Evaluation of acid properties of mechanochemically synthesized supported niobium oxide catalysts in the alkylation of toluene

Mechanochemical Synthesis of Catalytic Materials

“…In the same direction, Pineda and co‐workers developed an innovative ball milling method, among others, for the stabilization of metal oxide nanoparticles on porous supports [97–99] . In particular, they studied the deposition of iron and cobalt oxide nanoparticles on Al‐SBA‐15, due to their excellent catalytic properties in a wide range of reactions, including some concerned with environmental remediation [97, 98] .…”

“…Overall, the as‐synthesized materials proved to be very active, and in some cases, the catalytic performance even surpassed that of conventionally‐prepared analogues. The preparation of a niobium oxide catalyst supported on Al‐SBA‐15 was achieved in a similar manner [99] …”

Recent advances in mechanochemical synthesis of mesoporous metal oxides

“…is offset along the y-axis by 20 cm 3 STP/g. 87 Mechanochemistry has also been utilized for incorporation of catalytically active metals or metal oxides such as Al, 88 Nb, 89,90 Although, some of the mechanochemically obtained metal oxides discussed here show roughly uniform mesoporosity (often nonuniform), so far it is very difficult to achieve both high crystallinity and ordered arrangement of uniform pores in such structures. So far, this method has been mainly used to obtain the mesostructured metal oxides with disordered pores.…”

“…Article Online DOI: 10.1039/D1MA00073Jmaterials can be performed just by milling the Al-SBA-15 support together with niobium ammonium oxalate hydrate at 350 r.p.m. for 10 min 89,90. After calcination at 400 °C for 4 h, Nb/Al-SBA-15 catalysts with diverse niobium loadings (0.25 -1 wt.%) were obtained.…”

Pluronic F127-assisted partial decomposition of ammonium phosphomolybdate and its application as an efficient and recyclable catalyst for the alkylation of toluene with benzyl alcohol

“…5 It is of significance to replace homogeneous catalysts with heterogeneous ones for the avoidance of these problems and easy recovery of the catalysts. Recently, considerable efforts have been made towards the development of various solid acid catalysts for alkylation reactions, such as zeolites, [6][7][8][9] mesoporous aluminum silicates, 10 oxides or sulfated oxides, 11,12 heteropoly compounds, 13,14 and other composite materials. [15][16][17] Heteropolyacids have been widely used in many reactions due to their strong Brønsted acidity and high redox activity.…”