Bifunctional mesoporous Cu–Al–MCM-41 materials for the simultaneous catalytic abatement of NOx and VOCs

Predictive design of engineered multifunctional solid catalysts

“…Cu(II) is very versatile, as it possess both redox and acidic properties, and has subsequently been found to be highly active in NO x reduction. 100 However, Cu(II) species (preferentially occupying square planar or octahedral geometries) were found to be unstable in the MCM-41 framework forming inactive CuO species on calcination, as characterised by EPR and UV-Vis DRS studies. 100 From a design perspective, this was overcome by introducing a small quantity aluminium ions into the framework, which was found to stabilise a large proportion of the Cu(II) ions ( Figure 13).…”

“…100 However, Cu(II) species (preferentially occupying square planar or octahedral geometries) were found to be unstable in the MCM-41 framework forming inactive CuO species on calcination, as characterised by EPR and UV-Vis DRS studies. 100 From a design perspective, this was overcome by introducing a small quantity aluminium ions into the framework, which was found to stabilise a large proportion of the Cu(II) ions ( Figure 13). Consequently the bimetallic catalyst showed a higher activity and increased stability, in comparison to the monometallic analogue.…”

Preparation of Copper Oxide with High Surface Area Associated with Mesoporous Silica

“…Mesoporous silica and zeolites can make good supports for metal oxides or catalysts themselves due to their excellent pore structures [16][17][18][19][20]. Copper oxides supported on mesoporous silica materials, i.e.…”

Silica materials recovered from photonic industrial waste powder: Its extraction, modification, characterization and application

“…6b illustrates the powder XRD patterns of the MCM-41(PWP) and MCM-41(NaSi) samples. One can see that MCM-41(NaSi) sample exhibited a welldefined (1 0 0) diffraction peak located at 2Â of 2.3-2.6 • and three reflections of (1 1 0), (2 0 0) and (2 1 0) at 4.2, 4.7 and 6.2 • , respectively, which could be indexed on a hexagonal lattice of mesoporous silica materials [6,12,22]. Similar observation was also seen for the MCM-41(PWP) sample, thus indicating that highly ordered mesostructure was obtained using the supernatant extracted from photonic waste powder as the silica source.…”

“…The detailed procedure was described in Karthik et al [12]. The molar composition of the gel mixture was 1 SiO 2 :0.2 CTAB:120 H 2 O:0.89 H 2 SO 4 .…”