Behavior of nickel catalysts in supercritical water gasification of glucose: Influence of support

被引：54

作者：

Lu, Youjun ^{[1
]}

Zhu, Yiming ^{[1
]}

Li, Sha ^{[1
]}

Zhang, Ximin ^{[1
]}

Guo, Liejin ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, SKLMFPE, Xian 710049, Shaanxi, Peoples R China

来源：

BIOMASS & BIOENERGY | 2014年 / 67卷

关键词：

Ni catalysts; Hydrogen production; Supercritical water gasification; Coke deposition; Support; PRESSURE AQUEOUS ENVIRONMENTS; HYDROGEN-PRODUCTION; BIOMASS GASIFICATION; HYDROTHERMAL GASIFICATION; MODEL COMPOUNDS; WASTE-WATER; CELLULOSE; LIGNIN; HYDROPYROLYSIS; TEMPERATURE;

D O I：

10.1016/j.biombioe.2014.04.038

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

The catalytic performance of Ni-based supercritical water gasification (SCWG) catalysts may be influenced strongly by the nature of support. In this paper, Ni catalysts with the different supports (CeO2/Al2O3, La2O3/Al2O3, MgO/Al2O3, ZrO2/Al2O3) were prepared by two-step impregnation method. The fresh and used catalysts were characterized by X-ray diffraction patterns (XRD), scanning electron microscopy with an Energy Dispersive X-ray (SEM-EDX), Brunauer Emmett Teller (BET) specific surface area measurements, X-ray photoelectron spectroscopy (XPS) and Thermo-gravimetric analyses (TGA). The catalyst performance testing was conducted by SCWG of glucose at 673 K and 23.5 MPa with an autoclave reactor, to evaluate the influence of support on the hydrogen production. The results showed that H-2 yield for different supports decreased in order: CeO2/Al2O3 > La2O3/Al2O3 > MgO/Al2O3 > Al2O3 > ZrO2/Al2O3, and H-2 selectivity decreased in order: CeO2/Al2O3 > La2O3/Al2O3 > ZrO2/Al2O3 > Al2O3 > MgO/Al2O3. Ni catalysts were deactivated in SCWG reaction because of sintering and coke deposition. Compared with other supports, CeO2 can be used as the promoter of carbon removal from catalyst surfaces. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：125 / 136

页数：12

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