Published 2012 | Version v1
Journal article Metadata-only

Impregnation of 12-tungstophosphoric acid on silica - part I: determination of impregnation parameters, characterization and evaluation of catalytic activity

Creators

  • 1. Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Engenharia Quimica
  • 2. Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Quimica

Description

Catalyst based on Kegging-type heteropolyacids (H3PW12O40 - HPA), supported on SiO2 (H3PW), were prepared by the impregnation method under different thermal treatment conditions. The materials were characterized by different instrumental techniques and used as catalysts in the methyl esterification reactions of stearic acid. Using the catalyst with 15% of HPA, conversions higher than 60% were obtained after 2 h of reaction at 65 deg C. Recovery studies using hot-filtration with ethanol at 75 deg C showed satisfactory activity for two additional reaction cycles. (author)

Availability note (English)

Available from http://www.scielo.br/pdf/qn/v35n7/v35n7a11.pdf

Additional details

Additional titles

Original title (Portuguese)
Impregnacao do acido 12-fosfotungstico em silica - parte I: determinacao de parametros de impregnacao, caracterizacao e avaliacao da atividade catalitica

Identifiers

URL
http://www.scielo.br/pdf/qn/v35n7/v35n7a11.pdf;

Publishing Information

Journal Title
Quimica Nova
Journal Volume
35
Journal Issue
7
Journal Page Range
p. 1343-1347
ISSN
0100-4042

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
43099667
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
CALCINATION; CATALYSTS; ESTERIFICATION; ETHANOL; FLUORESCENCE SPECTROSCOPY; GAS CHROMATOGRAPHY; LEACHING; METHANOL; OCTADECANOIC ACID; SILICA; SILICON OXIDES; TEMPERATURE DEPENDENCE; TUNGSTEN; TUNGSTEN OXIDES; ULTRAVIOLET SPECTRA; X-RAY DIFFRACTION
Descriptors DEC
ALCOHOLS; CARBOXYLIC ACIDS; CHALCOGENIDES; CHEMICAL REACTIONS; CHROMATOGRAPHY; COHERENT SCATTERING; DECOMPOSITION; DIFFRACTION; DISSOLUTION; ELEMENTS; EMISSION SPECTROSCOPY; HYDROXY COMPOUNDS; METALS; MINERALS; MONOCARBOXYLIC ACIDS; ORGANIC ACIDS; ORGANIC COMPOUNDS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PYROLYSIS; REFRACTORY METAL COMPOUNDS; REFRACTORY METALS; SCATTERING; SEPARATION PROCESSES; SILICON COMPOUNDS; SPECTRA; SPECTROSCOPY; THERMOCHEMICAL PROCESSES; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; TUNGSTEN COMPOUNDS