JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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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.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xiaoxian Li,Yuanzhe Gong,Qi Lu,Min Lin,Jian Liu,Yulong Wu
In this work, the hierarchical pore HZSM-5 zeolite was synthesized by the method of alkali treatment, and the bimetallic loading of Mo and Cu was investigated for the hydrothermal aromatization of stearic acid. After alkali treatment, the pore size of HZSM-5 increased, but the acid sites decreased. The metal loading reintroduced the Lewis acid sites, greatly increasing the ratio to Brönsted acid sites. Therefore, the treated catalyst achieved higher hydrothermal stability while maintaining the high activity of hydrothermal aromatization of stearic acid. Mo0.02Cu0.01/Z-0.2M achieved excellent activity in the stearic acid hydrothermal aromatization with a high overall TEX (toluene, ethylbenzene, and xylenes) yield of 50.19 wt %, including 10.30 wt % toluene, 3.82 wt % ethylbenzene, and 36.07 wt % xylene. In addition, Mo0.02Cu0.01/Z-0.2M still showed excellent catalytic activity while applied in the system of the simulated microalgal bio-oil. As the reactant changed to the mixture of stearic acid and hexadecanamide, an overall TEX yield of 34.11 wt % was obtained at 450 °C. These results demonstrate the excellent hydrothermal aromatization ability of the MoCu-supported hierarchical pore ZSM-5 zeolite, which provides the potential to produce value-added chemicals from algal biomass.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 10
·1505-1513
·
IF 4.803
Abuduwayiti Reyila,Ma Feng-Yun,Fan Xing
Four supported catalysts, nickel and ruthenium on a HZSM-5 support, were prepared by equal volume impregnation and in-situ decomposition of carbonyl nickel. The properties of catalysts were investigated by catalytic hydro-conversion of 2,2′-dinaphthyl ether as the model compound and extraction residue of Naomaohu lignite as the sample under an initial H 2 pressure of 5 MPa and temperature at 150 °C. According to the catalytic hydro-conversion results of the model compound, Ni—Ru/HZSM-5 exhibited the best catalytic performance. It not only activated H 2 into H⋯H, but also further heterolytically split H⋯H into immobile H − attached on the acidic centers of Ni—Ru/HZSM-5 and relatively mobile H + . Catalytic hydro-conversion of the extraction residue from Naomaohu lignite was further examined over the optimized catalyst, Ni—Ru/HZSM-5. Detailed molecular compositions of products from the extraction residue with and without hydrogenation were characterized by Fourier transform infrared spectroscopy and gas chromatography/mass spectrometry. The analytical results showed that the oxygen-containing functional groups in products of hydrogenated extraction residue were obviously reduced after the catalytic treatment. The relative content of oxygenates in the product with catalytic treatment was 18.57% lower than that in the product without catalytic treatment.
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CRYSTENGCOMM
·
2020
·Vol. 22
·期 37
·6182-6188
·
IF 3.117
Xueshuai Chen,Rongli Jiang,Huilin Hou,Zihan Zhou,Xingwen Wang
ZSM-5/SAPO-34 zeolite composites were successfully synthesized by adding ZSM-5 into SAPO-34 synthetic gel under hydrothermal synthesis conditions, and SAPO-34 as a part of the composite zeolite was synthesized from LAPONITE® as the Si source. The presence of ZSM-5 in the synthetic gel affects the nucleation and crystal growth rate, and core–shell structured zeolite composites can be formed by adding an appropriate amount of ZSM-5. LAPONITE® itself contains Li and Mg atoms which were subsequently introduced into the framework of the SAPO-34 part in the composites via depolymerization–reorganization during the process of crystallization. Furthermore, the depolymerized LAPONITE® can be converted in situ into zeolitic precursors and act as crystalline seeds under hydrothermal conditions. Compared with the ZSM-5/SAPO-34 zeolite composites synthesized from tetraethylorthosilicate (TEOS) instead of LAPONITE® as the Si source, the ZSM-5/SAPO-34 composites synthesized from LAPONITE® exhibited higher selectivity to light olefins and longer lifetime in the MTO reaction. This work provides a convenient route to the synthesis of ZSM-5/SAPO-34 zeolite composites with excellent MTO performance.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 7
·2097-2106
·
IF 1.408
Bai Ting,Zhang Xin,Liu Xiling,Chen Tengfei,Fan Wentao
A series of HZSM-5 catalysts were synthesized by different methods. The physicochemical properties of the HZSM-5 catalysts were characterized by XRD, SEM, N2 isothermal adsorption-desorption, NH3-TPD, Py-IR and TGA, respectively. The results indicated that different preparation conditions lead to different morphologies, textures and the distribution of acid sites. The nanosized HZSM-5 catalysts exhibited better catalytic reactivity and coke capacity than the micro-sized HZSM-5 because nanosized HZSM-5 had larger specific surface area, higher pore volume, more exposed channels and more accessible acid sites. The large particles of NZ-3 in a reasonable range and the smooth surface were conducive to product diffusion; therefore, NZ-3 exhibited higher specific propylene yield and stability than the other nanosized catalysts. The moderate density and distribution of acid sites on NZ-3 also favored the formation of propylene.
