Hydrodeoxygenation of phenol over Ni/Ce1-xNbxO2 catalysts

被引：84

作者：

Resende, Karen A. ^{[1
]}

Braga, Adriano H. ^{[2
]}

Noronha, Fabio B. ^{[3
,4
]}

Hori, Carla E. ^{[1
]}

机构：

[1] Univ Fed Uberlandia, Sch Chem Engn, Av Joao Naves Avila 2121,Bloco 1 K, BR-38400098 Uberlandia, MG, Brazil

[2] Univ Sao Paulo, Inst Chem, Av Prof Lineu Prestes 748, Sao Paulo, Brazil

[3] Natl Inst Technol, Div Catalysis & Chem Proc, Av Venezuela 82, BR-20081312 Rio De Janeiro, Brazil

[4] Mil Inst Engn, Chem Engn Dept, Praca Gal Tiburcio 80, BR-22290270 Rio De Janeiro, Brazil

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2019年 / 245卷

关键词：

Phenol; Bio-oil; Hydrodeoxygenation; Cerium oxide; Niobium addition; GAS-PHASE HYDRODEOXYGENATION; X-RAY; PHOTOELECTRON-SPECTROSCOPY; LIQUID ALKANES; CERIUM OXIDE; MIXED OXIDES; METAL TYPE; DIFFRACTION; GUAIACOL; REDUCTION;

D O I：

10.1016/j.apcatb.2018.12.040

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This work investigated the effect of different niobium concentration on the performance of Ni/Ce1-xNbxO2 catalyst for hydrodeoxygenation of phenol in gas phase at 300 degrees C. Also, the structural modification promoted by Nb addition was studied by several techniques. In situ X-ray diffraction and Raman analyses indicated that high niobium concentration lead to Nb2O5 oxide with hexagonal structure, while in situ X-ray photoelectron spectroscopy (XPS) experiments indicated an enrichment of the surface with Nb. In general, the incorporation of niobium changed the lattice parameter of ceria and promoted the formation of oxygen vacancies as observed by XPS and X-ray absorption near edge structure (XANES) analyses, which favored the activity of the sample. Increasing Nb content increased the selectivity to deoxygenated products (benzene). The superior benzene selectivity is likely due to the higher interaction between the oxygen of phenol molecule and the oxophilic sites represented by the Nb+ cations of the support that promotes the hydrogenation of carbonyl group.

引用

页码：100 / 113

页数：14

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