Beneficial influence of EDTA on the structure and catalytic properties of sulfided NiMo/SBA-15 catalysts for hydrotreating of light gas oil

Synthesis of NiMo catalysts supported on mesoporous Al-SBA-15 with different morphologies and their catalytic performance of DBT HDS

“…The Mo-O-Mo linkages can be attributed to the presence of polymolybdates in the catalysts. The bands at ∼955, ∼908, and ∼826 cm -1 can be associated with NiMoO 4 precursor phase [11,20]. The broad band in the region of 890-1000 cm -1 , which overlaps with the Mo=O stretching vibrations at ∼990 cm -1 , can be assigned to the Mo species interacting with the support [50].…”

“…Besides the acidity of SBA-15, the morphology, pore size, and pore structure of SBA-15 also have influence on the activity of catalytic reactions [7,[20][21][22]. The shape and size of mesoporous SBA-15 particles are crucial factors for the reactant and the product molecules diffusing in the particle channels, where the subsequent undesirable reactions might take place [23].…”

“…Mesoporous silica materials with high surface areas and well-ordered pore structures have potential applications in the catalytic conversion processes of large molecules because their large pore sizes can mitigate the diffusion barrier of the reactants and the products. Mesoporous SBA-15 [8,9] material synthesized using pluronic P123 triblock copolymer (EO 20 PO 70 EO 20 ) as SDA has relatively large pore and shows high hydrothermal stability due to its special configuration. Many researchers have employed SBA-15-type materials as the supports of hydrodesulfurization catalysts [10][11][12][13].…”

Synthesis of Al‐Containing Spherical Mesocellular Silica Foams with Different Pore Sizes and Their Applications as Catalyst Supports for Hydrodesulfurization of Dibenzothiophene

“…[55] In addition, the Raman bandsa t% 900 and 958 cm À1 confirm the existence of NiMoO 4 phases. [50,54] Nevertheless, the absence of well-defineds ignals at 667, 818,a nd 994 cm À1 ,t he characteristic peaks of crystal MoO 3 ,d emonstrates ag ood distribution of Mo oxide species on all prepared samples of NiMo/Al-SMCFs-x. [50,54] The results from Raman spectroscopy correspond well with those from wide-angle XRD characterization ( Figure S4).…”

“…[53][54][55] Such Mo oxide speciesr esultf rom the existence of weak interactions between the support and active metal components,l eading to easy reduction in HDN and HDS reactions. [50,54] The band centered at 958 cm À1 is assigned to the existence of large polymolybdate clusters such as Mo 8 O 26 6À . [55] In addition, the Raman bandsa t% 900 and 958 cm À1 confirm the existence of NiMoO 4 phases.…”