JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2017
·
IF 3.471
Yunwu Zheng,Fei Wang,Xiaoqin Yang,Yuanbo Huang,Can Liu,Zhifeng Zheng,Jiyou Gu
The main objective of this work was to study aromatics production via the catalytic pyrolysis upgrading of biomass using metal-loaded modified H-ZSM-5. M-ZSM-5 catalysts were prepared through the impregnation method with Zn, Ga, Ni, Co, Mg and Cu. The prepared M-ZSM-5 catalysts were evaluated by x-ray diffraction, thermal desorption spectroscopy and scanning electron microscopy. The properties, composition and product distribution of bio-oil were also analysed. Results showed that the M-ZSM-5 catalysts yielded a higher amount of non-condensable gas at the expense of the liquid yields. The Ga-ZSM-5 catalysts produced the highest yields of bio-oil (25.76 wt%), but the lowest amount of coke (22.08 wt%) compared with the unmodified ZSM-5 catalyst (33.38 wt%). The content of the single-ring aromatics prepared by using the Zn-ZSM-5 catalysts was the highest at 90.28 wt%, whereas that of the polycyclic aromatic hydrocarbon prepared by the Ni-ZSM-5 catalysts was the highest at 31.36 wt%. Moreover, the selectivity of the single-ring aromatic hydrocarbons, such as C7 and C8, were significantly affected by the use of the M-ZSM-5 catalysts. The Zn-ZSM-5 catalysts were the most selective for toluene and xylenes with contents of 36.52 wt% and 35.32 wt%, respectively, whereas the Co-based catalysts were the most selective for indene. The Ni-based catalysts can obviously improve the selectivities of benzene production and C10+ polycyclic aromatic hydrocarbons. Zn-ZSM-5 was the most effective catalyst that can be used in the production of aromatic hydrocarbons.
研究领域:
能源化学
·
催化材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Jingjie Cao,Mingwei Ma,Jinchan Liu,Yongquan Yang,Hui Liu,Xingliang Xu,Jiahui Huang,Huijuan Yue,Ge Tian,Shouhua Feng
Aluminum ion-exchanged Ca-montmorillonite with different concentrations of aluminum ion were prepared and applied in the conversion of carbohydrates to 5-hydroxymethylfurfural (HMF). It was found that two types of acid sites were present in the catalyst, Lewis acid sites for isomerization of glucose and Brønsted acid sites for dehydration of fructose. With Al-mont-10 as catalyst, the yield of HMF converted from glucose was 80.4% in a biphase system (THF: NaCl solution) at 180 °C for 2.5 h. Further, the catalyst also shows excellent catalytic performance in the conversion of starch and inulin, and the yield of HMF reached 60.1% and 81.6% under identical conditions, respectively.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
BIOORGANIC CHEMISTRY
·
2021
·
IF 5.275
Fang Guo,Tao Xia,Ping Xiao,Qingyue Wang,Zhitong Deng,Wang Zhang,Guowang Diao
Pillar[5]arene complexes of the naturally occurring compound bisdemethoxycurcumin (BDMC) were acquired for improving the water solubility and stability of BDMC. As a family member of curcuminoid compounds, BDMC has many interesting therapeutic properties. However, its low aqueous solubility and stability resulted in poor availability and restricted the clinical efficacy. Pillar[5]arenes with hydrophilic ends and a hydrophobic cavity could include with BDMC based on size matching. The synthesized hydrazide-pillar[5]arene (HP5A) and BDMC had a strong host–guest interaction with a 1:1 binding stoichiometry. Furthermore, the HP5A ⊃ BDMC complex could self-assemble into well-defined fibers in water/ethanol solution. This supramolecular complex worked well in vitro for inhibiting the proliferation of hepatoma carcinoma cells HepG2. Remarkably, this method of complexation with pillar[5]arenes visibly reduced the undesirable side effects on normal cells without weakening the anti-cancer activity of the drugs. We expected that the obtained host–guest complex and fibrous assembly would provide a promising platform for delivering drugs with low water solubility.
研究领域:
药物化学
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肿瘤学
·
超分子化学
✓ 已验证
DOI
PubMed
高影响因子
Catalysts
·
2016
·Vol. 6
·期 9
·134
·
IF 2.964
Songbai Qiu,Ying Xu,Yujing Weng,Longlong Ma,Tiejun Wang
A series of MCM-41 supported Ni catalysts with high metal dispersion was successfully synthesized by simple co-impregnation using proper ethylene glycol (EG). The acquired Ni-based catalysts performed the outstanding hydrogenolysis activity of guaiacol. The effects of the synthesis parameters including drying temperature, calcination temperature, and metal loading on the physical properties of NiO nanoparticles were investigated through the use of X-ray diffraction (XRD). The drying temperature was found to significantly influence the particle sizes of NiO supported on MCM-41, but the calcination temperature and metal loading had less influence. Interestingly, the small particle size (≤3.3 nm) and the high dispersion of NiO particles were also obtained for co-impregnation on the mixed support (MCM-41:HZSM-5 = 1:1), similar to that on the single MCM-41 support, leading to excellent hydrogenation activity at low temperature. The guaiacol conversion could reach 97.9% at 150 °C, and the catalytic activity was comparative with that of noble metal catalysts. The hydrodeoxygenation (HDO) performance was also promoted by the introduction of acidic HZSM-5 zeolite and an 84.1% yield of cyclohexane at 240 °C was achieved. These findings demonstrate potential applications for the future in promoting and improving industrial catalyst performance.
研究领域:
催化化学
·
能源化学
·
材料化学
·
工业催化
·
生物质转化
✓ 已验证
DOI
高影响因子
NANO
·
2021
·
IF 1.556
Wenlong Li,Weiwei Zhang,Weihao Jin,Longbao Zhu,Wanzhen Li,Ping Song,Yugui Tao,Fei Ge
Design of high-performance drug delivery system is necessary to improve the anticancer ability of 5-fluorouracil (5-FU). In this work, we developed a pH-responsive 5-FU loaded and sodium alginate (SA) modified mesoporous silica nanoparticles (MSNs) drug delivery system (5-FU@MSN-SA). After 5-FU was loaded into the pores, MSNs were successfully functionalized with amino groups and then capped by sodium alginate. Compared to acidic conditions, the drug release rate in the neutral environment was quite low. Moreover, detailed investigations confirmed that 5-FU@MSN-SA can easily be up-taken by cancer cells and proved the high cytotoxicity to 4T1 cells. The calculated IC 5 0 values for 5-FU and 5-FU@MSN-SA were 34.67 μ g/mL and 54.95 μ g/mL, respectively. These results indicated that 5-FU@MSNs-SA can be a promising nanoplatform in cancer therapy.
研究领域:
药剂学
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肿瘤学
·
纳米医学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 41
·21479-21491
·
IF 3.708
Quanyi Wang,Shutao Xu,Jingrun Chen,Yingxu Wei,Jinzhe Li,Dong Fan,Zhengxi Yu,Yue Qi,Yanli He,Shuliang Xu,Cuiyu Yuan,You Zhou,Jinbang Wang,Mozhi Zhang,Baolian Su,Zhongmin Liu
In this work, two kinds of mesoporous ZSM-5 were synthesized successfully using a hydrothermal methodology by utilizing different soft templates, namely, dimethyl octadecyl [3-(trimethoxysilyl)propyl]ammonium chloride ([(CH3O)3SiC3H6N(CH3)2C18H37]Cl, TPOAC) and hexadecyl trimethyl ammonium bromide (C16H33(CH3)3NBr, CTAB). The obtained mesoporous ZSM-5 samples were compared with conventional ZSM-5, and the effects of different surfactant usages during the synthesis of mesoporous ZSM-5 on the physicochemical and catalytic properties were systematically investigated. Multiple techniques, such as XRD, SEM, N2 adsorption techniques, HP 129Xe NMR, 27Al MAS NMR, 29Si MAS NMR, and 1H MAS NMR, were employed for the characterization. Although the synthesized mesoporous ZSM-5 samples had equal surface areas, they presented different relative crystallinities, morphologies, pore-size distributions, micropore–mesopore interconnectivity, framework atom coordination states and acidities. When using these synthesized ZSM-5 samples as catalysts for methanol conversion, the mesoporous ZSM-5 templated with TPOAC exhibited an extremely long catalyst lifespan compared to conventional ZSM-5, while mesoporous ZSM-5 templated with CTAB showed no advantage in prolonging the catalyst lifetime during the reaction. The differences in the catalytic lifespan and the reduction of coke deposition were correlated to the variation of acidity and porosity with the mesopore generation in the ZSM-5 catalysts by the usage of different structure-directing agents. Compared to the mesopore structure-directing agent, CTAB, with the use of TPOAC as the template and part of the Si source, mesoporous ZSM-5 could be synthesized with good mesopore–micropore interconnectivity, which accounted for the improved catalytic performance in the reaction of methanol conversion.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 23
·3636-3643
·
IF 4.724
Zhenyou Gui,Wenrong Cao,Shunmugavel Saravanamurugan,Anders Riisager,Lifang Chen,Zhiwen Qi
Graphical Efficient noble alloy : Au–Pd supported on zinc hydroxycarbonate (ZOC) catalysts shows high activity for 5-hydroxymethylfurfural oxidation. The basicity of ZOC can play a crucial role in enhancing the yield of FDCA. Moreover, Au–Pd/ZOC can be recycled at least six times without significant loss of its activity. Bimetallic catalysts with Au–Pd supported on zinc hydroxycarbonate (ZOC) were synthesized by a simple deposition–precipitation method and analyzed by transmission electron microscopy to have a narrow-size distribution of predominantly 1–2 nm. The prepared Au–Pd/ZOC catalysts exhibited excellent activity towards 5-hydoxymethylfurfural (HMF) oxidation in water in the presence of the base NaHCO 3 at benign conditions of 80 °C and 3 bar O 2 , resulting in quantitative yield of 2,5-furandicarboxylic acid (FDCA). The addition of base not only enhanced the yield of FDCA but also stabilized the support ZOC by preventing ZOC from the reaction with formed carboxylic acid intermediates/products, thus allowing Au–Pd/ZOC to be recycled for at least six times without significant loss of activity. The basicity of ZOC could play an important role in obtaining the improved yield of FDCA as compared to other supports.
研究领域:
催化化学
·
绿色化学
·
化学工程
·
材料科学
·
有机合成
·
环境科学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 43
·e202202460
·
IF 2.307
Guohao Xu,Jiale Zhu,Xuedong Zhu
Graphical Compared with the microporous system of MoO 3 /ZSM-5 synthesized by the the physically-blended method, the micro-mesoporous system of ZSM-5@MoO 3 with a core-shell reaction pathway of Mo-acid sites tandem could accelerate the rate of the mass-transfer, promoting aromatization reaction. A novel core-shell ZSM-5@MoO 3 catalyst was successfully synthesized by the hydrothermal coating strategy, and its physicochemical properties and catalytic properties in methane aromatization were investigated using a physically-blended ZSM-5/MoO 3 catalyst as a comparison. Multitechniques including XRD, SEM, TEM, EDS, N 2 adsorption, ICP, IR and IG were employed to investigate the characteristics of methane aromatization reaction and the deactivation of carbon deposits. At the reaction temperature of 700 °C and a space velocity of 2400 mL g −1 h −1 , methane conversion and aromatics selectivity of the core-shell ZSM-5@MoO 3 catalyst were 11.3 % and 88.1 %, respectively, which were higher than those of the physically-blended ZSM-5/MoO 3 catalyst by 3.1 % and 14.8 %, respectively. The special reaction pathway of core (ZSM-5, acid sites)-shell (MoO 3 , Mo sites) and the relatively close proximity between MoO 3 and ZSM-5 were mainly responsible for the excellent properties in the methane aromatization reaction. At the same time, the formation of the micro-mesoporous property accelerated the mass-transfer rate and inhibited the formation of carbonaceous deposition, greatly improving the stability of methane aromatization. Thanks to its core-shell structure, ZSM-5@MoO 3 catalyst showed the excellent properties in methane aromatization.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2019
·
IF 3.173
Senlin Ma,Xingtao Zuo,Juan Xiong,Cong Ma,Zhongbing Chen
An ozonation process combined with hydrophobic adsorbent high silica ZSM-5 (HSZSM-5) was designed to enhance sulfamethoxazole (SMX) removal and reduce the ozone consumption. The promoted effect of HSZSM-5 on SMX removal was investigated in terms of SMX removal and TOC removal efficiency as well as the ozone consumption. The impacts of pH and CO 3 2− /HCO 3 - were also analyzed. The presence of HSZSM-5 helped to increase the SMX degradation and TOC removal efficiency and their kinetics rate constants. HSZSM-5 adsorption behaviors for SMX and its degradation intermediates were responsible for the findings. Direct ozone oxidation was the main mechanism of SMX removal as HZSM-5 could not contribute to producing H 2 O 2 and •OH. Much higher CO 3 2− /HCO 3 - concentration (≥10 mM) and pH value (>7) were in favor of SMX degradation. HSZSM-5 had a positive contribution to SMX removal. The mass ratio of ozone consumption to the removed SMX reduced to 0.63 g O 3 /g SMX. This system of introducing high silica zeolite in the ozonation/adsorption process is an environmentally and economically sound technology to removal micropollutants.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 1
·19-31
·
IF 2.496
Ge Lin,Wei Jianwen,Geng Linlin,Chen Siqi,Liao Lei
An amine-modified ZSM-5/SBA-16 (ZS) micro-/mesoporous composite was synthesized for CO 2 capture using nonionic tri-block copolymer pluronic (F127) as a template, tetraethyl orthosilicate (TEOS) as a silicon source and ZSM-5 zeolite as part of silicon aluminum source by embedding method. The amine-bifunctionalized samples were prepared by first grafting with aminepropyltriethoxysilane (APTES) and then impregnating with different concentrations of tetraethylenepentamine (TEPA). The amine efficiency, adsorption kinetics, thermal stability, regeneration performance and the effects of impregnated amine loadings (30–60%) and temperatures (30–90 °C) on the CO 2 adsorption performance were investigated using a thermal gravimetric analyzer (TGA) in the mixed gases (15 vol% CO 2 and the balance of N 2 ). The best adsorbent after modification of ZSM-5/SBA-16 composite material was screened to study CO 2 adsorption mechanism and adsorption kinetics. With the increase of the TEPA amount, the adsorption capacity of amine-bifunctionalized material first increased and then decreased. At 90 °C, the bifunctionalized ZSM-5/SBA-16 displayed the highest CO 2 adsorption performance of 1.630 mmol/g at the TEPA loading of 55%. The CO 2 adsorption mechanism of the bifunctionalized material was the synergistic effect of physical adsorption and chemical adsorption. After five adsorption/desorption cycle regenerations, the saturated adsorption capacity of the composite material was 1.496 mmol/g, which was only 8.2% lower than the original adsorption capacity. The composites exhibited good CO 2 adsorption performance, indicating the promising industrial applications for CO 2 capture form actual flue gas after desulfurization.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2017
·
IF 3.181
Miao Zuo,Kai Le,Zheng Li,Yetao Jiang,Xianhai Zeng,Xing Tang,Yong Sun,Lu Lin
5-Hydroxymethylfurfural (5-HMF) is one of the most important platform chemicals in biorefinery. In this work, an effective and green route for 5-HMF production in deep eutectic solvents (DESs) was demonstrated using extremely low concentration of hydrochloric acid as the catalyst. Moreover, the DES/acetonitrile (MeCN) biphasic reaction system adopted in this research showed excellent recyclability, which could be directly reused for multiple times without downgrading of the 5-HMF yield.
研究领域:
化学工程
·
生物炼制
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Qicheng Li,Xihu Zhao,Xiaobo Song,Juan Dong,Zhitong Zhao,Pan Hao,Qi Shi,Xuekuan Li
Benzene alkylation with syngas is attractive for alkylbenzene production, which use metals/metal oxides combining H-ZSM-5 zeolites as the catalyst. Herein, the H-ZSM-5 zeolites with three different morphologies—spindle-, flake-, and nano-sized—were synthesized. Subsequently, crystal structural, textural and acidic properties of three H-ZSM-5 zeolites and their corresponding bifunctional catalysts were characterized and the catalytic reaction activity and stability of the benzene alkylation with syngas were investigated. The bifunctional catalyst derived from nano-sized zeolites demonstrates an initial benzene conversion rate of 46.7% and reduces by 71.78% after 51 h of continuous operation, owing to abundant acid sites, large surface area and mesopores diameters, and balanced acidity to promote reactant and product diffusion. The spindle-shaped zeolite catalyst delivers the highest initial benzene conversion rate (53.77%) due to abundant acid sites. However, the benzene conversion rate drops to 12.12% of the initial value after 39 h due to limited micropore volume and relatively small mesopore diameters of the catalyst. The flake-shaped zeolite catalyst exhibits the lowest initial conversion rate and the shortest lifetime (30 h) owing to the fewest accessible acid sites and the peculiar pore structure. Three cases indicate that increasing mesopore volume is conducive to improve ratio of Brønsted to Lewis acid sites (B/L), resulting in enhancement of the catalytic activity. Meanwhile, the huge micropore volume and increased mesopore diameter are positive to alleviate pore blockage and coverage of active sites due to high mass-transfer efficiency within the zeolitic channels. These textural advantages collectively contribute to a delayed catalyst deactivation process and sustained catalytic activity. This work highlights the pivotal role of the H-ZSM-5 morphology in the benzene alkylation process with syngas and facilitates the efficient development of production process for non-oil alkylbenzene.
研究领域:
催化化学
·
材料化学
·
石油化工
·
多相催化
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）