Assessment on the effect of sulfuric acid concentration on physicochemical properties of sulfated-titania catalyst and glycerol acetylation performance by Mohamad Rasid, Shera Farisya, Ramli, Irmawati, Ishak, Nor Shafizah, Yap, Taufiq Yun Hin, Muhamad, Ernee Noryana, Lee, Siew Ling, Salamun, Nurrulhidayah