Catalysis Science & Technology
·
2018
·Vol. 8
·期 16
·4241-4256
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IF 5.365
Xiaochao Xian,Chao Ran,Peng Yang,Yirong Chu,Shuo Zhao,Lichun Dong
The effect of the acidity of HZSM-5/MCM-41 hierarchical zeolite on its catalytic performance in the supercritical catalytic cracking of n-dodecane was investigated by controlled ion exchange with NaCl solution under ultrasonic conditions. XRD and nitrogen adsorption–desorption results showed that the crystal and porous properties were not affected, while NH3-TPD, the probe reaction of n-hexane cracking and temperature-programmed surface reaction (TPSR) of n-dodecane demonstrated that strong Brønsted acid sites were replaced by Na+ (weak Lewis acid sites) to different extents with varying concentrations of NaCl solution. Although the initial conversion of n-dodecane during the supercritical catalytic cracking was slightly reduced, its stability was greatly enhanced by ion exchange. An ultrastable catalyst with no obvious deactivation within 3 h of time on stream (TOS) was obtained by ion exchange with 0.8 M NaCl solution. A mechanism describing the role of the acid sites residing in both micropores and mesopores of the hierarchical catalyst was proposed based on coke analysis.
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Analytical Methods
·
2012
·Vol. 5
·期 3
·666-672
·
IF 1.547
Chunli Yang,Yaqin Chai,Ruo Yuan,Wenju Xu,Shihong Chen
In this report, gold nanoparticle–graphene nanohybrids (Au–GR) and 3-amino-5-mercapto-1,2,4-triazole-functionalized multiwall carbon nanotubes (MWCNT–SH) were synthesized. And a novel hybrid material MWCNT–SH@Au–GR was obtained by the interaction between gold nanoparticles of two dimensional (2D) Au–GR and SH groups of 1D MWCNT–SH. Due to the synergistic effects between MWCNT–SH and Au–GR and excellent film forming ability of MWCNT–SH@Au–GR, the obtained MWCNT–SH@Au–GR was used as a modifier to fabricate a chemically modified electrode for the simultaneous determination of hydroquinone (HQ), catechol (CC), resorcinol (RC) and nitrite (NO2−). Scanning electron microscopy (SEM) was employed to characterize the morphology of MWCNT–SH@Au–GR. The electrochemical behavior of the sensor was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. Results showed that it was feasible to simultaneously measure HQ, CC, RC and NO2−. The linear response ranges for HQ, CC, RC and NO2− were 54.5–1250.5 μM, 11.0–126.0 μM, 43.5–778.5 μM and 86.0–7500.0 μM and the detection limits (S/N = 3) were 4.17 μM, 1.00 μM, 7.80 μM and 23.5 μM, respectively.
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DALTON TRANSACTIONS
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2015
·Vol. 44
·期 47
·20562-20567
·
IF 4.197
Su-Yun Zhang,Wen-Bin Guo,Ming Yang,Ying-Ying Tang,Mei-Yan Cui,Nan-Nan Wang,Zhang-Zhen He
Cu5(VO4)2(OH)4 (turanite) is a layered compound, exhibiting a copper(II) oxide layer in the [0 1 1] plane composed of edge-sharing CuO6 octahedra. Each Cu–O layer is further separated by VO4 tetrahedra. Closer scrutiny found that the copper(II) oxide layer in the compound represents a totally new geometrically-frustrated lattice, a 1/6 depleted triangular lattice. More specifically, the spin network in the [0 1 1] plane is formed by the alternate ranking of triangular and honeycomb strips. Magnetic measurements show that the Cu5(VO4)2(OH)4 behaves as a spin-1/2 ferrimagnet with a Tc = ∼4.5 K. It exhibits an unusual 1/5 magnetization plateau arising from the competition between antiferromagnetic and ferromagnetic interactions caused by the strong frustration. The possible spin-arrangements are also suggested.
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PubMed
高影响因子
DESALINATION
·
2013
·
IF 3.041
Ben Zhang,Dapeng Zhou,Xiaogai Lv,Ying Xu,Yuanchen Cui
A novel scale and corrosion inhibitor , polyaspartic acid/3-amino-1H-1,2,4-triazole-5-carboxylic acid hydrate graft copolymer was synthesized by maleic anhydride , urea and 3-amino-1H-1,2,4-triazole-5-carboxylic acid hydrate. The graft copolymer possesses good corrosion inhibition properties and outstanding scale inhibition performance for CaCO 3 , Ca 3 (PO 4 ) and CaSO 4 in the simulation experiment. The inhibition efficiency of graft copolymer is close to 100% for Ca 3 (PO 4 ) scale, polyaspartic acid (PASP) and only 22% when inhibitor concentration is 12 mg/L. Moreover, the inhibition corrosion efficiency can reach up to 75%, with PASP just 45% when inhibitor concentration is 16 mg/L.
