The current study reports a regenerative approach for producing blue hydrogen (CO_x-free) and carbon nanotubes (CNTs) from natural gas (methane). The multi-metallic nickel-based copper and zinc promoted catalyst with an optimal composition (60%Ni-5%Cu-5%Zn/Al₂O₃) was synthesized in the laboratory and used for the pyrolysis of methane in a fluidized bed reactor under bubbling conditions. Fluidized bed reactor hydrodynamics and CNT extraction were well-thought-out while designing the catalyst. The separation of the CNTs and partial regeneration of the spent catalyst was performed using the ultrasonication technique. The regeneration ability of the catalyst was examined by performing multiple reaction-regeneration cycles. The regenerated catalyst regained its full activity, and >90% methane conversion was achieved with high-quality CNTs (o.d 60–80 nm, length 5 μm). State-of-the-art characterization tools like 3D-Raman mapping, high-resolution electron microscopy, EDX mapping were utilized to analyze CNTs. 3D-Raman map consists of 29,200 spectra ensured the uniformity and purity of grown CNTs.

当前的研究报告了一种利用天然气（甲烷）生产蓝色氢（无CO _x）和碳纳米管（CNT）的再生方法。最佳组成的多金属镍基铜锌助催化剂（60％Ni-5％Cu-5％Zn / Al ₂ O ₃）是在实验室合成的，用于在鼓泡条件下在流化床反应器中甲烷的热解。设计催化剂时，对流化床反应器的流体力学和CNT萃取进行了深思熟虑。使用超声技术进行CNT的分离和废催化剂的部分再生。通过进行多个反应-再生循环来检查催化剂的再生能力。再生的催化剂恢复了其全部活性，使用高质量的CNT（直径60-80 nm，长度5μm）可实现90％以上的甲烷转化率。利用最先进的表征工具（如3D拉曼映射，高分辨率电子显微镜，EDX映射）来分析CNT。3D拉曼图由29,200个光谱组成，确保了生长的CNT的均匀性和纯度。