Engineering stable Pt nanoclusters on defective two-dimensional TiO2 nanosheets by introducing SMSI for efficient ambient formaldehyde oxidation

Pt/Al2O3 catalysts showing excellent activity and stability have been used in various reactions, including HCHO oxidation. Herein, we prepared Pt-Na/Al2O3 catalysts with a Pt content of 0.05 wt % to reveal the key factors determining the anchoring of Pt as well as the catalytic activity and mechanism of HCHO oxidation. Pt-Na/nano-Al2O3 (denoted as Pt-Na/nAl2O3) catalysts with 0.05 wt % Pt content could completely oxidize HCHO to CO2 at room temperature, which is the lowest Pt content used in HCHO catalytic oxidation to our knowledge. After Na addition, terminal hydroxyl groups (denoted as HO-μter) on nano-Al2O3 were transformed to doubly bridging hydroxyl groups between Na and Al (denoted as HO-μbri(Na-Al)), which atomically dispersed Pt species. Pt anchoring further promoted the regeneration of HO-μbri(Na-Al) by activating O2 and H2O, oxidizing HCHO to CO2 directly by the fast reaction step ([HCOO-] + [OH]a → CO2 + H2O). Our study revealed that the HO-μbri(Na-Al) synergistically generated by HO-μter and Na species provided anchoring sites for Pt species.

Effect of Hydroxyl Groups on Metal Anchoring and Formaldehyde Oxidation Performance of Pt/Al2O3.

Gaseous formaldehyde adsorption by eco-friendly, porous bamboo carbon microfibers obtained by steam explosion, carbonization, and plasma activation

Formaldehyde (HCHO), which is one of the common pollutants in indoor environment and industrial processes, can cause adverse effects on human health. The thermal catalytic oxidation technology is regarded as the most promising approach due to its easy handling and environmental friendliness. This article reviews the current status of the catalytic oxidation of HCHO over noble metal and transition metal oxide catalysts. The general feature and the reaction mechanism of the catalytic oxidation of HCHO are summarized first. Based on the discussion of the reaction mechanism, the influence of some factors (catalyst preparation process, catalyst support, promoter and morphology) on the activity of the catalyst have been addressed. The structure of the catalysts has been elucidated and correlated with the reaction mechanism as well as the catalytic performance. Finally, the perspectives for the catalytic oxidation of HCHO in future research are presented. Hopefully, this review can shed light on the design of more active catalysts for HCHO oxidation to realize their practical application. 

The current status of research on the catalytic oxidation of formaldehyde

CE Doped Sno/Sno2 Heterojunctions for Highly Formaldehyde Gas Sensing at Low Temperature

Development of the environment-tolerant catalyst can contribute to pollutant treatment in extreme environment. In the present work, precursor of the silicate-decorated titania (SiOx-TiO2) was prepared by incorporating silica into hydrothermal synthesis of TiO2 nanowire (TNT). After loading Pt nanoparticles by impregnation, the as-prepared catalyst (Pt/SiOx-TiO2) possessed 7.2 times and 13.6 times the HCHO decomposition rate of Pt/TNT and conventional Pt/TiO2, respectively, at the temperature of 30 °C and the relative humidity of ∼5 %. Structure-performance relationship analyses showed that the excellent catalytic performance of Pt/SiOx-TiO2 was closely related to the presence of silicate and formation of sodium-stabilized Pt nanoparticles. The heterogeneously decorated silicate in Pt/SiOx-TiO2 had the excellent ability of capturing water from environment and even from HCHO decomposition itself. Consequently, the sodium-stabilized Pt nanoparticles of Pt/SiOx-TiO2 could be maintained in a wet microenvironment to exhibit the excellent HCHO decomposition performance in low temperature and dry environment.

Enhanced catalytic decomposition of formaldehyde in low temperature and dry environment over silicate-decorated titania supported sodium-stabilized platinum catalyst

Cellulose triacetate (CTA) was first applied as the catalytic support to load Pt nanoparticles for low-temperature formaldehyde (HCHO) decomposition. The room-temperature HCHO decomposition rate of...

Excellent Low-Temperature Formaldehyde Decomposition Performance over Pt Nanoparticles Directly Loaded on Cellulose Triacetate

The invention discloses high-activity sulfuric acid promoted solid super-strong composite acid and a preparation method thereof The high-activity sulfuric acid promoted solid super-strong composite acid is composed of a sulfuric acid promoted solid super-strong acid (SO4 /MxOy) and an auxiliary acid, and the mass content of sulfate radicals in the sulfuric acid promoted solid super-strong acidis 01%-10%; the auxiliary acid comprises at least one of hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, chloric acid, perchloric acid, hypochlorous acid and nitric acid, and the molar ratio of the auxiliary acid to sulfate radicals is 001-10 The invention provides a method for compounding the auxiliary acid onto the sulfuric acid promoted solid super-strong acid, so that compared with the sulfuric acid promoted solid super-strong acid, HZSM-5 solid acid, Amberlyst-15 solid acid and liquid sulfuric acid under the same conditions, the catalytic performance of the sulfuric acid promoted solid super-strong composite acid is remarkably improved in alkylation reaction and isomerization reaction The preparation method of the novel high-activity solid super-strong composite acid is simple, important significance for high-efficiency acid catalysis is achieved

High-activity sulfuric acid promoted solid super-strong composite acid and preparation method thereof

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Enhanced catalytic decomposition of formaldehyde in low temperature and dry environment over silicate-decorated titania supported sodium-stabilized platinum catalyst

Excellent Low-Temperature Formaldehyde Decomposition Performance over Pt Nanoparticles Directly Loaded on Cellulose Triacetate

High-activity sulfuric acid promoted solid super-strong composite acid and preparation method thereof