DEACTIVATION OF CU/ZNO CATALYST DURING DEHYDROGENATION OF METHANOL

Authors
JUNG, KDJoo, OSHAN, SHUhm, SJCHUNG, IJ
Issue Date
1995-01
Publisher
BALTZER SCI PUBL BV
Citation
CATALYSIS LETTERS, v.35, no.3-4, pp.303 - 311
Abstract
The deactivation of Cu/ZnO catalyst during methanol dehydrogenation to form methyl formate has been studied. The Cu/ZnO catalyst was seriously deactivated under the reaction conditions: various temperatures of 493, 523 and 553 K, atmospheric pressure and methanol GHSV of 3000 mi (STP)/g-cat h. The weight loss due to reduction of ZnO in the Cu/ZnO catalyst was monitored by a microbalance. X-ray induced Auger spectroscopy of Zn(L(3)M(4,5)M(4,5)) showed the increase in the concentration of metallic Zn on the catalyst surface after the reaction. Temperature-programmed reduction (TPR) of the Cu/ZnO catalyst with methanol demonstrated that the reduction of ZnO in Cu/ZnO was suppressed by introduction of CO2 into the stream of helium-methanol. As the concentration of CO2 in the feed gas increased, the weight loss of the Cu/ZnO catalyst due to the reduction of ZnO decreased. The deactivation of the Cu/ZnO catalyst in the methanol dehydrogenation was also retarded by the addition of CO2. In particular, oxygen injection into the reactant feed regenerated the Cu/ZnO catalyst deactivated during the reaction. Based on these observations, the cause of deactivation of the Cu/ZnO catalyst has been discussed.
Keywords
COPPER-BASED CATALYSTS; METHYL FORMATE; MECHANISM; ZNO; SURFACES; OXIDE; COPPER-BASED CATALYSTS; METHYL FORMATE; MECHANISM; ZNO; SURFACES; OXIDE; METHANOL DEHYDROGENATION; DEACTIVATION OF CU/ZNO CATALYST; REDUCTION OF ZNO; OXIDANT EFFECT; REGENERATION OF DEACTIVATED CATALYST
ISSN
1011-372X
URI
https://pubs.kist.re.kr/handle/201004/145422
DOI
10.1007/BF00807187
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KIST Article > Others
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