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

doi:10.1021/jp310505y

Zeolite MCM-22 modified with Au and Cu for catalytic ...

Bibliographic description

punktacja MNiSW [2013 A]: 35

title:	Zeolite MCM-22 modified with Au and Cu for catalytic total oxidation of methanol and carbon monoxide
author:	Sobczak Izabela, Decyk Piotr, Ziółek Maria, Roth Wiesław , Campo Betiana, Daturi Marco, Kamiński Piotr
Journal title:	The Journal of Physical Chemistry. C
volume:	117
issue:	5
date of publication:	2013
pages:	2147-2159
ISSN:	1932-7447
eISSN:	1932-7455
DOI:	10.1021/jp310505y
language:	English
Journal language:	English
abstract in english:	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.
affiliation:	Wydział Chemii : Zakład Chemii Nieorganicznej
type:	journal article
subtype:	academic paper