Malaysian Journal of Analytical Sciences Vol 23 No 5 (2019): 892 - 900

DOI: 10.17576/mjas-2019-2305-14

 

 

 

CHARACTERIZATION AND CATALYTIC ACTIVITY OF Os/BENTONITE CATALYST FOR HYDROGENOLYSIS OF GLYCEROL

 

(Pencirian dan Aktiviti Pemangkin Os/Bentonit untuk Tindak Balas Hidrogenolisis Gliserol)

 

Noraini Hamzah¹*, Wan Zurina Samad², Nazrizawati Ahmad Tajuddin³, Mohd Ambar Yarmo⁴

 

¹School of Chemistry and Environment, Faculty of Applied Sciences,

Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

²Department of Chemistry, Kulliyah of Sciences,

 International Islamic University Malaysia, 25200 Kuantan, Pahang, Malaysia

³Department of Chemistry,

Universiti Teknologi MARA, Perak Branch, Tapah Campus, 35400 Tapah, Perak, Malaysia 

⁴School of Chemical Science and Food Technology, Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

*Corresponding author:  pnoraini@salam.uitm.edu.my

 

 

Received: 13 September 2018; Accepted: 29 July 2019

 

 

Abstract

In this study, osmium catalysts (Os/Bentonite, Os/TiO₂) and ruthenium catalysts (Ru/Bentonite, Ru/TiO₂) with 5% wt/wt metal loading were prepared using impregnation method and applied to convert glycerol, a renewable feedstock, to value-added chemical, 1,2-propanediol. Among these catalysts, the bentonite supported Os catalyst showed high performance with conversion and selectivity to 1,2-propanediol which were 63.3% and 82.7%, respectively. Catalytic performances of these catalysts were evaluated in glycerol hydrogenolysis using stainless steel autoclave reactor equipped with a magnetic stirrer at 150 °C, hydrogen pressure 20 - 40 bar for 7 hours reaction. The effect of glycerol concentration and reaction temperature were investigated to obtain optimum conditions due to glycerol conversion and products selectivity greatly depend on these factors. Experimental results show that hydrogenolysis of glycerol at 160 °C reaction temperature and 5% glycerol concentration gives a conversion of glycerol up to 100.0% with 82.9% selectivity of 1,2-propandiol. This study showed that bentonite which is cheap and abundant clay is potentially a good catalyst support material. The Os/bentonite catalyst was characterized by Temperature Programmed Reduction (TPR), nitrogen adsorption-desorption analysis (BET), Temperature Programmed Desorption-Ammonia(TPD-NH₃) for obtaining some physicochemical properties of the catalysts.

 

Keywords:  osmium, bentonite, glycerol hydrogenolysis, 1,2-propanediol

 

Abstrak

Dalam kajian ini, pemangkin osmium (Os/bentonit, Os/TiO₂) dan pemangkin ruthenium (Ru/bentonite, Ru/TiO₂) dengan muatan logam 5% wt/wt disediakan dengan menggunakan kaedah impregnasi dan diaplikasikan kepada penukaran gliserol yang merupakan bahan mentah yang boleh diperbaharui kepada bahan kimia yang bernilai tinggi iaitu 1,2-propanadiol. Antara pemangkin yang dikaji, Os berpenyokong bentonit menunjukkan sifat pemangkin yang baik dengan nilai peratus penukaran dan pemilihan masing-masing adalah 63.3% dan 82.7%. Aktiviti pemangkin diuji dalam tindak balas hidrogenolisi gliserol menggunakan reaktor autoklaf tahan karat yang dilengkapi dengan pengacau magnetik pada suhu 150 ⁰C, tekanan hidrogen 20-40 bar selama 7 jam. Kesan kepekatan gliserol dan suhu tindak balas didapati memberi kesan signifikasi terhadap peratus penukaran gliserol dan pemilihan produk. Keputusan kajian menunjukkan bahawa keadaan optimum pada suhu 160 ⁰C dan kepekatan gliserol 5% (wt/wt) memberikan penukaran gliserol sehingga 90.0% dengan peratus pemilihan terhadap 1,2-propanadiol 82.9%. Kajian ini menunjukkan bahawa bentonit yang merupakan tanah liat  murah dan mudah didapati adalah berpotensi digunakan sebagai penyokong mangkin. Pemangkin Os/bentonit dicirikan menggunakan suhu pemprograman penurunan (TPR), analisis jerapan-nyahjerapan nitrogen (BET), suhu pemprograman nyahjerapan ammonia (TPD-NH3) bagi mendapatkan maklumat mengenai sifat fizikal dan kimia pemangkin.

 

Kata kunci:  osmium, bentonit, hidrogenolisis gliserol, 1,2-propanadiol

 

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