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Ni/La2O3 Catalysts for Dry Reforming of Methane: Insights into the Factors Improving the Catalytic Performance
ChemCatChem ( IF 3.8 ) Pub Date : 2019-05-20 , DOI: 10.1002/cctc.201900331
Luoji Xu 1 , Wenming Liu 1 , Xin Zhang 1 , Lele Tao 1 , Lianghui Xia 1 , Xianglan Xu 1 , Junwei Song 2 , Wufeng Zhou 3 , Xiuzhong Fang 1, 4 , Xiang Wang 1
ChemCatChem ( IF 3.8 ) Pub Date : 2019-05-20 , DOI: 10.1002/cctc.201900331
Luoji Xu 1 , Wenming Liu 1 , Xin Zhang 1 , Lele Tao 1 , Lianghui Xia 1 , Xianglan Xu 1 , Junwei Song 2 , Wufeng Zhou 3 , Xiuzhong Fang 1, 4 , Xiang Wang 1
Affiliation
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To understand the structure‐reactivity relationship of Ni/La2O3, and eventually get more applicable catalysts for DRM, glycine nitrate combustion (GNC), precipitation (PP) and thermal decomposition (TD) methods have been used to prepare La2O3 supports. Although all the supports possess a hexagonal La2O3 phase, their bulk and surface properties are significantly changed. By using them as supports, the interactions between NiO/Ni and La2O3 are varied, thus achieving Ni/La2O3 catalysts with different activity, stability and anti‐coking ability, which follow the order of 5Ni/La2O3‐GNC>5Ni/La2O3‐PP>5Ni/La2O3‐TD. On La2O3 having a higher surface area, a catalyst with a higher active metallic Ni surface area can be achieved. Therefore, the interfaces between Ni and La2O2CO3 can be enlarged, which effectively facilitates the reaction between carbon deposits and the La2O2CO3 formed during the DRM, thus preventing the accumulation of both and keeping the catalyst surface clean, active and stable. In addition, the amount of surface alkaline and active oxygen sites of the reduced catalysts obey the order of 5Ni/La2O3‐GNC>5Ni/La2O3‐PP>5Ni/La2O3‐TD, which is well consistent with the reaction performance. Therefore, these two factors are also believed to be critical to decide the reaction performance. It is concluded that Ni/La2O3 catalysts with high activity, stability and potent anti‐coking ability for DRM can be achieved by preparing catalysts with high Ni dispersion.
中文翻译：
用于甲烷干重整的Ni / La2O3催化剂：改善催化性能的因素的见解
为了了解Ni / La 2 O 3的结构反应关系，并最终获得更多适用于DRM的催化剂，已使用硝酸甘氨酸燃烧（GNC），沉淀（PP）和热分解（TD）方法制备La 2 O 3支持。尽管所有载体都具有六角形的La 2 O 3相，但是它们的体积和表面性质却发生了显着变化。通过将它们用作载体，改变了NiO / Ni和La 2 O 3之间的相互作用，从而获得了具有不同活性，稳定性和抗结焦能力的Ni / La 2 O 3催化剂，其遵循5Ni / La的顺序。2 O 3 ‐GNC> 5Ni / La 2 O 3 ‐PP> 5Ni / La 2 O 3 ‐TD。在具有较高表面积的La 2 O 3上，可以实现具有较高活性金属Ni表面积的催化剂。因此，可以扩大Ni和La 2 O 2 CO 3之间的界面，从而有效地促进碳沉积物与La 2 O 2 CO 3之间的反应。在DRM过程中会形成催化剂，从而防止两者的积累，并保持催化剂表面清洁，活性和稳定。此外，还原催化剂的表面碱性和活性氧位的数量服从5Ni / La 2 O 3 ‐GNC> 5Ni / La 2 O 3 ‐PP> 5Ni / La 2 O 3 ‐TD的顺序与反应性能一致。因此，这两个因素也被认为是决定反应性能的关键。结论是，通过制备具有高Ni分散性的催化剂，可以实现具有高活性，稳定性和对DRM的强抗焦化能力的Ni / La 2 O 3催化剂。
更新日期：2019-05-20
中文翻译：
用于甲烷干重整的Ni / La2O3催化剂：改善催化性能的因素的见解
为了了解Ni / La 2 O 3的结构反应关系，并最终获得更多适用于DRM的催化剂，已使用硝酸甘氨酸燃烧（GNC），沉淀（PP）和热分解（TD）方法制备La 2 O 3支持。尽管所有载体都具有六角形的La 2 O 3相，但是它们的体积和表面性质却发生了显着变化。通过将它们用作载体，改变了NiO / Ni和La 2 O 3之间的相互作用，从而获得了具有不同活性，稳定性和抗结焦能力的Ni / La 2 O 3催化剂，其遵循5Ni / La的顺序。2 O 3 ‐GNC> 5Ni / La 2 O 3 ‐PP> 5Ni / La 2 O 3 ‐TD。在具有较高表面积的La 2 O 3上，可以实现具有较高活性金属Ni表面积的催化剂。因此，可以扩大Ni和La 2 O 2 CO 3之间的界面，从而有效地促进碳沉积物与La 2 O 2 CO 3之间的反应。在DRM过程中会形成催化剂，从而防止两者的积累，并保持催化剂表面清洁，活性和稳定。此外，还原催化剂的表面碱性和活性氧位的数量服从5Ni / La 2 O 3 ‐GNC> 5Ni / La 2 O 3 ‐PP> 5Ni / La 2 O 3 ‐TD的顺序与反应性能一致。因此，这两个因素也被认为是决定反应性能的关键。结论是，通过制备具有高Ni分散性的催化剂，可以实现具有高活性，稳定性和对DRM的强抗焦化能力的Ni / La 2 O 3催化剂。
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