Zeolite MCM-22 modified with Au and Cu for catalytic total oxidation of methanol and carbon monoxide

doi:10.1021/jp310505y

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punktacja MNiSW [2013 A]: 35

tytuł	Zeolite MCM-22 modified with Au and Cu for catalytic total oxidation of methanol and carbon monoxide
autor	Sobczak Izabela, Decyk Piotr, Ziółek Maria, Roth Wiesław J. , Campo Betiana, Daturi Marco, Kamiński Piotr
tytuł czasopisma	The Journal of Physical Chemistry. C
tom	117
numer	5
data wydania	2013
strony	2147-2159
ISSN	1932-7447
eISSN	1932-7455
DOI	10.1021/jp310505y
język	angielski
język czasopisma	angielski
abstrakt w j. angielskim	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, N 2 adsorption/desorption, TEM, SEM, UV − vis, H 2 -TPR, 27 Al MAS NMR, FT-IR with the adsorption of pyridine, NO, and CO, ESR spectroscopy). They allowed us to de fi ne the following species formed on MCM-22 surface: metallic gold particles (XRD, UV − vis), isolated Cu 2+ with octahedral coordination (UV − vis, ESR), square planar Cu 2+ cations (ESR, IR), Cu + species (ESR+NO, FTIR+CO, and FTIR+NO), and oligonuclear clusters (UV − vis) as well as CuO-like species (H 2 -TPR). The presence of gold on the MCM-22 surface modi fi ed further by copper species caused the interaction between two modi fi ers 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.
wydział:instytut/zakład/katedra	Wydział Chemii : Zakład Chemii Nieorganicznej
typ	artykuł w czasopiśmie
podtyp	artykuł