Preparation of silicon carbide supported nickel catalyst with enhanced catalytic activity for ammonia decomposition

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-05-24 DOI:10.1007/s42823-024-00747-9

Xiantong Yu, Gideon Kofie, Fengxiang Yin, Jie Zhang, Qinjun Deng, Guoru Li, Yuhang Tan, Gongheng Zhang, Biaohua Chen

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Abstract

Silicon carbide (β-SiC) was synthesized through an improved sol–gel method, then Ni/SiC catalysts were prepared using a hydrothermal method. The catalysts were characterized using TEM, H₂-TPR, CO₂-TPD and N₂-TPD, etc. The results showed that the synthesized β-SiC had a large specific surface area, promoting the dispersion of Ni species and thus exposing more active sites. The interaction between Ni species and β-SiC contributed significantly to catalytic performance. Furthermore, the strong alkalinity of catalyst could adjust the bond energy of the active metal and N (M–N), which were conducive to desorption of the recombinant N₂ from the metal surface, promoting to ammonia decomposition. Among the Ni/SiC catalysts, 30Ni/SiC-700 synthesized with the Ni loading of 30 wt% and calcination temperature of 700 °C, exhibited the optimal ammonia conversion rate of 93.4% at 600 °C under the space speed of 30,000 mL∙g_cat⁻¹∙h⁻¹, and demonstrated a long-term stability, suggesting a very promising catalyst in ammonia decomposition.

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制备碳化硅支撑的镍催化剂，提高氨分解催化活性

通过改进的溶胶-凝胶法合成了碳化硅（β-SiC），然后采用水热法制备了 Ni/SiC 催化剂。采用 TEM、H2-TPR、CO2-TPD 和 N2-TPD 等方法对催化剂进行了表征。结果表明，合成的 β-SiC 具有较大的比表面积，促进了 Ni 物种的分散，从而暴露出更多的活性位点。镍物种与 β-SiC 之间的相互作用对催化性能有显著的促进作用。此外，催化剂的强碱性可调节活性金属与 N（M-N）的键能，有利于重组 N2 从金属表面解吸，促进氨分解。在 Ni/SiC 催化剂中，镍负载量为 30 wt%、煅烧温度为 700 °C、合成的 30Ni/SiC-700 在 600 °C、空间速度为 30,000 mL∙gcat-1∙h-1 条件下的最佳氨转化率为 93.4%，并表现出长期稳定性，表明这是一种非常有前景的氨分解催化剂。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.