SBA‐15‐Supported Metal Silicides Prepared by Chemical Vapor Deposition as Efficient Catalysts Towards the Semihydrogenation of Phenylacetylene

Abstract

Metal silicide (Pd2Si, Ni2Si, CoSi, FexSi, and Cu6.69Si) catalysts supported by SBA‐15 have been prepared by a chemical vapor deposition method under a H2 atmosphere using (CH3)2SiCl2 as the Si source. Of the SBA‐15‐supported metal silicide catalysts, Ni2Si/SBA‐15 presented a modest activity, notable selectivity to styrene (>90 %), and high stability with respect to the selective hydrogenation of phenylacetylene, which is attributed to the active‐site isolation and electron transfer in the silicide. Furthermore, Ni2Si/SBA‐15 also has a high selectivity to diphenylacetylene and 1,4‐butynediol, which demonstrates that Ni2Si/SBA‐15 is a promising, low‐cost catalyst alternative to noble‐metal catalysts as a selective hydrogenation catalyst.

One‐step Modification of Active Sites and Support in Ni/Al2O3 Catalyst for Hydrodeoxygenation of Lignin‐derived Diphenyl Ether

“…It is consistent with the XPS results. All these results indicate a strong interaction between Ni and Si leading to a slight transfer of electron from the metal to silicon, which would have big influence on the catalytic property of Ni ,…”

“…In the case of Ni/Al 2 O 3 , the conversion of DPE decreases from 60% to 41% after 30 h running, with a 47% BEN selectivity and more than 40% CHN selectivity, which would cause higher H 2 consumption (Figure b). It is important to note that the active‐site isolation by Si element and electron transfer between Ni and Si atoms, which would decrease the activation capacity of H 2 and aromatic ring, contribute to the selectivity to the desired product and the catalytic activity ,. As shown in Figure S4, the area of H 2 desorption over Ni 2 Si/SiO 2 ‐Al 2 O 3 is much smaller than that over Ni/Al 2 O 3 catalyst, indicating the reduction on surface of H atom concentration due to the decrease of Ni sites, which means that the H 2 activation capacity of Ni 2 Si/SiO 2 ‐Al 2 O 3 is inferior compared to that of Ni/Al 2 O 3 .…”

Metal–Organic Frameworks Encapsulating Active Nanoparticles as Emerging Composites for Catalysis: Recent Progress and Perspectives

“…Until now there are more than 20 000 MOFs reported and some of them exhibit intriguing catalytic performances via thermo‐, photo‐ or electrodriven modes, which are generally implemented by metal node, functional organic linker or both . As for metal nodes, they are commonly associated with transition metals that likely introduce Lewis acidity, since several coordination positions of the metal centers are often occupied by solvent molecules that can be removed by heating or evacuation while keeping their frameworks.…”

Intermetallic Nanocatalysts from Heterobimetallic Group 10–14 Pyridine-2-thiolate Precursors

“…41,42,43,44,45 Ni2Si and Pd2Si were investigated for HER, 46 and for selective phenylacetylene hydrogenation. 47 Recently, ternary silicide intermetallics such as LaScSi, LaCoSi, and LnNiSi (Ln = La-Nb) have gathered attention due to their ability to act as electrides-compounds which have anionic-like electrons localized in interstitial sites-which renders them useful in hydrogen storage as well as in catalytic ammonia synthesis at moderate temperature (400 °C) and pressure (1 atm). 48,49,50,51,52 While many high temperature solid state methods to synthesize intermetallic compounds exist, low-temperature solution-phase methods provide some advantages, for example in enabling the preparation of metastable phases, or of intermetallics with smaller particle sizes with increased surface areas for catalytic applications.…”