Porous silicon carbide as a support for Mn/Na/W/SiC catalyst in the oxidative coupling of methane

Effect of thermal treatment on the stability of Na–Mn–W/SiO2 catalyst for the oxidative coupling of methane

“…However, as shown in previous studies, the stability of the catalyst can be improved by using a high surface area support or by applying different metal precursors [35][36][37] . It is interesting to note that previous studies suggest that the initial support material and the preparation of catalyst play an important role in the catalyst activity and stability despite the inevitable transformation of amorphous silica to crystalline phases, and thus decrease in surface area, at high temperatures 18,33,53 .…”

“…This transition was temperature driven and mainly dependent on the time-on-stream, rather than the applied conditions. With the further transition of cristobalite to tridymite and quartz, the surface area of the catalyst is expected to decrease, however still remaining comparable with the surface area of catalyst containing only cristobalite 16 , 22 , 53 . The evolution of the catalyst support is also in agreement with long-term stability tests performed by Wang et al 16 , where the catalyst after 500 h time on stream was found to contain large amounts of quartz and tridymite.…”

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

“…Highly porous ceramics provide a growing interest for multifunctional applications such as molten metal filtration, water treatment, catalyst support, and hot gas separation owing to their tunable pore structure and unique thermal properties . Hierarchical structuring of these materials is a burgeoning scientific field which attracts tremendous interests as it contains a vast range of porosity levels with multiple length scales .…”

Hydrogen/Deuterium‐Exchange Reactions of Methane with Aromatics and Cyclohexane Catalyzed by a Nanoscopic Aluminum Chlorofluoride

“…[4] The reactions take place in the homogeneous phase, and they involve electrophilica ctivationo fC H 4 at Pt II centers to produce a Pt II -CH 3 species. [8] There are also reports on the oxidative coupling of methaneatmetal oxides, including its efficient conversion into alkanes [9] and aromatics; [10] although theser esults are promising, methanea ctivation in either the homogeneous [11] or heterogeneousp hase needs the developmento fn ew catalytic systems along with ad eeper understanding of the reaction mechanisms. [6] At ah eterogeneous phase, catalytic oxidation of methane has been accomplished by various metal-modified zeolites as well as metal oxides.…”