Evolution of the reaction mechanism during the MTH induction period over the 2-dimensional FER zeolite

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 56698-56704 ◽  
Author(s):  
Liang Qi ◽  
Jinzhe Li ◽  
Lei Xu ◽  
Zhongmin Liu
Keyword(s):  
Reaction Mechanism ◽  
Induction Period ◽  
Dual Cycle ◽  
Zeolite P

During the MTH reaction over HZSM-35, the dual-cycle mechanism was found to evolve evidently as the induction reaction progressed.

scholarly journals Selective methanethiol-to-olefins conversion over HSSZ-13 zeolite

2021 ◽  
Vol 57 (27) ◽  
pp. 3323-3326
Author(s):  
Miao Yu ◽  
Nicoló Tormene ◽  
Aleksei Bolshakov ◽  
Brahim Mezari ◽  
Anna Liutkova ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Light Olefins ◽  
Zeolite P

We demonstrated that methanethiol can be selectively converted to light olefins over 8MR zeolites which provides clues about the reaction mechanism of MTH chemistry.

Study of the mechanism of the oscillating reaction between bromate and phenol

1982 ◽  
Vol 47 (9) ◽  
pp. 2454-2465 ◽  
Author(s):  
Antonín Tockstein ◽  
Marie Handlířová
Keyword(s):  
Reaction Mechanism ◽  
Kinetic Equation ◽  
Induction Period ◽  
Order Reaction ◽  
Second Order ◽  
Limiting Current ◽  
Ion Selective Electrodes ◽  
Second Order Reaction ◽  
Oscillating Reaction

In the oscillating reaction of bromate with phenol in the medium of 0.4M-H2SO4, the length of the induction period is governed by a kinetic equation for a second-order reaction with a stoichiometry 1 : 1. The concentration of quinones in the reaction mixture increases also according to a kinetic equation for a second-order reaction. The influence of various compounds is discussed, whose additions shorten or prolong the induction period, bring about oscillations in a nonoscillating reaction mixture, or change the frequency of these oscillations. From the comparison of the time dependences of the potential of a platinum and an ion-selective electrodes and of the limiting current of the quinones, a reaction mechanism was proposed.

Direct observation of methylcyclopentenyl cations (MCP+) and olefin generation in methanol conversion over TON zeolite

2016 ◽  
Vol 6 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Jinbang Wang ◽  
Yingxu Wei ◽  
Jinzhe Li ◽  
Shutao Xu ◽  
Wenna Zhang ◽  
...  
Keyword(s):  
Induction Period ◽  
Direct Observation ◽  
Methanol Conversion ◽  
Hydrocarbon Pool ◽  
Zeolite P ◽  
First Time

An induction period and MCP+ formed in the methanol conversion have been observed successfully for the first time, indicating that the hydrocarbon pool (HCP) mechanism cannot be ruled out over H-ZSM-22.

Role of naphthalene during the induction period of methanol conversion on HZSM-5 zeolite

2016 ◽  
Vol 6 (11) ◽  
pp. 3737-3744 ◽  
Author(s):  
Liang Qi ◽  
Jinzhe Li ◽  
Yingxu Wei ◽  
Lei Xu ◽  
Zhongmin Liu
Keyword(s):  
Induction Period ◽  
Methanol Conversion ◽  
Lower Activity ◽  
Zeolite P

Despite the lower activity of naphthalene compared with that of methylbenzenes, its activity was also proved over an HZSM-5 catalyst.

Arylation of enelactams using TIPSOTf: reaction scope and mechanistic insight

2021 ◽  
Author(s):  
Tomasz J. Idzik ◽  
Zofia M. Myk ◽  
Łukasz Struk ◽  
Magdalena Perużyńska ◽  
Gabriela Maciejewska ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Multinuclear Nmr ◽  
Mechanistic Insight ◽  
Nmr Study ◽  
Wide Range

Triisopropylsilyltrifluoromethanesulfonate can be effectively used for the arylation of a wide range of enelactams. The multinuclear NMR study provided deep insights into the reaction mechanism.

Fibrin Formation: The Role of the Fibrinogen-Fibrin Monomer Complex

1976 ◽  
Vol 36 (01) ◽  
pp. 037-048 ◽  
Author(s):  
Eric P. Brass ◽  
Walter B. Forman ◽  
Robert V. Edwards ◽  
Olgierd Lindan
Keyword(s):  
Particle Size ◽  
Induction Period ◽  
Fibrin Clot ◽  
Clot Formation ◽  
Appreciable Amount ◽  
Buffer System ◽  
Homeostatic Mechanism ◽  
Fibrin Formation ◽  
Fibrin Monomer

SummaryThe process of fibrin formation using highly purified fibrinogen and thrombin was studied using laser fluctuation spectroscopy, a method that rapidly determines particle size in a solution. Two periods in fibrin clot formation were noted: an induction period during which no fibrin polymerization occurred and a period of rapid increase in particle size. Direct measurement of fibrin monomer polymerization and fibrinopeptide release showed no evidence of an induction period. These observations were best explained by a kinetic model for fibrin clot formation incorporating a reversible fibrinogen-fibrin monomer complex. In this model, the complex serves as a buffer system during the earliest phase of fibrin formation. This prevents the accumulation of free polymerizable fibrin monomer until an appreciable amount of fibrinogen has reacted with thrombin, at which point the fibrin monomer level rises rapidly and polymerization proceeds. Clinically, the complex may be a homeostatic mechanism preventing pathological clotting during periods of elevated fibrinogen.

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