OXIDATIVE DEHYDROGENATION OF ISOBUTYRALDEHYDE TO METHACROLEIN OVER IRON PHOSPHATE CATALYST

被引:24
作者
MUNEYAMA, E
KUNISHIGE, A
OHDAN, K
AI, M
机构
[1] TOKYO INST TECHNOL,RESOURCES UTILIZAT RES LAB,4259 NAGATSUTA,MIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN
[2] UBE SCI ANAL LAB INC,UBE 755,JAPAN
[3] UBE IND LTD,UBE LAB,UBE 755,JAPAN
来源
JOURNAL OF MOLECULAR CATALYSIS | 1994年 / 89卷 / 03期
关键词
DEHYDROGENATION; ISOBUTYRALDEHYDE; METHACROLEIN; IRON; OXIDATION; PHOSPHATE;
D O I
10.1016/0304-5102(93)E0332-B
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 oxidative dehydrogenation of isobutyraldehyde was studied at 400-degrees-C in the presence of a large amount of steam using an iron phosphate with a P/Fe atomic ratio of 1.2 as the catalyst. The main products were methacrolein, CO, and CO2; methacrylic acid was not formed from isobutyraldehyde unlike the case of the reaction over heteropoly compound catalysts. Even in the absence of catalyst, large amounts of isobutyraldehyde were consumed, although the conversion of isobutyraldehyde increased as the contact time increased. With an oxygen/isobutyraldehyde molar ratio of 0.9, the yield of methacrolein reached 68 mol% with a conversion of 88% (nominal selectivity to methacrolein of 77 mol%). The true selectivity to methacrolein on the catalyst was estimated to be 90 mol%. It was found that the fresh catalyst consisting of only Fe3+ ions was reduced to iron(II) pyrophosphate via an unidentified intermediate phase during the reaction. The effects of oxygen and water on the catalytic behavior and the structures of catalyst were studied.
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页码:371 / 381
页数:11
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