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Multi-Ni@Ni phyllosilicate hollow sphere for CO2 reforming of CH4: influence of Ni precursors on structure, sintering, and carbon resistance†
Catalysis Science & Technology ( IF 5 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1039/c8cy00024g
Ziwei Li 1, 2, 3 , Sibudjing Kawi 1, 2, 3
Affiliation  

Multi-Ni@Ni phyllosilicate hollow spheres (NiPhy HS) were synthesized using different Ni precursors via hydrothermal and H2 reduction methods. Precursor effects to the NiPhy HS structure and catalytic performance for CO2 (dry) reforming of the CH4 (DRM) reaction were investigated and established. Ni@NiPhy-(Ac)2 achieved near equilibrium conversions with negligible carbon formation for the DRM reaction at 700 °C. The structure of NiPhy HS was influenced by different nickel precursors because Ni ions with different sizes were produced leading to their relatively different diffusion speeds through the previously formed NiPhy layer to further react with the silicate ions near the unreacted silica surface in the core part to form the new NiPhy phases. The unique pore structure with smallest pore size and pore volume for NiPhy-(Ac)2 compared with NiPhy-OAc and NiPhy-NO3 contributes to eliminating the deposition of carbon species due to the confinement effect. In addition, the strongest interaction between Ni and NiPhy phases for NiPhy-(Ac)2 inhibits the sintering of Ni nanoparticles and prevents the lifting away of Ni from NiPhy phases by the deposited carbon species thereby retarding the growth of carbon nanotubes. This study demonstrates a method to design other metal (M = Co, Fe, and Cu) phyllosilicate nano-hollow spheres with high metal loading as high sintering and carbon resistant catalysts for other catalytic applications.

中文翻译:

用于CH 4的CO 2重整的多Ni @ Ni页硅酸盐空心球:Ni前驱物对结构,烧结和耐碳性的影响

通过水热和H 2还原方法,使用不同的Ni前驱体合成了多Ni @ Ni页硅酸盐空心球(NiPhy HS)。研究并建立了前体对NiPhy HS结构的影响以及CH 4(DRM)反应的CO 2(干式)重整的催化性能。Ni @ NiPhy-(Ac)2在700°C下,DRM反应可达到接近平衡的转化率,且碳的形成量可忽略不计。NiPhy HS的结构受到不同的镍前驱物的影响,因为产生了不同尺寸的Ni离子,导致它们在先前形成的NiPhy层中的扩散速度相对不同,从而进一步与核心部分未反应的二氧化硅表面附近的硅酸根离子反应而形成新的NiPhy阶段。与NiPhy-OAc和NiPhy-NO 3相比,NiPhy-(Ac)2具有最小的孔径和孔体积的独特孔结构有助于消除碳物质的限制作用。此外,NiPhy-(Ac)2的Ni和NiPhy相之间最强的相互作用抑制了镍纳米粒子的烧结,并防止了沉积的碳物质将镍从NiPhy相中带走,从而阻碍了碳纳米管的生长。这项研究证明了一种设计具有高金属负载量的其他金属(M = Co,Fe和Cu)金属硅酸盐纳米空心球的方法,该材料可作为高烧结性和耐碳催化剂用于其他催化应用。
更新日期:2018-03-07
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