Selective photo-assisted oxidation of methane into formaldehyde on mesoporous VOx/SBA-15 catalysts

被引:33
作者
López, HH [1 ]
Martínez, A [1 ]
机构
[1] Univ Politecn Valencia, CSIC, Inst Tecnol Quim, Valencia 46022, Spain
关键词
photo-oxidation of methane; vanadium oxide; SBA-15; formaldehyde;
D O I
10.1023/A:1020649313699
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
Mesoporous VOx/SBA-15 samples have been prepared by different impregnation methods, characterized by N-2 adsorption and diffuse reflectance UV-visible spectroscopy, and their photocatalytic reactivity evaluated for the selective oxidation of methane with oxygen at 220degreesC under UV irradiation. Vanadium in dehydrated VOx/SBA-15 samples was found to be predominantly as isolated four-coordinated V5+ species, especially at V loading below 2.5wt%. VOx/SBA-15 catalysts prepared by impregnation with an aqueous solution of ammonium metavanadate (AMV) showed a maximum rate of formation of formaldehyde of 525 mumol g(-1) h(-1) (selectivity of 93.8 mol%) at a vanadium content of 2.65 wt%. Both the rate of formation and selectivity of formaldehyde were improved when vanadium was impregnated on the SBA-15 support from a vanadyl sulfate methanolic solution (rate of formation of HCHO = 733 mumol g(-1) h(-1), selectivity = 95.4 mol%). VOx/SBA-15 catalysts were seen to be more effective for the selective photo-assisted oxidation of methane than VOx/SiO2 catalysts.
引用
收藏
页码:37 / 41
页数:5
相关论文
共 22 条
[1]   PREPARATION OF HIGHLY DISPERSED ANCHORED VANADIUM-OXIDES BY PHOTOCHEMICAL VAPOR-DEPOSITION METHOD AND THEIR PHOTOCATALYTIC ACTIVITY FOR ISOMERIZATION OF TRANS-2-BUTENE [J].
ANPO, M ;
SUNAMOTO, M ;
CHE, M .
JOURNAL OF PHYSICAL CHEMISTRY, 1989, 93 (04) :1187-1189
[2]   PHOTOINDUCED METHANOL CONVERSION TO HYDROCARBONS ON SUPPORTED MOO3 CATALYSTS [J].
ANPO, M ;
MIHARA, K ;
KUBOKAWA, Y .
JOURNAL OF CATALYSIS, 1986, 97 (01) :272-276
[3]  
ANPO M, 1990, STUD SURF SCI CATAL, V55, P683
[4]  
Anpo M., 2001, SCI CATAL, V135, P123
[5]   PHYSICOCHEMICAL CHARACTERIZATION OF V-SILICALITE [J].
CENTI, G ;
PERATHONER, S ;
TRIFIRO, F ;
ABOUKAIS, A ;
AISSI, CF ;
GUELTON, M .
JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (06) :2617-2629
[6]  
GRAETZEL M, 1989, J PHYS CHEM-US, V93, P4128
[7]   CATALYTIC SYNTHESIS OF METHANOL AND FORMALDEHYDE BY PARTIAL OXIDATION OF METHANE [J].
HALL, TJ ;
HARGREAVES, JSJ ;
HUTCHINGS, GJ ;
JOYNER, RW ;
TAYLOR, SH .
FUEL PROCESSING TECHNOLOGY, 1995, 42 (2-3) :151-178
[8]  
HIGASHIMOTO S, 2001, STUD SURF SCI CATAL, V135, P2288
[9]  
KALIAGUINE SL, 1985, J CATAL, V94, P37
[10]   A KINETIC-STUDY OF PARTIAL OXIDATION OF METHANE WITH NITROUS-OXIDE ON A MOLYBDENA SILICA CATALYST [J].
KHAN, MM ;
SOMORJAI, GA .
JOURNAL OF CATALYSIS, 1985, 91 (02) :263-271