Promotional effects of rare-earth (La, Ce and Pr) modification over HZSM-5 for methyl mercaptan catalytic decomposition

Liu, Jiangping; He, Dedong; Chen, Dingkai; Hao, Husheng; Yu, Jianguo; Lu, Jichang; Liu, Feng; Liu, Pan; Zhao, Ye; Luo, Yongming

doi:10.1016/j.jtice.2017.07.006

Cited by 31 publications

(23 citation statements)

References 46 publications

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“…Lanthanum oxides, in particular, are smaller in size and may readily diffuse through the pore mouth of HZSM-5 and then deposit within the parent HZSM-5 catalyst’s internal pore channel, thereby, resulting in a considerable drop in the values of all these textural qualities [ 28 , 57 , 58 , 59 ]. Moreover, this can also verify the assumption of the decreased XRD intensities that are shown in the XRD pattern [refer to Figure 4 ] [ 34 ].…”

Section: Resultssupporting

confidence: 73%

“…As shown in Figure 5 a, based on the IUPAC classification, N 2 adsorption–desorption isotherms of the lanthanum-modified zeolite catalysts were found to be of type I isotherms with an H 3 hysteresis loop at a high P/P 0 region, which is typical of micropore and mesoporous samples [ 34 , 60 ], which is similar to those of the HZSM-5. Moreover, by increasing the lanthanum-loading-weight percentage on the parent HZSM-5 catalyst, the N 2 adsorption decreased with the relative pressure in the whole pressure range (P/P 0 ).…”

Section: Resultsmentioning

confidence: 96%

“…The characteristic XRD peaks of HZSM-5 at (2θ = 7.96, 8.52, 14.80, 22.88, 24.24, 29.92, and 45.48°) correspond to the peaks of ZSM-5 of the reference standard for a highly pure calcined ZSM-5. Therefore, the parent HZSM-5 zeolite samples exhibit a typical MFI-type structure (mordenite framework inverted) [ 32 , 34 , 37 , 50 ]. The characteristic angles with a small shift from the reference standard peaks were observed.…”

Section: Resultsmentioning

confidence: 99%

“…To the best of our knowledge, there is no extensive study in the literature on the influence of La/HZSM-5 on algal HO catalytic deoxygenation upgrading. Furthermore, the majority of the literature on altering HZSM-5 with lanthanum has focused on model compound catalytic cracking processes (alcohol [ 31 , 32 , 33 ], methyl mercaptan [ 34 , 35 ], alkane [ 36 ], pyrolysis of bio-mass [ 37 , 38 ], and furans [ 39 ]) over La/HZSM-5 catalysts instead of algal HO (FAMEs) as a reactant.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Deoxygenation of Hydrolyzed Oil of Chlorella Vulgaris Microalgae over Lanthanum-Embedded HZSM-5 Zeolite Catalyst to Produce Bio-Fuels

et al. 2022

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Microalgae is one of the most important sources of green hydrocarbons because it contains a high percentage of lipids and is likely to reduce reliance on fossil fuels. Several zeolite-based catalysts have a short lifetime due to coke-formation deactivation. In this study, a lanthanum-modified HZSM-5 zeolite catalyst for the conversion of crude oil into non-oxygenated compounds (hydrocarbons) and oxygenated compounds has been investigated. The crude oil of Chlorella Vulgaris microalgae was extracted using Soxhlet and converted into hydrolyzed oil (HO) through a transesterification reaction. The experiments were conducted in a batch reactor (300 °C, 1000 rpm, 7 bar of N2, the catalyst to the algal HO ratio of 15% (wt.%) and 6 h). The results were organized into three groups: product yield, chemical composition, and carbon number distribution. The liquid products were investigated, including their elemental composition, higher heating value (HHV), atomic ratios of O/C and H/C, and degree of deoxygenation (DOD%). The loading of lanthanum into HZSM-5 zeolite with different loading percentages enhanced the acid sites needed for the algal HO conversion. Among all the synthesized catalysts, 10%La/HZSM-5 produced the highest conversion of the algal HO, the highest yield of hydrocarbons, the highest HHV, and the highest DOD%; those were 100%, 36.88%, 34.16 MJ/kg, and 56.11%, respectively. The enhanced catalytic conversion was due to the presence of lanthanum, which alters the active sites for the desired reactions of catalytic deoxygenation. The main effect of the modification of the parent HZSM-5 zeolite with lanthanum led to adjusting the acidic sites needed to increase the conversion (%) of the algal HO in the catalytic deoxygenation process and thus increase the hydrocarbon yield (%), which in turn led to an increase in the HHV and DOD%. The proposed La-based zeolite composite is promising for different energy applications due to its unique benefits compared to other expensive and less-stable catalysts.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Catalytic Deoxygenation of Hydrolyzed Oil of Chlorella Vulgaris Microalgae over Lanthanum-Embedded HZSM-5 Zeolite Catalyst to Produce Bio-Fuels

