Phosphorus promoted WS2/Al2O3 catalysts studied by transmission electron microscopy

被引:4
作者
CruzReyes, J
LopezAgudo, A
LopezCordero, R
AvalosBorja, M
Fuentes, S
Farias, MH
机构
[1] CTR INVEST QUIM, HAVANA, CUBA
[2] Univ Nacl Autonoma Mexico, INST FIS, LAB ENSENADA, ENSENADA 22800, BAJA CALIFORNIA, MEXICO
[3] CSIC, INST CATALISIS & PETR QUIM, MADRID 28049, SPAIN
关键词
phosphorus-containing catalysts; tungsten disulfide; high-resolution electron microscopy;
D O I
10.1007/BF00810676
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
A series of WS2/Al2O3 catalysts containing a varied amount of phosphorus (0.0, 2.5 and 6.0 wt% P2O5), sulfided at two different temperatures (873 and 1073 K), were studied by means of high-resolution transmission electron microscopy (HRTEM). The stacking of(002) layers in the WS2-2H crystallites of the ''rag'' structure increases with the addition of phosphorus, whereas its length is kept almost constant. At high sulfidation temperatures phosphorus shows a stabilizing affect on the catalysts by retarding the stacking growth of WS2 crystallites. Additionally, an aluminum phosphate crystalline phase is identified in the phosphorus promoted catalysts.
引用
收藏
页码:119 / 126
页数:8
相关论文
共 27 条
[1]  
[Anonymous], 1973, SULPHIDE CATALYSTS T
[2]   EFFECT OF CALCINATION AND WATER EXTRACTION ON THE DISTRIBUTION OF THE ACTIVE COMPONENTS IN THE OXIDE FORM OF PHOSPHORUS-NICKEL-MOLYBDENUM ALUMINA CATALYSTS FOR HYDRODESULFURIZATION [J].
ATANASOVA, P ;
UCHYTIL, J ;
KRAUS, M ;
HALACHEV, T .
APPLIED CATALYSIS, 1990, 65 (01) :53-68
[3]   INFLUENCE OF PHOSPHORUS CONCENTRATION ON THE TYPE AND STRUCTURE OF THE COMPOUNDS FORMED IN THE OXIDE FORM OF PHOSPHORUS-NICKEL-MOLYBDENUM ALUMINA CATALYSTS FOR HYDRODESULFURIZATION [J].
ATANASOVA, P ;
HALACHEV, T .
APPLIED CATALYSIS, 1989, 48 (02) :295-306
[4]  
ATANASOVA P, 1993, STUD SURF SCI CATAL, V75, P1907
[5]   Influence of alumina fluoridation on the dispersion and hydrotreating activity of W/Al2O3 catalysis [J].
Benitez, A ;
Ramirez, J ;
Vazquez, A ;
Acosta, D ;
Agudo, AL .
APPLIED CATALYSIS A-GENERAL, 1995, 133 (01) :103-119
[6]   THE ORIGIN OF CATALYTIC SYNERGY IN UNSUPPORTED CO-MO HDS CATALYSTS [J].
CANDIA, R ;
CLAUSEN, BS ;
TOPSOE, H .
JOURNAL OF CATALYSIS, 1982, 77 (02) :564-566
[7]  
Cruz Reyes J, 1994, APPL CATAL A-GEN, V120, P147
[8]   HYDRODESULFURIZATION CATALYSTS PREPARED BY 2 METHODS ANALYZED BY TRANSMISSION ELECTRON-MICROSCOPY [J].
CRUZREYES, J ;
AVALOSBORJA, M ;
FARIAS, MH ;
FUENTES, S .
JOURNAL OF CATALYSIS, 1992, 137 (01) :232-242
[9]  
CRUZREYES J, IN PRESS
[10]  
DEAGUDELO MMR, 1988, 9TH P INT C CAT CALG, V1, P42