Surface sodium functionalization of ordered mesoporous Co₃O₄ controls the enhanced simultaneous catalytic removal of soot and NOx

Abstract

We demonstrate a simple surface sodium functionalization effect introduced during silica removal step for controlling the enhanced simultaneous catalytic removal of soot and NOx by ordered mesoporous Co3O4.

Novel natural manganese ore NH3‐SCR catalyst with superior alkaline resistance performance at a low temperature

“…According to the International Union of Pure and Applied Chemistry (IUPAC) classification, the three catalysts exhibit the Type IV isotherms with a H1 hysteresis loop (shown in Figure ), indicating that they possess cylindrical pore geometry with a high degree of pore size uniformity. This is consistent with the results of Schill et al Table reveals that the specific surface area of fresh catalyst is larger than those of K‐poisoned catalysts, and it decreases with the increase of the content of K. It is one of the reasons to decrease the NO x conversion of catalyst. Figure illustrates the pore size distribution curves of the K‐poisoned and fresh catalysts by the BJH method.…”

Effect of Mn addition on the low‐temperature NH3‐selective catalytic reduction of NOx over Fe2O3/activated coke catalysts: Experiment and mechanism

“…As discussed above (Sections 3.1.3 and 3.1.4), the 8Mn6Fe/AC catalyst has the capacity to adsorb gaseous NH 3 and NO x on the catalyst surface. The gaseous NH 3 can be adsorbed and activated on the surface acid sites of the catalyst and then reacts with gaseous NO x or adsorbed NO x ; that is, both the Langmuir–Hinshelwood (L‐H) mechanism and Eley–Rideal (E‐R) mechanism may contribute to the NO x reduction over 8Mn6Fe/AC catalyst (shown in Figure ) …”

“…The gaseous NH 3 can be adsorbed and activated on the surface acid sites of the catalyst and then reacts with gaseous NO x or adsorbed NO x ; that is, both the Langmuir-Hinshelwood (L-H) mechanism and Eley-Rideal (E-R) mechanism may contribute to the NO x reduction over 8Mn6Fe/AC catalyst (shown in Figure 13). [55][56][57][58] The NO x reduction over 8Mn6Fe/AC catalyst via the L-H mechanism can be approximately explained by reactions (2)…”

Surface Modification of Cobalt‐Manganese Mixed Oxide and Its Application for Low‐Temperature Propane Catalytic Combustion

“…[11] Wagloehner et al [12] prepared a series of MnO x with different oxidation states including MnO 2 , Mn 3 O 4 and Mn 2 O 3 for the catalytic oxidation of soot, finding that constructing nanorods Mn 3 O 4 by flame spray pyrolysis was beneficial to improve catalytic performance and stability. Meanwhile, Co 3 O 4 was used as quite competitive catalyst for catalytic combustion of CO, [13] CH 4 , [14] soot, [15] and VOCs. [16] Hu et al [17] investigated Co 3 O 4 with nanostructures exposed various crystal surfaces for the removal of methane, and found that Co 3 O 4 sheets with (112) facets manifested better catalytic activity than Co 3 O 4 belts with (011) facets and Co 3 O 4 cubes with (001) facets.…”

“…prepared a series of MnO x with different oxidation states including MnO 2 , Mn 3 O 4 and Mn 2 O 3 for the catalytic oxidation of soot, finding that constructing nanorods Mn 3 O 4 by flame spray pyrolysis was beneficial to improve catalytic performance and stability. Meanwhile, Co 3 O 4 was used as quite competitive catalyst for catalytic combustion of CO, [13] CH 4 , [14] soot, [15] and VOCs [16] . Hu et al [17] .…”