revealed that addition of CeO₂ to 20%Ni/Al₂O₃-ZrO₂-TiO₂ further improves the catalytic performance. The catalyst supported on a mixed oxide support with 15 wt% of ceria, titania and zirconia (the remaining 55% is alumina) exhibits the highest CO₂ conversion (82%) and methane selectivity (98%) at 350 °C and GHSV of 4000 h⁻¹. The role of CeO₂ as promoter is to increase Ni dispersion and stabilize the presence of β-type NiO species which are reduced at lower temperatures. Other promoters (TiO₂, ZrO₂) have mainly a textural effect. Moreover, CeO₂ promotes also the stability decreasing the deactivation rate of about one order of magnitude with respect to the best ternary system (Ni/C5) investigated.

在高通量反应器（Amtech SPIDER 16）中研究了负载在三元和四元氧化铝-氧化锆-二氧化钛-二氧化铈混合氧化物上的Ni催化剂上的CO ₂甲烷化作用，以便在工业相关条件下对其进行比较并得出有关结构的说明-活动关系，尤其是二氧化铈的作用。通过BET，XRD，H ₂ -TPR，CO化学吸附，XPS和CO-TPD分析对样品进行表征。评价了对CO _2的催化活性在5 bar压力，300–400°C的温度范围和不同的气体时空速度（GHSV）下甲烷化。结果表明，增强的催化活性取决于结构改进（对于三元氧化物负载的Ni）和还原性和金属分散性（对于四元氧化物负载的Ni）。催化剂的两组之间的比较表明，添加的CeO ₂〜20％的Ni / Al的₂ ö ₃ -ZrO ₂ -TiO ₂进一步提高了催化性能。负载在具有15重量％的二氧化铈，二氧化钛和氧化锆（其余55％为氧化铝）的混合氧化物载体上的催化剂在350°C和GHSV下的最高CO ₂转化率（82％）和甲烷选择性（98％）。 4000小时^-1。CeO ₂作为促进剂的作用是增加Ni的分散性并稳定在较低温度下还原的β型NiO的存在。其他促进剂（TiO ₂，ZrO ₂）主要具有质感作用。而且，相对于所研究的最佳三元体系（Ni / C5），CeO ₂还提高了稳定性，使失活速率降低了约一个数量级。