Mono- and bimetallic metal catalysts based on Ni and Ru supported on alumina-coated monoliths for CO2 methanation

A bimetallic catalyst consisting of Ni nanoparticles interspersed with atomic Ru on alumina coated monolith afforded higher activity than other mono and bimetallic catalysts in CO2 methanation, providing low pressure drop at high space velocity.

A CeO2/ZrO2-TiO2 Catalyst for the Selective Catalytic Reduction of NOx with NH3

In this study, CeZr0.5TiaOx (with a = 0, 1, 2, 5, 10) catalysts were prepared by a stepwise precipitation approach for the selective catalytic reduction of NOx with NH3. When Ti was added, all of the Ce-Zr-Ti oxide catalysts showed much better catalytic performances than the CeZr0.5Ox. Particularly, the CeZr0.5Ti2Ox catalyst showed excellent activity for broad temperature range under high space velocity condition. Through the control of pH value and precipitation time during preparation, the function of the CeZr0.5Ti2Ox catalyst could be controlled and the structure with highly dispersed CeO2 (with redox functions) on the surface of ZrO2-TiO2 (with acidic functions) could be obtained. Characterizations revealed that the superior catalytic performance of the catalyst is associated with its outstanding redox properties and adsorption/activation functions for the reactants.

An investigation on the influence of catalyst composition, calcination and reduction temperatures on Ni/MgO catalyst for dry reforming of methane

Catalytic activity of Ni/MgO catalyst investigated at different Ni content (20, 40 and 80 wt%), calcination (450, 600 and 800 °C) and reduction temperatures (550 and 800 °C) for dry reforming reaction at very high space velocity.

Influence of aging on in situ hydrothermally synthesized Cu-SSZ-13 catalyst for NH3-SCR reaction

Cu-SSZ-13 crystallized for 72 h shows excellent hydrothermal stability, NOx removal activity and N2 selectivity even under high space velocity (640 000 h−1). Aging treatments lead to the transform of some Cu species from isolated Cu2+ to new complexes and dealuminization of the zeolites framework, contributing to catalyst deactivation.