scholarly journals Mechanistic insights into the conversion of dimethyl ether over ZSM-5 catalysts: a combined temperature-programmed surface reaction and microkinetic modelling study

2021 ◽  
pp. 116620
Author(s):  
Toyin Omojola ◽  
Andre C. van Veen
Keyword(s):  
Dimethyl Ether ◽  
Surface Reaction ◽  
Temperature Programmed Surface Reaction ◽  
Temperature Programmed ◽  
Modelling Study

scholarly journals Mechanistic Insights into the Conversion of Dimethyl Ether over ZSM-5 Catalysts: A Combined Temperature Programmed Surface Reaction and Microkinetic Modelling Study

2021 ◽  
Author(s):  
Toyin Omojola ◽  
Andre van Veen
Keyword(s):  
Dimethyl Ether ◽  
Surface Reaction ◽  
Zeolite Catalyst ◽  
Activation Energies ◽  
Reactor Performance ◽  
Linear Partial Differential Equations ◽  
Temperature Programmed Surface Reaction ◽  
Temperature Programmed ◽  
Adsorption Desorption ◽  
Desorption Reaction

Rates of adsorption, desorption, and surface reaction of dimethyl ether (DME) to olefins over fresh and working ZSM-5 catalysts of different Si/Al ratios (36 and 135) have been decoupled using a combination of temperature programmed surface reaction experiments and microkinetic modelling. Transient reactor performance was simulated by solving coupled 1D non-linear partial differential equations accounting for elementary steps occurring during the induction period based on the methoxymethyl mechanism on the zeolite catalyst, and axial dispersion and convection in the reactor. Propylene is the major olefin formed and scaling relations between activation energies of DME desorption and barriers of formation of methoxymethyl and methyl propenyl ether are observed. Six ensembles of sites are observed with a maximum of three adsorption/desorption sites and three adsorption/desorption/reaction sites. Barriers are generally higher over working catalysts than fresh catalysts. Activation energies of propylene formation of ca. 200 kJ mol<sup>-1</sup> are obtained corroborating direct mechanistic proposals.

scholarly journals Mechanistic Insights into the Conversion of Dimethyl Ether over ZSM-5 Catalysts: A Combined Temperature Programmed Surface Reaction and Microkinetic Modelling Study

2021 ◽  
Author(s):  
Toyin Omojola ◽  
Andre van Veen
Keyword(s):  
Dimethyl Ether ◽  
Surface Reaction ◽  
Zeolite Catalyst ◽  
Activation Energies ◽  
Reactor Performance ◽  
Linear Partial Differential Equations ◽  
Temperature Programmed Surface Reaction ◽  
Temperature Programmed ◽  
Adsorption Desorption ◽  
Desorption Reaction

Rates of adsorption, desorption, and surface reaction of dimethyl ether (DME) to olefins over fresh and working ZSM-5 catalysts of different Si/Al ratios (36 and 135) have been decoupled using a combination of temperature programmed surface reaction experiments and microkinetic modelling. Transient reactor performance was simulated by solving coupled 1D non-linear partial differential equations accounting for elementary steps occurring during the induction period based on the methoxymethyl mechanism on the zeolite catalyst, and axial dispersion and convection in the reactor. Propylene is the major olefin formed and scaling relations between activation energies of DME desorption and barriers of formation of methoxymethyl and methyl propenyl ether are observed. Six ensembles of sites are observed with a maximum of three adsorption/desorption sites and three adsorption/desorption/reaction sites. Barriers are generally higher over working catalysts than fresh catalysts. Activation energies of propylene formation of ca. 200 kJ mol<sup>-1</sup> are obtained corroborating direct mechanistic proposals.

Temperature-programmed surface reaction (TPSR) of CH4 synthesis by PdxNi100−x nanoparticles

2009 ◽  
Vol 255 (11) ◽  
pp. 5802-5805 ◽  
Author(s):  
Kuan-Wen Wang ◽  
Shu-Ru Chung ◽  
Yu-Chen Wei ◽  
Jyh-Fu Lee ◽  
Tsong P. Perng
Keyword(s):  
Surface Reaction ◽  
Temperature Programmed Surface Reaction ◽  
Temperature Programmed
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