There are various thermo-chemical conversion technologies which can be applied for hydrogen production from biomass. Gasification technology provides a competitive way to convert solid biomass like oil palm waste to a uniform gas mixture namely hydrogen, carbon monoxide, methane and carbon dioxide. Catalysts are widely used for syngas cleaning and play an important role in enhancing the production of hydrogen by gasification process. Various catalytic systems have been studied to improve hydrogen production and reduce tar content in syngas produced from biomass. Calcined dolomite can be an effective catalyst for minimizing tar in the product gas. Dolomite activity can be directly related to the CaO content, Fe2O3 content, pore size and distribution. A major problem with using dolomite is the deactivation due to carbon deposition and it is a soft and fragile material; however, dolomite is cheap and can be easily replaced.