Iran Polymer and Petrochemical Institute Polyolefins Journal 2322-2212 5 1 2018 01 01 Selective production of light olefins from methanol over desilicated highly siliceous ZSM-5 nanocatalysts 59 70 1501 10.22063/poj.2017.1501 EN Mohammad Rostamizadeh Department of Chemical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, P.O. Box: 51335-1996, Iran Environmental Engineering Research Center, Sahand University of Technology, Sahand New Town, Tabriz, Iran Fereydoon Yaripour Catalysis Research Group, Petrochemical Research & Technology Company, National Iranian Petrochemical Company, Tehran, Iran Hossein Hazrati Department of Chemical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, P.O. Box: 51335-1996, Iran Environmental Engineering Research Center, Sahand University of Technology, Sahand New Town, Tabriz, Iran Journal Article 2017 07 17 Highly siliceous ZSM-5 nanocatalysts can dehydrate methanol to a wide range of hydrocarbons. In this study, the development of hierarchical H-ZSM-5 nanocatalysts (Si/Al=200) were reported for the methanol-toolefins (MTO) reaction. The nanocatalysts were prepared through a hydrothermal technique and treated by NaOH desilication. The parent and desilicated nanocatalysts were characterized using FE-SEM, XRD, FTIR, NH₃-TPD and N₂ adsorption-desorption techniques. The mesoporosity increased five times without significant collapse of the crystalline framework as a result of the appropriate desilication of H-ZSM-5 nanocatalyst. For the nanocatalyst, a high surface area of 189.5 m² g^-1, mesopore volume of 0.35 cm³ g^-1 and well-adjusted strong acidity of 0.16 mmol NH₃ g^-1 resulted in a high methanol conversion of 100%, high propylene selectivity of 43% and low light paraffins selectivity of <8% in the MTO reaction. A broad mesopore size of 2-10 nm suppressed coke deposition and provided a long catalytic life time of 75 h. The developed high silica nanocatalyst showed a high potential for industrial applications due to its stable performance. http://poj.ippi.ac.ir/article_1501_10afed0b52288161e475e09d824ffd52.pdf