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ChemSusChem
·
2019
·Vol. 12
·期 5
·978-982
·
IF 7.804
Yunchao Feng,Guihua Yan,Ting Wang,Wenlong Jia,Xianhai Zeng,Jonathan Sperry,Yong Sun,Xing Tang,Tingzhou Lei,Lu Lin
Graphical MCM's grand : A series of MCM-41 supported metal catalysts (denoted M/D41) were prepared by using the deep eutectic solvent (DES)-mediated ionothermal synthesis strategy. Al/D41 showed excellent performance in the conversion of carbohydrates into 5-hydroxymethylfurfural (HMF). Production of HMF from glucose could be performed at high concentrations in choline chloride aqueous solution. A series of MCM-41 supported metal catalysts (denoted M/D41) were prepared by using the deep eutectic solvent (DES)-mediated ionothermal synthesis strategy. Al/D41 was found to have excellent performance in the conversion of carbohydrates into 5-hydroxymethylfurfural (HMF). Furthermore, the production of HMF from glucose could be performed at high concentrations in choline chloride aqueous solution (CAS; 32 wt %, relative to the reaction phase) and as a result, CAS is a more promising solvent than water and DES for HMF production.
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PubMed
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Kai Yan,Zhihao Yu,Yingqing Li,Mengyan Guo,Yuanyu Wang,Xuebin Lu
The efficient dehydration of fructose to 5-hydroxymethylfurfural (HMF) is a crucial step in biomass valorization, requiring solid acids with precisely balanced Brønsted acidity. Defect engineering in Zr-based metal–organic frameworks (MOFs), such as UiO-66, is well known to enhance Lewis acidity; however, its impact on tailoring Brønsted acid sites remains insufficiently understood. Here, we demonstrate that defective UiO-66 possesses a dual-origin Brønsted acid system, comprising intrinsic μ3–OH groups and water molecules coordinated to defect-generated Lewis acidic Zr centers (Zr–H2O). The concentration of these Brønsted acid sites can be finely regulated by thermal activation treatment. A volcano-shaped dependence of catalytic activity on activation temperature is observed, with an optimum at 200 °C. At moderate activation temperatures below 200 °C, the removal of physisorbed water exposes both μ3–OH and Zr–H2O sites, maximizing Brønsted acid density and HMF yield. Activation beyond 200 °C reduces both types of Brønsted acid sites, resulting in diminished catalytic performance. This study reveals the cooperative effect of defect engineering and thermal activation in tuning the Brønsted acidity of MOFs, providing a rational strategy for designing highly selective catalysts for the sustainable production of platform chemicals.
