This paper investigated the influences of surface properties of carbon support and nickel precursors(nickel nitrate, nickel chloride and nickel acetate) on Ni nanoparticle sizes and catalytic performances for steam re...This paper investigated the influences of surface properties of carbon support and nickel precursors(nickel nitrate, nickel chloride and nickel acetate) on Ni nanoparticle sizes and catalytic performances for steam reforming of toluene. Treatment with nitric acid helped to increase the amount of functional groups on the surface and hydrophilic nature of carbon support, leading to a homogeneous distribution of Ni nanoparticles. The thermal decomposition products of nickel precursor also played an important role, Ni nanoparticles supported on carbon treated with acid using nickel nitrate as the precursor exhibited the smallest mean diameter of 4.5 nm. With the loading amount increased from 6 wt% to 18 wt%, the mean particle size of Ni nanoparticles varied from4.5 nm to 9.1 nm. The as-prepared catalyst showed a high catalytic activity and a good stability for toluene steam reforming: 98.1% conversion of toluene was obtained with the Ni content of 12 wt% and the S/C ratio of3, and the conversion only decreased to 92.0% after 700 min. Because of the high activity, good stability, and low cost, the as-prepared catalyst opens up new opportunities for tar removing.展开更多
【目的】寻找可以调控孔道尺寸的催化剂材料,以实现对焦油的有效脱除,解决生物质气化过程中的瓶颈问题。【方法】首先以具有多孔结构的聚多巴胺碳材料作为载体,采用水蒸气活化聚多巴胺碳材料和浸渍法负载金属等手段,制备载铁碳基焦油裂...【目的】寻找可以调控孔道尺寸的催化剂材料,以实现对焦油的有效脱除,解决生物质气化过程中的瓶颈问题。【方法】首先以具有多孔结构的聚多巴胺碳材料作为载体,采用水蒸气活化聚多巴胺碳材料和浸渍法负载金属等手段,制备载铁碳基焦油裂解催化剂;然后通过扫描电子显微镜(scanning electron microscope,SEM)、透射电子显微镜(transmission electron microscope,TEM)、全自动物理吸附仪(brunner emmett teller,BET)、傅里叶红外光谱仪(Fourier transform infrared spectroscopy,FTIR)等仪器对样品的物理化学性质进行表征;最后采用甲苯作为焦油模型验证材料的催化效果。【结果】活化温度的提高和活化时间的增加可以有效增大材料的比表面积和孔体积,而改变活化气氛中的水蒸气体积分数对材料的比表面积和孔体积影响不大;负载铁的聚多巴胺碳基催化剂的比表面积和孔体积,随着负载铁浸渍液的硝酸铁质量分数的升高先增大后降低,它的甲苯脱除效率也是如此。【结论】本研究结果可为焦油裂解催化剂的研究提供理论指导和技术创新参考。展开更多
基金Supported by the National Natural Science Foundation of China(21606008,21436002)the National Basic Research Foundation of China(2013CB733600)the Fundamental Research Funds for the Central Universities(ZY1630,JD1617,buctrc201616,and buctrc201617)
文摘This paper investigated the influences of surface properties of carbon support and nickel precursors(nickel nitrate, nickel chloride and nickel acetate) on Ni nanoparticle sizes and catalytic performances for steam reforming of toluene. Treatment with nitric acid helped to increase the amount of functional groups on the surface and hydrophilic nature of carbon support, leading to a homogeneous distribution of Ni nanoparticles. The thermal decomposition products of nickel precursor also played an important role, Ni nanoparticles supported on carbon treated with acid using nickel nitrate as the precursor exhibited the smallest mean diameter of 4.5 nm. With the loading amount increased from 6 wt% to 18 wt%, the mean particle size of Ni nanoparticles varied from4.5 nm to 9.1 nm. The as-prepared catalyst showed a high catalytic activity and a good stability for toluene steam reforming: 98.1% conversion of toluene was obtained with the Ni content of 12 wt% and the S/C ratio of3, and the conversion only decreased to 92.0% after 700 min. Because of the high activity, good stability, and low cost, the as-prepared catalyst opens up new opportunities for tar removing.
文摘【目的】寻找可以调控孔道尺寸的催化剂材料,以实现对焦油的有效脱除,解决生物质气化过程中的瓶颈问题。【方法】首先以具有多孔结构的聚多巴胺碳材料作为载体,采用水蒸气活化聚多巴胺碳材料和浸渍法负载金属等手段,制备载铁碳基焦油裂解催化剂;然后通过扫描电子显微镜(scanning electron microscope,SEM)、透射电子显微镜(transmission electron microscope,TEM)、全自动物理吸附仪(brunner emmett teller,BET)、傅里叶红外光谱仪(Fourier transform infrared spectroscopy,FTIR)等仪器对样品的物理化学性质进行表征;最后采用甲苯作为焦油模型验证材料的催化效果。【结果】活化温度的提高和活化时间的增加可以有效增大材料的比表面积和孔体积,而改变活化气氛中的水蒸气体积分数对材料的比表面积和孔体积影响不大;负载铁的聚多巴胺碳基催化剂的比表面积和孔体积,随着负载铁浸渍液的硝酸铁质量分数的升高先增大后降低,它的甲苯脱除效率也是如此。【结论】本研究结果可为焦油裂解催化剂的研究提供理论指导和技术创新参考。
基金supported by the Joint Fund of Coal-based Low Carbon by NSFC and Shanxi Provincial Government of China(U1710105)the National Key R&D Program of China(2016YFB0600301)
