Synthesis and Characterization of New Material‐‐La/Zr/MMT Employed in Acetone Oxidation

Abstract

A new material of zirconium pillared montmorillonite added with lanthanum (denoted as La/Zr/MMT) was prepared for acetone oxidation. Surface properties of the catalysts were investigated by means of XRD, TEM, TG-DTA and BET methods. The XRD result indicated that the interlayer space of the montmorillonite was enlarged from 1.57 to 4.85 nm after the treatment with zirconium pillaring and the addition of lanthanum. N 2 adsorption-desorption result showed that by the process of zirconium pillaring, the specific surface area of the sample was increased to 128.0 m 2 /g, which was two times almost as large as pure montmorillonite. Simultaneously, the thermal stability was also enhanced. The activity of the new material on the total oxidation of acetone was investigated, and the results indicated that the catalytic activity of the montmorillonite was greatly improved. Over the sample of La/Zr/MMT, the T 98 of acetone was obtained at 350 , while it needs 400 ℃ over the pure montmorillonite. ℃ After 0.1% Pd was supported on the sample of La/Zr/MMT, the T 98 decreased from 350 to 280 ℃, indicating the montmorillonite is a promising material for the control of some types of the volatile organic compounds such as acetone.

Preparation and Characterization of the Antibacterial Zn2+ or/and Ce3+ Loaded Montmorillonites

“…[1][2][3] There are many papers reporting the antibacterial activity of modified montmorillonites. Ōya et al 4 have prepared thin film and fine particles from Ag ＋ -exchanged montmorillonite sol and the resulting specimens exhibited strong antimicrobial activity and antifungal activity.…”

“…Moreover, the antibacterial activity of Na/MMT and the modified montmorillonites was evaluated. 3 •6H 2 O, respectively, were weighed. Each sample was dissolved in 300 mL of deionized water for 0.5 h at 60 ℃, and 6.0 g of Na/MMT was dispersed in it by mixing for 1.0 h at 70 ℃.…”

Preparation and characterization of antibacterial Zn2+-exchanged montmorillonites

“…Sodium montmorillonite (Na-MMT) is a subset of aluminosilicate clay with a 2︰1 layer structure containing exchangeable hydrated cations of Na ＋ and Ca 2＋ and has the potential to be used as carrier for functional materials because of its high exchange capability and excellent absorptive performance [7,8] . Zhou et al have prepared Cu 2+ -exchanged montmorillonite possessing powerful antibacterial property [9] .…”

Role of Cryptomelane in Surface-Adsorbed Oxygen and Mn Chemical Valence in MnOx during the Catalytic Oxidation of Toluene

“…Volatile organic compounds (VOCs) are the main air pollutants in today’s society, which are harmful to the human health and environment. , There are many ways to remove VOCs, such as adsorption, thermal combustion, catalytic combustion, and using biofilms. − Among these removal techniques, catalytic combustion is one of the promising methods for removing VOCs because of its high efficiency, low temperature, and low cost . Although precious metal catalysts showed excellent catalytic performance, high price and easier sintering limited its further applications. , In contrast, transition metal catalysts have attracted widespread attention because of their lower cost and splendid stability. , …”