甲烷联合重整包覆型镍基催化剂抗积碳性能研究
Study on the anti-coking performance of coated Ni-based catalysts for methane combined reforming
采用等体积浸渍法制备镁铝尖晶石负载镍基催化剂,经(3-氨基丙基)三乙氧基硅烷(APTES)包覆SiO2层,并在包覆层引入La。利用X射线衍射(XRD)、N2物理吸附、H2程序升温还原(H2-TPR)、透射电子显微镜(TEM)和热重分析(TG)等表征。结果表明,包覆层可有效抑制高温积碳。在750℃、V(CH4)∶V(CO2)∶V(H2O)=1∶0.25∶0.89时进行50 h抗积碳性能测试,La改性的催化剂积碳量由44.72%降低至0.24%;100 h寿命测试后积碳量仅为0.48%,展现出优异的抗积碳性能与工业应用价值。
Ni-based catalysts supported on magnesium aluminate spinel were prepared via a stepwise incipient wetness impregnation method.Different mass fractions of SiO2 layers were coated onto the catalysts through the hydrolysis of (3-aminopropyl) triethoxysilane (APTES),followed by the introduction of La into the coating.The effects of the SiO2 coating and La addition on the structural properties and anti-coking behavior of the catalysts were systematically investigated.The catalysts were characterized using X-ray diffraction (XRD),N2 physisorption,H2 temperature-programmed reduction (H2-TPR),transmission electron microscopy (TEM),and thermogravimetric analysis (TG).The results indicate that the SiO2 coating effectively inhibits carbon deposition on the catalyst surface during high-temperature reactions.Under harsh conditions at 750℃ with a feed gas ratio of CH4∶CO2∶H2O=1∶0.25∶0.89,the SiO2-coated catalyst modified with a La promoter demonstrated excellent stability during a 50 h test.Compared to the uncoated catalyst,the amount of carbon deposition was significantly reduced from 44.72% to 0.24%.In a subsequent extended durability test of 100 h,the catalyst maintained a low carbon accumulation of only 0.48%,highlighting its outstanding anti-coking performance and potential for industrial application.
甲烷联合重整 / Ni基催化剂 / SiO2包覆层 / La / 抗积碳
combined methane reforming / Ni-based catalyst / SiO2 coating / lanthanum / anti-coking
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