Hydrodeoxygenation of fatty acid methyl esters and simultaneous products isomerization over bimetallic Ni‐Co / SAPO ‐11 catalysts

Abstract

Bimetallic Ni-Co/SAPO-11 catalysts were prepared and investigated for hydrodeoxygenation (HDO) of fatty acid methyl esters (FAMEs) and sequential isomerization of the products in a continuous fixed-bed reactor. The physicochemical properties of the catalysts were characterized by means of N 2 adsorption-desorption, temperature-programmed reduction of H 2 , temperature-programmed desorption of NH 3 , infrared spectra of adsorbed pyridine, and thermogravimetry. The conversion of FAMEs and selectivity of C 15-18 are enhanced over the bimetallic Ni-Co/SAPO-11 catalysts compared with that of the corresponding monometallic counterparts, which is attributed to the modification effect by Co species. The balance between metal Ni and Co and the acidity of the support plays an important role in the catalytic performance. The Ni-Co/SAPO-11 catalysts with composition of 3% Ni and 6% Co exhibit optimal catalytic performance, specifically the conversion of FAMEs, selectivity of C 15-18 , and isomerization ratio of C 15-18 , respectively, reaching 100.0%, 93.0%, and 36.1% at 400 C and 1

Anisole hydrodeoxygenation over Ni–Co bimetallic catalyst: a combination of experimental, kinetic and DFT study

“…In mixed oxides, a shift in parent peaks to lower temperatures in comparison of Ni 10 Co 0 -AC and Ni 0 Co 10 -AC indicates that the interaction of Ni and Co atoms in bimetallic catalysts would contribute to the improvement of reducibility of catalysts. 37,38 This type of interaction has been well reported in literature for Ni/Co catalysts which lead alloy formation on the surface of the support. 34,39 This peak is at lowest temperature in Ni 5 Co 5 -AC and suggests that this particular sample is highly reducible due to high interaction between Ni and Co. With this point and according to XRD, and TEM results the formation of mixed spinal phase and high dispersion of metals in Ni 5 Co 5 -AC are confirmed.…”

Hydrodeoxygenation Performance of Lignin-Derived Phenolics to Cycloalkanes: Insights into the Crystal Structures of the Nb2O5 Support

“…Therefore, the high calcination temperature was not conducive to the formation of Nb 2 O 5 supports with numerous acid sites. The loading of active metals might cover the Brønsted acid sites generated from the supports to some extent, while the unsaturated Ni and Co cations would also provide new Lewis acid sites for the catalysts . Therefore, the Brønsted acid strength of the catalysts might further decrease than those of the Nb 2 O 5 supports, while the Lewis acid strength was enhanced.…”

Bifunctional MoS2/Al2O3-Zeolite Catalysts in the Hydroprocessing of Methyl Palmitate

“…Hydroisomerization of obtained n-alkanes proceeds via dehydrogenation to alkenes over metallic sites that are protonated by Brønsted acidic sites with carbenium ion formation and subsequent isomerization and hydrogenation [12,13]. Several articles dealing with the hydroprocessing of esters in a mixture of normal and iso-alkane have been reported over bifunctional catalysts, differing in zeolite component and metal function [6,8,[14][15][16][17][18][19][20][21].…”

“…Despite high activity and selectivity, Pt-based catalysts are not preferred in industrial applications because of their high cost, low abundance, and sensitivity to poison. Hence, bifunctional catalysts containing transition metals (e.g., Ni, Co) have been tested in FAME hydroprocessing in recent years [15][16][17][18][19][20][21].…”