Both metallocene and Phillips chromium catalysts are used in the commercial manufacture of polyethylene. Unlike most other systems, Chevron Chemical (CPC) platform does not use methylaluminoxane or fluoroorganic boranes. Instead, support itself serves to activate (ionize) metallocenes, which then polymerize ethylene at high activity. Most these solid acid supports can also be anchor Cr make a c...

SBA-15 is an interesting mesoporous silica material having highly ordered nanopores and a large surface area, which is widely employed as catalyst supports, absorbents, drug delivery materials, etc. Since it has a lack of functionality, heteroatoms and organic functional groups have been incorporated by direct or post-synthesis methods in order to modify their functionality. The aim of this art...

In this study, TiO2 nanotubes (TNTs) were synthesized via a hydrothermal method using highly concentrated NaOH solutions varying from 6 to 12 M at 180 °C for 48 h. The effects of the NaOH concentration and the TNT crystal structure on the performance for methanol oxidation were investigated to determine the best catalyst support for Pt-based catalysts. The results showed that TNTs produced with...

γ-Valerolactone (GVL) has been identified as a sustainable platform chemical for the production of carbon-based chemicals. Here we report a screening study on the hydrogenation of levulinic acid (LA) to GVL in water using a wide range of ruthenium supported catalysts in a batch set-up (1 wt. % Ru, 90 ◦C, 45 bar of H2, 2 wt. % catalyst on LA). Eight monometallic catalysts were tested on carbon b...

SINGLE-WALLED CARBON NANOTUBE BUCKYPAPERS AS ELECTROCATALYST SUPPORTS FOR METHANOL OXIDATION J.M. Sieben, A. Ansón-Casaos, M.T. Martínez, E. Morallón a Departamento de Química Física and Instituto Universitario de Materiales, Universidad de Alicante, Ap. 99 Alicante, Spain. b Instituto de Carboquímica, CSIC, Miguel Luesma 4, 50018 Zaragoza, Spain. Abstract This work studies the use of various s...

Immobilized and stabilized lipases are important biocatalytic tools. In this paper, different tailor-made bifunctional supports were prepared for the immobilization of a new metagenomic lipase (LipC12). The new supports contained hydrophobic groups (different alkyl groups) to promote interfacial adsorption of the lipase and aldehyde groups to react covalently with the amino groups of side chain...

Four silica samples were evaluated as supports in the hydroformylation of oct-1-ene by Supported Aqueous Phase Catalysis (SAPC) using [Rh2(μ-SBu)2(CO)2(TPPTS)2] and [Rh(COD)Cl]2/TPPTS as catalysts. Adsorption studies of the [Rh(COD)Cl]2/TPPTS complex from aqueous solutions on the supports were carried out at 25 °C. The isotherms obtained were correlated by several models, among which the Fowler...

Corrosion of carbonaceous catalyst support materials such as carbon black has been known for conventional Pt/C catalysts, which is recognized as one of the cause of catalyst degradation [1]. To improve the durability of cathode catalyst, especially at high potentials during startstop periods, a more oxidation-resistant catalyst support at high potentials (>1.0 V) is desired for automotive and r...

12 The activities of copper oxide supported on mesoporous alumina and manganese oxide 13 have been investigated for nitric oxide (NO) reduction using carbon monoxide (CO) as 14 reducing agent. The results showed that catalytic activity is strongly influenced by the 15 properties of supports. CuO supported on manganese oxide was found to be a more 16 active catalyst for the NO reduction as compa...

Recent advances in the synthesis and characterization of small, essentially molecular metal complexes and metal clusters on support surfaces have brought new insights to catalysis and point the way to systematic catalyst design. We summarize recent work unraveling effects of key design variables of site-isolated catalysts: the metal, metal nuclearity, support, and other ligands on the metals, a...