Construction of Pt@CNTs/SiC Catalytic Membrane for High-Efficiency Removal of Formaldehyde and Dust

Abstract

Catalytic membranes can achieve the simultaneous purification of particulate matter (PM) and gaseous pollutants, and their performance depends on the design of a catalyst and its combination with a membrane material. Herein, a novel Pt@CNTs/SiC catalytic membrane composed of a Pt@CNTs (carbon nanotubes) membrane layer and a porous SiC support was developed for the simultaneous removal of formaldehyde and PM at room temperature. The CNT membrane layer underwent vertically integrated growth on a porous SiC support, which provided the catalytic membrane with a pore size of 7.4 μm and a high gas permeance of 240.2 m3·m–2·h–1·kPa–1. The loading of Pt particles on CNTs slightly decreased the gas permeance of the catalytic membrane (219.9 m3·m–2·h–1·kPa–1) but endowed the membrane with catalytic formaldehyde degradation performance. The obtained Pt@CNTs/SiC catalytic membrane with a 240 μm thick CNT layer and 0.8% Pt loading exhibited 99.999% filtration efficiency for 300 nm SiO2 (face velocity = 1 m/min) and 72.1% formaldehyde degradation (gas flow = 49 mL/min), implying that the Pt@CNTs/SiC membrane has good application potential in the collaborative removal of various air pollutants.

Biomimetic Chiral Nanomaterials with Selective Catalysis Activity

“…[ 145 ] The chemical reduction synthesis and electrodeposition methods have been used for the construction of NPs decorated CNTs. [ 148 , 149 , 150 ] Furtherly, the ultrathin (0.8−2.0 nm) W 2 C and Mo 2 C nanowires were synthesized confining in CNTs deriving from the encapsulated W/Mo polyoxometalate clusters. The Pd NPs were then grown on CNTs through a thermal reduction method that generated the selective semihydrogenation of alkynes.…”

Preparation of asymmetric tubular Co‐SiC catalytic membrane for synergistic removal of PM2.5, NO, and toluene

“…22,23 Moreover, in complex emission environments, such as those involving the presence of PM 2.5 , the contact and mass transfer of NO and toluene can be hindered, adding complexity to the treatment process and the risk of catalytic active site poisoning. 24,25 While the simultaneous oxidation of NO and toluene offers advantages, the treatment of PM 2.5 is typically handled as a separate process. 26 Implementing simultaneous and efficient treatment of PM 2.5 , NO, and toluene presents several benefits, including streamlining the treatment process and reducing energy consumption.…”

“…However, a common issue arises from the interaction effect between NO and toluene, often resulting in compromised oxidation performance 22,23 . Moreover, in complex emission environments, such as those involving the presence of PM 2.5 , the contact and mass transfer of NO and toluene can be hindered, adding complexity to the treatment process and the risk of catalytic active site poisoning 24,25 . While the simultaneous oxidation of NO and toluene offers advantages, the treatment of PM 2.5 is typically handled as a separate process 26 .…”