Green and selective toluene oxidation–Knoevenagel-condensation domino reaction over Ce- and Bi-based CeBi mixed oxide mixtures

Research output: Contribution to journalArticle

Abstract

Both Bi- and Ce-based CeBi mixed oxides were prepared by a modified sol-gel process from their precursor salts. The mixed as well as the parent oxides were characterized by X-ray diffractometry, Raman, XPS, UV–DRS and X-ray photoelectron spectroscopies, ICP–OES method, scanning and transmission electron microscopies as well as BET surface area, CO2- and NH3-temperature-programmed desorption measurements. After characterizing the morphology, the acid-base properties, the oxidation states of the cationic components and the porosity of these structures, their catalytic activities were probed in the Koevenagel condensation of benzaldehyde and diethyl malonate and the toluene oxidation to benzaldehyde reactions. Based on the catalytic activities of the oxides in the individual reactions, a catalyst mixture from the Bi- and Ce-based mixed oxides was used successfully in the toluene to benzaldehyde oxidation and benzaldehyde to benzylidene malonate Knoevenagel condensation domino reaction under environmentally benign conditions.

Original languageEnglish
Pages (from-to)308-315
Number of pages8
JournalJournal of Catalysis
Volume381
DOIs
Publication statusPublished - Jan 2020

Fingerprint

Condensation reactions
Toluene
mixed oxides
Oxides
toluene
condensation
oxidation
catalytic activity
Oxidation
Catalyst activity
oxides
X ray photoelectron spectroscopy
sol-gel processes
x rays
Temperature programmed desorption
desorption
photoelectron spectroscopy
X ray diffraction analysis
Sol-gel process
salts

Keywords

  • CeBi-oxide solid solutions
  • Comprehensive structural characterization
  • Environmentally benign conditions
  • Knoevenagel condensation on the solid bases
  • Oxidation and Knoevenagel condensation domino reaction over the mixed CeBi oxides
  • Toluene oxidation on the Ce-centres

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this

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title = "Green and selective toluene oxidation–Knoevenagel-condensation domino reaction over Ce- and Bi-based CeBi mixed oxide mixtures",
abstract = "Both Bi- and Ce-based CeBi mixed oxides were prepared by a modified sol-gel process from their precursor salts. The mixed as well as the parent oxides were characterized by X-ray diffractometry, Raman, XPS, UV–DRS and X-ray photoelectron spectroscopies, ICP–OES method, scanning and transmission electron microscopies as well as BET surface area, CO2- and NH3-temperature-programmed desorption measurements. After characterizing the morphology, the acid-base properties, the oxidation states of the cationic components and the porosity of these structures, their catalytic activities were probed in the Koevenagel condensation of benzaldehyde and diethyl malonate and the toluene oxidation to benzaldehyde reactions. Based on the catalytic activities of the oxides in the individual reactions, a catalyst mixture from the Bi- and Ce-based mixed oxides was used successfully in the toluene to benzaldehyde oxidation and benzaldehyde to benzylidene malonate Knoevenagel condensation domino reaction under environmentally benign conditions.",
keywords = "CeBi-oxide solid solutions, Comprehensive structural characterization, Environmentally benign conditions, Knoevenagel condensation on the solid bases, Oxidation and Knoevenagel condensation domino reaction over the mixed CeBi oxides, Toluene oxidation on the Ce-centres",
author = "G{\'a}bor Varga and {\'A}kos Kukovecz and Zolt{\'a}n K{\'o}nya and P{\'a}l Sipos and Istv{\'a}n P{\'a}link{\'o}",
year = "2020",
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T1 - Green and selective toluene oxidation–Knoevenagel-condensation domino reaction over Ce- and Bi-based CeBi mixed oxide mixtures

AU - Varga, Gábor

AU - Kukovecz, Ákos

AU - Kónya, Zoltán

AU - Sipos, Pál

AU - Pálinkó, István

PY - 2020/1

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N2 - Both Bi- and Ce-based CeBi mixed oxides were prepared by a modified sol-gel process from their precursor salts. The mixed as well as the parent oxides were characterized by X-ray diffractometry, Raman, XPS, UV–DRS and X-ray photoelectron spectroscopies, ICP–OES method, scanning and transmission electron microscopies as well as BET surface area, CO2- and NH3-temperature-programmed desorption measurements. After characterizing the morphology, the acid-base properties, the oxidation states of the cationic components and the porosity of these structures, their catalytic activities were probed in the Koevenagel condensation of benzaldehyde and diethyl malonate and the toluene oxidation to benzaldehyde reactions. Based on the catalytic activities of the oxides in the individual reactions, a catalyst mixture from the Bi- and Ce-based mixed oxides was used successfully in the toluene to benzaldehyde oxidation and benzaldehyde to benzylidene malonate Knoevenagel condensation domino reaction under environmentally benign conditions.

AB - Both Bi- and Ce-based CeBi mixed oxides were prepared by a modified sol-gel process from their precursor salts. The mixed as well as the parent oxides were characterized by X-ray diffractometry, Raman, XPS, UV–DRS and X-ray photoelectron spectroscopies, ICP–OES method, scanning and transmission electron microscopies as well as BET surface area, CO2- and NH3-temperature-programmed desorption measurements. After characterizing the morphology, the acid-base properties, the oxidation states of the cationic components and the porosity of these structures, their catalytic activities were probed in the Koevenagel condensation of benzaldehyde and diethyl malonate and the toluene oxidation to benzaldehyde reactions. Based on the catalytic activities of the oxides in the individual reactions, a catalyst mixture from the Bi- and Ce-based mixed oxides was used successfully in the toluene to benzaldehyde oxidation and benzaldehyde to benzylidene malonate Knoevenagel condensation domino reaction under environmentally benign conditions.

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