CATALYTIC PROPERTIES OF HYDRATED TANTALUM OXIDE

被引：51

作者：

USHIKUBO, T

WADA, K

机构：

[1] Research Center, Mitsubishi Kasei Corporation, 1000 Kamoshida-chou, Midori-ku

来源：

APPLIED CATALYSIS | 1990年 / 67卷 / 01期

关键词：

TANTALUM OXIDE; ACIDITY; METHACRYLIC ACID ESTERIFICATION; BENZENE ALKYLATION; BUTENE ISOMERIZATION; ALDOL CONDENSATION; ISOBUTENE HYDRATION; SUPERACID; SELECTIVITY (METHYL METHACRYLATE); SOLID ACID;

D O I：

10.1016/S0166-9834(00)84429-2

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 hydrated tantalum and niobium oxides display strong acid properties in their amorphous form. The H0 value of these hydrated oxides was less than - 8.2. The acid property of the hydrated tantalum oxide was maintained to higher temperatures than that of the hydrated niobium oxide. The hydrated tantalum oxide catalyzed not only some gas-phase reactions, including the esterification of methacrylic acid with methanol, the alkylation of benzene with ethene, and the isomerization of 1-butene, but also some liquid-phase reactions, such as the aldol condensation of acetone and the hydration of isobutene. The hydrated tantalum oxide showed mainly Lewis acidity in the absence of water. Bronsted acidity was regenerated by steam treatment, confirmed by infrared spectroscopy and the isomerization of 1-butene. The hydrated tantalum oxide was activated to a solid superacid by treatment with sulfuric acid.

引用

页码：25 / 38

页数：14

共 12 条

[1] THE NATURE OF ACTIVE-SITES IN THE ISOMERIZATION OF 1-HEXENE ON CRACKING CATALYSTS [J].