Number of the records: 1
Zeolite MCM-22 Modified with Au and Cu for Catalytic Total Oxidation of Methanol and Carbon Monoxide
- 1.
SYSNO ASEP 0422064 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Zeolite MCM-22 Modified with Au and Cu for Catalytic Total Oxidation of Methanol and Carbon Monoxide Author(s) Kaminski, P. (PL)
Sobczak, I. (PL)
Decyk, P. (PL)
Ziolek, M. (PL)
Roth, Wieslaw Jerzy (UFCH-W)
Campo, B. (FR)
Daturi, M. (FR)Source Title Journal of Physical Chemistry C. - : American Chemical Society - ISSN 1932-7447
Roč. 117, č. 5 (2013), s. 2147-2159Number of pages 13 s. Language eng - English Country US - United States Keywords adsorption ; carbon dioxide ; MCM-22 zeolites Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GAP106/12/0189 GA ČR - Czech Science Foundation (CSF) Institutional support UFCH-W - RVO:61388955 UT WOS 000314907700019 EID SCOPUS 84873463773 DOI 10.1021/jp310505y Annotation The goal of this work was to use MCM-22 zeolites for preparation of monometallic (Cu or Au) and bimetallic (Cu and Au) catalysts for oxidation reactions. The focus was on precise determination of the nature of gold and copper species and their activity in the oxidation processes. For that purpose several characterization techniques were applied (XRD, N2 adsorption/desorption, TEM, SEM, UV-vis, H2-TPR, 27Al MAS NMR, FT-IR with the adsorption of pyridine, NO, and CO, ESR spectroscopy). They allowed us to define the following species formed on MCM-22 surface: metallic gold particles (XRD, UV-vis), isolated Cu2+ with octahedral coordination (UV-vis, ESR), square planar Cu2+ cations (ESR, IR), Cu+ species (ESR+NO, FTIR+CO, and FTIR+NO), and oligonuclear clusters (UV-vis) as well as CuO-like species (H2-TPR). The presence of gold on the MCM-22 surface modified further by copper species caused the interaction between two modifiers leading to much easier reduction of CuO-like species and higher mobility of oxygen-promoting oxidative properties. The bimetallic catalyst was highly active in total oxidation of methanol and CO in the temperature range 523-623 K. Cu/Au-MCM-22 zeolite appeared useful for simultaneous removal of CO and methanol (by total oxidation) from gases emitted from automotive devices and during a variety of industrial process operations. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2014
Number of the records: 1