Mo/γ-Al2O3 catalysts for the Biginelli reaction. Effect of Mo loading

Sliding friction and wear behaviour of Titanium-Zirconium-Molybdenum (TZM) alloy against Al2O3 and Si3N4 balls under several environments and temperatures

“…The lowest CoF about 0.5 was observed when TZM was tested at 600 °C ( Figure 10). This may be attributed to the formation of lubricious oxides (MoO 3 and/or Mo 4 O 11 ) thin film on the surface at high temperature although Al 2 (MoO 4 ) 3 compound might also be formed at this temperature range which has been reported elsewhere [16,20]. In the tribo-test, due to the high test temperature the formation of the oxide film is most probably faster than the wear, thus maintaining the self-lubrication of the oxide film on the surface in the whole process.…”

“…This is because molybdenum is well known for its adhesive character as it has a strong bond to glasses, polymers, ceramics and other materials [11,12]. For example, molybdenum has been added into Al 2 O 3 ceramic as a binding phase or forming a laminate structure to improve the fracture toughness of the ceramics used in cutting tools [13,14], solar selective absorbing coatings [15] and catalysts [16] etc. This could be explained by the fact that even though TZM is not very hard (280 HV 0.05 ), its elastic modulus (320 GPa) [3] is higher than most of the other metals.…”

Catalytic performance of bismuth pyromanganate nanocatalyst for Biginelli reactions

“…DHPMs have already shown biological activities [18]. Several metal oxides have been reported as nanocatalysts for the 15 Biginelli reactions including alumina supported Mo catalysts [19], nano ZnO as a structure base catalyst [20], MoO 3 -ZrO 2 nanocomposite [21], MnO 2 -MWCNT nanocomposites [22], TiO 2 nanoparticles [23], Mg-Al-CO 3 and Ca-Al-CO 3 hydrotalcite [24], Bi 2 O 3 /ZrO 2 nanocomposite [25], ZrO 2 -Al 2 O 3 -Fe 3 O 4 [26], 20 imidazole functionalized Fe 3 O 4 @SiO 2 [27], Alumina supported MoO 3 [28], ZrO 2 -pillared clay [29], ZnO nanoparticle [30], Fe 3 O 4 -CNT [31], TiO 2 -MWCNT [32], Fe 3 O 4 @mesoporous SBA-15 [33], Bi 2 V 2 O 7 [34]. It should be noticed that in Biginelli reaction, not only do the type and amount of a catalyst influence 25 the efficiency of the reaction, but also the amount of the analyte, temperature and reaction time are important factors which must be optimized.…”

Fe(III)/Bentonite as a Heterogeneous Catalyst for the Synthesis of 3,4‐dihydropyrimidin‐2‐(1H)‐ones

“…Various Lewis acids are supported over different kind of solid support for this reaction. These are FeCl 3 @nanopore silica, Lewis acids (ZnCl 2 ,AlCl 3 ,GaCl 3 ,InCl 3 and FeCl 3 ) @MCM‐41 & montmorrionolite K 10 clay, ZnCl 2 over silica, Cu@PMO‐IL, MoO 3 @Al 2 O 3 , HBF 4 ‐SiO 2 , SbCl 3 @Al 2 O 3 , LaCl 3 ‐graphite, Mo/γ‐Al 2 O 3 , CuCl 2 ‐SiO 2 , SnCl 4 & TiCl 4 @SiO 2 , FeCl 3 @Al‐MCM‐41, FeCl 3 @PANI, Nafion‐Ga, Yttria‐Zirconia, ZrO 2 ‐pillared clay, Ce@MCM‐41, Ps‐AlCl 3 , metalsalts@NaY, SnCl 2 @nanoSiO 2 , Mg/Fe hydrotalcite, ZnCl 2 , CuCl 2 , NiCl 2 , and CoCl 2 doped hydroxyapatite, ZnCl 2 , CuCl 2 and NiCl 2 doped fluorapatite, SOCl 2 @ silica gel and recently work on HClO 4 ‐Al 2 O 3 were devised for Biginelli reaction [31–55] . These reported catalyst exhibited very good yield towards DHPMS/DHPMTHs with good reusability.…”