Methanol-to-gasoline(MTG)conversion over ZSM-5. A temperature programmed surface reaction study

The conversion of methanol to gasoline over zeolite ZSM-5 has been studied by temperature programmed surface reaction (TPSR). The technique is able to monitor the two steps in the process: the dehydration of methanol to dimethyl ether and the subsequent conversion of dimethyl ether to hydrocarbons. The activation barriers associated with each step were evaluated from the TPSR profiles and are 25.7 and 46.5 kcal/mol respectively. The methanol desorption profile shows considerable change with the amount of methanol molecules adsorbed per Brønsted site of the zeolite. The energy associated with the desorption process, (CH3OH)nHs+-ZSM5 → (CH3OH)n−1H+-ZSM5+CH5OH, shows a spectrum of values depending onn.

[1]  B. Munson,et al.  Proton affinities of some oxygenated compounds , 1973 .

[2]  P. Kebarle,et al.  Gas phase ion equilibriums studies of the hydrogen ion by methanol, dimethyl ether, and water. Effect of hydrogen bonding , 1973 .

[3]  Clarence Dayton Chang,et al.  The conversion of methanol and other O-compounds to hydrocarbons over zeolite catalysts: II. Pressure effects , 1977 .

[4]  Karsten Pedersen,et al.  Infrared and temperature-programmed desorption study of the acidic properties of ZSM-5-type zeolites , 1981 .

[5]  R. Gorte,et al.  The adsorption of methanol and water on H-ZSM-5 , 1984 .

[6]  R. Gorte,et al.  The influence of oxonium ion and carbenium ion stabilities on the Alcohol/H-ZSM-5 interaction☆ , 1986 .

[7]  H. Jobic,et al.  Quasi-elastic neutron scattering study of the molecular motions of methanol adsorbed on H-ZSM-5 , 1986 .

[8]  R. Madix.  Molecular Transformations on Single Crystal Metal Surfaces , 1986, Science.

[9]  J. Nováková,et al.  Primary reaction steps in the methanol-to-olefin transformation on zeolites , 1987 .

[10]  R. Gorte,et al.  Stability of adsorption complexes formed by alcohols on H-ZSM-5 , 1988 .

[11]  R. Gorte,et al.  Stoichiometric adsorption complexes in H-ZSM-5 , 1988 .

[12]  C. Catlow,et al.  Structure and dissociation mechanisms of methanol in ZSM-5 zeolite , 1989 .

[13]  C. Dybowski,et al.  Investigation of methanol adsorbed on zeolite H-ZSM-5 by carbon-13 NMR spectrometry , 1990 .

[14]  J. Klinowski,et al.  Solid-state NMR studies of the shape-selective catalytic conversion of methanol into gasoline on zeolite ZSM-5 , 1990 .

[15]  J. Klinowski,et al.  Adsorption complexes of methanol on zeolite ZSM-5 , 1990 .

[16]  C. Dybowski,et al.  Investigation of Methanol Adsorbed on Zeolite H-ZSM-5 by 13C NMR Spectrometry , 1991 .

[17]  H. Pfeifer,et al.  Magic-angle-spinning NMR studies of acid sites in zeolite H-ZSM-5 , 1991 .

[18]  S. Vasudevan,et al.  Temperature-programmed desorption and surface reaction of thiophene over co-mo/.gamma.-Al2O3 hydrodesulfurization catalysts , 1994 .

[19]  S. Vasudevan,et al.  Temperature programmed desorption studies on hydrodesulfurization catalysts , 1994 .