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产品关联
DOI
高影响因子
JOURNAL OF DENTISTRY
·
2025
·
IF 5.5
Lingkang Lin,Zhengyuan Yang,Shihui Yang,Qi Lin,Yanlin Zhu,Song Zhu
Objectives This study focused on assessing the impact of combined with glycolic acid (GA) and pyridoxal 5-phosphate (PLP) on the strength and stability of dentin bonding. Methods GA with 37% concentration was prepared as acid etch, and PLP of varying doses (0.5 wt%, 1.5 wt%, and 2.5 wt%) was used as a primer. Additionally, the demineralization ability of phosphoric acid (PA) and GA on the dentin surface was detected using scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) was used to analyze the cross-linking effect of PLP with demineralized dentin collagen, and the effect of PLP on the single bond universal’s degree of conversion. The adhesion property of dentin was assessed using testing micro-tensile bond strength (μTBS), endogenous matrix metalloproteinase (MMPs) activity, nanoleakage, and the morphology at the resin-dentin bonding interface, following 10,000 thermal cycles. Results SEM observation demonstrated that etching with 37% GA for 30 s could effectively demineralizing the dentin surface and the adhesive strength was equivalent to that of the PA group ( p > 0.05). In addition, adhesive strength after aging increased relative to the PA group ( p < 0.05). The FTIR analysis results exhibited that 1.5% PLP improved the conversion rate of adhesive and the effect of chemical binding with collagen fibers. The GA+1.5% PLP group significantly enhanced the bonding interface μTBS, effectively reducing the nanoleakage and activities of MMPs, with no significant difference before and after aging ( p > 0.05), demonstrating excellent aging resistance. Conclusions GA can effectively replace PA as an acid etching agent for treating the dentin surface. The bonding strength of the PA group and the nanoleakage results showed a significant decrease after aging. The combination of 37% GA+1.5% PLP not only demineralizes dentin rapidly but also facilitates cross-linking of collagen fibers to reduce degradation and enhance the bonding quality of the hybrid layer. Clinical significance Compared with the traditional PA etching method, the combined application of 37% GA with 1.5% PLP has made better improvements in maintaining the long-term durability of the bonding interface, providing a potential solution for etching and biologically modifying the dentin substrates.
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Haiwei Xu,Linghao Li,Jian Huang,Wei Wang,Siyu Yang,Haohao Gao,Suhui Chen,Haojian Zhang,Zile Hua
Hierarchically structured high-silica ZSM-5 nanozeolites with an average particle size of about 115 nm and abundant inter/intra-crystal mesopores were successfully synthesized via a new combination of dry-gel crystallization (DGC) and subsequent alkali-etching treatment. The alkali-etching process effectively introduced auxiliary intracrystal mesopores into the nanozeolite precursors, significantly increasing the specific surface area and total pore volume while maintaining appropriate surface acidity, which had been confirmed by comprehensive characterizations, e.g., XRD, N2 sorption isotherms, SEM, TEM, NMR, ICP-OES, and NH3-TPD. Benefiting from the developed three-dimensional interconnected micro/mesoporous structure, the resultant nanoZSM-5(200)_D catalyst exhibited superior performance in the methanol-to-propylene (MTP) reaction. It achieved 46% propylene selectivity and an exceptionally prolonged catalyst lifetime for 90% methanol conversion of 224 h (t90), which is approximately 3 times and 16 times that of the nanoZSM-5(200) precursor and purely microporous ZSM-5(200) counterpart, respectively. Additionally, the universality of the here-reported two-step procedure has also been proven, which offers a new choice for preparation of high-performance hierarchically structured zeolite catalysts.
