Vacancy engineering of the nickel-based catalysts for enhanced CO2 methanation

Revealing the dependence of CO2 activation on hydrogen dissociation ability over supported nickel catalysts

“…This agrees with the literature that the formate mechanism is kinetically unfavorable due to the involvement of multiple thermodynamically stable intermediates. 11,28,29 Furthermore, it is found that the formation of CO and CH 4 over the 40Ni catalyst has an almost identical activation barrier ($74 kJ/mol). Such an observation provides evidence that the production of CH 4 is likely the consequence of continuous hydrogenation of CO or shares the same intermediate with CO. [30][31][32] Our experimental findings lead to a series of discussions that incorporate literature with computational predictions summarized in Table S5.…”

“…An in-depth understanding of the CO 2 hydrogenation process, especially the CO 2 activation step over nickel, will shed light on the rational design of robust catalysts for efficient CO 2 conversion. 11 During the CO 2 hydrogenation reaction over nickel catalysts, H 2 dissociates on the metallic Ni particles and then reacts with the oxygen or carbon-containing species, yielding various reactive intermediates. 12,13 The ability of a catalyst to dissociate hydrogen molecules has, therefore, usually been considered to be essential to determine the mechanism and kinetics of CO 2 hydrogenation reaction over supported nickel catalysts.…”

Challenges and prospects in the selective photoreduction of CO2 to C1 and C2 products with nanostructured materials: a review

“…An important and excellent example consists of a detailed setup and method via a GC system equipped with TCD and FID detectors and a Ni catalyst methanizer to identify CO 2 -photoreduced products in liquids and gas-phase systems. 177,178 The FID detector destroys the CO 2 -reduced gaseous product, and hence it is essential to analyze the CO 2 -reduced products preferentially through a TCD detector before the FID detector for the quantification of gases. GC-MS analysis confirms the various CO 2 -reduced products.…”

An air-stable, reusable Ni@Ni(OH)2nanocatalyst for CO2/bicarbonate hydrogenation to formate

“…9, 37, 38 Ni is well-known for CO 2 hydrogenation into methane, and also widely used in converting CO 2 and methane into syngas at high temperatures. [39][40][41][42][43] There is very limited research, however, exploring Ni-promoted hydrogenation of CO 2 /bicarbonate into formate. 9,[44][45][46] Using Raney Ni as catalyst in the presence of amines, Farlow and Adkins observed the formation of amine/formic acid adducts from CO 2 and H 2 .…”