摘要
采用溶液燃烧法制备了Ni含量为2wt%、4wt%、6wt%、8wt%和10wt%系列催化剂,并对反应前后催化剂进行N_2吸附–脱附、XRD、H_2-TPR、TPH、Raman、TEM和TG-DTG等表征。与等体积浸渍法（以溶液燃烧法制备的Al_2O_3为载体）制备的催化剂相比,溶液燃烧法制备的催化剂具有较大的比表面积,孔径分布可分为2~4.5 nm和4.5~10 nm两段,属典型的多级孔结构;NiO高度分散在载体上,与载体具有较强的相互作用,这种相互作用有利于提高催化剂的稳定性。催化剂210 h稳定性试验表明,溶液燃烧法制备的Ni含量为8wt%试样的CH_4转化率维持在90%左右,失活速率仅为0.035%/h,优于浸渍法制备的相同Ni含量催化剂。
Ni-Al_2O_3 catalysts with Ni loading of 2wt%, 4wt%, 6wt%, 8wt%, and 10wt% were prepared by solution combustion method for carbon dioxide reforming of methane to produce syngas, and characterized by N_2 adsorption-desorption method, XRD, H_2-TPR, TPH, Raman, TEM, and TG-DTG techniques. Results showed that all the catalysts preserved large specific surface areas and hierarchical pore size distributions（2–4.5 nm as one part and 4.5–10 nm as another part） as compared to 8IMNi-Al catalyst prepared by impregnation method（Al_2O_3 as support prepared by solution combustion method）. NiO was highly dispersed in the Ni-Al_2O_3 catalysts, which combined with support with strong metal-support interaction（SMSI）, improving the stability performance. The 210 h stability test of 8Ni-Al catalyst showed that conversion rate of CH_4 was around 90% with the deactivation rate of only 0.035%/h, lower than that of 8IMNi-Al catalyst within the 182 h endurance test. TG-DTG result demonstrated that carbon deposition rate of 8Ni-Al catalyst was only 0.34 mg/（h·gcat）, which was lower than that of 8IMNi-Al catalyst（0.80 mg/（h·gcat））. Therefore, the Ni-Al_2O_3 catalyst prepared by solution combustion method presented well stability.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第5期485-491,共7页
Journal of Inorganic Materials
基金
国家高技术研究发展计划(863计划)(2015AA050502)
新疆大学博士研究生创新项目(XJUBSCX-2013008)~~
