Preparation of Phosphotungstic acid/ silica supported catalyst for esterification reaction

Name: Satit Phiyanalinmat

Organization : Chiang Mai University. Faculty of Science

Email : satit.phi@cmu.ac.th

Name: Jutamad Takaew

Organization : Chiang Mai University.. Center of Excellence in Materials Science and Technology

keyword: Esterification catalyst

LCSH: Esterification

; Heteropoly acid

LCSH: Silica

Abstract: This research aimed to prepare phosphotungstic acid (H3PW12O40, PTA) catalyst supported on silica for esterification. Firstly, PTA was synthesized from the precipitation between WO42- and Na2HPO4 with adjusting pH by HCl solution. The PTA/SiO2 supported catalysts were prepared by spray impregnation. Various factors to examine the conversion of acetic acid, there were 2 percent PTA/SiO2, 5 percent PTA/SiO2, 10 percent PTA/SiO2. All catalysts had been characterized by particle size analyzer, N2 adsorption, SEM-EDS, XRD and Hammett indicator, consecutively. Applying 60 Celsius degrees, 120 min. for all reactions, the reactant mixture was equimolar of acetic acid: ethanol. Using 1 g 10 percent PTA/SiO2 catalyst, it gave the highest conversion equal to 9.5 percent conversion among PTA/SiO2 supported catalysts. Compared to 1 g PTA unsupported one, it had conversion of 23.4 percent. After analysis of reacted acetic acid per active site as turnover number (TON), it indicated that 10 percent PTA/SiO2 catalyst had TON = 2.25x105 while PTA with TON = 1.92x104 and it showed 11.7 times higher than PTA unsupported one. This contributed on PTA deposition as W species on SiO2 support. Additionally, the SiO2 support also suppressed the active sites of PTA dissolution. The PTA/SiO2 supported catalyst and the unsupported one had pH 4.2 and pH 3.0, respectively. This method achieved to prepare PTA supported catalyst and to catalyze esterification

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2020

Modified: 2021-05-05

Issued: 2021-04-23

บทความ/Article

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BibliograpyCitation : In Thai Institute of Chemical Engineering and Applied Chemistry. The 29th Thai Institute of Chemical Engineering and Applied Chemistry Conference (TiChE 2020) (p.282-292). Bangkok : Chulalongkorn University

eng

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