MnOx-decorated VOx/CeO2 catalysts with preferentially exposed {110} facets for selective catalytic reduction of NOx by NH3

Highly stable phosphine modified VOx/Al2O3 catalyst in propane dehydrogenation

“…After phosphine modification of catalysts, newly formed phosphorus species replaced partially polymerized vanadia species anchored on alumina surface. This is also confirmed by the presence of a new band at 1015cm -1 , characteristic of V=O stretching mode in isolated tetrahedral-coordinated VO4 [14,35,36,38,39], indicating the presence of more isolated vanadium species. Besides, the strong band at 923 cm -1 could be ascribed to asymmetric P-O-P vibrations of P2O7 2-[40-42], while the rather weak band from 1140 cm -1 to 1180 cm -1 is attributed to the V-O-P stretching of (VO)2P2O7 as suggested by Wu et.al [42], indicating the existence of very small amount of VPO species.…”

“…5 shows the Raman spectra of different samples. For parent catalyst, a relatively sharp band in the range of 950-1050 cm -1 is observed, which is ascribed to V=O stretching vibration, indicating existence of isolated and polymerized vanadium species [34][35][36]. Broad Raman band in the range 500-950 cm -1 can be attributed to V-O-V stretching and V-O-Al antisymmetric/symmetric stretching vibrations in polymerized VOx [22,35].…”

“…7 demonstrates binding energies of vanadium atoms with different valences. The characteristic V 2p3/2 peak was fitted and deconvoluted into 2 peaks for fresh catalysts ascribed to pentavalent and tetravalent vanadium oxidation states [14,35,36]. Trivalent vanadium species were not taken into consideration since the reduction temperature of pentavalent vanadium to trivalent vanadium is usually above 773K under reduction atmosphere [48] (PH3 surface modification of sample was conducted at 573K for 1 h).…”

Decoupling the Impacts of Engineering Defects and Band Gap Alignment Mechanism on the Catalytic Performance of Holey 2D CeO2−x‐Based Heterojunctions

“…The importance of nanoscale architecture has been highlighted by the recent emergence of the outstanding catalytic performance of nanosheets of various systems owing to the high densities of active sites deriving from their high surface areas. [6][7][8][9][10] State-of-the-art heterojunctions based on nanosheet-structured oxides recently have shown great promise in energy and environmental applications. However, there are only a limited number of reports of these materials since most such structures are not inherently 2D (Table S1, Supporting Information).…”

Hydrochloric Acid‐Assisted Regeneration of Cobalt Ethylenediamine for NOx Remediation in Flue Gas

“…Some of the popular methods for the denitrification of exhaust gases include selective catalytic and noncatalytic reduction, adsorption-based methods, and plasma-based methods [13,14]. Apart from wet denitration, several new technologies have been developed, such as complexation absorption, oxidation absorption, reduction absorption, and biological methods [15][16][17][18][19][20]. Among these methods, the complexation absorption method is considered as one of the most promising technologies for efficient wet denitrification [18][19][20].…”