“…The HDS was accompanied by a significant formation of an intermediate THT. This can be ascribed to hydrogenating character of supported metals at higher hydrogen pressure of 2 MPa [33,34]. It is worth to mention that THT amount was substantially lower on the catalysts of PdA-PtO series, giving a highest selectivity in desulfurized products, C 4 hydrocarbons.…”
Section: Activity In Hds Of Thiophene and Benzothiophenementioning
“…The HDS was accompanied by a significant formation of an intermediate THT. This can be ascribed to hydrogenating character of supported metals at higher hydrogen pressure of 2 MPa [33,34]. It is worth to mention that THT amount was substantially lower on the catalysts of PdA-PtO series, giving a highest selectivity in desulfurized products, C 4 hydrocarbons.…”
Section: Activity In Hds Of Thiophene and Benzothiophenementioning
“…[28] The Pt-Cl-400 sample shows very small Pt particles with an average size of about 0.6 nm ( Figure 4). [43][44][45] For the Pt-Cl-400 sample the E b (Pt4f 7/2 ) value for Pt 4 + -like component is a bit higher -74.9 eV. Treatment with H 2 at 250°C causes a negligible increase of the average particle size up to 0.8 nm with the preservation of highly dispersed Pt species.…”
Two series of Pt/γ-Al 2 O 3 catalysts for low temperature NH 3 oxidation were prepared using Pt(NO 3 ) 4 and H 2 PtCl 6 precursors. Using both precursors results in the formation of small Pt particles (d < 1.5 nm), however, Cl-containing Pt precursors give a higher fraction of highly dispersed Pt species. Such species show high stability against thermal or H 2 treatment probably due to the presence of a substantial amount of chlorine on the surface. Treatment of the samples prepared from Pt(NO 3 ) 4 with H 2 leads to the formation of metallic Pt nanoparticles accompanied by the improvement of catalytic activity in NH 3 oxidation at T < 200°C. The main products of ammonia oxidation at temperatures below 250°C were molecular nitrogen and nitrous oxide with the N 2 selectivity reaching 80 %. Operando XANES/ EXAFS revealed that even after H 2 pretreatment at least 40 % of Pt surface remains in oxidized state under reaction conditions resulting in the appearance of N 2 O as a by-product.
“…The existing methods of catalytic purification of flue gases from nitrogen oxides are based on NOx reduction by the following reducing agents: ammonia, hydrocarbons, carbon monoxide, etc. [15][16][17]. The literature analysis shows that the most promising catalytic systems are individual or mixed transition metal oxides.…”
Section: The Technology Used Equipment Results Of Testsmentioning
Results of development of technologies for purification of coal-fired power plants from nitrogen and sulfur oxides in the frame of Russian-Chinese Project No. 14.583.21.0004 are presented.
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