et al. 2022

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“…From a practical point of view, the CH 3 SH can be eliminated to a great extent by catalytic conversion. According to the previous study, catalytic conversion is the most complete and effective method to remove CH 3 SH, which is include catalytic oxidation and catalytic decomposition . However, the catalytic decomposition is constrained by reaction temperature.…”

Section: Introductionmentioning

confidence: 99%

Promotional Effects of Transition Metal Modification over Al₂O₃ for CH₃SH Catalytic Oxidation

Zhang

Tang

et al. 2019

ChemistrySelect

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In this work, a series of metal-modified alumina catalysts by ultrasonic-assisted were prepared and the activity for the CH 3 SH catalytic oxidation were evaluated. The investigation shown that metal-modified alumina catalysts could obviously promote the conversion of CH 3 SH. The activity by different metal-modified alumina catalysts decreased in turn: 15%Cu-The catalysts were characterized in comprehensive by X-ray diffraction (XRD), adsorption-desorption isotherms of N 2 , hydrogen temperature-programmed reduction (H 2 -TPR), carbon dioxide temperature-programmed desorption (CO 2 -TPD) and ammonia temperature-programmed desorption (NH 3 -TPD). We found that more surface oxygen species were formed on the metal-modified alumina catalysts, and this feature can improve the catalytic activity of the catalysts. On the basis of the characterization results, the number of weak and middle basic sites were increased by the metal (Cu, Fe, Co, Ce and Mn) modified Al 2 O 3 , which were enhanced the high acid CH 3 SH adsorption. At the same time, the optimal loading amount of Cu was 15%. Based on the above analysis, a possible reaction mechanism of catalytic oxidation of CH 3 SH by Cu-Al 2 O 3 was proposed.[a] Prof.

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Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

Anekwe

Isa

Oboirien

2023

J of Chemical Tech & Biotech

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Bioethanol, synthesized through the valorization of biomass resources, is of great importance to many industries. As bioethanol has become more abundant and its price has decreased, it has become an attractive candidate for application as a base material for the synthesis of a variety of petrochemicals and fuel through catalysis. In this article, a comprehensive review of the catalytic conversion of bioethanol into hydrocarbons, including olefins and gasoline, is presented. In addition, developments and potential research opportunities in the field of bioethanol catalysis are provided to enhance bioethanol conversion. According to the findings of the study, despite significant progress in bioethanol conversion, further research is needed to address several challenges that will enable improved biofuel and chemical production.

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Promotional effects of rare-earth (La, Ce and Pr) modification over HZSM-5 for methyl mercaptan catalytic decomposition

Cited by 31 publications

References 46 publications

Catalytic Deoxygenation of Hydrolyzed Oil of Chlorella Vulgaris Microalgae over Lanthanum-Embedded HZSM-5 Zeolite Catalyst to Produce Bio-Fuels

Catalytic Deoxygenation of Hydrolyzed Oil of Chlorella Vulgaris Microalgae over Lanthanum-Embedded HZSM-5 Zeolite Catalyst to Produce Bio-Fuels

Promotional Effects of Transition Metal Modification over Al₂O₃ for CH₃SH Catalytic Oxidation

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

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Promotional effects of rare-earth (La, Ce and Pr) modification over HZSM-5 for methyl mercaptan catalytic decomposition

Cited by 31 publications

References 46 publications

Catalytic Deoxygenation of Hydrolyzed Oil of Chlorella Vulgaris Microalgae over Lanthanum-Embedded HZSM-5 Zeolite Catalyst to Produce Bio-Fuels

Catalytic Deoxygenation of Hydrolyzed Oil of Chlorella Vulgaris Microalgae over Lanthanum-Embedded HZSM-5 Zeolite Catalyst to Produce Bio-Fuels

Promotional Effects of Transition Metal Modification over Al2O3 for CH3SH Catalytic Oxidation

Bioethanol as a potential eco‐friendlier feedstock for catalytic production of fuels and petrochemicals

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Promotional Effects of Transition Metal Modification over Al₂O₃ for CH₃SH Catalytic Oxidation