Luo Yuhao, Su Tongming, Chen Liuyun, Ji Hongbing, Qin Zuzeng
School of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue Road, Nanning, 530004, P. R. China.
Institute of Green Petroleum Processing and Light Hydrocarbon Conversion, College of Chemical Engineering, Zhejiang University of Technology, 288 Liuhe Road, Hangzhou, 310023, P. R. China.
Chem Asian J. 2024 Oct 16;19(20):e202400700. doi: 10.1002/asia.202400700. Epub 2024 Sep 12.
Two-component catalysts have garnered significant attention in the field of catalysis due to their ability to inhibit Ni sintering. In the present work, honeycomb-structuralstructured AlO-supported Ni and B were prepared to enhance coke tolerance during dry reforming of methane (DRM). Transmission electron microscopy (TEM) results revealed that the average particle sizes on Ni/AlO and Ni-0.16B/AlO were 7.6 nm and 4.2 nm, respectively, indicating that B can effectively inhibit Ni sintering. After a 100-hour reaction, the conversion of CH and CO on Ni/AlO decreased by approximately 5 %, whereas on Ni-0.16B/AlO, there was no significant decrease in CH and CO conversion, with values of approximately 81.6 % and 87.2 %, respectively. In situ DRIFT spectra demonstrated that Ni-0.16B/AlO enhanced the activation of CO, thus improving the catalyst's stability. A Langmuir-Hinshelwood-Hougen-Watson (LHHW) model was developed for intrinsic kinetics, and the resulting kinetic expressions were well-fitted fit to the experimental data, with R values exceeding 0.9. ActivationThe activation energies were also calculated. The outstanding stability of Ni-0.16B/AlO can be attributed to its stable honeycomb structure and B's ability to significantly inhibit Ni sintering, reduce catalyst particle size, and enhance coke tolerance.
双组分催化剂因其抑制镍烧结的能力而在催化领域备受关注。在本工作中，制备了蜂窝结构的氧化铝负载镍和硼，以提高甲烷干重整（DRM）过程中的抗积炭性能。透射电子显微镜（TEM）结果显示，Ni/Al₂O₃和Ni-0.16B/Al₂O₃上的平均粒径分别为7.6 nm和4.2 nm，表明硼能有效抑制镍烧结。经过100小时的反应，Ni/Al₂O₃上CH₄和CO的转化率下降了约5%，而在Ni-0.16B/Al₂O₃上，CH₄和CO的转化率没有显著下降，分别约为81.6%和87.2%。原位漫反射红外傅里叶变换光谱（DRIFT）表明，Ni-0.16B/Al₂O₃增强了CO的活化，从而提高了催化剂的稳定性。建立了用于本征动力学的朗缪尔-欣谢尔伍德-霍根-华生（LHHW）模型，所得动力学表达式与实验数据拟合良好，R值超过0.9。还计算了活化能。Ni-0.16B/Al₂O₃出色的稳定性可归因于其稳定的蜂窝结构以及硼显著抑制镍烧结、减小催化剂粒径和提高抗积炭性能的能力。