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产品关联
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Shiyou Xing,Pengmei Lv,Che Zhao,Ming Li,Lingmei Yang,Zhongming Wang,Yong Chen,Shijun Liu
Non-H 2 and solvent-free catalytic conversion of waste lipids to liquid hydrocarbons is of great interest because of the associated low-cost, full-safety, and easy-operability. In this work, a solvent-free catalytic process for deoxygenating oleic acid was performed in H 2 and non-H 2 (N 2 , CH 4 , and CO 2 ) media over nano-Ni/HZSM-5. 8-Heptadecene, a primary product obtained at 320 °C in four media, was derived from the straightforward decarboxylation of oleic acid. In non-H 2 medium at 360 °C, the formation of C 8 –C 15 alkanes was enhanced, with yields of ca. 65.05 mol%, 70.71 mol%, and 73.09 mol% for N 2 , CH 4 , and CO 2 , respectively. A low yield of 49.67 mol% C 8 –C 15 alkanes in H 2 medium suggested that the H 2 medium reduced catalytic cracking . This was due to the preferential formation of stable heptadecane from 8-heptadecene in the presence of abundant H 2 . The absence of H 2 favored the cracking of 8-heptadecene. These cracked products were further converted to C 8 –C 15 alkanes, for which a mass supply of hydrogen was mandatory. Gas-phase reactions including methanation , Fisher-Tropsch (F-T) synthesis, and water-gas shift (WGS) reactions between deoxygenated gas products and reaction media provided significant pathways for the hydrogen required for the formation of alkanes. The CH 4 medium also acted as a hydrogen source due to its decomposition, catalyzed by nano-Ni/HZSM-5. Coke was substantially formed in all the four media. It was highlighted that the medium of H 2 favored the formation of aliphatic cokes, whereas the non-H 2 media, particularly the CO 2 medium, facilitated aromatic coke species on account of its weak oxidizability. Additionally, there was a severe loss of loaded Ni nanoparticles under H 2 medium but a slight Ni loss in CO 2 medium, which was proposed to the reason of aromatic cokes formation at the catalyst surface , acting as a trap for the loaded Ni nanoparticles.
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高影响因子
INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Bing-Ping Yang,Chun-Li Hu,Fei-Fei Mao,Xiang Xu,Jiang-Gao Mao
Two new barium gold iodates, namely, BaAu(IO3)5 and HBa4Au(IO3)12, have been prepared. BaAu(IO3)5 crystallizes in the polar space group Pca21, whereas HBa4Au(IO3)12 crystallizes in the centrosymmetric space group P21/c. BaAu(IO3)5 consists of unique polar [Au(IO3)4]− anions whose four iodate groups are located at both sides of the AuO4 plane and the polarity points in the [001̅] direction. BaAu(IO3)5 displays strong second-harmonic-generation (SHG) effects about 0.6KTiOPO4 (KTP) and is phase-matchable. Thermal properties, optical spectra analyses, and theoretical calculations are also reported.
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高影响因子
ENERGY & FUELS
·
2016
·
IF 2.835
Zhenzhen Yang,Wei Qi,Rongxin Su,Zhimin He
Selective synthesis of various versatile compounds from biomass is of great importance to replace traditional fossil fuel resources. A novel magnetic catalyst, ZnFe1.65Ru0.35O4, was prepared via a simple alkali-coprecipitation method. The structure of the as-prepared catalyst was characterized, and its catalytic performance was investigated for aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) and 2,5-furandicarboxylic acid (FDCA) under different reaction conditions. A high DFF yield of 93.5% was obtained for the reaction at 110 °C for 4 h in dry DMSO, whereas the maximum FDCA yield of 91.2% was achieved for the reaction at 130 °C for 16 h in H2O/DMSO (1:2, v/v). More importantly, a plausible reaction pathway was proposed for the aerobic oxidation of HMF into FDCA, with the rate-determining step determined through kinetic study. In addition, DFF or FDCA could be produced from fructose by sequentially using a magnetic solid acid (Fe3O4–RGO–SO3H) and ZnFe1.65Ru0.35O4. The dehydration of fructose in the presence of Fe3O4–RGO–SO3H resulted in HMF. After the removal of Fe3O4–RGO–SO3H from the reaction solution with a magnet, HMF was further oxidized in the catalysis of ZnFe1.65Ru0.35O4. These two consecutive steps gave DFF in 73.3% yield and FDCA in 70.5% yield, under the respective optimum reaction conditions. The direct synthesis of DFF or FDCA from fructose avoids tedious separation of intermediate HMF, leading to savings, with regard to both time and cost.
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