Acetone transformation into methyl isobutyl ketone over Pt/HMFI catalysts.: IV.: Effect of density and strength of the acidic sites

被引：31

作者：

Melo, L

Giannetto, G

Cardozo, L

Llanos, A

García, L

Magnoux, P

Guisnet, M

Alvarez, F

机构：

[1] Cent Univ Venezuela, Fac Ingn, Caracas 1041A, Venezuela

[2] Dept Quim, IUT Reg Capital, Caracas, Venezuela

[3] Univ Poitiers, Fac Sci, F-86022 Poitiers, France

[4] Inst Super Tecn, Lisbon, Portugal

来源：

CATALYSIS LETTERS | 1999年 / 60卷 / 04期

关键词：

acetone; MIBK; HZSM5; aluminosilicate; borosilicate; bifunctional catalyst; density and strength of acidic sites;

D O I：

10.1023/A:1019015325859

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：

Acetone transformation into methyl isobutyl ketone (MIBK) was studied using a fixed-bed dynamic reactor at 160 degrees C, 1 atm pressure and acetone/H-2 molar ratio=3. The reaction was carried out over Pt/HMFI bifunctional catalysts, with 0.30 wt% of platinum which was supported over three aluminosilicates (Si/Al ratio=40, 95 and 160) and a borosilicate (Si/B ratio=44) with similar dispersion. The results show that catalytic properties depend greatly on density and strength of the acidic sites of the catalysts. Moreover, the limiting step of the MIBK synthesis reaction (aldolization of two acetone molecules) is carried out over the acidic sites of the aluminosilicates, but not over those of the borosilicate, which considerably affects reaction selectivity.

引用

页码：217 / 222

页数：6