Partial oxidation studies were conducted over a series of Ni-substituted lanthanum hexaaluminate catalysts, La_0.9Ni_yAl_11.95-yO_19-δ (y = 1.0, 0.8, 0.4 and 0.2) to evaluate the effect of higher alkane, sulfur and polycyclic aromatic hydrocarbons using tetradecane (n-C₁₄), dibenzothiophene (DBT) and 1-methylnapthalene (1-MN) as model reaction compounds. XRD showed the Ni-substituted lanthanum hexaaluminate catalysts to have magnetoplumbite structure. Lattice parameters along the a,b-axis are shown to increase systematically with increasing Ni substitution. The unit cell is also shown to increase systematically with Ni substitution providing clear evidence of Ni²⁺ substitution for Al³⁺ in the lanthanum hexaaluminate lattice. Catalytic activity and product yields were evaluated by temperature programmed surface reaction (TPSR) using n-C₁₄ partial oxidation as a probe reaction. Between 750 and 900 °C, H₂ and CO yields are shown to increase with increasing Ni surface sites while aromatic and olefin yields are shown to decrease. Step response experiments were performed to show the effect of 0.1 wt% 1-MN addition on catalytic activity and performance. As expected, at lower Ni substitution, thermal chemistry predominates suggesting fewer available active Ni sites. At the conditions tested, the site blocking effect is shown to be reversible at all levels of Ni substitution. Similar catalytic behaviors are observed with step response experiments to 50 ppm w/w dibenzothiophene (DBT) where site blocking is shown to produce a concomitantly greater effect on catalytic performance and active site occlusion with catalysts that have less active sites. The step response to DBT is also observed to be reversible. Post analysis of the used catalysts shows that coke deposition is greater on the catalysts with lower Ni substitution.

部分氧化研究，在一系列的Ni取代镧六铝酸盐催化剂进行的La _0.9镍_ý铝_11.95-Y ö _19-δ（Y = 1.0，0.8，0.4和0.2），以评估十九烷，硫和多环的效果芳烃，使用十四烷（nC ₁₄），二苯并噻吩（DBT）和1-甲基萘（1-MN）作为模型反应化合物。XRD显示Ni-取代的六铝酸镧催化剂具有磁铅石结构。沿a，b轴的晶格参数显示出随着Ni取代的增加而系统地增加。还显示了晶胞随着镍的取代而系统地增加，提供了镍^2+的明确证据。六铝^酸镧晶格中Al ^3+的取代。使用nC ₁₄部分氧化作为探针反应，通过程序升温表面反应（TPSR）评估了催化活性和产物收率。750至900°C之间，H ₂Ni的收率和CO收率均随着Ni表面位置的增加而增加，而芳烃和烯烃的收率则有所下降。进行了阶跃响应实验，以显示添加0.1 wt％的1-MN对催化活性和性能的影响。不出所料，在较低的Ni取代度下，热化学占主导地位，这表明可用的活性Ni部位较少。在所测试的条件下，在所有水平的Ni取代下，位点阻断效果均显示为可逆的。在对50 ppm w / w二苯并噻吩（DBT）的阶跃响应实验中观察到了相似的催化行为，其中位点封闭显示出对催化性能和活性位点较少的催化剂的活性位点闭塞产生更大的影响。还观察到对DBT的阶跃响应是可逆的。