Studies on dispersion and reactivity of vanadium oxides deposited on lamellar ferrierite zeolites for condensation of glycerol into bulky products

Abstract

The acetalization of acetone with glycerol was investigated using vanadium-impregnated catalysts. The siliceous supports FER, a purely microporous material, and ITQ-6, a micro/mesoporous material, were obtained from a ferrierite lamellar precursor, PreFER. Both supports were impregnated with 1, 5 or 10 wt.% of vanadium. The structural properties were characterized by X-ray diffraction and N 2 adsorption/desorption, the dispersion and speciation of surface vanadium were analyzed by diffuse reflectance UV-vis spectroscopy and X-ray absorption spectroscopy (XANES and EXAFS), and the total acidities of the catalysts were evaluated by temperature-programmed NH 3 desorption. The [5V]Si-ITQ-6 and [10V]Si-ITQ-6 catalysts provided the best catalytic results, with conversions of 100 and 90%, respectively, and selectivity towards solketal of approximately 99%. The higher surface area generated by mesoporosity in the Si-ITQ-6 support, compared to the microporous Si-FER support, provided good access for the diffusion of reactants and products, and good dispersion of vanadium, even at high vanadium loadings (10 wt.%), with preferential formation of VO 4 monomers and VO x oligomers on the surface. The greater contributions of these species to the total acidities of the catalysts resulted in higher catalytic activities, compared to the effect of V 2 O 5 agglomerates.

A Review on the Catalytic Acetalization of Bio-renewable Glycerol to Fuel Additives

“…Also, the heterogeneous catalysts are divided into four categories of zeolite-, heteropoly acid-, metal-, and polymers-based catalysts. As it can clearly be seen, the highest catalytic activity (complete conversions) were observed from the rare-earth triflate catalysts (Pierpont et al, 2015 ), Ni-Zr/activated carbon catalyst (Khayoon and Hameed, 2013 ), (L)Ru (II)@SBA-15 (Lazar et al, 2018 ), Amberlyst-47 (Guemez et al, 2013 ), and [5%V] Si-ITQ-6 (Vieira et al, 2018 ). The detail of each reaction process and optimum conditions reported in Table 3 .…”

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

“…For the acetalization of glycerol, among the reported various polyvalent metal ion incorporated on MOR catalysts, the synergistic effect of Cu and MOR made it the most effective catalyst for the production of solketal with high selectivity ( Priya et al, 2017 ). In another report, V 2 O 5 deposited in lamellar ferrierite and ITQ-6 zeolites were reported for the solketal synthesis from glycerol ( Vieira et al, 2018 ). The high activity and selectivity achieved in the case of ITQ-6 is due to the presence of meso/micro pores and better diffusion compared to the ferrierite zeolite.…”

“…Metals such as Au, Sn, CuO incorporated in zeolites (beta and USY) have been employed as catalysts for the single-step conversion of glycerol to methyl lactate ( Lu et al, 2017 ; Zhou L. et al, 2019 ). The Au/Sn-USY catalyst exhibited high selectivity of methyl lactate due to high dispersion of Au to the Sn-Au interactions, where Sn contributed to the modification of acidic zeolite property ( Vieira et al, 2018 ). Interestingly, Fe-MFI zeolites were used as catalysts for the gas phase oxidation of glycerol to dihydroxyacetone (an intermediate for lactic acid production) using molecular oxygen ( Lari et al, 2015 ).…”

Activation of Mo and V oxides supported on ZSM-5 zeolite catalysts followed by in situ XAS and XRD and their uses in oxydehydration of glycerol

“…The depletion of non-renewable energy feedstocks, together with their environmental impacts, has motivated the search for eco-friendly alternatives to substitute fuels produced by the petrochemical industry. The development of green processes to obtain compounds such as acrolein and acrylic acid from glycerol has attracted much attention globally, due to the co-production of glycerol in the transesterification reactions of vegetable oils [1][2][3][4][5][6][7][8][9].…”