Effects of metal impregnation on the activity, selectivity and deactivation of a high silica MFI zeolite when converting methanol to light alkenes

Al-Jarallah, A. M.; El-Nafaty, Usman Aliyu; Abdillahi, Mohamed M.

doi:10.1016/s0926-860x(96)00379-1

Cited by 49 publications

(22 citation statements)

References 10 publications

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“…Much attention has been paid to this process focusing on improving specific olefin selectivity in the last three decades [1,2]. A high selectivity to ethylene was achieved over Ni/SAPO-34 catalyst [3], while propylene selectivity could be increased with the modified ZSM-5 catalysts [4,5]. Zhao et al [6] gained a propylene selectivity of 44.5% over Zr and P modified ZSM-5 and the ratio of propylene to ethylene was 16.…”

Section: Introductionmentioning

confidence: 99%

Ca modified ZSM-5 for high propylene selectivity from methanol

Zhang

Gao

et al. 2010

Reac Kinet Mech Cat

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The highest propylene selectivity and best catalytic stability were gained over Ca modified ZSM-5 that had little free Brønsted acid sites, which indicated that Ca interacted with Brønsted acid sites and thus participated in the catalytic reaction as supported by the MTO data of Na modified ZSM-5. A possible mechanism that involves the formation of acid-base centers by hydrolyzing Ca species in the presence of water is suggested.

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Section: Introductionmentioning

confidence: 99%

Ca modified ZSM-5 for high propylene selectivity from methanol

Zhang

Gao

et al. 2010

Reac Kinet Mech Cat

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“…As for the variation of product selectivity, it is well known that adding nitrogen or water to the methanol feed [11,14] can increase light olefin selectivity. In our experiment of adding nitrogen, water, and aromatics to the methanol feed, the light olefin selectivity was increased.…”

Section: Discussionmentioning

confidence: 99%

“…Nitrogen was first used as diluent for methanol to olefin to decrease the methanol partial pressure and increase the catalytic performance [9][10][11]. Dehertog and Forment [12] studied the influence of catalyst parameters, such as silicon/aluminum ratio, cation exchange, and phosphorus modification, as well as the reaction conditions on the conversion of methanol to light olefin on ZSM-5.…”

Section: Introductionmentioning

confidence: 99%

Effects of Aromatics on the Stability and Product Distribution of the Methanol to Olefin Process

et al. 2011

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Methanol to olefin process was investigated over a steam-treated Ca-ZSM-5 catalyst in a flow-type fixed bed reactor by adding aromatics to the methanol feed. As a comparison, the catalytic performance in the presence of nitrogen and water was also investigated. The experimental results exhibit that in the presence of aromatics, the total light olefin selectivity and the ethylene selectivity increased, while propylene selectivity increased with adding o-xylene and m-xylene to the methanol feed, but decreased with adding benzene, toluene, p-xylene and ethylbenzen to the methanol feed. The catalyst was characterized by temperature-programmed desorption of ammonia, N 2 adsorption, and scanning electron microscope. The adsorption of water and aromatics on the catalyst was also studied. Based on the results, it is concluded that aromatics may be responsible for the formation of light olefins and be more favorable for ethylene than propylene in methanol conversion.

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“…The high surface area associated with the zeolites allows a high degree of dispersion of active metals over the zeolites, making maximum use of the metal deposited. The pentasil ZSM-5 was investigated as catalyst for methanol conversion to hydrocarbons [1][2][3][4][5][6][7][8]. The effect of temperature, space velocity and pressure on the methanol conversion and hydrocarbons yields was studied [3].…”

Section: Introductionmentioning

confidence: 99%

Combined experimental and kinetic modeling studies for the conversion of gasoline range hydrocarbons from methanol over modified HZSM-5 catalyst

Zaidi

Pant

2010

Korean J. Chem. Eng.

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The reaction was carried out in fixed bed reactor. The effect of process variables on the activity of oxalic acid treated 0.5 wt% ZnO/7 wt% CuO/HZSM5 catalyst for the conversion of methanol to gasoline range hydrocarbons was studied. The catalyst was prepared by incipient wetness impregnation method. After impregnation the catalyst was treated with oxalic acid. The validity of kinetic model proposed for the methanol to gasoline range hydrocarbon process at zero time on stream was studied, from the experimental results obtained in a wide range of operating conditions. The kinetic parameters for various models were calculated by solving the equation of mass conservation in the reactor for the lumps of the kinetic models. The kinetic model fitted well for simulating the operation in the fixed bed reactor in the range of 635 to 673 K,with regression coefficient (R 2 ) higher than 0.96.

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Effects of metal impregnation on the activity, selectivity and deactivation of a high silica MFI zeolite when converting methanol to light alkenes

Cited by 49 publications

References 10 publications

Ca modified ZSM-5 for high propylene selectivity from methanol

Ca modified ZSM-5 for high propylene selectivity from methanol

Effects of Aromatics on the Stability and Product Distribution of the Methanol to Olefin Process

Combined experimental and kinetic modeling studies for the conversion of gasoline range hydrocarbons from methanol over modified HZSM-5 catalyst

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