Authors:Heondo Jeong, Churl Hee Cho and Tae Hwan Kim
. The catalytic performance was decreased in the order of Cu/ZnO/ZrO 2 /Al 2 O 3 > Cu/ZnO/Al 2 O 3 > Cu/ZnO. The Cu/ZnO/ZrO 2 /Al 2 O 3 catalyst showed Cu 0 area and carbondioxideconversions more than 25 m 2 /g and ca. 15 %, respectively, without
Authors:Gellért Sipos, Tamás Bihari, Dorottya Milánkovich and Ferenc Darvas
For successful deep space exploration, a vast amount of chemistry-related challenges has to be overcome. In the last two decades, flow chemistry has matured enough to take the lead in performing chemical research in space. This perspective article summarizes the state of the art of space chemistry, analyzes the suitability of flow chemistry in extraterrestrial environment, and discusses some of the challenges and opportunities in space chemistry ranging from establishing an end-to-end microfactory to asteroid mining.
Authors:Leonardo Maciel, Aleksándros de Souza, Valderio Cavalcanti-Filho, Augusto Knoechelmann and Cesar de Abreu
The conversion of natural gas was carried out via tri-reforming of methane in a fixed bed reactor employing a Ni/γ-Al2O3 catalyst. The kinetic evaluations were performed in a temperature range from 923 to 1,123 K under atmospheric pressure. The
effects due to water and oxygen addition to the feed of the process were examined in terms of the yields of hydrogen and carbon
monoxide. Contributions of the reverse water–gas shift and oxidation reactions were evaluated. At temperatures above 1,000 K,
methane and carbon dioxide conversions of 97.35 and 46.75% produced hydrogen and carbon monoxide with yields of 37.35 and
4.99%, respectively. A model was proposed to describe the kinetic behavior of the process considering the proposition of a
four step reaction mechanism. The solutions of the equations of the model established predictions in terms of reactant and
products concentration evolutions. The model predictions indicated that for operations at 1,123 K and 1.0 bar, with low spatial
times (τ < 2.0 kg s/m3), a hydrogen yield as high as 75% was obtained.