当前位置: X-MOL 学术Int. J. Hydrogen Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Synthesis and characterization of Zr-promoted Ni-Co bimetallic catalyst supported OMC and investigation of its catalytic performance in steam reforming of ethanol
International Journal of Hydrogen Energy ( IF 8.1 ) Pub Date : 2018-03-16 , DOI: 10.1016/j.ijhydene.2018.02.139
Vahid Shahed gharahshiran , Mardali Yousefpour

This article presents simple method for the OMC-6%Ni-6%Co (ordered mesoporous carbon containing Ni and Co metallic nanoparticles) catalyst synthesis with high surface area and more proper bimetallic nanoparticle dispersion; prepared successfully by soft template hydrothermal method and different zirconium loadings (0.5, 1, 2 wt %) accomplished by impregnation method, which was known as a desired method for the metal dispersion. The catalysts with/without promoter, were characterized by XRD, FTIR and N2 adsorption-desorption isotherms, FESEM, EDS, EDS mapping, HRTEM and TPR techniques and investigated in steam reforming of ethanol (SRE) at 250–400 °C. XRD and BET results indicated that zirconium addition more than 0.5% wt, decreased the average mesopore diameter of catalysts, total pore volume and particles size. Also, it was stated that Ni2+ and Co2+ were caught by the RF/F127 network and further reduced into metallic Ni and Co nanoparticles during the carbonization. The Ni and Co nanoparticles were well-dispersed in the OMC walls. FTIR spectroscopy revealed that F127 left the structure and formed the porous structure. TPR analysis of OMC-6%Ni-6%Co/2%Zr sample, indicated that the sample is reduced easily at low temperatures. FESEM and HRTEM images showed that carbon was precipitated in the CNT form on spent catalyst samples surfaces and confirmed the position of Ni and Co bimetallic nanoparticles on the CNTs tip in the OMC-6%Ni-6%Co/2%Zr sample. 2% Zr-promoted bimetallic catalyst revealed appropriate catalytic performance for SRE, such as high activity, hydrogen yield and proper stability due to the synergistic catalysis of cobalt and nickel. Also, effective factors, such as H2O/EtOH molar ratio and gas hourly space velocity (GHSV) were investigated on the OMC-6%Ni-6%Co/2%Zr catalyst sample.



中文翻译:

Zr促进Ni-Co双金属催化剂负载的OMC的合成,表征及其在乙醇蒸汽重整中的催化性能研究

本文提出了一种具有高表面积和更合适的双金属纳米颗粒分散的OMC-6%Ni-6%Co(有序介孔碳,包含Ni和Co金属纳米颗粒)催化剂的简单合成方法。通过软模板水热法成功地制备,并且通过浸渍法完成了不同的锆负载量(0.5、1、2 wt%),这被认为是金属分散的理想方法。带有/不带有助催化剂的催化剂通过XRD,FTIR和N 2表征吸附-解吸等温线,FESEM,EDS,EDS作图,HRTEM和TPR技术,并在250–400°C的乙醇蒸汽重整(SRE)中进行了研究。XRD和BET结果表明,锆的添加量超过0.5重量%,降低了催化剂的平均中孔直径,总孔体积和粒径。另外,据称Ni 2+和Co 2+被RF / F127网络捕获并在碳化过程中进一步还原为金属Ni和Co纳米颗粒。Ni和Co纳米粒子很好地分散在OMC壁中。FTIR光谱显示F127离开了结构并形成了多孔结构。对OMC-6%Ni-6%Co / 2%Zr样品的TPR分析表明,该样品在低温下容易还原。FESEM和HRTEM图像表明,碳以CNT形式沉淀在废催化剂样品表面上,并确认了OMC-6%Ni-6%Co / 2%Zr样品中CNT尖端上Ni和Co双金属纳米颗粒的位置。2%Zr促进的双金属催化剂由于钴和镍的协同催化作用而具有适当的SRE催化性能,如高活性,氢产率和适当的稳定性。另外,有效因素,例如H在OMC-6%Ni-6%Co / 2%Zr催化剂样品上研究了2 O / EtOH摩尔比和气体时空速度(GHSV)。

更新日期:2018-03-16
down
wechat
bug