Influence of Brønsted and Lewis acidity of the modified Al-MCM-41 solid acid on cellulose conversion and 5-hydroxylmethylfurfuran selectivity

Heterostructure of vanadium pentoxide and mesoporous SBA-15 derived from natural halloysite for highly efficient photocatalytic oxidative desulphurisation

“…As observed in Fig. 2, the stretching vibration of Si-OH groups (evidenced by the broad absorption bands around 3436 cm À1 and 1628 cm À1 ), 44 Si-O groups (evidenced by the bands at 1236 cm À1 , 1080 cm À1 and 459 cm À1 ), 37,45,46 Si-O-Si groups (evidenced by the band at 798 cm À1 ) and Fe-O (evidenced by the bands at 459 cm À1 and 638 cm À1 ) 47,48 were retained in the structures of the V 2 O 5 /Fe-Al-SBA-15 samples. Note that the absorption bands at 960 cm À1 and 886 cm À1 are attributed to the vibration of deformed Si-OH or Si-OM + (Al 3+ ) 49 and the vibration of doubly coordinated oxygen (bridge oxygen), respectively.…”

Progress in Selective Conversion of 5‐Hydroxymethylfurfural to DHMF and DMF

“…Co is used as metal for hydrogenation and CoO x is used as Lewis acid to stimulate the CÀ O bonds, synergistically enhancing the selectivity in the hydrogenolysis of HMF to DMF. Xiao et al, [59] they prepare Co/Mix-ZrO 2 catalyst by surfactant-assisted alkali precipitation method and wetness impregnation method. The results of characterizations and experiments illustrate that the cooperation between Co and t-ZrO 2 leaded to Co electrondeficiency and higher concentration of Zr(III) species, it can improve the activity of hydrogenation C=O on Co/t-ZrO 2 than Co/mÀ ZrO 2 .…”

“…[14][15][16][17][18][19][20][21][22][23][24][25][26] 5-hydroxymethylfurfural (HMF) is a very momentous platform compound, [27][28][29][30] HMF was obtained though the dehydration of biomass-derived carbohydrates, such as glucose, [31][32][33][34][35] fructose, [36][37][38][39][40] sucrose, [41][42][43][44][45] inulin, [46][47][48][49][50] cellobiose [51][52][53][54][55] and cellulose. [29,[56][57][58][59][60] Microwave technology is a simple and efficient conversion technology that can convert biomass to HMF. Li et al, [61] they convert cellulose and glucose directly into HMF in i...…”

Selective Catalytic Transfer Hydrogenation of Lignin to Alkyl Guaiacols Over NiMo/Al‐MCM‐41

“…[27,28] Its reactivity can be tuned by the incorporation of metals such as Al, W, Nb, Ti, or Zr into the silica matrix, conferring catalytic activity for hydrogen production, esterification, metathesis, hydrodesulfurization, biomass conversion, and dye degradation. [28][29][30][31][32][33][34] Noble metals (including Pt, Pd, Rh, Ru) are key active components of heterogeneous catalysts in emission control systems and the petrochemical industry, and also in biomass valorization due their exceptional activity in hydrogenation and oxidation reactions. [35,36] Unfortunately, their scarcity and con-sequent high cost limits their likely commercial use in the emergent latter application.…”