The effect of silica oxide support on the catalytic activity of nickel-molybdenum bimetallic catalyst toward ethanol steam reforming for hydrogen production
The effect of silica oxide support on the catalytic activity of nickel-molybdenum bimetallic catalyst toward ethanol steam reforming for hydrogen production
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DOI：
10.1016/j.cej.2022.135916
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发表时间：
2022-04-05
影响因子：
15.1
通讯作者：
Ha, Su
中科院分区：
文献类型：
--
作者：
Elharati, Mohamed A.;Lee, Kyung-Min;Ha, Su
考察了钼助剂和二氧化硅载体形态对镍钼双金属催化剂乙醇水蒸气重整反应性能的影响。采用有序介孔二氧化硅(SBA-15)和商业二氧化硅载体作为氧化物载体材料。采用湿法浸渍法制备了催化剂，并用X射线衍射、氢-TPR、比表面积、红外光谱和拉曼光谱等手段对催化剂进行了表征。研究表明，以SBA-15为载体的NiMo双金属催化剂在600℃的中温下具有较好的催化活性和较好的抗结焦性能。SBA-15分子筛具有均匀的介孔结构，平均孔径为-2 nm，可以阻碍碳的生成，从而改善其抗结焦性能。NiMo双金属催化剂对ESR的催化增强作用也可能与Mo助剂增强了NiMo纳米颗粒与SiO_2载体材料之间的相互作用，抑制了Ni纳米颗粒的团聚，从而进一步改善了NiMo纳米颗粒的分散性，抑制了其烧结有关。以SBA-15为载体的NiMo双金属催化剂表现出较高的氢产率为-54%，碳转化率为-89%，在600℃和65 h的水汽比为2的条件下具有良好的稳定性。
This paper investigates the effects of molybdenum promoter and silica oxide (SiO2) support morphology on the ethanol steam reforming (ESR) performance of Nickel-Molybdenum (NiMo) bimetallic catalysts. Ordered mesoporous SiO2 (SBA-15) and commercial SiO2 supports were used as the oxide support materials. The synthesized catalysts were prepared via the wet impregnation method and characterized via XRD, H2-TPR, BET, FTIR, and Raman techniques. This study shows that NiMo bimetallic catalyst supported on SBA-15 has superior catalytic activity and better coking resistance at an intermediate temperature of 600 degrees C than commercial SiO2 supported catalysts. The presence of a uniform mesoporous structure of SBA-15 with an average pore diameter of - 2 nm can obstruct the carbon formation, leading to improved coking resistance. The catalytic enhancement of NiMo bimetallic catalysts toward ESR can also be linked to the ability of Mo promoter in enhancing the interaction between NiMo nanoparticles and SiO2 support materials and restraining agglomeration of Ni nanoparticles, which results in further improvement of NiMo nanoparticle dispersion and inhibit its sintering. The NiMo bimetallic catalysts supported on SBA-15 illustrated the high H2 yield of - 54% and carbon conversion of - 89% with the excellent stability for ESR performed at 600 degrees C and the steam-to-carbon ratio of 2 over 65 h.