The states of vanadium species in V-SBA-15 synthesized under different pH values

An Easy Route to Synthesize Novel Mesostructured Silicas Al/SBA-16 and Its Catalytic Application

“…This trend is in consistent with the loss of specific area after incorporation of alumina in SBA-15 support due to the shrinkage of the pores by the Al clusters [28,29]. Figure 3 shows SEM and TEM images of Al/SBA-16 (20) morphologies and ordered mesostructure, respectively. It is clear that Al/SBA-16(20) possess regular spherical morphology (see Fig.…”

“…However, SBA-16 has not been studied extensively because of the difficult synthesis, such as strongly acidic conditions, the reagents concentration and temperature. Though, many works have been carried out for the incorporation of Al, Ti and V into SBA-15 [18][19][20], it is still a challenge to insert more aluminum species into SBA-16 due to the dissociation of Al-O-Si bonds under its acidic pH conditions. Recently, several groups engaged in the synthesis of more ordered silica like SBA-16 with cage three-dimensional mesostructure and its application in catalysis.…”

Combined Oxidative and Non-oxidative Dehydrogenation of n-Butane Over VOX Species Supported on HMS

“…The band with position of the maximum approximately at 4 eV can be attributed to T d oligomeric species [50][51]. The band at ca 5.9 eV belongs to T d -monomeric species [50][51][52] and the band with maximum at 5 eV is linear combination of the bands ascribed to both the Table 1. It should be noted that parent supports exhibited no reduction peaks and therefore they are not reported here for the sake of brevity.…”

Preparation and characterization of vanadium(IV) oxide supported on SBA-15 and its catalytic performance in benzene hydroxylation to phenol using molecular oxygen

“…Increase in treating time had no remarkable change on this region, suggesting that V(IV) was not further reduced. The band of 340 nm was usually contributed to V−O−V bonding [31]. The appearance of this band manifested that VO x species was connected to form VO x cluster.…”