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Engineering a Nickel–Oxygen Vacancy Interface for Enhanced Dry Reforming of Methane: A Promoted Effect of CeO2 Introduction into Ni/MgO
ACS Catalysis ( IF 11.3 ) Pub Date : 2023-11-17 , DOI: 10.1021/acscatal.3c04150 Xi Ding 1, 2 , Yunfeng Yang 1, 2 , Zhaoyang Li 1, 2 , Peitao Huang 2 , Xiaohui Liu 1, 2 , Yong Guo 1, 2 , Yanqin Wang 1, 2
ACS Catalysis ( IF 11.3 ) Pub Date : 2023-11-17 , DOI: 10.1021/acscatal.3c04150 Xi Ding 1, 2 , Yunfeng Yang 1, 2 , Zhaoyang Li 1, 2 , Peitao Huang 2 , Xiaohui Liu 1, 2 , Yong Guo 1, 2 , Yanqin Wang 1, 2
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Nickel, the most commonly used active metal for the dry reforming of methane (DRM), often encounters the challenge of severe deactivation due to sintering and carbon deposition. In this study, we introduce cerium into Ni/MgO, a traditional catalyst for DRM, to improve its activity and stability, resulting in an enhanced Ni/MgCeOx catalyst. With the optimized doping amount of cerium (Ce/Mg = 0.12), the catalyst demonstrates a conversion rate 65% for CH4, 75% for CO2, and a H2/CO ratio of 0.76, while the Ni/MgO catalyst only achieves a conversion rate of 57% for CH4, 65% for CO2, and a H2/CO ratio of 0.68. Furthermore, the introduction of cerium significantly improves the stability of the catalyst. These improved activity and stability can be attributed to the easy reducibility of NiOx species, small Ni particle size, and abundant oxygen vacancies resulting from the doping of cerium. The affinity between CeO2 and NiOx inhibits the formation of the NiO-MgO solid solution, which contributes to the enhanced performance.
中文翻译：
设计镍-氧空位界面以增强甲烷干重整：CeO2 引入 Ni/MgO 的促进作用
镍是甲烷干重整（DRM）中最常用的活性金属，经常遇到由于烧结和碳沉积而严重失活的挑战。在这项研究中，我们将铈引入到传统DRM催化剂Ni/MgO中，以提高其活性和稳定性，从而得到增强的Ni/MgCeO x催化剂。在优化的铈掺杂量(Ce/Mg = 0.12)下，该催化剂的CH 4转化率为65% ，CO 2转化率为75% ，H 2 /CO比为0.76，而仅Ni/MgO催化剂CH 4的转化率为57% ，CO 2的转化率为65% ，H 2 /CO比为0.68。此外，铈的引入显着提高了催化剂的稳定性。这些改进的活性和稳定性可归因于NiO x物种的易还原性、小的Ni颗粒尺寸以及由于铈的掺杂而产生的丰富的氧空位。CeO 2和NiO x之间的亲和力抑制了NiO-MgO固溶体的形成，这有助于提高性能。
更新日期：2023-11-17
中文翻译：
设计镍-氧空位界面以增强甲烷干重整：CeO2 引入 Ni/MgO 的促进作用
镍是甲烷干重整（DRM）中最常用的活性金属，经常遇到由于烧结和碳沉积而严重失活的挑战。在这项研究中，我们将铈引入到传统DRM催化剂Ni/MgO中，以提高其活性和稳定性，从而得到增强的Ni/MgCeO x催化剂。在优化的铈掺杂量(Ce/Mg = 0.12)下，该催化剂的CH 4转化率为65% ，CO 2转化率为75% ，H 2 /CO比为0.76，而仅Ni/MgO催化剂CH 4的转化率为57% ，CO 2的转化率为65% ，H 2 /CO比为0.68。此外，铈的引入显着提高了催化剂的稳定性。这些改进的活性和稳定性可归因于NiO x物种的易还原性、小的Ni颗粒尺寸以及由于铈的掺杂而产生的丰富的氧空位。CeO 2和NiO x之间的亲和力抑制了NiO-MgO固溶体的形成，这有助于提高性能。
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