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Synthesis and characterization of mesoporous aluminas with different pore sizes: Application in NiMo supported catalyst for hydrotreating of heavy gas oil

Paper ID Volume ID Publish Year Pages File Format Full-Text
39397 45822 2015 12 PDF Available
Title
Synthesis and characterization of mesoporous aluminas with different pore sizes: Application in NiMo supported catalyst for hydrotreating of heavy gas oil
Abstract

•Mesoporous aluminas having different textural properties were synthesized.•Varying HNO3/H2O ratio from 0 to 2, the structure of mesoporous alumina changes.•Structure changes from hexagonal → wormlike → fibular → rod like.•The Meso-Al-0 material has SA, pore diameter and pore volume of 741 m2/g, 13 nm and 3 cc/g.•The highest activity is shown by catalyst NiMo/Meso-Al-0.6.

The mesoporous alumina materials having different textural properties were synthesized by modifying the procedures mentioned in literature. Pluronic P-123 was used as structure directing agent (SDA) and aluminum isopropoxide was used as precursor for aluminum. The materials were characterized using N2 adsorption–desorption isotherms (BET), X-ray diffraction, FTIR and high resolution-TEM (HRTEM). BET, XRD and HRTEM analyses had confirmed the synthesis of mesoporous aluminas with different textural characteristics. The synthesized mesoporous aluminas were utilized as a support material for NiMo catalyst for hydrotreating of oil sands bitumen derived heavy gas oil, in a fixed bed reactor at industrial conditions. The catalytic activity was measured in terms of hydrodesulfurization (HDS) and hydrodenitrogenation (HDN). The catalysts were characterized by BET, XRD, FTIR, Raman, CO-chemisorption, HRTEM, TPD and TPR. The activity study for conventional NiMo/γ-Al2O3 was also performed for comparison. Six types of mesoporous aluminas and corresponding catalysts were synthesized based on HNO3/H2O ratio varying from 0 to 2. It was observed that with increase in water content the surface area, pore volume and pore diameter of mesoporous aluminas increase. Moreover, the structure changes form ordered hexagonal to wormlike/sponge-like and fibular and then to corrugated platelets/rod like structures with increase in water content. However, the morphology of structure was changed after loading of active metals and the catalytic active follows the order NiMo/Meso-Al-0.6 > NiMo/Meso-Al-0.4 > NiMo/Meso-Al-2 ≈ NiMo/Meso-Al-0.2 > NiMo/Meso-Al-0 > NiMo/γ-Al2O3 > NiMo/Meso-Al-1.25. The highest activity shown by catalyst NiMo/Meso-Al-0.6 could be assigned to (i) its higher pore volume and surface area, (ii) highest metal dispersion, (iii) more number of weak acidic sites and (iv) lower Mo reduction temperatures.

Graphical abstractHRTEM micrographs for (a) Meso-Al-2, (b) Meso-Al-1.25, (c) Meso-Al-0.6, (d) Meso-Al-0.4, (e) Meso-Al-0.2 and (f) Meso-Al-0.Figure optionsDownload full-size imageDownload high-quality image (416 K)Download as PowerPoint slide

Keywords
Mesoporous aluminas; Hydrotreating; Hydrodesulfurization; Heavy gas oil
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Synthesis and characterization of mesoporous aluminas with different pore sizes: Application in NiMo supported catalyst for hydrotreating of heavy gas oil
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 489, January 2015, Pages 86–97
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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Price after discount Only $4.95
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