Molecules 2011, 16(1), 38-51; doi:10.3390/molecules16010038
Article

Enhancement in the Catalytic Activity of Pd/USY in the Heck Reaction Induced by H2 Bubbling

* email, , ,  and
Received: 17 November 2010; in revised form: 13 December 2010 / Accepted: 24 December 2010 / Published: 24 December 2010
(This article belongs to the Special Issue Cross-Coupling Reactions in Organic Synthesis)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Pd was loaded on ultra stable Y (USY) zeolites prepared by steaming NH4-Y zeolite under different conditions. Heck reactions were carried out over the prepared Pd/USY. We found that H2 bubbling was effective in improving not only the catalytic activity of Pd/USY, but also that of other supported Pd catalysts and Pd(OAc)2. Moreover, the catalytic activity of Pd/USY could be optimized by choosing appropriate steaming conditions for the preparation of the USY zeolites; Pd loaded on USY prepared at 873 K with 100% H2O gave the highest activity (TOF = 61,000 h−1), which was higher than that of Pd loaded on other kinds of supports. The prepared Pd/USY catalysts were applicable to the Heck reactions using various kinds of substrates including bromo- and chloro-substituted aromatic and heteroaromatic compounds. Characterization of the acid properties of the USY zeolites revealed that the strong acid site (OHstrong) generated as a result of steaming had a profound effect on the catalytic activity of Pd.
Keywords: Heck coupling reaction; USY zeolite; palladium; H2 bubbling; acid property
PDF Full-text Download PDF Full-Text [756 KB, uploaded 18 June 2014 19:35 CEST]

Export to BibTeX |
EndNote


MDPI and ACS Style

Okumura, K.; Tomiyama, T.; Moriyama, S.; Nakamichi, A.; Niwa, M. Enhancement in the Catalytic Activity of Pd/USY in the Heck Reaction Induced by H2 Bubbling. Molecules 2011, 16, 38-51.

AMA Style

Okumura K, Tomiyama T, Moriyama S, Nakamichi A, Niwa M. Enhancement in the Catalytic Activity of Pd/USY in the Heck Reaction Induced by H2 Bubbling. Molecules. 2011; 16(1):38-51.

Chicago/Turabian Style

Okumura, Kazu; Tomiyama, Takuya; Moriyama, Sayaka; Nakamichi, Ayaka; Niwa, Miki. 2011. "Enhancement in the Catalytic Activity of Pd/USY in the Heck Reaction Induced by H2 Bubbling." Molecules 16, no. 1: 38-51.

Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert