FUEL PROCESSING TECHNOLOGY
·
2017
·
IF 3.752
Huan Liu,Quanzhen Liu,Jianzhong Zhang,Changlong Yin,Yuxin Zhao,Shumeng Yin,Chenguang Liu,Wanfu Sun
The effect of polyvinyl pyrrolidone (PVP) on the physicochemical properties and catalytic activities of unsupported NiMo catalysts was studied. The NiMo catalyst precursors were synthesized by a PVP-assisted chemical precipitation method, by adding various contents of PVP to a Ni- and Mo-containing solution. A series of techniques, including CHSN analysis, XRF , XRD, N 2 adsorption-desorption, FT-IR, SEM, TG-DSC, TPR, and XPS, were used to characterize the NiMo oxide precursors and sulfided catalysts, and the catalytic activities were tested in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The characterization results revealed that PVP was efficiently removed due to low contents in the synthesis and high solubility in water. The pore properties and hysteresis loop , the agglomeration of the nanoparticles , and the reducibility of the NiMo precursor were affected by the introduction of PVP, while the phases of the precursors and the thermal stabilities were little changed. Ni 3 S 2 and MoS 2 phases were observed in the sulfided catalysts. The catalysis results revealed that the hydrogenation pathway was predominant in the HDS of DBT. A NiMo catalyst synthesized with 0.5 g PVP showed a higher conversion of DBT than the other NiMo catalysts, possibly due to efficient formation of the ‘NiMoS’ active phase. This facile, scalable, and cost-effective route to prepare unsupported NiMo catalyst with enhanced HDS activities would be attractive in industrial applications.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fengyu Tian,Wenhong Wang,Bin Liu,Yuan Pan,Bin Dong,Yichuan Li,Yanpeng Li,Hailing Guo,Yongming Chai,Chenguang Liu
The future implementation of ultralow sulfur fuel regulations requires researchers to have an excellent understanding of the mechanism of the synergistic effect between the Co(Ni) and (Mo)W sulfides in supported Co(Ni)Mo(W)S hydrodesulfurization (HDS) catalysts. This synergistic effect occurs when the distance between two metals is on the mm or nm scale. To investigate the promotion of HDS on the µm scale, a series of Co and Mo multilayer flake catalysts with a thickness of 1 mm were prepared by laminate molding. The distance between CoS x and MoS 2 in these specially structured catalysts was adjustable on the µm scale by controlling the order and quality of the catalyst powder. The results for the HDS of dibenzothiophene (DBT) demonstrate that there is an obvious synergistic effect between CoS x and MoS 2 on the µm scale. The results of pyridine IR spectroscopy indicate that this synergy is due to CoS x and MoS 2 synergistically generating more coordinatively unsaturated sites (CUSs) and -SH active sites at the μm scale, thus increasing the HDS activity. Moreover, the catalyst activity increases as the distance between CoS x and MoS 2 decreases, and the fact that the feed comes into contact with CoS x first greatly improves the activity.
研究领域:
催化化学
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能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yiming Zhou,Suitao Qi,Bolun Yang,Chunhai Yi
Perhydro-dibenzyltoluene (18H-DBT) possesses a high hydrogen storage capacity and is regarded as a promising liquid organic hydrogen carrier (LOHC). The key to its application lies in long-period dehydrogenation with high conversion and less carbon deposition at a lower temperature. In this work, the WPt/Al2O3 catalyst was synthesized by a sol–gel method combined with a precursor pretreatment method for perhydro-dibenzyltoluene continuous dehydrogenation reaction in a fixed bed reactor. Compared to the unmodified Pt/Al2O3 catalyst, the WPt/Al2O3 catalyst could enable 18H-DBT continuous dehydrogenation at 250 °C, with the degree of dehydrogenation increasing from 80% to 90% and remaining stable even after 150 h. It is attributed to the unique structure of the Pt species on the WPt/Al2O3 catalyst, which exists in the form of cubic Pt nanoparticles and enhances the hydrogen spillover effect from Pt to tungsten oxides on the catalyst surface, improving the activity and stability.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Fengyu Tian,Xianfu Zeng,Guangzheng Sun,Zhaohao Han,Guangxun Sun,Yuan Pan,Bin Dong,Yichuan Li,Yanpeng Li,Hailing Guo,Bin Liu,Chenguang Liu,Yongming Chai
The petroleum refining industry faces increasing challenges in processing sulfur-rich crude oils while meeting stringent environmental regulations. Increasing the metal loading is the most straightforward approach to enhancing catalyst activity. However, under high metal loading conditions, the catalyst tends to form a significant amount of isolated low-activity NiS x and NiO x species. This study presents an effective " sulfidation-oxidation-secondary sulfidation" reconstruction process to enhance the hydrogenation performance of high-loading sulfide NiMoW/SiO 2 catalysts. The migration of active species on the metal surface was induced through high-temperature calcination and sulfur-oxygen transformation processes, leading to the conversion of isolated NiS x and NiO x species into a distinctive NiMoWS/NiS x -SiO 2 composite active phase, with NiS x functioning as a secondary support. Extensive characterization using XRD, HRTEM-EDS, XPS, and DFT calculations revealed that this structural modification substantially increased metal dispersion, sulfidation degree, and hydrogen spillover effects. The optimized NiMoW-300(S) catalyst displayed excellent hydrodesulfurization (HDS) activity and hydrogenation selectivity, with a relative volumetric activity (RVA) 2.49 times higher than that of the conventional NiMo/γ-Al 2 O 3 catalyst, while also demonstrating outstanding stability.
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Zhiheng Wang,Yanyan Liu,Xin Li,Ruiyao Gao,Jiong Sun,Jiankun Liu,Songdong Yao
This study utilized the swelling properties of superabsorbent polymers (SAP) to adsorb zeolite sols and slurries to construct C-HY composites. The synthesized C-HY composites proved to be effective supports for NiMo catalysts in the hydrodesulfurization (HDS) of dibenzothiophene ( DBT ) and 4,6-dimethyl-dibenzothiophene (4,6-DMDBT). XRD , BET, SEM, TG, NH 3 -TPD, FTIR, H 2 -TPR, TEM and XPS were used to characterization the texutural structure, acidity and metal distribution of prepared NiMo/C-HY catalysts. By combining zeolite slurries with SAPs, HY can be efficiently incorporated into carbon substrate structure in three dimensions (3D), thereby changing the structural characteristics, morphology, acidity, and metal distribution of HDS catalysts. The conversion of DBT decreases sequentially: NiMo/C-HY-s > NiMo/C-HY-h > NiMo/C-HY-p > NiMo/C-HY-c, and the conversion of 4,6-DMDBT decreased sequentially: NiMo/C-HY-s > NiMo/C-HY-p > NiMo/C-HY-h ≫ NiMo/C-HY-c. The introduction of HY into the carbon support can increase the HDS reaction rate of NiMo/C by more than 1.2–1.5 times. The intrinsic reaction activity of NiMo/C-HY-s can even exceed that of traditional NiMo/Al 2 O 3 catalysts. Based on the same Mo loading amount, the HDS activity of NiMo/C-HY-s is twice that of NiMo/Al 2 O 3 in DBT HDS and 1.1–1.5 times that of NiMo/Al 2 O 3 in 4,6-DMDBT HDS. It is thought that HY in carbon composites promotes C–S bond cleavage of sulfur-containing molecules in DBT HDS. The unique dispersion of Mo species induced by HY favors the formation of highly stacked NiMoS active phases, which may be the crucial in 4,6-DMDBT HDS.
研究领域:
催化化学
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材料科学
·
能源化工
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Yao Lu,Fang-Qi Gao,Yu-Yan Wang,Ying-Wen Fu,Zhuo-Miao Li,Juan Xie,Gao-Qiang Liu,Yong-Nan Liu
The environmental hazards caused by accumulation of waste tire rubber (TR) constitute a major global concern. Microbial desulfurization is an environmentally friendly method for treating waste TR for recycling; it is characterized by mild reaction conditions and low generation of harmful pollutants. Here, we report a new microorganism, Escherichia sp., which was isolated from waste tire surfaces and has the ability to desulfurize TR. Exogenous dibenzothiophene (DBT) increased the cell growth and TR desulfurization ability of Escherichia sp. in a desulfurization medium containing TR. Transcriptomic analysis revealed that TR-only treatment significantly upregulated the expression of the 4S desulfurization pathway gene and six transcription factors, and TR-DBT cotreatment further increased the upregulation of these genes compared with TR-only treatment in Escherichia sp. Overexpression of these six transcription factors in Escherichia sp. revealed that, deoR , was the most effective at increasing transcription of 4S genes and enhancing the TR desulfurization ability. In addition, exogenous DBT and deoR overexpression enhanced the ability of Escherichia sp. to decrease the intensities of C=C and C-S bonds and increased the intensities of S=O and O=S=O bonds. Our report establishes a TR desulfurization strategy involving exogenous DBT treatment or deoR overexpression in a new Escherichia sp. strain.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Qing Liu,Ting Su,Haowei Zhang,Weiping Liao,Wanzhong Ren,Zhiguo Zhu,Kaixuan Yang,Christophe Len,Jia Yu,Deyang Zhao,Hongying Lü
Photocatalytic oxidative desulfurization (PODS) is a novel emerged promising method for effectively removing sulfur compounds under milder operating conditions. Herein, Anderson type polyoxometalate (NH 4 ) 4 ZnH 6 Mo 6 O 24 modified TiO 2 nanomaterial (named Zn-Mo/TiO 2 ) was designed to oxidize DBT to DBTO 2 under visible light irradiation with H 2 O 2 , this catalyst was synthesized based on Anderson type polyoxometalate (NH 4 ) 4 ZnH 6 Mo 6 O 24 by a sol-hydrothermal method. Different experimental effects of Anderson type polyoxometalate modified TiO 2 on the desulfurization conversion rate were investigated, including different (NH 4 ) 4 ZnH 6 Mo 6 O 24 contents, various catalyst dosage, additional sulfur-containing substrates and different oxygen sulfur ratios. 100 % sulfur removal can be achieved with (NH 4 ) 4 ZnH 6 Mo 6 O 24 /TiO 2 catalyst in only 30 min under room temperature. The considerable enhancement of photocatalytic activity is associated with a synergistic effect between the multi-metal structure of polyoxometalate and TiO 2 , which are conducive to promoting the transfer and separation of photogenerated electrons and holes.
研究领域:
催化
·
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2020
·
IF 4.982
Cheng Wang,Ai-Rong Li,Yu-Ling Ma
The synthesis of highly efficient and stable catalysts for oxidative desulfurization is still a challenging task. Herein, a composite material (HPMo@UiO-66) of phosphomolybdic acid (HPMo) encapsulated in the metal-organic framework UiO-66 with missing-linker defects was prepared via a one-pot hydrothermal method . A series of as-synthesized catalysts were systematically characterized by XRD , FT-IR, SEM , BET, TGA , XPS , UV–vis and PL . Through oxidative desulfurization experimental evaluations, the catalyst 0.5-HPMo@UiO-66-D with defects shows the superior catalytic oxidative desulfurization performance and high reusability . 0.5-HPMo@UiO-66-D is able to completely remove DBT in the model fuel in 60 min, and the reaction system can be recycled 10 times with a high activity. In addition, the kinetics and the activation energy of the oxidative desulfurization were studied.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2016
·
IF 3.611
Si-Wen Li,Rui-Min Gao,Rong-Lan Zhang,Jian-she Zhao
A catalyst system designed by a kind of hybrid material POM@MOF-199@MCM-41 (PMM) was found by a one pot and POM template self-construction of MOF-199 in the pore of MCM-41. This catalyst was exploited to act as a stable heteropolyacid-based one in the direct oxidative desulfurization process with a feedstock of model oil under O 2 as oxidant. Based on optimal conditions, the DBT conversion reached up to 98.5% and the PMM could be recycled ten times with a slight decrease, which was compared with heteropolyacid only based on MOF-199 and MCM-41, respectively. Additionally, the structure of ordered nano-sized pores of MOF-199 with POM encapsulated in was clear under crystal analysis, which offered strong evidences for the further movement into the MCM-41.
