Intrinsic role of pH in altering catalyst properties of NiMoP over alumino-silicate for the vapour phase hydrodeoxygenation of methyl heptanoate

Abstract

Ni2P, MoP, and NiMoP supported on MAS (10) were successfully prepared using acid and base regulators. The intrinsic role of pH and synergic factors has altered the physicochemical properties of the catalysts, which are responsible for HDO activity.

Catalytic renovation of non‐edible oil to biodiesel production through sulfated Mg‐Al 2 O 3 (10) catalysts

“…NH 3 ‐TPD profile was used to determine the acid sites of Mg‐Al 2 O 3 (10), S1/Mg‐Al 2 O 3 (10), S2/Mg‐Al 2 O 3 (10), and S3/Mg‐Al 2 O 3 (10) catalysts as shown in Figure 3 and the corresponding acid sites of the materials are tabulated in Table 1. Three different types of acid sites such as weak, medium, and strong acid sites were observed with respective temperature ranges of 100°C to 250°C, 250 to 450°C, and above 450°C 42 . Therefore, Mg‐Al 2 O 3 and Al 2 O 3 materials exhibited a lesser amount of acid sites, while introducing sulfide over the material, the strong acid sites were enhanced and it can be clearly seen in Figure 3.…”

Sustainable biofuel synthesis from non-edible oils: a mesoporous ZSM-5/Ni/Pt catalyst approach

“…The spectra of all the samples are identical in terms of band locations. 50 The absorption wavelengths at 458 cm −1 , 1796 cm −1 , 1100 cm −1 , and 1220 cm −1 correspond to the T–O bending, interior asymmetric stretching, external symmetric stretching, and exterior asymmetric stretching vibrations of the siliceous materials. The bands at 1200 to 450 cm −1 can be assigned to Si–O–Al, Si–O–Si, Si–O, Si–Al and T–O species.…”

“…49 The spectra of all the samples are identical in terms of band locations. 50 The absorption wavelengths at 458 cm −1 , 1796 cm −1 , 1100 cm −1 , and 1220 cm −1 correspond to the T-O bending, interior asymmetric On the other hand, the bands observed between 3750 to 3450 cm −1 are attributed to Si-OH, Si-OH-Al, and -OH hydroxyl groups. The absorption band with high intensity around 3714 cm −1 is assigned to internal silanol groups.…”

Efficient depolymerization of lignins to alkylphenols using phosphided NiMo catalysts

“…The SiO2-Al2O3 supported catalyst shows the highest acidity (733 µmol g -1 ), in line with literature data ([760 µmol g -1 ] 30 and [630 µmol g -1 ] 32 ), which is due to the presence of Al2O3 in the formulation. 3,[33][34][35][36] Of all the acidic supports, the TiO2-supported catalyst showed the lowest acidity (145 µmol g -1 ). Intermediate acidity was found for NiMoP supported on SiO2 and AC catalysts, both with a desorption peak in the temperature range of 120-450 °C.…”