Mesoporous silica-encaged ultrafine ceria–nickel hydroxide nanocatalysts for solar thermochemical dry methane reforming

Abstract

Reforming of methane to produce synthesis gas for the Fischer–Tropsch process provides an alternative to fossil fuels. Silica-encaged ceria–nickel hydroxide catalysts were produced by an in situ synthesis method to obtain ultrafine bimetallic species dispersed evenly within the mesoporous silica matrix. Dry reforming and reduction-oxidation cycling was undertaken with the materials. Catalysts with high content of nickel showed good activity during dry reforming, with conversions rates close to equilibrium in equimolar conditions. Insignificant deactivation of the catalysts was observed over 5 h and 50 h of reaction at 900 °C. Syngas production via reduction–oxidation cycling was shown to be insignificant as compared to continuous catalytic reforming.

MnFe2O4@SiO2@CeO2 core–shell nanostructures for applications in water remediation

“…It is well know that mesoporous silica can be prepared by adding CTAB to the basic reaction solution prior to TEOS addition, which can then be calcined 38 or washed 39 to remove residue CTAB. The addition of a porous silica shell to improve adsorption is a possible modification that could be done as future work.…”

Biofuels and Nanocatalysts: Python Boosting Visualization of Similarities

“…As they usually are magnetizable species, NCs are easily separable from the reaction medium due to their insolubility [ 23 ]. According to the existing literature [ 24 , 25 , 26 ], relevant examples of NCs include nanoparticles containing cobalt [ 27 , 28 , 29 , 30 , 31 ], gold [ 32 , 33 , 34 ], iron [ 35 , 36 , 37 , 38 , 39 , 40 ], nickel [ 41 , 42 , 43 , 44 ], palladium [ 45 , 46 , 47 , 48 , 49 , 50 ], and platinum [ 42 , 51 , 52 , 53 ]. Among the most diverse uses of NCs are biodiesel production [ 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 ], dyeing [ 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 …”