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.

引用

页码：55 / 66

页数：12

共 43 条

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