Promoting effect of MgO addition to Pt/Ni/CeO2/Al2O3 in the steam gasification of biomass

被引:97
作者
Nakamura, Kazuya [1 ]
Miyazawa, Tomohisa [1 ]
Sakurai, Takuya [1 ]
Miyao, Toshihiro [2 ]
Naito, Shuichi [2 ]
Begum, Noorjahan [1 ]
Kunimori, Kimio [1 ]
Tomishige, Keiichi [1 ]
机构
[1] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan
[2] Kanagawa Univ, Fac Engn, Dept Appl Chem, Kanazawa Ku, Kanagawa 2218686, Japan
关键词
Steam gasification; Biomass; Steam reforming; Tar; Regeneration; Re-dispersion; Ni; MgO; Solid solution; Synthesis gas; FLUIDIZED-BED REACTOR; CATALYTIC PARTIAL OXIDATION; ABSORPTION FINE-STRUCTURE; SOLID-SOLUTION CATALYSTS; CARBON DEPOSITION; LOW-TEMPERATURE; SYNTHESIS GAS; NI CATALYSTS; RH/CEO2/SIO2; CATALYSTS; PRESSURIZED CONDITIONS;
D O I
10.1016/j.apcatb.2008.07.016
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
Pt/Ni/CeO2/Al2O3 catalyst showed the high performance in the steam gasification of cedar wood at the initial stage, however, the catalyst was deactivated within 2 h. According to the catalyst characterization by means of XRD and Ni K-edge EXAFS, it is found that aggregation of Ni metal particles causes the deactivation. In contrast, the Pt/Ni/CeO2/MgO/Al2O3 showed the high catalytic activity and stability. The addition of MgO to Pt/Ni/CeO2/Al2O3 decreased the reduction degree of Ni, but increased the dispersion of the Ni metal particles. As a result, the activity of Pt/Ni/CeO2/MgO/Al2O3 was comparable to that of Pt/Ni/CeO2/Al2O3. The Pt/Ni/CeO2/MgO/Al2O3 had high resistance to the aggregation, which can be related to high stability. Another important point is that the aggregated Ni particles on the Pt/Ni/CeO2/MgO/Al2O3 became re-dispersed by the catalyst regeneration (oxidation and reduction). The re-dispersion can proceed via the formation of the NiO-MgO solid solution by oxidation and the reduction of the NiO-MgO from the results of XRD and Ni K-edge EXAFS. (C) 2008 Elsevier B.V. All rights reserved.
引用
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页码:36 / 44
页数:9
相关论文
共 47 条
[1]   Real-space multiple-scattering calculation and interpretation of x-ray-absorption near-edge structure [J].
Ankudinov, AL ;
Ravel, B ;
Rehr, JJ ;
Conradson, SD .
PHYSICAL REVIEW B, 1998, 58 (12) :7565-7576
[2]   Gasification of different biomasses in a dual-bed gasifier system combined with novel catalysts with high energy efficiency [J].
Asadullah, M ;
Miyazawa, T ;
Ito, SI ;
Kunimori, K ;
Yamada, M ;
Tomishige, K .
APPLIED CATALYSIS A-GENERAL, 2004, 267 (1-2) :95-102
[3]   A comparison of Rh/CeO2/SiO2 catalysts with steam reforming catalysts, dolomite and inert materials as bed materials in low throughput fluidized bed gasification systems [J].
Asadullah, M ;
Miyazawa, T ;
Ito, S ;
Kunimori, K ;
Koyama, S ;
Tomishige, K .
BIOMASS & BIOENERGY, 2004, 26 (03) :269-279
[4]   Catalyst development for the gasification of biomass in the dual-bed gasifier [J].
Asadullah, M ;
Miyazawa, T ;
Ito, S ;
Kunimori, K ;
Yamada, M ;
Tomishige, K .
APPLIED CATALYSIS A-GENERAL, 2003, 255 (02) :169-180
[5]   Catalyst performance of Rh/CeO2/SiO2 in the pyrogasification of biomass [J].
Asadullah, M ;
Miyazawa, T ;
Ito, S ;
Kunimori, K ;
Tomishige, K .
ENERGY & FUELS, 2003, 17 (04) :842-849
[6]   Demonstration of real biomass gasification drastically promoted by effective catalyst [J].
Asadullah, M ;
Miyazawa, T ;
Ito, S ;
Kunimori, K ;
Tomishige, K .
APPLIED CATALYSIS A-GENERAL, 2003, 246 (01) :103-116
[7]   Energy efficient production of hydrogen and syngas from biomass: Development of low-temperature catalytic process for cellulose gasification [J].
Asadullah, M ;
Ito, SI ;
Kunimori, K ;
Yamada, M ;
Tomishige, K .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2002, 36 (20) :4476-4481
[8]   Biomass gasification to hydrogen and syngas at low temperature: Novel catalytic system using fluidized-bed reactor [J].
Asadullah, M ;
Ito, S ;
Kunimori, K ;
Yamada, M ;
Tomishige, K .
JOURNAL OF CATALYSIS, 2002, 208 (02) :255-259
[9]   CARBON DEPOSITION IN STEAM REFORMING AND METHANATION [J].
BARTHOLOMEW, CH .
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1982, 24 (01) :67-112
[10]   Catalytic performance and catalyst structure of nickel-magnesia catalysts for CO2 reforming of methane [J].
Chen, YG ;
Tomishige, K ;
Yokoyama, K ;
Fujimoto, K .
JOURNAL OF CATALYSIS, 1999, 184 (02) :479-490