Two typical processes have been developed for the conversion of methane and carbon dioxide to higher valuable products: dry reforming of methane (DRM) and CO2‐oxidative coupling of methane (CO2‐OCM). Numerous articles reviewed progresses in either DRM or CO2‐OCM, but no one covers both processes. In this review article, we systematically evaluated progresses in both DRM and CO2‐OCM processes for conversion of methane and CO2 to highly valuable products. Critical issues, which are carbon deposition and high energy cost for DRM and the contradiction between large activity and high selectivity for CO2‐OCM, were emphasized. Strategies to develop effective catalysts were evaluated, including the enhancement of metal‐support interactions, the introduction of promotors, the formation of solid solutions, and the construction of core‐shell structures. Plasma and photocatalysis were discussed as new promising technologies for DRM and CO2‐OCM.

We induced a permanent plastic deformation in an originally straight double-walled nanotube by applying current to an individual nanotube that had been bent elastically under mechanical duress. This method is controllable and allows nanotubes' application as building blocks in nanostructures. Inserting pentagon–heptagon pairs into a nanotube created bending angles of 20–30°. The onset of plastic deformation, as measured using the current circumference-density, is less than 1/20 that of the sublimation. The onset decreases with increasing nanotube diameter. This process is performed using a transmission electron microscope: electron beam energy is not essential for the process but decreases the onset.

No abstract

No abstract

No abstract

Direct and highly efficient conversion of methane into methanol under a mild condition still remains a great challenge. Here, we report that Au-Pd/TiO2 could directly catalyze the conversion of methane...

No abstract

No abstract