Access the full text.
Sign up today, get DeepDyve free for 14 days.
W. Choi, J. Kim, Tae Lee, S. Woo (2000)
Balancing acidity and basicity for highly selective and stable modified MgO catalysts in the alkylation of phenol with methanolCatalysis Today, 63
C. Kienle, C. Schinzer, J. Lentmaier, O. Schaal, S. Kemmler‐sack (1997)
Composites between spinels and binary oxides and their selective catalytic reduction activityMaterials Chemistry and Physics, 49
G. Fierro, M. Jacono, M. Inversi, P. Porta, F. Cioci, R. Lavecchia (1996)
Study of the reducibility of copper in CuOZnO catalysts by temperature-programmed reductionApplied Catalysis A-general, 137
A. Kiennemann, H. Idriss, J. Hindermann, J. Lavalley, A. Vallet, P. Chaumette, P. Courty (1990)
Methanol synthesis on Cu/ZnAl2O4 and Cu/ZnOAl2O3 Catalysts: Influence of carbon monoxide pretreatment on the formation and concentration of formate speciesApplied Catalysis, 59
H. Grabowska, W. Mista, J. Trawczyński, J. Wrzyszcz, M. Zawadzki (2001)
A method for obtaining thymol by gas phase catalytic alkylation of m-cresol over zinc aluminate spinelApplied Catalysis A-general, 220
T. Jyothi, S. Sugunan, K. Sreekumar, M. Talawar, B. Rao (2000)
Effect of sulphate treatment in the alkylation of phenol with methanol over mixed oxides of tin with lanthanum and samariumIndian Journal of Chemical Technology, 7
Tan-feng Tsai, Fey-long Wang (2001)
Ortho-alkylation of phenol derivatives with methanol over magnesium oxide catalysts. 1. Characterization of promoted magnesium oxide catalystsCatalysis Letters, 73
H. Grabowska, W. Mis´ta, J. Trawczyn´ski, J. Wrzyszcz, M. Zawadzki (2001)
Catalytic alkylation of phenol with methanol over zinc aluminateResearch on Chemical Intermediates, 27
V. Rao, V. Kumari, S. Narayanan (1989)
Selective alkylation of phenol to 2,6-xylenol over vanadia—chromia mixed oxide catalystsApplied Catalysis, 49
S. Sato, K. Koizumi, F. Nozaki (1998)
Ortho-Selective Methylation of Phenol Catalyzed by CeO2-MgO Prepared by Citrate ProcessJournal of Catalysis, 178
M. Marion, E. Garbowski, M. Primet (1991)
Catalytic properties of copper oxide supported on zinc aluminate in methane combustionJournal of the Chemical Society, Faraday Transactions, 87
M. Landau, S. Kogan, D. Tavor, M. Herskowitz, J. Koresh (1997)
Selectivity in heterogeneous catalytic processesCatalysis Today, 36
S. Velu, C. Swamy (1996)
Selective C-alkylation of phenol with methanol over catalysts derived from copper-aluminium hydrotalcite-like compoundsApplied Catalysis A-general, 145
S. Velu, C. Swamy (2000)
Selective Ortho alkylation of phenol with alcohols over catalysts derived from hydrotalcite-like anionic claysResearch on Chemical Intermediates, 26
W. Shaheen (2002)
Thermal solid–solid interaction and catalytic properties of CuO/Al2O3 system treated with ZnO and MoO3Thermochimica Acta, 385
J. Wrzyszcz, M. Zawadzki, J. Trawczyński, H. Grabowska, W. Mista (2001)
Some catalytic properties of hydrothermally synthesised zinc aluminate spinelApplied Catalysis A-general, 210
C. Chauvin, J. Saussey, J. Lavalley, H. Idriss, J. Hindermann, A. Kiennemann, P. Chaumette, P. Courty (1990)
Combined infrared spectroscopy, chemical trapping, and thermoprogrammed desorption studies of methanol adsorption and decomposition on ZnAl2O4 and Cu/ZnAl2O4 catalystsJournal of Catalysis, 121
J. Wrzyszcz (2001)
Synthesis and Properties of Zinc Aluminate CatalystPolish Journal of Chemistry, 75
J. Cosimo, M. Gines, E. Iglesia (2000)
Structural requirements and reaction pathways in condensation reactions of alcohols on MgyAlOx catalystsJournal of Catalysis, 190
S. Lee, Siyeo Lee, Ki Kim, T. Lee, Dong-Hyun Kim, J. Kim (1998)
O-alkylation of phenol derivatives over basic zeolitesCatalysis Today, 44
J. Cosimo, V. Díez, Mingting Xu, E. Iglesia, C. Apesteguía (1998)
Structure and Surface and Catalytic Properties of Mg-Al Basic OxidesJournal of Catalysis, 178
The effect of heat-treatment on 10 wt% CuO-ZnAl2O4 catalytic activity in methylation of phenol and the degree of interaction of CuO active phase with support spinel phase were investigated. The CuO-ZnAl2O4 sample was subjected to heat-treatment up to 1000°C. The thermal products were characterized by X-ray diffraction (XRD) analysis, nitrogen adsorption-desorption at -196°C and temperature-programmed desorption (TPD-MS) of CO2. Additionally, the reducibility of copper phases was investigated by temperature-programmed reduction (TPR). XRD patterns of the fresh catalyst sample (calcined at 600°C) indicated the presence of a mixture of poorly crystallized CuO and ZnAl2O4 spinel phase. The presence of two reducible copper species has been found on fresh CuO-ZnAl2O4 catalyst by TPR analysis. After subsequent calcinations in air at elevated temperatures some CuO disappeared with appearance of CuAl2O4 phase. The catalytic results revealed that the CuO addition to ZnAl2O4 increases the activity in ortho-methylation of phenol. Subsequent heat-treatment up to 900°C causes partial deactivation of copper centers, which is the result of transformation of CuO to the inactive CuAl2O4 phase.
Research on Chemical Intermediates – Springer Journals
Published: Oct 17, 2004
Access the full text.
Sign up today, get DeepDyve free for 14 days.