News Column

New Findings in Applied Catalysis Research Described from Swiss Federal Institute of Technology (How to increase the selectivity of Pd-based catalyst...

July 11, 2014



New Findings in Applied Catalysis Research Described from Swiss Federal Institute of Technology (How to increase the selectivity of Pd-based catalyst in alkynol hydrogenation: Effect of second metal)

By a News Reporter-Staff News Editor at Science Letter -- Current study results on Applied Catalysis Research have been published. According to news reporting originating in Lausanne, Switzerland, by NewsRx journalists, research stated, "The development of selective Pd-based catalyst for semi-hydrogenation of dehydroisophytol (DIP), a C-20-alicynol, is reported. A series of unsupported mono- (Pd) and bimetallic (Pd-M) nanopartides (NPs) with Pd/M molar ratios of 1.5 - 5.0 (M=Ag or Cu) were examined as model systems."

The news reporters obtained a quote from the research from the Swiss Federal Institute of Technology, "The Pd-Ag and Pd-Cu NPs with controlled crystal sizes of similar to 3.3 nm were prepared by Ag (Cu) electroless deposition on pre-formed poly(N-vinyl-2-pyrrolidone)-stabilized Pd colloids. Bimetallic Pd-Ag NPs adopted a core (Pd)-shell (Ag) structure whereas a mixed alloy was attained in the Pd-Cu nanocrystals. A (partial) Pd surface segregation induced by reaction with H-2 was in evidence for the Pd-Ag NPs. A significant increase in selectivity up to 97% (at X-DIP = 99%) to the target alkenol was demonstrated following the incorporation of a second metal. This result is attributed to the dilution of the surface Pd-sites by Ag (Cu) and a modification of the Pd electronic properties. Pd-Ag NPs, having shown the highest selectivity, were further deposited on a structured support based on sintered metal fibers (SMF) coated with ZnO. The improved selectivity achieved over the unsupported Pd-Ag colloidal NPs was retained over the structured catalytic system."

According to the news reporters, the research concluded: "The bimetallic Pd(5.0)AganO/SMF (S-IP = 93%) demonstrated a drastic increase in IP selectivity relative to the monometallic Pd/ZnO/SMF (S-IP = 78%) and state-of-the-art Lindlar catalyst (S-IP = 62%) at DIP conversion >= 99% with the stable activity during 50 h, suggesting catalyst feasibility for selective semi-hydrogenation of long chain alkynols with important applications in the manufacture of vitamins and fine chemicals."

For more information on this research see: How to increase the selectivity of Pd-based catalyst in alkynol hydrogenation: Effect of second metal. Applied Catalysis A-General, 2014;478():186-193. Applied Catalysis A-General can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands (see also Applied Catalysis Research).

Our news correspondents report that additional information may be obtained by contacting A. Yarulin, Ecole Polytechnic Fed Lausanne, EPFL SB CIME, Interdisciplinary Center Electron Microscopy CIME, CH-1015 Lausanne, Switzerland. Additional authors for this research include I. Yuranov, F. Cardenas-Lizana, D.T.L. Alexander and L. Kiwi-Minsker.

Keywords for this news article include: Europe, Lausanne, Switzerland, Applied Catalysis Research

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Science Letter


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters