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Journal : Indonesian Journal of Fundamental and Applied Chemistry

Thermal Stability and Acidity of Silica Supported Keggin Type Polyoxometalate K4[-SiW12O40]•nH2O Me, Welinda; Mohadi, Risfidian; Lesbani, Aldes
Indonesian Journal of Fundamental and Applied Chemistry Vol 1, No 1 (2016): February 2016
Publisher : Indonesian Journal of Fundamental and Applied Chemistry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v1.i1.24

Abstract

Silica supported polyoxometalate K4[a-SiW12O40]·nH2O was prepared systematically using tetraethyl ortho silicate by sol gel method to form K4[a-SiW12O40]·nH2O/Si. Compound K4[a-SiW12O40]·nH2O/Si was characterized by diffraction, spectroscopic, and acidity  analyses follow by thermal activity test at higher temperature up to 600 oC. Analysis of FTIR spectrum showed all unique vibration of polyoxometalate K4[a-SiW12O40]·nH2O was appeared at wavenumber 800-1000 cm-1 before and after supporting process. Crystallinity of K4[a-SiW12O40]·nH2O and K4[a-SiW12O40]·nH2O/Si were also similar without changing Keggin structure. Compound K4[a-SiW12O40]·nH2O/Si showed higher acidity than K4[a-SiW12O40]·nH2O probably due to Lewis acidity species. Keggin structure of K4[a-SiW12O40]·nH2O/Si was still retained up to 600 oC showing thermal stability of K4[a-SiW12O40]·nH2O/Si at high temperature.Keyword : Keggin polyoxometalate, tetraethyl ortho silicate, thermal stability, acidity
Co-Authors A. Agnes, A. Addy Rachmat, Addy Adi Saputra Ahmad Fatoni ANDI WIJAYA Andreas, Roy Andriani Azora Arianti Marpaung Arison Musri Aslihati Aslihati, Aslihati Aslihayati Aslihayati, Aslihayati Benyamin Lakitan Christina, Mikha Meilinda Dedi Rohendi Dian Monariqsa Dormian A N Haloho, Dormian A N Eiffel Ostan Jeski Gultom, Eiffel Ostan Jeski Elfita . Elfita Elfita Eliza . Eliza Eliza Ema Veronika Turnip Eriza Sativa, Eriza Fahma Riyanti, Fahma Fahmariyanti Fahmariyanti Fatmawati Fatmawati Ferlinahayati Ferlinahayati Fitriliana Fitriliana Haris Kriswantoro Hermansyah Hermansyah Hesti A. Harahap, Hesti Hesti Rizki Amalia Hilda Zulkifli Hiroshi Nishihara Hitoshi Kondo intan permata sari Irianty, Yunita Jasantri, Didi Kiki Anggraini, Kiki Leni Sinaga, Leni Lestari Simanjuntak Lora Vitanesa, Lora Lucyanti Lucyanti, Lucyanti Lusi Teresia, Lusi Marieska Verawaty Mariska Verawaty, Mariska MIKSUSANTI MIKSUSANTI Muhammad Imron, Muhammad MUHAMMAD SAID Najma Annuria Fithri, Najma Annuria Narsito Narsito Neza Rahayu Palapa, Neza Rahayu Niken Oktora Nurlisa Hidayati Oktriyanti, Melantina Melan Palita Tamba Poedji Loekitowati Hariani R.A. Mika Melviana, R.A. Mika Radja Nardo Purba, Radja Nardo Rahayu, Bakri Rio Ramadhan, Jeri Randi O. Saragih, Randi O. Risfidian Mohadi Risma Kurniawati M Samat Samat, Samat Setiawan Yusuf, Setiawan Setiawati Yusuf, Setiawati Setyowati, Menik Sherly Agustina, Sherly Sri Juari Santosa Sueb, Abi Suheryanto Suheryanto, Suheryanto Tarmizi Taher Welinda Me, Welinda Winda Fitriana, Winda Yeni Iswanti, Yeni Yoshinori Yamanoi Yosi Saria Yosine Susi Yosine Susie Zazili Hanafiah