Effect of the reactive gas on the solid-state transformation of molybdenum trioxide to carbides and nitrides

被引:67
作者
Li, SZ
Kim, WB
Lee, JS [1 ]
机构
[1] Pohang Univ Sci & Technol, Dept Chem Engn, Pohang 790784, South Korea
[2] Pohang Univ Sci & Technol, Sch Environm Engn, Pohang 790784, South Korea
关键词
D O I
10.1021/cm9800229
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 temperature-programmed reaction method was employed to investigate the solid-state transformation of molybdenum oxides to carbides or nitrides by reaction with various reacting gases such as H-2 and NH3 and the mixtures of CH4 and H-2 (CH4/H-2 1/4), CO and H-2 (CO/H-2 1/4), and N-2 and H-2 (N-2/H-2 1/3 and 3/1). The solid-state transformation of MoO3 to nitride by reaction with NH3 was topotactic. In contrast, MoO3 took a nontopotactic route by reaction with the other gases or their mixtures, leading to products that were thermodynamically stable under the investigated conditions. For the synthesis to take a topotactic route it required that the carburization or nitridation occurs in the initial stage of reduction to form intermediate phases containing carbon or nitrogen at low temperatures.
引用
收藏
页码:1853 / 1862
页数:10
相关论文
共 22 条
[1]   CATALYTIC HYDROTREATING OF INDOLE, BENZOTHIOPHENE, AND BENZOFURAN OVER MO2N [J].
ABE, H ;
BELL, AT .
CATALYSIS LETTERS, 1993, 18 (1-2) :1-8
[2]   MOLYBDENUM-CARBON CATALYSTS FOR REFORMING REACTIONS [J].
BRIDGEWATER, AJ ;
BURCH, R ;
MITCHELL, PCH .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1980, 76 :1811-1820
[3]   SYNTHESIS, CHARACTERIZATION, AND CATALYTIC PROPERTIES OF CLEAN AND OXYGEN-MODIFIED TUNGSTEN CARBIDES [J].
IGLESIA, E ;
RIBEIRO, FH ;
BOUDART, M ;
BAUMGARTNER, JE .
CATALYSIS TODAY, 1992, 15 (02) :307-337
[4]   PREPARATION OF HIGH-SURFACE-AREA TRANSITION-METAL NITRIDES - MO2N AND MON [J].
JAGGERS, CH ;
MICHAELS, JN ;
STACY, AM .
CHEMISTRY OF MATERIALS, 1990, 2 (02) :150-157
[5]   CARBON AND OXYGEN ATOM MOBILITY DURING ACTIVATION OF MO2C CATALYSTS [J].
LEARY, KJ ;
MICHAELS, JN ;
STACY, AM .
JOURNAL OF CATALYSIS, 1986, 101 (02) :301-313
[6]   PREPARATION AND BENZENE HYDROGENATION ACTIVITY OF SUPPORTED MOLYBDENUM CARBIDE CATALYSTS [J].
LEE, JS ;
YEOM, MH ;
PARK, KY ;
NAM, IS ;
CHUNG, JS ;
KIM, YG ;
MOON, SH .
JOURNAL OF CATALYSIS, 1991, 128 (01) :126-136
[7]   MOLYBDENUM CARBIDE CATALYSTS .1. SYNTHESIS OF UNSUPPORTED POWDERS [J].
LEE, JS ;
OYAMA, ST ;
BOUDART, M .
JOURNAL OF CATALYSIS, 1987, 106 (01) :125-133
[8]   HYDRODESULFURIZATION OF THIOPHENE OVER UNSUPPORTED MOLYBDENUM CARBIDE [J].
LEE, JS ;
BOUDART, M .
APPLIED CATALYSIS, 1985, 19 (01) :207-210
[9]   MOLYBDENUM CARBIDE CATALYSTS .3. TURNOVER RATES FOR THE HYDROGENOLYSIS OF N-BUTANE [J].
LEE, JS ;
LOCATELLI, S ;
OYAMA, ST ;
BOUDART, M .
JOURNAL OF CATALYSIS, 1990, 125 (01) :157-170
[10]   IN-SITU CARBURIZATION OF METALLIC MOLYBDENUM DURING CATALYTIC REACTIONS OF CARBON-CONTAINING GASES [J].
LEE, JS ;
BOUDART, M .
CATALYSIS LETTERS, 1993, 20 (1-2) :97-106