共 43 条
MULTICOMPONENT OXIDE CATALYSTS FOR THE OXIDATION OF METHANOL TO FORMALDEHYDE
被引:20
作者:
KLISSURSKI, D
[1
]
PESHEVA, Y
[1
]
ABADJIEVA, N
[1
]
MITOV, I
[1
]
FILKOVA, D
[1
]
PETROV, L
[1
]
机构:
[1] INST KINET & CATALYSIS, BU-1040 SOFIA, BULGARIA
来源:
APPLIED CATALYSIS
|
1991年
/
77卷
/
01期
关键词:
FORMALDEHYDE;
METHANOL OXIDATION;
MOLYBDATES;
PHOSPHORUS;
SELECTIVITY (FORMALDEHYDE);
THALLIUM;
D O I:
10.1016/0166-9834(91)80023-P
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:
The activity and selectivity of multicomponent oxide catalysts containing Co, Ni, Fe and Bi molybdates have been studied by a gradientless flow-circulation method. The unsupported (K1 and K2) and silica-supported (K3) catalysts, some of them promoted with phosphorus and thallium (K2 and K3) have been characterized by X-ray diffraction, infrared spectroscopy, Mossbauer spectroscopy, surface area and porous structure measurements. On the investigated catalysts the selectivity towards the oxidation of methanol to formaldehyde remains extremely high over a wide temperature interval (350-390-degrees-C). Significant difference in thermal stability of the catalysts during exploitation has been observed and attributed to the presence of a support and promoters. The relative change in principal kinetic parameters of Si-supported and P- and Tl-promoted catalyst (K3) and of the unsupported catalysts, but promoted with P and Tl (K2) was about 5-10% for 60 days, while with the unsupported catalyst without promoters (K1) the yield of formaldehyde decreased by about 30% during 80 h. The more stable activity of the catalyst K2 and K3 is associated also to some extent with the stabilizing role of the support and the promoters.
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页码:55 / 66
页数:12
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