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Effect of Additives on Ni‐Based Catalysts for Hydrogen‐Enriched Production from Steam Reforming of Biomass
Energy Technology ( IF 3.6 ) Pub Date : 2020-06-18 , DOI: 10.1002/ente.202000136 Xuetao Wang 1 , Xiaoxin Su 1 , Qianwei Zhang 1 , Haipeng Hu 1
Energy Technology ( IF 3.6 ) Pub Date : 2020-06-18 , DOI: 10.1002/ente.202000136 Xuetao Wang 1 , Xiaoxin Su 1 , Qianwei Zhang 1 , Haipeng Hu 1
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The catalytic steam reforming of biomass for hydrogen production is investigated in a fixed‐bed reactor. A suitable additive and precursor is found in various additives (cobalt, strontium, and lanthanum) and nickel salt precursors (nickel nitrate, nickel acetate, nickel chloride, and nickel sulfate). Synthesized samples are characterized by X‐ray diffraction (XRD), NH3 temperature‐programmed desorption (TPD), H2 temperature‐programmed reduction (TPR), and transmission electron microscopy (TEM). Results show that Co and La doping of the Ni/Al2O3 catalyst improves the dispersion of surface‐active particles and reduces the particle size, increasing H2 production. The hydrogen volume fraction of La‐modified catalysts with 10% Ni is 38.96%, which is higher than 30.39% for the unmodified Ni/Al2O3 catalyst. The lowest hydrogen yield of Ni–Sr/Al2O3 catalyst is 19.22%. This low catalytic activity is due to the reaction of Ni–Sr/Al2O3 with SiO2 found in biomass ash, which generates silicate without catalytic effect. The silicate melts and adheres to the catalyst surface at a high temperature, inhibiting the catalysis of nickel active sites. The maximum hydrogen yield obtained with nickel acetate as catalyst precursor is 51.41%, which is due to nickel acetate decomposing and forming more NiO in the amorphous state and improving the performance of catalyst.
中文翻译：
添加剂对生物质蒸汽重整制氢富氢生产镍基催化剂的影响
在固定床反应器中研究了用于生产氢气的生物质的催化蒸汽重整。在各种添加剂（钴，锶和镧）和镍盐前体（硝酸镍，乙酸镍，氯化镍和硫酸镍）中发现了合适的添加剂和前体。合成样品的特征在于X射线衍射（XRD），NH 3程序升温脱附（TPD），H 2程序升温还原（TPR）和透射电子显微镜（TEM）。结果表明，Ni和Al 2 O 3的Co和La掺杂催化剂改善了表面活性颗粒的分散性并减小了粒径，增加了氢气的产生。Ni含量为10％的La改性催化剂的氢体积分数为38.96％，高于未改性的Ni / Al 2 O 3催化剂的30.39％。Ni-Sr / Al 2 O 3催化剂的最低氢气产率为19.22％。这种低催化活性是由于Ni-Sr / Al 2 O 3与SiO 2反应在生物质灰分中发现，会产生硅酸盐而没有催化作用。硅酸盐在高温下熔化并粘附在催化剂表面上，从而抑制了镍活性位点的催化作用。用乙酸镍作为催化剂前体获得的最大氢产率为51.41％，这是由于乙酸镍分解并形成了更多的非晶态的NiO，并提高了催化剂的性能。
更新日期：2020-06-18
中文翻译：
添加剂对生物质蒸汽重整制氢富氢生产镍基催化剂的影响
在固定床反应器中研究了用于生产氢气的生物质的催化蒸汽重整。在各种添加剂（钴，锶和镧）和镍盐前体（硝酸镍，乙酸镍，氯化镍和硫酸镍）中发现了合适的添加剂和前体。合成样品的特征在于X射线衍射（XRD），NH 3程序升温脱附（TPD），H 2程序升温还原（TPR）和透射电子显微镜（TEM）。结果表明，Ni和Al 2 O 3的Co和La掺杂催化剂改善了表面活性颗粒的分散性并减小了粒径，增加了氢气的产生。Ni含量为10％的La改性催化剂的氢体积分数为38.96％，高于未改性的Ni / Al 2 O 3催化剂的30.39％。Ni-Sr / Al 2 O 3催化剂的最低氢气产率为19.22％。这种低催化活性是由于Ni-Sr / Al 2 O 3与SiO 2反应在生物质灰分中发现，会产生硅酸盐而没有催化作用。硅酸盐在高温下熔化并粘附在催化剂表面上，从而抑制了镍活性位点的催化作用。用乙酸镍作为催化剂前体获得的最大氢产率为51.41％，这是由于乙酸镍分解并形成了更多的非晶态的NiO，并提高了催化剂的性能。
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