Investigation of catalysts M/CeO2 (M = Pt, Rh, or Pd) for purification of CO2 derived from oxycombustion in the absence or presence of water

Abstract

Oxyfuel combustion is a promising technology to produce a CO 2 rich flue gas ready suitable for sequestration or valorization. But its storage as well as its further valorization requires to increase the CO 2 purification as a small amount of CO and NOx are produced during combustion. Based on the technology developed for three-way converters, similar systems i.e M/CeO 2 where M is Pt, Pd or Rh were studied for NO-CO abatement in a gas stream similar to those obtained when an oxyfuel combustion is performed. The results evidenced that the role of the metal nature influences the performances obtained on NO-CO abatement, platinum supported on ceria being the most efficient catalyst. We also measured the impact of the presence of water in the reaction stream on the catalytic activity of these materials. It appears that the presence of water has a beneficial effect on the different reactions due to a water gas shift reaction that increases the reduction of the NO and favors the formation of N 2 . The study pointed out that platinum supported on ceria remained the best catalyst, under these wet operating conditions close to industrial ones, for purification of oxyfuel combustion exhausts.

Catalytic wet peroxide degradation of acrylonitrile wastewater by ordered mesoporous Ag/CeO2: synthesis, performance and kinetics

“…Metal or metal oxide supported on CeO 2 carrier by impregnation method, or doped in the lattice of CeO 2 in the form of metal cation to form metal-Ce solid solution, which can improve the catalytic performance of the catalyst. [24][25][26] Compared with platinum, palladium, gold and other precious metals, silver is stable and relatively cheaper, which makes silver more practical in industrial applications. 25,27 In particular, silver nanoparticles have been proved to be promising catalysts, and many excellent catalysts based on silver nanoparticles have been reported, such as Ag/TiO 2 , 28,29 Ag/SBA-15, 30,31 Ag/Al 2 O 3 , 32,33 Ag/g-C 3 N 4 (ref.…”

The microstructural refinement and performance improvement of a nanoporous Ag/CeO2 catalyst for NaBH4 oxidation

“…The Ag δ+ in the samples could participate in the NaBH 4 oxidization reaction according the work [41,42], which was very beneficial to improve the catalytic activity. It is well known that the interaction between noble metals and CeO 2 results in an obvious increase in catalytic performance [19,22]. Thus, the transport of electrons may be easier due to interaction between Ag and Ce nanorods [19,43] when CeO 2 with a small fraction is distributed among Ag ligaments (figure 8).…”

“…Moreover, CeO 2 can form nanorods because it preferentially crystallizes in a particular direction during some preparation processes; these nanorods increase the beneficial effects [20,21]. Therefore, the adoption of CeO 2 nanorods in nanocomposite catalysts has been increasingly studied [22].…”

Synthesis, Characterization, and Polishing Properties of a Lanthanum Cerium Fluoride Abrasive

“…Ceria (CeO 2 ) is an important rare earth functional material, which is widely used in solid oxide fuel cells, oxygen sensors, catalysts, ultraviolet absorbents and filters, luminescent materials, and polishing media in micro-electronics [1][2][3][4][5][6][7]. In modern manufacturing, the glass substrates' global planarity is usually achieved by using chemical mechanical polishing (CMP) technology [8].…”