Study of the Alkylation of Phenol with Methanol on Zn(H)-Exchanged NaY Zeolites

被引：26

作者：

Gonzalez Pena, L. F. ^{[1
]}

Sad, M. E. ^{[1
]}

Padro, C. L. ^{[1
]}

Apesteguia, C. R. ^{[1
]}

机构：

[1] UNL CONICET, Catalysis Sci & Engn Res Grp GICIC, INCAPE, RA-3000 Santa Fe, Argentina

来源：

CATALYSIS LETTERS | 2011年 / 141卷 / 07期

关键词：

Phenol methylation; Zeolites Zn(x)NaY; Zeolites Na(x)HY; Alkylation reactions; Zeolite NaY; ACID SITES; P-CRESOL; NAFION-H; ANISOLE; METHYLATION; FRAMEWORK; MECHANISM; ALUMINUM; SILICA;

D O I：

10.1007/s10562-011-0640-0

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 gas-phase alkylation of phenol with methanol was studied at 473 K on zeolite NaY exchanged with Zn+2 (samples Zn(x)NaY) or H+ (samples Na(x)HY) cations. Zeolite NaY contained only weak and medium Lewis acid sites. The addition of Zn+2 formed essentially strong Lewis acid sites. In contrast, the exchange of NaY with H+ generated Bronsted acid sites and decreased the density of Lewis acid sites. Zeolite NaY was inactive at 473 K, but after its exchange with Zn2+ efficiently promoted the phenol methylation reaction. Phenol conversion and the selectivities to o- and p-cresols increased with the Zn content in the sample. The exchange of Na+ with H+ also activated the parent NaY zeolite. At similar phenol conversion levels, Na(x)HY samples formed more anisole and less cresols than Zn(x)NaY. All the Zn(x)NaY and Na(x)HY samples deactivated on stream, but the catalyst activity decay increased with the exchange degree.

引用

页码：939 / 947

页数：9

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