研究领域:
化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Chunping Yang,Kun Zhao,Yan Cheng,Guangming Zeng,Mingming Zhang,Jingjing Shao,Li Lu
In this paper, the performance of catalytic oxidative desulfurization (ODS) was studied using catalyst MoO 3 /4A which was prepared by depositing molybdenum on 4A molecular sieve , a microporous material . Dibenzothiophene (DBT) and benzothiophene (BT) were selected as the target compounds, and oil-soluble cyclohexanone peroxide (CYHPO) as an oxidant. The effects of relevant parameters on ODS including molybdenum loading, reaction temperature, reaction time, the molar ratio of CYHPO/DBT and the weight of catalyst MoO 3 /4A were investigated, and the oxidation mechanisms as well as the kinetics were also examined individually. The catalytic oxidative removal of DBT and the residual sulfur content reached 99.0% and 5 ppmw, respectively, at an optimal catalytic condition of Mo loading of 6 wt.%, molar ratio of CYHPO/DBT of 2.5 and volume mass ratio of model gasoline to catalyst MoO 3 /4A of 100 at 373 K over 30 min. The optimal design of experiments using Box–Behnken method was employed to evaluate the effects of individual process variables such as, reaction temperature, reaction time and molar ratio of CYHPO/DBT and their optimum values were found to be 340 K, 38 min and 3.8, respectively, to achieve a conversion of 100%. The catalyst could be reused for 4 times before the total DBT content of treated model gasoline was higher than 10 ppmw, and the activity of the desulfurization system was above 95% after regenerating for 9 times. The catalytic oxidation of DBT and BT fitted the pseudo-first order kinetic model pretty well. The catalyst MoO 3 /4A was characterized by the scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectrum (XPS), and the data showed that a thin layer of active components was covered on the catalyst surface which helped to explain the satisfactory catalytic performance.
研究领域:
化学工程
·
环境科学
·
催化材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 49
·36622-36632
·
IF 3.9
Lijun Xu,Qian Tong,Bing Hu
Through a simple room-temperature process, different amounts of Keggin-type quaternary ammonium silicotungstate were successfully encapsulated into the metal–organic framework (MOF) material ZIF-67. The catalysts were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and BET analysis. An extraction and catalytic oxidation desulfurization system was studied using H2O2 as an oxidant and a deep eutectic solvent (DES) as an extractant. Using the 43.06%-SiW12@ZIF-67 composite under optimal reaction conditions, DBT present in a model oil could be deeply and effectively removed. The catalyst was reused 6 times, and the desulfurization rate still exceeded 90%. Finally, a possible desulfurization mechanism is proposed.
研究领域:
催化
·
环境化学
·
材料科学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Lin Li,Xianwei Shen,Chaocheng Zhao,Qiyou Liu,Xuwei Liu,Yanan Wu
A potent bacterial strain capable of degrading dibenzothiophene (DBT) was isolated and evaluated for its characteristics. The strain, designated as LKY-5, is rod-shaped, gram-negative, and occurs mainly in clusters. It was identified as belonging to the Pseudomonas genus based on the 16S rDNA sequence and phylogenic analysis. Determination of its DBT depletion efficiency by gas chromatography revealed that the isolate was able to completely degrade up to 100 mg L −1 DBT within 144 h. The pH values, DBT concentrations, and biomasses in the medium varied significantly in the initial 24 h. A biosurfactant produced by LKY-5 was extracted and identified as a di-rhamnolipid with the formula Rha-Rha-C 8 -C 8:1 by HPLC-ESI-MS/MS. There were 26 metabolites in the DBT degradation process. Pseudomonas sp. LKY-5 exhibited unusually high DBT degradation efficiency via multiple metabolic pathways. Compared with the reported 4S and Kodama pathways, two more expanded metabolic pathways for the degradation of DBT are proposed. The polycyclic aromatic sulfur heterocycles (PASHs) in diesel , such as C 1 -DBT, C 2 -DBT, C 3 -DBT, 4,6-DMDBT, and 2,4,6-TMDBT, can also be degraded with 28.2–42.3% efficiency. The results showed that LKY-5 is an excellent bacterial candidate for the bioremediation of PASH-contaminated sites and sediments.
研究领域:
环境微生物学
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生物降解
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）