다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Promoting effects of acid enhancing on N2 selectivity for selectivity catalytic oxidation of NH3 over RuOx/TiO2: The mechanism study

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.

The superior performance of dichloromethane oxidation over Ru doped sulfated TiO2 catalysts: synergistic effects of Ru dispersion and acidity

Mesoporous TiO2(B) whisker was firstly applied as a support for synthesizing the novel sulfated solid superacid (SO42−/TiO2(B)). According to NH3-TPD, TG and Py-IR characterization results, it was found that the similar amount of sulfate group on TiO2(B) and anatase showed significantly different acid characteristics and catalytic performances. The total acid amount of SO42−/TiO2(B) was about 1.8 times as anatase-supported sulfated solid superacid (SO42−/Anatase). Simultaneously, the SO42−/TiO2(B) possessed higher percentage of Bronsted acid and more weak-medium acid strength than SO42−/Anatase. These acidic properties endowed SO42−/TiO2(B) with the increased esterification reaction rate and decreased alkylation byproduct selectivity compared with that of SO42−/Anatase. Structure-performance analysis exhibited that there were more bridged bidentate sulfate groups coordinated to the TiO2(B) in SO42−/TiO2(B), which could induce more Ti cations than that of the chelating one. This was the key factor to be responsible for the unique acid characteristics of SO42−/TiO2(B). The present work provides a novel solid superacid and might open a strategy to mediate the acid characteristic for sulfated solid superacid.

/pdf/novel-mesoporous-tio2-b-whisker-supported-sulfated-solid-eh7ocuw3g2.pdf

Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances

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

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Novel mesoporous TiO2(B) whisker-supported sulfated solid superacid with unique acid characteristics and catalytic performances

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