Platinum‐Supported Zirconia Nanotube Arrays Supported on Graphene Aerogels Modified with Metal–Organic Frameworks: Adsorption and Oxidation of Formaldehyde at Room Temperature

Abstract

Precious-metal catalysts (e.g.,A u, Rh, Ag, Ru, Pt, and Pd)s upported on transition-metal oxides (e.g.,A l 2 O 3 , Fe 2 O 3 ,CeO 2 ,ZrO 2 ,Co 3 O 4 ,MnO 2 ,T iO 2 ,and NiO) can effectively oxidize volatile organic compounds. In this study,p orous platinum-supported zirconia materials have been prepared by a" surface-casting" method.T he synthesized catalysts presenta no rdered nanotube structure and exhibited excellent performance toward the catalytic oxidation of formaldehyde. Af acile method, utilizing ab oilingw ater bath, was used to fabricate graphene aerogel (GA), and the macroscopic 3D Pt/ZrO 2 -GA was modified by introducing an adjustable MOF coating by as urfaces tep-by-stepm ethod.T he unblocked mesoporous structure of the graphene aerogel facilitates the ingress and egress of reactants and product molecules. The selected 7wt.% Pt/ZrO 2 -GA-MOF-5 composite demonstrated excellent performance for HCHO adsorption. Additionally,t his catalysta chieved around 90 %c onversion when subjectedto ar eaction temperature of 70 8C (T 90 % = 70 8C). The Pt/ZrO 2 -GA-MOF-5c omposite induces a catalytic cycle, increasing the conversion by simultaneously adsorbing and oxidizing HCHO. Thisw ork providesasimple approacht oi ncreasing reactantc oncentration on the catalyst to increase the rate of reaction.

Flower-like Pt/Fe2O3–CeO2 Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

“…In those methods based on oxidation, such as thermal incineration, catalytic oxidation, photocatalytic decomposition, biological degradation, ozone catalytic oxidation, and non-thermal plasma catalytic oxidation, VOCs are usually converted to water and carbon dioxide. 3 Among these methods, catalytic oxidation is considered to be an effective way to convert low-concentration toluene (<1000 ppm) to H 2 O and CO 2 at relatively low temperatures without secondary pollution. 1 Catalytic oxidation is widely applied because it not only lowers the activation energy of the redox reaction, thus reducing energy consumption, but also meets the requirements of environmental protection.…”

“…Owing to the awareness of environmental consciousness, various technologies have been developed to reverse the disturbing trend of VOC emissions in recent years. In those methods based on oxidation, such as thermal incineration, catalytic oxidation, photocatalytic decomposition, biological degradation, ozone catalytic oxidation, and non-thermal plasma catalytic oxidation, VOCs are usually converted to water and carbon dioxide . Among these methods, catalytic oxidation is considered to be an effective way to convert low-concentration toluene (<1000 ppm) to H 2 O and CO 2 at relatively low temperatures without secondary pollution .…”

Graphene-Based Metal–Organic Framework Hybrids for Applications in Catalysis, Environmental, and Energy Technologies

“…In addition, catalytic oxidation reactions are important in the production of various bulk chemicals. Graphene@MOF hybrids have therefore been investigated as potential catalysts for the oxidative degradation of pollutants such as p -hydroxybenzoic acid (PHBA), CO, formaldehyde, phenol, and 2,4-dichlorophenol. − Hybrids of this type have also been used to catalyze the oxidation of benzyl alcohol to the industrially important chemical benzaldehyde …”

“…A similar system was studied by Tan et al, whose work focused on Pt-and GO-based composite gels coated with MOF-5. 400 Briefly, SBA-15-OH (hydroxyl-modified Santa Barbara Amorphous Type Material-15, mesoporous silica) was used as a template for the synthesis of Pt-supported zirconium oxide (Pt/ ZrO 2 ) by a surface-casting technique. Pt/ZrO 2 was then converted into the Pt/GA aerogel via a self-assembly reaction with GO followed by freeze drying.…”

Practical MOF Nanoarchitectonics: New Strategies for Enhancing the Processability of MOFs for Practical Applications

“…Many other types of hydrogels and aerogels have been utilized to prepare 3D MOF composites (Table ). − …”