This work aims to develop the process and catalyst for depolymerizing lignin from local agricultural residues (e.g. bagasse, rice husk, and corncon), and pulp and paper industry to green chemicals. Various heterogeneous catalysts will be evaluated for the synthesis of aromatic monomers from depolymerization of lignin. The optimization of reaction conditions such as temperature, time, reaction media and additives etc. will be done to achieve the maximum yield of aromatic monomers, by suppressing the formation of degradation products (coke and char) and gas formation. Moreover, catalytic efficiency and stability toward the lignin depolymerization of synthesized catalysts will be evaluated to compare with the commercial-grade catalysts.