Pt/MnO₂ Nanoflowers Anchored to Boron Nitride Aerogels for Highly Efficient Enrichment and Catalytic Oxidation of Formaldehyde at Room Temperature

Abstract

The catalytic room temperature oxidation of formaldehyde (HCHO) is widely considered as a viable method for the abatement of indoor toxic HCHO pollution. Herein, Pt/MnO2 nanoflowers anchored to boron nitride aerogels (Pt/MnO2‐BN) were fabricated for the catalytic room temperature oxidation of HCHO. The three‐dimensional Pt/MnO2‐BN aerogels demonstrated superior catalytic activity as a result of the improved diffusion of the reactant molecules within the porous structure. Furthermore, the porous aerogels displayed excellent HCHO adsorption capacities, which promote a rapid HCHO gas‐phase concentration reduction and a subsequent complete oxidation of the adsorbed HCHO. The combined adsorption and oxidation properties of the Pt/MnO2‐BN aerogels enhance the oxidative removal of HCHO. The optimized Pt/MnO2‐BN demonstrated excellent catalytic activity toward HCHO (200 ppm) at room temperature, achieving a 96 % formaldehyde conversion after 50 min.

Investigation into the Phase–Activity Relationship of MnO2 Nanomaterials toward Ozone‐Assisted Catalytic Oxidation of Toluene

“…To further evaluate the oxygen vacancy density of these samples, electron paramagnetic resonance (EPR) was carried out (Figure 2C), whose signal intensity directly represents the content of oxygen defect in the catalyst. [ 53–55 ] The symmetrical EPR signal peak of each of the MnO 2 samples appears at g = 2.003 in Figure 2C, which can be ascribed to the oxygen vacancy with paramagnetic state. Notably, the EPR signal intensity followed the order of δ‐MnO 2 > α‐MnO 2 > ε‐MnO 2 > γ‐MnO 2 > λ‐MnO 2 > β‐MnO 2 , conforming that the oxygen vacancy density also followed this order, which is consistent with XPS results.…”

Lewis base sites of non-oxide supports boost oxygen absorption and activation over supported Pt catalysts

“…on the surface of the catalyst play a signicant role. [7][8][9][10] Platinumbased materials are efficient and widely used catalysts for HCHO oxidation because Pt 0 active sites can efficiently activate O-O bonds to produce surface oxygen species for promoting HCHO oxidation. [11][12][13] Unfortunately, as a precious metal, platinum's high cost limits its widely used, so improving catalytic performance and reducing usage are effective means to promote its industrial application process.…”

One-step fabrication of electrospun flexible and hierarchically porous Pt/γ-Al2O3 nanofiber membranes for HCHO and particulate removal

“…[5][6][7][8][9] Because more than 80% of the people spend their time in an indoor environment, removing indoor HCHO is of great importance to human health. Many approaches including adsorption, [10][11][12][13] photocatalysis, [14][15][16] plasma oxidation, [17][18][19] and thermal catalysis oxidation [20][21][22][23][24][25] have been adopted to eliminate indoor HCHO. In comparison with other approaches, catalytic oxidation of HCHO over supported noble metal catalytic materials at ambient temperature presents the most developing potential owing to its high efficiency in converting HCHO into CO 2 and H 2 O, environmental friendliness, and long life time.…”

“…27,[31][32][33][34][35][36][44][45][46][47] Hence, the fabrication of catalytic materials with high catalytic activity and high mass transmission efficiency attracts scientists' attention. To overcome the shortages of powder-like Pt catalysts, one of the strategies is to design monolithic Pt catalytic materials such as 3D Pt/MnO 2 nanoflowers anchored on BN aerogels, 22 flexible nickel foam decorated with Pt/NiO nanoflakes, 48 and 3D carbon foam supported MnO 2 /Pt 49 with a hierarchical porous structure, which benefits to maintain high catalytic activity and high mass transmission efficiency. 21,22,48 Due to their porous structure beneficial to the mass transfer process and high dispersion of Pt NPs, these composite catalytic materials showed a high catalytic efficiency at ambient temperatures for HCHO oxidation.…”

“…To overcome the shortages of powder-like Pt catalysts, one of the strategies is to design monolithic Pt catalytic materials such as 3D Pt/MnO 2 nanoflowers anchored on BN aerogels, 22 flexible nickel foam decorated with Pt/NiO nanoflakes, 48 and 3D carbon foam supported MnO 2 /Pt 49 with a hierarchical porous structure, which benefits to maintain high catalytic activity and high mass transmission efficiency. 21,22,48 Due to their porous structure beneficial to the mass transfer process and high dispersion of Pt NPs, these composite catalytic materials showed a high catalytic efficiency at ambient temperatures for HCHO oxidation. In addition, compared with powder-like catalysts, they are easier to be recycled due to their monolithic structure and large macro size.…”