W. Fatra

Preparation of CaO/Fly ash as a catalyst inhibitor for transesterification process off palm oil in biodiesel production

Z. Helwani, E. Saputra, W. Fatra, 2018 .

Impregnation of CaO from Eggshell Waste with Magnetite as a Solid Catalyst (Fe3O4/CaO) for Transesterification of Palm Oil Off-Grade

T. Mahlia, Z. Helwani, E. Saputra, 2020 .

Effect of Alkaline Treatment on the Properties of Oil Palm Empty Fruit Bunch Fiber-reinforced Polypropylene Composite

Z. Helwani, W. Fatra, Jecky '. Asmura, 2016 .

Alternative Briquette Material Made from Palm Stem Biomass Mediated by Glycerol Crude of Biodiesel Byproducts as a Natural Adhesive

T. Mahlia, Z. Helwani, M. Marlina, 2020, Processes.

Torrefaction of Empty Fruit Bunches: Evaluation of Fuel Characteristics Using Response Surface Methodology

Muslem, Z. Helwani, R. Idroes, 2020, IOP Conference Series: Materials Science and Engineering.

Alkaline Treatment of Oil Palm Frond Fibers by Using Extract of Oil Palm EFB Ash for Better Adhesion toward Polymeric Matrix

Z. Helwani, W. Fatra, Hari ' Rionaldo, 2015 .

Effect of process variables on the calorific value and compressive strength of the briquettes made from high moisture Empty Fruit Bunches (EFB)

Z. Helwani, M. Othman, W. Fatra, 2018 .