Effect of different metal sulfate precursors on structural and catalytic performance of zirconia in dehydration of methanol to dimethyl ether

Said, Abd El‐Aziz A.; El-Aal, Mohamed Abd

doi:10.1016/s1872-5813(18)30004-5

Cited by 18 publications

(16 citation statements)

References 40 publications

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“…2-/α-Al 2 O 3 , Zhang et al [27] also observed that the sulfation process did not interfere with the crystallinity of the alumina, with the calcination temperature having a greater influence on the crystallinity of the material. A similar result was observed by Said and El-Aal [26] when studying the sulfation process of zirconia by different metallic precursors, where characteristic peaks of the tetragonal structure of zirconia were observed for all sulfation agents.…”

Section: Resultssupporting

confidence: 87%

“…1, where the presence of the stable crystalline phase α-Al 2 O 3 (JCPDS file 89-7717) is observed in both diffractograms. The different intensities of the diffraction peaks were attributed to the possibility of a higher ordering or disordering caused by the stress of the formation of a new phase of Al 2 O 3 in a small amount [26]. Thus, the addition of the SO 4 2ion did not alter the crystalline structure of α-alumina.…”

Section: Resultsmentioning

confidence: 96%

“…The SO 4 2-/α-Al 2 O 3 catalyst showed a morphology with less agglomeration and smaller particles, which would indicate a greater potential for dispersion in a medium and a higher contact of the catalysts' surface with the reagents, which also tends to promote a greater catalytic conversion of organic compounds due to SO 4 2acidic character [26,27].…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and morphology of mechanically sulfated acid catalysts of α-Al2O3

et al. 2021

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This work reports the evaluation of the microstructure, morphology, and catalytic behavior of α-Al 2 O 3 synthesized via combustion method for esterification reaction of oleic acid in soybean oil with ethanol to produce biodiesel. The reaction was evaluated with 2 wt% of catalyst at 160 °C for 3 h when the molar ratio of fatty acid:ethanol was 1:12. To enhance the catalytic performance of α-Al 2 O 3 , its sulfation was done by a different method using mechanical milling. The microcatalysts were characterized by X-ray diffraction, Fourie transform infrared spectroscopy, granulometric analysis, and scanning electron microscopy. Results showed α-Al 2 O 3 as the major phase, presence of SO 4 2groups, the contribution of the sulfation process to morphology with reduction of agglomerates, and particle size from 18.98 to 15.30 mm. The yield of ester was enhanced from 80% (α-Al 2 O 3 as a catalyst) to 93% (SO 4 2-/α-Al 2 O 3 as a catalyst), which showed the milling as a fast method for synthesis of a highly efficient acid catalyst to produce biodiesel.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Microstructure and morphology of mechanically sulfated acid catalysts of α-Al2O3

et al. 2021

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“…Recent studies have shown that zirconia has a synergistic effect on DME production [133][134][135]. Independent of the fact that Cu surfaces or Cu-ZnO interfaces can serve as the standard active phase for CO2based catalytic technologies, nevertheless new synthetic methods for Achieving better synergies in this field are a welcome step in the composition of the combined catalyst [136].…”

Section: Core Catalystmentioning

confidence: 99%

Direct catalytic production of dimethyl ether from CO and CO2: A review

Akhoondi

Osman

Eslami³

2021

Synth. Sinter.

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Dimethyl ether (DME) is a synthetically produced alternative fuel to diesel-based fuel and could be used in ignition diesel engines due to increasing energy demand. DME is considered extremely clean transportation and green fuel because it has a high cetane number (around 60), low boiling point (−25 °C), and high oxygen amount (35 wt%) which allow fast evaporation and higher combustion quality (smoke-free operation and 90% fewer NOx emissions) than other alternative CO2-based fuels. DME can be synthesized from various routes such as coal, petroleum, and bio-based material (i.e., biomass and bio-oil). Dimethyl ether can be produced from CO2 to prevent greenhouse gas emissions. This review aims to summarize recent progress in the field of innovative catalysts for the direct synthesis of dimethyl ether from syngas (CO+H2) and operating conditions. The problems of this process have been raised based on the yield and selectivity of dimethyl ether. However, regardless of how syngas is produced, the estimated total capital and operating costs in the industrial process depend on the type of reactor and the separation method.

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“…Furthermore, the addition of sulfate increase the number of Brønsted and Lewis acid sites in the ZrO 2 structure [12,13]. The stability, acidity, and catalytic performance of SZ depend on some factors, such as preparation method, surface area, source of zirconia, source of sulfate, processing pH value, temperature, aging time, calcination temperature, and environment of storage [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nickel-loaded Sulfated Zirconia Catalyst and Its Application for Converting Used Palm Cooking Oil to Gasoline via Hydrocracking Process

Aziz

Saputri²,

Trisunaryanti

et al. 2021

Period. Polytech. Chem. Eng.

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The synthesis of the nickel-loaded sulfated zirconia catalyst (Ni-SZ) and its application for the hydrocracking process have been carried out. This work has been conducted to determine the activity and selectivity from various Ni concentrations loaded on sulfated zirconia (SZ) in the hydrocracking of used palm cooking oil. The synthesis technique was preceded by sulfation of ZrO2 through incipient wetness impregnation method using H2SO4 solution and then continued with the impregnation of Ni via hydrothermal method employing NiSO4 · 6H2O precursor salt. The hydrocracking process was performed in a fix-bed microreactor at the optimum temperature (350 °C). The SZ loaded with 3 wt% of Ni (Ni-SZ 3) successfully produced the highest liquid product (44.25 wt%) and selectivity on gasoline (100 %). Besides, the gasoline fraction in the liquid product was dominated by unwanted aromatics compounds. The excellent performance of Ni-SZ 3 due to it has high acidity value, specific surface area, and Ni content.

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Effect of different metal sulfate precursors on structural and catalytic performance of zirconia in dehydration of methanol to dimethyl ether

Cited by 18 publications

References 40 publications

Microstructure and morphology of mechanically sulfated acid catalysts of α-Al2O3

Microstructure and morphology of mechanically sulfated acid catalysts of α-Al2O3

Direct catalytic production of dimethyl ether from CO and CO2: A review

Synthesis of Nickel-loaded Sulfated Zirconia Catalyst and Its Application for Converting Used Palm Cooking Oil to Gasoline via Hydrocracking Process

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