催化学报 ›› 2026, Vol. 87: 363-375.DOI: 10.1016/S1872-2067(26)65063-2

• 论文 • 上一篇    下一篇

CeAlO3镶嵌镍纳米颗粒抗积碳甲烷干重整催化剂

马忠臣a, 尹美怡a, 徐润b, 张荣俊b, 兰天a, 顾文丽a, 陈国庆a, 路勇a,c,*()   

  1. a 华东师范大学化学与分子工程学院, 石油化工分子转化与反应工程全国重点实验室, 上海市绿色化学与化工过程绿色化重点实验室, 上海 200062
    b 中石化石油化工科学研究院有限公司, 北京 100083
    c 崇明生态研究院, 上海 202151
  • 收稿日期:2025-11-19 接受日期:2025-12-22 出版日期:2026-08-18 发布日期:2026-06-24
  • 通讯作者: *电子信箱: ylu@chem.ecnu.edu.cn (路勇).
  • 基金资助:
    国家自然科学基金(22572054);国家自然科学基金(22272053);国家自然科学基金(22072043);国家重点研发计划(2023YFA1507903);国家重点研发计划(2023YFB3810602);中石化石油化工科学研究院有限公司部分经费资助

Coking-resistant CeAlO3-Socketed Nickel Nanocatalysts for dry reforming of methane

Zhongchen Maa, Meiyi Yina, Run Xub, Rongjun Zhangb, Tian Lana, Wenli Gua, Guoqing Chena, Yong Lua,c,*()   

  1. a State Key Laboratory of Petroleum Molecular & Process Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
    b SINOPEC Research Institute of Petroleum Processing Co., Ltd., Beijing 100083, China
    c Institute of Eco-Chongming (IEC), Shanghai 202151, China
  • Received:2025-11-19 Accepted:2025-12-22 Online:2026-08-18 Published:2026-06-24
  • Supported by:
    National Natural Science Foundation of China(22572054);National Natural Science Foundation of China(22272053);National Natural Science Foundation of China(22072043);National Key Research and Development Program of China(2023YFA1507903);National Key Research and Development Program of China(2023YFB3810602);support partially provided by the SINOPEC Research Institute of Petroleum Processing Co., Ltd.

摘要:

推进碳基能源化工体系的绿色可持续发展, 是当前国家“双碳”战略实施的必然要求. 从绿色碳科学分子视角看, CH4和CO2能源化工利用的开发和应用, 是一项赋能“碳减排”、服务“碳中和”的重要路径. 将CO2与CH4通过重整反应(DRM, 甲烷干重整)制成合成气并经下游催化技术转化可同时实现天然气(主要成分为CH4)和CO2的化工利用, 是规模化消纳CO2、助力“碳减排”的极具工业化潜力的关键技术. 作为最具工业应用潜力的镍基催化剂, 其抗积碳、抗烧结性能依然面临严峻挑战, 这极大制约了DRM过程的商业化开发.

基于此, 本研究提出了一种限域结构耦合界面氧化-还原工程的催化剂构筑策略, 旨在为Ni基催化剂的易积碳和易烧结问题提供解决方案. 具体而言, 通过H2还原诱导Ni颗粒从Ce1Al0.95Ni0.05Ox复合氧化物中析出, 并同步结晶生成CeAlO3, 可控构建出CeAlO3镶嵌Ni纳米颗粒的限域耦合特定界面的独特结构. 尤其是, 通过改变还原温度(700‒900 °C)实现了系列Ni颗粒析出程度可控且Ni-CeAlO3界面量可调的Ce1Al0.95Ni0.05Ox-T催化剂的制备. 对所制得催化剂进行了扫描电镜、透射电镜、分散度、催化活性、失活率及转换频率等分析表征, 结合理论计算, 深入研究了还原温度对界面结构以及催化活性和稳定性的影响. 结果表明, 经750 °C还原制得的催化剂, Ni纳米颗粒(3-4 nm)均匀嵌入到CeAlO3载体中, 形成了丰富的Ni-CeAlO3界面结构. 所得Ce1Al0.95Ni0.05Ox-750催化剂在常压、700 °C, 15 L gcat−1 h−1, CH4/CO2 = 1/1(无稀释)的反应条件下, 连续运行500 h无失活且无积碳生成. 研究表明, Ni-CeAlO3界面活性位相对于Ni颗粒表面位点, 对甲烷的活化能力有所削弱但同时对CO2的活化能力得到了明显增强. 在此基础上, 借助原位红外漫反射光谱和13C同位素标记实验研究, 揭示了Ni-CeAlO3界面氧化-还原催化循环机理: 在反应气氛中CO2优先在Ni-CeAlO3界面位点上活化, 生成CO与活性氧物种(O*); 随后, 界面的O*以CH3O*中间体的形式参与CH4的活化并进一步转化生成CO和H2, 完成界面氧化-还原催化循环. 这种串行反应机制实现了CO2和CH4分子的计量转化, 从本质上抑制了传统甲烷裂解机理上由于O*供给以及传递速率不足引起的积碳, 赋予催化剂突出的抗积碳性能.

综上, 本文针对Ni基DRM催化剂易积碳和易烧结的问题, 发展了限域结构耦合界面氧化-还原工程的催化剂构筑策略, 研制出兼具抗积碳和抗烧结性能的Ni基催化剂, 阐明了基于CO2优先活化提供活性氧物种(O*)接力活化转化CH4的串行反应新机理. 本研究为设计具有工业应用前景的高效镍基DRM催化剂提供了新思路和可行技术方案.

关键词: 甲烷干重整, 抗积碳, 镍基催化剂, 界面催化, CeAlO3

Abstract:

Nickel-based catalysts are regarded as the most promising candidates for industrial dry reforming of methane (DRM), yet severe coking and metal sintering impede their commercial viability. Herein, we report a CeAlO3-socketed Ni nanocatalyst with extensive Ni-CeAlO3 interfaces, demonstrating coke-free stability with no deactivation over 500 h test at 700 °C for a feed of CH4/CO2 = 1/1 (undiluted). The socket-structured catalyst was obtained via H2-reduction-triggered Ni exsolution and simultaneous formation of CeAlO3 from a Ce1Al0.95Ni0.05Ox composite oxide. A socketed structure featuring extensive Ni-CeAlO3 interface was achieved upon reduction at 750 °C, which essentially modulated the catalytic activation kinetics of both CO2 and CH4. In-situ diffused reflectance infrared Fourier transformed spectroscopy and isotope-labeling experiments were performed to gain insight into the interfacial catalysis, revealing that CO2 was preferentially activated at the Ni-CeAlO3 interface to form CO and O*, and CH4 was subsequently oxidized by O* to form H2 and another CO through formation of CH3O* intermediates. Such tandem reaction pathway led to stoichiometric conversion of CO2 and CH4 molecules thereby imparting our catalyst to high coking resistance. Our findings shed light on the rational design of a valid Ni-based DRM catalyst with substantial potential for industrial application.

Key words: Dry reforming of methane, Coking resistance, Nickel catalyst, Interface catalysis, CeAlO3