Selective Hydrogenation Properties of Ni-Based Bimetallic Catalysts

Abstract

Metallic Ni shows high activity for a variety of hydrogenation reactions due to its intrinsically high capability for H2 activation, but it suffers from low chemoselectivity for target products when two or more reactive functional groups are present on one molecule. Modification by other metals changes the geometric and electronic structures of the monometallic Ni catalyst, providing an opportunity to design Ni-based bimetallic catalysts with improved activity, chemoselectivity, and durability. In this review, the hydrogenation properties of these catalysts are described starting from the typical methods of preparing Ni-based bimetallic nanoparticles. In most cases, the reasons for the enhanced catalysis are discussed based on the geometric and electronic effects. This review provides new insights into the development of more efficient and well-structured non-noble metal-based bimetallic catalytic systems for chemoselective hydrogenation reactions.

CO2 to Value-Added Chemicals: Synthesis and Performance of Mono- and Bimetallic Nickel–Cobalt Nanofiber Catalysts

“…These findings underscore the key principle that introducing an additional active metal to Ni can modulate its electronic properties, subsequently leading to an improvement in adjusting the Ni valence state for catalysis [26,27]. Bimetallic structures containing Ni have also been researched for their potential in modifying the selectivity of CO 2 hydrogenation [28]. Reddy et al unveiled that adjusting Cu/Ni molar ratios enhanced CO 2 hydrogenation selectivity, as the formation of a Cu-Ni alloy due to Cu core atoms migrating to the Ni surface increases CO desorption and suppresses methane production, thereby elucidating the potential to regulate CO 2 hydrogenation selectivity through managing the electronic structure of the Ni surface [29].…”