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Lead oxide-magnesia aerogel catalysts for the oxidative coupling of methane with nitrous oxide

✍ Scribed by Gérard Marcel Pajonk; Tammam Manzalji

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
598 KB
Volume
108
Category
Article
ISSN
0926-860X

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✦ Synopsis

A series of PbO-MgO aerogels differing by their atomic Pb/Mg ratios were tested at 720°C for methane coupling using nitrous oxide to ethane and ethylene. The best catalyst (Pb/Mg =OS) gave a C,, overall selectivity of 69%, a high activity (at W/F=0.03 g s cm-') and a good stability with time-on-stream. A kinetic study showed that the reaction is of the Rideal-Eley type with nitrous oxide reacting in the adsorbed phase. Other supports such as A1202, ZrO,, TiOl and SiOz were used and the activities recorded agreed well with the basicity of the catalyst, PbO-SiOz being totally inactive: MgO > ZrO, > A&O3 > TiO, > > > SiO,.

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Oxidative coupling of methane over a γ-alumina-supported lead oxide catalyst
✍ Sang-Eon Park; Jong-San Chang 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 984 KB

Volcano-type patterns, not only in methane conversion but also in C x + hydrocarbons' selectivity, were observed over 60 wt.-% of PbO loaded on y-alumina. The maximum population of PbAl\*O, spine1 phase, considered to be formed due to the diffusion of Pb\*+ as well as A13+ and O\*-ions, was obtained