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Impregnation of 12-tungstophosphoric acid on silica - part II: effect of different solvents on the impregnation and catalytic activity in methyl esterification of stearic acid; Impregnacao do acido 12-tungstofosforico em silica - parte II: efeito de diferentes solventes na impregnacao e atividade catalitica na esterificacao metilica de acido estearico

Abstract

Materials obtained by the immobilization of 12-tungstophosphoric acid (PTA) on silica using the method of impregnation with excess solution in distinct solvents (aqueous HCl, methanol:H{sub 2}O, and acetonitrile) were evaluated for use as catalysts in the methyl esterification of stearic acid. Optimum conditions were established for the impregnation of 0.5 g (w/w) of PTA on amorphous silica, under stirring at 150 rpm for 24 h, using 20 mL of 0.1 mol L{sup -1} HCl as the solvent. After calcination at 200 deg C, high conversions were obtained under mild reaction conditions, resulting in high turnover numbers. The catalyst was evaluated in ten catalytic cycles of use, where the activity was reduced only slightly, attesting its stability and the possibility to apply it to industrial production of methylesters. (author)
Authors:
Scroccaro, Karine Isabel; Yamamoto, Carlos I., E-mail: karineisabel@yahoo.com.br; [1]  Tanobe, Valcineide O. de A.; Oliveira, Alan Antonio de; [2]  Wypych, Fernando [3] 
  1. Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Centro Politecnico. Departamento de Engenharia Quimica
  2. Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Departamento de Engenharia e Tecnologia Florestal
  3. Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Departamento de Quimica
Publication Date:
Apr 15, 2014
Product Type:
Journal Article
Resource Relation:
Journal Name: Quimica Nova; Journal Volume: 37; Journal Issue: 2
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACETONITRILE; CALCINATION; CATALYSTS; ESTERIFICATION; GAS CHROMATOGRAPHY; OCTADECANOIC ACID; PHOSPHORIC ACID; SILICA; TUNGSTEN; HOSPHORIC
OSTI ID:
22258988
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
Journal ID: ISSN 0100-4042; TRN: BR14V1237080202
Availability:
Available from http://www.scielo.br/pdf/qn/v37n2/v37n2a07.pdf
Submitting Site:
BRN
Size:
page(s) 232-237
Announcement Date:
Aug 30, 2014

Citation Formats

Scroccaro, Karine Isabel, Yamamoto, Carlos I., E-mail: karineisabel@yahoo.com.br, Tanobe, Valcineide O. de A., Oliveira, Alan Antonio de, and Wypych, Fernando. Impregnation of 12-tungstophosphoric acid on silica - part II: effect of different solvents on the impregnation and catalytic activity in methyl esterification of stearic acid; Impregnacao do acido 12-tungstofosforico em silica - parte II: efeito de diferentes solventes na impregnacao e atividade catalitica na esterificacao metilica de acido estearico. Brazil: N. p., 2014. Web.
Scroccaro, Karine Isabel, Yamamoto, Carlos I., E-mail: karineisabel@yahoo.com.br, Tanobe, Valcineide O. de A., Oliveira, Alan Antonio de, & Wypych, Fernando. Impregnation of 12-tungstophosphoric acid on silica - part II: effect of different solvents on the impregnation and catalytic activity in methyl esterification of stearic acid; Impregnacao do acido 12-tungstofosforico em silica - parte II: efeito de diferentes solventes na impregnacao e atividade catalitica na esterificacao metilica de acido estearico. Brazil.
Scroccaro, Karine Isabel, Yamamoto, Carlos I., E-mail: karineisabel@yahoo.com.br, Tanobe, Valcineide O. de A., Oliveira, Alan Antonio de, and Wypych, Fernando. 2014. "Impregnation of 12-tungstophosphoric acid on silica - part II: effect of different solvents on the impregnation and catalytic activity in methyl esterification of stearic acid; Impregnacao do acido 12-tungstofosforico em silica - parte II: efeito de diferentes solventes na impregnacao e atividade catalitica na esterificacao metilica de acido estearico." Brazil.
@misc{etde_22258988,
title = {Impregnation of 12-tungstophosphoric acid on silica - part II: effect of different solvents on the impregnation and catalytic activity in methyl esterification of stearic acid; Impregnacao do acido 12-tungstofosforico em silica - parte II: efeito de diferentes solventes na impregnacao e atividade catalitica na esterificacao metilica de acido estearico}
author = {Scroccaro, Karine Isabel, Yamamoto, Carlos I., E-mail: karineisabel@yahoo.com.br, Tanobe, Valcineide O. de A., Oliveira, Alan Antonio de, and Wypych, Fernando}
abstractNote = {Materials obtained by the immobilization of 12-tungstophosphoric acid (PTA) on silica using the method of impregnation with excess solution in distinct solvents (aqueous HCl, methanol:H{sub 2}O, and acetonitrile) were evaluated for use as catalysts in the methyl esterification of stearic acid. Optimum conditions were established for the impregnation of 0.5 g (w/w) of PTA on amorphous silica, under stirring at 150 rpm for 24 h, using 20 mL of 0.1 mol L{sup -1} HCl as the solvent. After calcination at 200 deg C, high conversions were obtained under mild reaction conditions, resulting in high turnover numbers. The catalyst was evaluated in ten catalytic cycles of use, where the activity was reduced only slightly, attesting its stability and the possibility to apply it to industrial production of methylesters. (author)}
journal = {Quimica Nova}
issue = {2}
volume = {37}
journal type = {AC}
place = {Brazil}
year = {2014}
month = {Apr}
}