Enhanced removal of toluene by dielectric barrier discharge coupling with Cu-Ce-Zr supported ZSM-5/TiO2/Al2O3

Abstract

Toluene was removed by dielectric barrier discharge coupling with Cu-Ce-Zr supported ZSM-5/TiO 2 /Al 2 O 3 catalysts. Copper, cerium, and zirconium species were highly dispersed on the support surface, and copper was mostly in Cu 2+ and Cu + state co-existed. The reaction process of toluene removal in the plasma-catalyst system was influenced by the support of the catalyst and it could be divided into three steps. Pure plasma and thermal catalytic chemistry triggered by background temperature played different roles in the different step. Large pore size, more oxygen vacancy and lattice oxygen in the CuCeZr/TiO 2 were responsible to the excellent toluene removal, CO 2 selectivity and energy yield.

Abatement of ammonia and butyraldehyde under non-thermal plasma and photocatalysis: Oxidation processes for the removal of mixture pollutants at pilot scale

“…Dielectric barrier discharge DBD-plasma as one of the NTP methods generated by electrical discharge has been extensively applied for removing pollutants including aromatics [18], aldehydes [19], inorganic compounds [20] and mercaptans [21], through of very reactive species created (e.g., O • , HO • and O 3 ) under ambient conditions (atmospheric pressure and room temperature) [11,12,22,23]. Therefore, there is a growing interest in DBD-plasma's activity enhancing when combined with photocatalytic process, could acquire synergetic effect and higher efficiency either at pilot or at industrial scale [24][25][26][27]. Moreover, a number of studies on dielectric barrier discharge (DBD) plasma-photocatalysis coupling [25,28,29] reveal very interesting prospects on single VOCs oxidation, other than few are being further developed on VOCs mixture treatment.…”

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

“…The Zr 3d 5/2 binding energy of stoichiometric ZrO 2 is in the range 182.2-183.3 eV. [37][38][39][40] All the Pt/ZrO 2 catalysts display Pt 4f 5/2 peaks centered at 73.3, 75.1, and 78.3 eV (see Figure S3 c), which correspond to metallic Pt 0 and the ionic species Pt 2 + and Pt 4 + ,r espectively. [36,40,41] Thus, the XPS data confirm the existence of mixed-valence states of platinum.…”

The Use of Zeolites for VOCs Abatement by Combining Non-Thermal Plasma, Adsorption, and/or Catalysis: A Review

“…When the pore diameter is larger than the size of the VOC molecule, the VOCs could be adsorbed and enter the internal pore structure. When the pore diameter of the zeolite is smaller than the dynamic diameter of the molecule, they do not exhibit any adsorption of VOCs [85]. The size of the micropores of MS-3A, MS-4A, MS-5A, and MS-13X are approximately 0.3, 0.4, 0.5, and 1 nm respectively; whereas the dynamic size of benzene molecule is 0.59 nm and it is well adsorbed in the intrinsic pores of MS-13X [86].…”

“…Apart from the dielectric constant and metal loading on zeolites, the plasma discharge characteristics are also influenced by the textural properties of zeolites. When the size of the micropores are much smaller than the dynamic molecular size of VOCs, the adsorption of VOCs is restricted and also the formation of micro-discharges inside the pores is limited resulting in only surface discharges, and thus the decomposition efficiency is reduced [85]. But, the VOCs adsorbed on the external pores of zeolites are easily oxidized when compared to VOCs adsorbed in the inner pores [86].…”