Search Results

You are looking at 1 - 3 of 3 items for :

  • "carbon dioxide conversion" x
Clear All

. 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 carbon dioxide conversions more than 25 m 2 /g and ca. 15 %, respectively, without

Restricted access

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.

Open access
Reaction Kinetics, Mechanisms and Catalysis
Authors: Leonardo Maciel, Aleksándros de Souza, Valderio Cavalcanti-Filho, Augusto Knoechelmann and Cesar de Abreu

Abstract  

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.

Restricted access