✦ LIBER ✦

The hetero-homogeneous pyrolysis of propane, in the presence or in the absence of dihydrogen, and the measurement of uptake coefficients of hydrogen atoms

✍ Scribed by D. Perrin; R. Martin

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 405 KB
Volume: 32
Category: Article
ISSN: 0538-8066
DOI: 10.1002/(sici)1097-4601(2000)32:6<340::aid-kin2>3.0.co;2-#

No coin nor oath required. For personal study only.

✦ Synopsis

Propane pyrolysis is studied in the presence and the absence of dihydrogen between 743 and 803 K, in the propane pressure range 10-100 Torr, and at 20-254 Torr dihydrogen pressure. In unpacked Pyrex reactors, dihydrogen accelerates propane dehydrogenation and demethanation. The reaction is modeled by a conventional homogeneous free-radical chain mechanism.

Propane pyrolysis is strongly inhibited by the walls of reactors packed with stainless steel, zirconium, or palladium foils. Adding dihydrogen to propane still increases the rates of product formation. The reaction in these packed reactors is modeled by the kinetic scheme proposed for the homogeneous reaction and by the heterogeneous process

• of chain termination and initiation. In the absence of dihydrogen, step (Ϫw 2 ) is negligible and precise values of uptake coefficients of hydrogen atoms are obtained at 773 K: 0.31 for stainless steel 0.10 for zirconium 0.05 for palladium

📜 SIMILAR VOLUMES

Pyrolysis of methane in the presence of

Pyrolysis of methane in the presence of hydrogen

✍ Dr. Ola Olsvik; Prof. Dr. Odd A. Rokstad; Prof. Dr. Anders Holmen 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 855 KB

The kinetics of methane pyrolysis were studied in a tubular flow reactor in the temperature range 1200 to 1500°C at atmospheric pressure. To avoid excessive carbon formation the reaction time was short and the methane feed was diluted with hydrogen. Ethene, ethyne, benzene and hydrogen were the main

Mechanism of the pyrolysis of 1,2-dichlo

Mechanism of the pyrolysis of 1,2-dichloroethane in the absence and presence of added chlorine

✍ G. Huybrechts; G. Wouters 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 128 KB

## Abstract A detailed radical reaction model, both homogeneous and heterogeneous, is shown to describe quantitatively published initial rates of the pyrolysis of 1,2‐dichloroethane in the gas phase. These data were obtained in conditioned static reactors with different surface‐to‐volume ratios, in

Wall effects in the pyrolysis of diethyl

Wall effects in the pyrolysis of diethylether. A case of hetero-homogeneous pyrolysis at 500°C

✍ J. F. Foucaut; R. Martin 📂 Article 📅 1979 🏛 John Wiley and Sons 🌐 English ⚖ 366 KB

## Abstract The pyrolysis of diethylether has been studied at 500°C and 50 Torr initial pressure in packed vessels (surface‐to‐volume ratio 11 cm^−1^). In untreated vessels the reaction appears to be essentially homogeneous as reported before. On the contrary, it is very sensitive to the walls of P

Toxicity and uptake of TRI- and dibutylt

Toxicity and uptake of TRI- and dibutyltin in Daphnia magna in the absence and presence of nano-charcoal

✍ Liping Fang; Ole K. Borggaard; Peter E. Holm; Hans Christian Bruun Hansen; Nina 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 264 KB

## Abstract Butyltins (BTs), such as tributyltin (TBT) and dibutyltin (DBT), are toxic to aquatic organisms, but the presence of the strong adsorbent, black carbon (BC), can markedly influence BT toxicity and uptake in organisms. In the present study, the acute toxicity and uptake of TBT and DBT in

Pyrolysis of 1-chloro-1,1-difluoroethane

Pyrolysis of 1-chloro-1,1-difluoroethane in the absence and in the presence of CCl4 and mixtures of CCl4 + HCl

✍ G. Huybrechts; Y. Hubin 📂 Article 📅 1985 🏛 John Wiley and Sons 🌐 English ⚖ 354 KB

The thermal dehydrochlorination CF,CICH, + CFFCH, + HCl has been studied in a static system between 637 and 758 K. It is a homogeneous, molecular first-order reaction and its rate constant is given by log,, (k, s-') = -(53,400 2 100)/4.576T + (12.21 ? 0.03) This reaction has also been studied in the

First Hetero-Diels—Alder Reaction with I

First Hetero-Diels—Alder Reaction with Indoloquinone in the Presence of Hydrogen and Palladium.

✍ Jacques Gentili; Roland Barret 📂 Article 📅 2005 🏛 John Wiley and Sons ⚖ 20 KB 👁 1 views