The accumulation of formaldehyde in mother liquor during glyphosate production can reduce product yield and limits mother liquor recycling.Pt/TiO2 catalysts for the oxidation of aqueous formaldehyde are prepared via NaBH4 reduction-deposition,incipient wetness impregnation,ammonia deposition,and improved NaBH4 reduction-deposition methods,respectively.These catalysts are characterized by means of XRD,TEM,and XPS.Experimental results demonstrate that the Pt/TiO2 catalyst prepared via the improved NaBH4 reduction-deposition method exhibits the best catalytic performance under 70℃ and 0.7 MPa reaction conditions,achieving a 99% of formaldehyde conversion within 20 min at a low Pt loading of 0.7%,while maintaining stable activity after five recycling cycles.Its superior performance can be attributed to its high metallic Pt0 content (Pt0/Pt ratio) and abundant surface oxygen defects.Kinetic analysis reveals an apparent activation energy of 52.3 kJ/mol for formaldehyde oxidation over this catalyst.
ZhangY, LiuS, WangJ, et al. Based on the internal electric field S scheme mesoporous g-C3N4 nanosheets supported 2H MoS2 heterostructures for HCHO degradation of interior decoration and organic dyes degradation[J]. Inorganic Chemistry Communications, 2024, 169:113047.
[5]
ZhengD, SunY, LiH, et al. Multistage A-O activated sludge process for paraformaldehyde wastewater treatment and microbial community structure analysis[J]. Journal of Chemistry, 2016, 2016(1):2746715.
[6]
SilvaA M T, Castelo-BrancoI M, Quinta-FerreiraR M, et al. Catalytic studies in wet oxidation of effluents from formaldehyde industry[J]. Chemical Engineering Science, 2003, 58(3/6):963-970.
[7]
FamY, ImaeT. Catalytic oxidation of formaldehyde in water by calcium phosphate-based Pt composites[J]. RSC Advances, 2015, 5(21):15944-15953.
WuX, SunS, WangR, et al. Pt single atoms and defect engineering of TiO2-nanosheet-assembled hierarchical spheres for efficient room-temperature HCHO oxidation[J]. Journal of Hazardous Materials, 2023, 454:131434.
[12]
ChenM, WangW, QiuY, et al. Identification of active sites in HCHO oxidation over TiO2-supported Pt catalysts[J]. ACS Catalysis, 2022, 12(9):5565-5573.
[13]
HuangH, LeungD Y C, YeD. Effect of reduction treatment on structural properties of TiO2 supported Pt nanoparticles and their catalytic activity for formaldehyde oxidation[J]. Journal of Materials Chemistry, 2011, 21(26):9647-9652.
ChenC, SewvandiG, KusunoseT, et al. Synthesis of {010}-faceted anatase TiO2 nanoparticles from layered titanate for dye-sensitized solar cells[J]. Crystengcomm, 2014, 16(37):8885-8895.
[16]
VikrantK, KimK H, DongF, et al. Deep oxidation of gaseous formaldehyde at room-temperature by a durable catalyst formed through the controlled addition of potassium to platinum supported on waste eggshell[J]. Chemical Engineering Journal, 2022, 428:131177.
[17]
SunH, ZhangP, WangJ, et al. Understanding the suppressive role of catalytically active Pt-TiO2 interfacial sites of supported metal catalysts towards complete oxidation of toluene[J]. Journal of Materials Chemistry A, 2022, 10(48):25633-25643.
[18]
WangZ, JinX, ChenF, et al. Oxygen vacancy induced interaction between Pt and TiO2 to improve the oxygen reduction performance[J]. Journal of Colloid and Interface Science, 2023, 650:901-912.
[19]
SharmaP, GuptaS, SinghR, et al. Hydrogen ion sensing characteristics of Na3BiO4-Bi2O3 mixed oxide nanostructures based EGFET pH sensor[J]. International Journal of Hydrogen Energy, 2020, 45(37):18743-18751.
[20]
QiL, ChengB, YuJ, et al. High-surface area mesoporous Pt/TiO2 hollow chains for efficient formaldehyde decomposition at ambient temperature[J]. Journal of Hazardous Materials, 2016, 301:522-530.
[21]
SongY, WuH, LiuY, et al. Oxygen vacancy regulated valence states of Pt on rutile TiO2 promote catalytic oxidation of HCHO[J]. Applied Catalysis A:General, 2023, 660:119186.
WangZ, WangW, ZhangL, et al. Surface oxygen vacancies on Co3O4 mediated catalytic formaldehyde oxidation at room temperature[J]. Catalysis Science & Technology, 2016, 6(11):3845-3853.
[24]
PengH, YingJ, ZhangJ, et al. La-doped Pt/TiO2 as an efficient catalyst for room temperature oxidation of low concentration HCHO[J]. Chinese Journal of Catalysis, 2017, 38(1):39-47.
MiyamotoH, YampolskiY, YoungC L. IUPAC-NIST solubility data series.103.Oxygen and ozone in water,aqueous solutions,and organic liquids (supplement to solubility data series volume 7)[J]. Journal of Physical and Chemical Reference Data, 2014, 43(3):033102.