[an　error　occurred　while　processing　this　directive]　ISSN　1003-9953　COx-Free　Hydrogen　and　Carbon　Nanof　ibers　Produced　from　Direct　Decomposition　of　Methane　on　Nickel-Based　Catalysts　Siang-Piao　Chai,　Sharif　Hussein　Sharif　Zein,　Abdul　Rahman　Mohamed　School　of　Chemical　Engineering,　Universiti　Sains　Malaysia,　Engineering　Campus,　Seri　Ampangan,14300　Nibong　Tebal,　SPS　Penang,　Malaysia　Direct　decomposition　of　methane　was　carried　out　using　a　fixed-bed　reactor　at　700　degree　forthe　production　of　COx-free　hydrogen　and　carbon　nanofibers.　The　catalytic　performance　of　NiO-M/SiO2catalysts　(where　M=AgO,　CoO,　CuO,　FeO,　MnOx　and　MoO)　in　methane　decomposition　was　investigated.