Characterization and reactivity of Nb2O5 supported Ru catalysts
2009年1月25日 · In the present investigation, we report for the first time a systematic study of Ru/Nb 2 O 5 catalysts for the hydrodechlorination of 1,2,4-trichlorobenzene and the characterization of catalysts using various techniques like X-ray diffraction (XRD), temperature programmed reduction (TPR), temperature programmed desorption (TPD) of H 2 and pulse ...
Correlation of the catalytic performance with Nb2O5 surface …
2019年7月1日 · Excellent p-cresol and lignin HDO performance is achieved over Ru/L-Nb 2 O 5 catalyst. Unsaturated NbO x species strongly influences the activity of p-cresol HDO. Ru particle size has a strong effect on toluene selectivity. A promising catalyst-design strategy for arene production from lignin is provided.
Regulating the crystal phase of Pd/Nb2O5 for vanillin selective …
2023年7月1日 · Herein, a series of Pd/Nb 2 O 5 catalysts of pseudohexagonal crystal phase (Nb 2 O 5 -TT), orthorhombic phase (Nb 2 O 5 -T) and monoclinic phase (Nb 2 O 5 -H) are prepared through regulating the annealing temperature.
H 2 -TPR Profiles for Nb 2 O 5 Support and Ni/Nb 2 O 5 Catalyst ...
In biomass conversion, Nb2O5 has attracted increasing attention as a catalyst support presenting water-tolerant Lewis acid sites. Herein, we address the design of Ni/Nb2O5 catalysts for...
Characterization and Reactivity of Molybdenum Oxide Catalysts …
2001年4月19日 · A series of MoO3/Nb2O5 catalysts with Mo loadings varying from 2.5 to 15 wt % were prepared and characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), temperature-program...
Pt-Ru/Nb2O5-SiO2催化甘油氢解中 Ru的促进机制研究
2024年1月18日 · 摘要： 采用顺序浸渍法引入第二金属Ru,制备了 Pt-Ru/Nb2O5-SiO2催化剂用于强化甘油氢解反应,并利用XRD、N2吸附-脱附、H2-TPR、H2-TPD、NH3-TPD、XPS、HAADF-STEM等方法考察了 Ru的促进机制.实验结果表明,Ru的引入量与催化活性呈"火山型"曲线关系,当Ru负载量为4％(w)时,Pt-Ru/Nb2O5 ...
H2-TPR profiles of Nb2O5, NiO, NiAl2O4, Nb2O5-NiAl2O4, and …
Download scientific diagram | H2-TPR profiles of Nb2O5, NiO, NiAl2O4, Nb2O5-NiAl2O4, and Ni-Nb–O catalysts from publication: Nb2O5 modified NiAl2O4 catalysts for hydrodeoxygenation of...
Nb2O5 对二氧化铈掺杂 Ni 催化剂对 1,3-丁二烯选择性加氢生成丁 …
H2-TPR 表明，催化剂中包含氧化铌可赋予更强的金属载体相互作用，促进氧化铈的表面和本体还原，并改善表面 Ce3+ 的形成，XPS 分析证实。 1,3-丁二烯转化率在 100 °C-350 °C 之间进行测试，催化剂在较低镍负载量下表现出高转化率。 我们发现，即使在更高的温度下，铌夹杂物也会使选择性接近完全形成丁烯。 在温度高于 250 °C 时观察到活性开始下降，同时形成丙烯和丙烷以及丁烷消失。 根据反应结果和程序升温氧化分析（TPO），我们提出了导致失活的反应机理，这 …
TPR profile of: (a) Nb 2 O 5 amorphous, (b) PtNb/C
Catalysts prepared by a combined alcohol-sodium borohydride reduction method showed crystal sizes in the range of 3-4 nm, with large amounts of niobium oxide, as TPR results... | Ethanol,...
An efficient bifunctional Ni-Nb2O5 nanocatalysts for the ...
2022年9月1日 · The TPR curve of bulk nickel oxide shows a reduction peak at around 450 °C, which is caused by the Ni 2+ → Ni 0 reduction step. With the increase of niobium content, the reduction peak moves towards a high temperature, indicating that the interaction between nickel and niobium oxide is enhanced.