Formation of acidic Brönsted (MoOx)−(Hy)+ evidenced by XRD and 2,6-lutidine FTIR spectroscopy for cumene cracking

Binder effect on the catalytic activity of MoO3 bulk catalyst reduced by H2 for n-heptane hydroisomerization

“…In general, the results are in384 accordance with others studies[63][64][65][66]. We observed the follow-385 ing facts: (i) The spent MoO 3 , spent Mo-Al, spent Mo-Si and 386 MoO 2 do not show pyridine adsorption under our experimental 387 conditions.…”

“…The weak and strong Brönsted acid sites are transformed to water 403 during the process of activation and hydroisomerization, respec-404 tively. Thus, the elimination of Bönsted acid sites causes the forma-405tion of Lewis acid sites, which has been reported elsewhere[65].The fact that the catalysts do not exhibit any strong Brönsted acid 407 sites after may due to its instability at atmospheric conditions, 408 which lead to the formation of more stables phases, i.e., MoO 2 .…”

“…In the case of hydro- 58 isomerization, the catalytically active phase appears to be neither 59 MoO 3 nor MoO 2 but rather a partially reduced molybdenum 60 sub-oxide [1][2][3]. This molybdenum sub-oxide, mixed with other 61 reduction products, can be prepared directly from MoO 3 by 62 reduction at low temperature (623 K) under flow of a mixture of 63 H 2 /n-heptane [1][2][3], being the reduction of MoO 3 a crucial step in 64 the generation of an active catalyst for hydroisomerization reac- 65 tions [4][5][6]. 66 The reported elsewhere [1][2][3][4][5][6].…”

Characterization and Electrocatalytic Activity of Poly(4-thienylacetyl-oxy-2,2,6,6-tetramethylpiperidin-1-yloxy) Prepared by Electrochemical Polymerization

“…The bands at 1646 and 1588 cm −1 are ascribed respectively to ring stretching vibration of 2,6-lutidinium ion. 19 The other two peaks at 1280 and 1174 cm −1 are assigned to the ring stretching mode and C-H in-plane bending of 2,6-lutidinium ion. 20,21 It shows that 2,6-lutidine can get hydrogen atoms to form 2,6-lutidinium ion.…”

Selective oxidation of benzyl alcohol on poly(4-(3-(pyrrol-1-yl)propionamido)-2,2,6,6-tetramethylpiperidin-1-yloxy) electrode

“…3. The bands at 1646, 1627, and 1589 cm −1 were assigned to the ring stretching vibration of 2,6-lutidinium cation [24][25][26]. The other two bands at 1280 and 1176 cm −1 were attributed to the ring vibration and C-H bending vibration of 2,6-lutidinium cation, respectively [27,28].…”