OPTIMIZATION OF PRASEODYMIUM OXIDE BASED CATALYSTS FOR METHANATION REACTION OF SIMULATED NATURAL GAS USING BOX-BEHNKEN DESIGN. J. Teknol. [Internet]. 2015 Jun. 23 [cited 2024 Dec. 22];75(1). Available from: https://journals.utm.my/jurnalteknologi/article/view/2669