Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2020-12-26 , DOI: 10.1016/j.micromeso.2020.110842
Yao Lu , Dan Guo , Yifan Zhao , Perseverence S. Moyo , Yujun Zhao , Shengping Wang , Xinbin Ma
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Novel structure catalyst of Ni@S2-T with Ni nanoparticles highly dispersed in silicalite-2 zeolite (S2) was designed and synthesized via novel two-steps methods, micro-emulsion method followed by solvent-free crystallization route. Due to the unique two-step synthetic process, the confinement effect of the silicalite-2 shell and stronger metal-support interaction caused by the formation of Ni phyllosilicate intermediate in shell, were regarded as the main reasons for the superb catalytic performances of Ni@S2-T for dry reforming of methane (DRM). Compared with Ni–SiO2 by micro-emulsion method, Ni/S2 by impregnation method and Ni@S2–O by direct crystallization, Ni@S2-T catalyst exhibited optimal catalytic activity and stability for DRM. No activity loss was observed during 70 h at high GHSV of 240000 mL g−1h−1. Meanwhile, over spent Ni@S2-T catalyst, hardly any coke was found after the prolonged test, which indicated the remarkable anti-coking ability of Ni@S2-T.
中文翻译:
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来自页硅酸镍结构的Ni纳米颗粒在硅胶2壳中的有限高分散性,用于甲烷的干重整,性能增强
通过新颖的两步法,微乳化法和无溶剂结晶法,设计合成了具有高度分散在silicalite-2沸石(S2)中的Ni纳米粒子的Ni @ S2-T结构催化剂。由于独特的两步合成过程,siliconlite-2壳的局限作用和壳中形成页硅酸镍中间体引起的较强的金属-载体相互作用被认为是Ni @催化性能优异的主要原因。 S2-T用于甲烷的干重整(DRM)。与微乳液法的Ni-SiO 2,浸渍法的Ni / S2和直接结晶的Ni @ S2-O相比,Ni @ S2-T催化剂对DRM表现出最佳的催化活性和稳定性。在高GHSV为240000 mL g的情况下,在70小时内未观察到活性降低-1小时-1。同时,经过长时间测试,Ni @ S2-T催化剂用尽,几乎没有发现焦炭,这表明Ni @ S2-T具有显着的抗焦能力。