Novel bifunctional NiMo/Al-SBA-15 catalysts for deep hydrodesulfurization: Effect of support Si/Al ratio

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

“…In general, it can be explained that the introduction of the Al species followed by calcinations resulted in the formation of ink-bottle type pores within the substrate [26,27]. 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.…”

Short-channeled mesoporous Zr–Al-SBA-15 as a highly efficient catalyst for hydroxyalkylation of phenol with formaldehyde to bisphenol F

“…3, it can be found that both Lewis and Brønsted acidic sites increase with Al contents. It was well documented that there was no B acid sites observed in the spectrum of pure SBA-15 [41][42][43]. Hence, it can be concluded that the Brønsted acid sites are generated due to the presence of Zr and Al in the framework of SBA-15.…”

“…3. According to the literatures [34,[39][40][41][42][43], bands at 1445 and 1595-1602 cm À1 can be assigned to the hydrogen-bonded pyridine. The bands at 1450 and 1620 cm À1 are attributed to the pyridine adsorbed onto Lewis acidic (L) sites, and the bands at 1545 and 1638 cm À1 are assigned to the pyridine adsorbed onto Brønsted (B) acidic sites, while the band at 1490 cm À1 is ascribed to the pyridine adsorbed onto both B and L acid sites.…”

Synthesis of NiMo catalysts supported on mesoporous Al-SBA-15 with different morphologies and their catalytic performance of DBT HDS

“…Thus, it is necessary to improve the hydrothermal stability and acidity of SBA-15 by partial replacement of silicon ions with aluminum ions. Klimova et al [42] reported that NiMo catalysts supported on Al-containing SBA-15 materials with a Si/Al molar ratio between 30 and 10 show high activity in HDS of 4,6-dimethyldibenzothiophene. Suresh et al [43] also prepared Mo-Ni/Al-SBA-15 catalysts with a Si/Al molar ratio of 10 and showed an impressive catalytic performance for methylcyclohexylamine conversion to hydrocarbons.…”