Infrared spectra of chemisorbed molecules

Erkelens, J.; Wösten, W. J.

doi:10.1016/0021-9517(78)90037-4

“…1 -6, exp ( -t k p KEPC,H,/N) and Neither eqn (5) nor (6) is in accord with the experimental observations in this work in that eqn ( 5 ) predicts that r(CH,) + 0 as t + 00 and eqn (6) predicts that the ratio of r(CH,)/r, is time-independent. Our data show that the r(CH,) approaches a steady-state [rm(CH,)] value as t --+ and furthermore, the ratio of r(CH,)/r, is clearly time-dependent.…”

Section: Two-(or Multiple-) Site Modelmentioning

confidence: 51%

Kinetic modelling of multiple-site activity and the kinetics of inhibition reactions in the hydrogenolysis of C2H6 on a nickel wire catalyst

Kristyán

¹

,

Timmons

²

1987

J. Chem. Soc., Faraday Trans. 1

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Analysis of kinetic data on the rate of CH, production in the hydrogenolysis of C,H, carried out using a specially activated Ni wire catalyst indicates the presence of at least two distinct types of active surface sites on the catalyst. The results are interpreted in terms of competitive catalysis at these two sites but with only one type of site subject to irreversible inhibition. A model involving parallel competitive poisoning on one type of site is developed and shown to account for the observed results. From this model the separate activation energies for the normal hydrogenolysis reaction (129 kJ mol-l) and the self-poisoning reaction (146 kJ mol-I) are calculated.

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In Situ Stimulus Response Study on the Acetylene/Ethylene Purification Process in MOFs

Cai,

Yu,

Wang

et al. 2024

Angewandte Chemie

0

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Efficient removal of acetylene (C2H2) impurities from polymer‐grade ethylene (C2H4) in a simple, clean manner remains a challenging goal in industry. The use of porous materials such as metal–organic frameworks (MOFs) is promising for this aim but the acquisition of high purification performance is still hindered by few knowledge on the purification process because the previous conclusions were derived basically from the non‐breakthrough tests or ignored the influence of structural difference (crystal structure, morphology, or defect). Here we propose an unprecedented in situ stimulus response strategy to minimize the influence of structural difference, obtain the gas‐loading crystal structures of the same MOF before and after light or heat stimulation, directly observe the evolution of pore charge distribution and pore×××gas interactions under light/heat induction, and finally summarizes the favorable structure for highly efficient purification of C2H4. This study opens a new route to understand the relationship between the structure and separation performance for porous materials.

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In Situ Stimulus Response Study on the Acetylene/Ethylene Purification Process in MOFs

Cai,

Yu,

Wang

et al. 2024

Angew Chem Int Ed

0

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Efficient removal of acetylene (C2H2) impurities from polymer‐grade ethylene (C2H4) in a simple, clean manner remains a challenging goal in industry. The use of porous materials such as metal–organic frameworks (MOFs) is promising for this aim but the acquisition of high purification performance is still hindered by few knowledge on the purification process because the previous conclusions were derived basically from the non‐breakthrough tests or ignored the influence of structural difference (crystal structure, morphology, or defect). Here we propose an unprecedented in situ stimulus response strategy to minimize the influence of structural difference, obtain the gas‐loading crystal structures of the same MOF before and after light or heat stimulation, directly observe the evolution of pore charge distribution and pore×××gas interactions under light/heat induction, and finally summarizes the favorable structure for highly efficient purification of C2H4. This study opens a new route to understand the relationship between the structure and separation performance for porous materials.

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Infrared spectra of chemisorbed molecules

Cited by 21 publications

References 24 publications

Kinetic modelling of multiple-site activity and the kinetics of inhibition reactions in the hydrogenolysis of C2H6 on a nickel wire catalyst

Kinetic modelling of multiple-site activity and the kinetics of inhibition reactions in the hydrogenolysis of C2H6 on a nickel wire catalyst

In Situ Stimulus Response Study on the Acetylene/Ethylene Purification Process in MOFs

In Situ Stimulus Response Study on the Acetylene/Ethylene Purification Process in MOFs

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