Ni@ZrO2 yolk-shell catalyst for CO2 methane reforming: Effect of Ni@SiO2 size as the hard-template.

This paper reports the usage ratio of TEOS and Zr(OBu)4 on the formation of Ni@ZrO2 yolk-shell for dry reforming of methane. From XPS analysis, the ZrO2 hollow shell texture is demonstrated to be [TEOS]/[Zr(OBu)4] dependent due to different sizes of SiO2 produced. It found that an adequate ratio of [TEOS]/[Zr(OBu)4] improves the catalytic conversion of dry reforming of methane. It (Ni@ZrO2-SiZr-7.7) shows 90% conversion for CH4 and 93% for CO2 at a WHSV of 72,000 mLgcat-1h-1 for 50 h at 800 °C with TOFCH4 of 8.7 s-1. It proposed that the changes in surface Si/Zr and gradual interconnecting pores contributed to its activity and stability. These finding's potential to be utilized in other high-temperature reactions.

A soft-templated method to synthesize sintering-resistant Au-mesoporous-silica core-shell nanocatalysts with sub-5 nm single-cores.

Nano-gold (sub-5 nm)@mesoporous-silica (m-SiO2) core-shell nanospheres with controlled size and core number were prepared via a soft-templated method. The single-core Au@m-SiO2 particles showed great sintering-resistance at 750 °C and kept high catalytic activity for CO oxidation after the treatment.