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RSC Advances
·
2017
·Vol. 7
·期 24
·14330-14336
·
IF 3.108
Minghao Li,Wenzhi Li,Yijuan Lu,Hasan Jameel,Hou-min Chang,Longlong Ma
Biomass derived 5-hydroxymethylfurfural (HMF) is regarded as an important platform molecule for the synthesis of value-added chemicals and fuels, but the high production cost has always been a bottleneck for the industrial scale use of HMF. Different mineral acids (HCl and H2SO4) being used as the catalyst and different salts being used as the reaction promoter were evaluated. It was found that HCl, in combination with NaCl, in a water/γ-valerolactone system showed high selectivity and impressive efficiency for the synthesis of HMF from glucose. The optimal conditions to obtain the best HMF yield (62.45%) were 0.2 M HCl and 0.1 M NaCl at 140 °C with a residence time of 60 minutes. An 18.22% molar yield of LA was obtained as a by-product. The effect of different anions was also investigated, and it was determined that not only the hydrogen ions, but also the nature of the acid and the type of salt played a joint role in improving the HMF yield. In addition, a possible synthesis pathway was proposed for large scale production of HMF.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Chenxi Lu,Bingqing Hu,Liangzhi Li,Xin Ju,Lishi Yan
5-hydroxymethylfurfural (5-HMF) is a key platform chemical that can be applied to generate varied value-added products. Herein, the sulfonated zirconium/tin Mixed-Metal metal–organic frameworks (MOFs), Sn/UiO-66-SO 3 H catalysts were employed for catalytic conversion of biomass-derived carbohydrates (glucose, sucrose, maltose, starch, and cellulose) to 5-HMF in green deep eutectic solvents (DESs)-water based biphasic system. The Sn/UiO-66-SO 3 H catalysts were prepared by infiltrating Sn 4+ into the UiO-66-SO 3 H via post-synthesis modification. The synthesized catalysts were characterized by PXRD, SEM, FTIR, N 2 adsorption–desorption analysis, XPS, ICP-OES, NH 3 -TPD and Py-FTIR. The synergistic effect of Zr 4+ and Sn 4+ increased the total acidity and pore size of MOFs, thus promoting the catalytic performance of MOFs towards carbohydrates conversion to 5-HMF. The 24-Sn/UiO-66-SO 3 H with impregnation of Sn 4+ for 24 h presented desired catalytic ability, which resulted in 81.5 % and 41.7 % 5-HMF yields from glucose and cellulose in DES betaine-malic acid–water/MIBK biphasic system, respectively. Moreover, the five-recycling test for 24-Sn/UiO-66-SO 3 H demonstrated excellent reusability of the prepared catalyst. This study offered a novel sulfonated Mixed-Metal strategy on MOFs in DES betaine-malic acid–water based biphasic system for the production of 5-HMF from biomass-derived carbohydrates.
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APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Hao Chen,Jinshan Shen,Kequan Chen,Yong Qin,Xiuyang Lu,Pingkai Ouyang,Jie Fu
The oxidation of 5-hydroxymethylfurfural (5-HMF) to 2,5-furandicarboxylic acid (2,5-FDCA) under base-free condition is one of the most attractive reactions. This work first reported the synthesis of highly efficient oxidation of 5-HMF to 2,5-FDCA catalyst using the atomic layer deposition (ALD) to deposit Pt nanoparticles on low surface area zirconium oxide (ZrO 2 ). Pt/ZrO 2 synthesized by ALD showed excellent activity for the oxidation of 5-HMF to 2,5-FDCA in base-free solution compared with Pt/MO x synthesized by other methods in this work or reported already. The highly dispersed and uniform particle size of Pt particles were demonstrated by transmission electron microscopy (TEM), X-ray diffraction (XRD) and temperature programmed desorption of CO (CO-TPD), which provided a striking improvement of the catalytic activity in the oxidation of 5-HMF. An enhanced C O adsorption property of Pt/ZrO 2 obtained by ALD was also characterized by CO-TPD. The enhanced adsorption property of C O facilitated a stronger adsorption between catalyst and reactant/intermediates, which associated with the high dispersion and uniform particle size distribution of Pt particles to make the adsorbed reactant be efficiently converted to 2,5-FDCA.
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Frontiers in Genetics
·
2022
·
IF 4.772
Sheng Huan,Miao Chen,Sumin Sun,Yanling Zhong,Yu Chen,Yihao Ji,Guoping Yin
Lung squamous cell carcinoma (LUSC) is one of the most lethal cancers worldwide. Traditional tumor-node-metastasis (TNM) staging system has many insufficiencies in predicting immune characteristics, overall survival (OS), and prognosis of LUSC. LncRNA is currently found involved in tumor development and effectively predicts tumor prognosis. We screened potential tumor-related lncRNAs for immune characteristics and constructed a nomogram combining lncRNA and traditional clinical indicators for prognosis prediction. We obtained the large-scale gene expression profiles of samples from 492 LUSC patients in The Cancer Genome Atlas database. SPATA41, {"type":"entrez-nucleotide","attrs":{"text":"AL034550.2","term_id":"4455434","term_text":"AL034550.2"}} AL034550.2 , {"type":"entrez-nucleotide","attrs":{"text":"AP003721.2","term_id":"28189463","term_text":"AP003721.2"}} AP003721.2 , {"type":"entrez-nucleotide","attrs":{"text":"AC106786.1","term_id":"18139336","term_text":"AC106786.1"}} AC106786.1 , and {"type":"entrez-nucleotide","attrs":{"text":"AC078889.1","term_id":"9743414","term_text":"AC078889.1"}} AC078889.1 were finally screened to construct a 5-lncRNA-based signature. The risk score of the signature divided patients into subgroups of high-risk and low-risk with significant differences in OS. Their area under the curve (AUC) reached more than 0.70 in 1, 3, and 5 years. In addition, compared with the high-risk subgroup, the low-risk subgroup exhibited a remarkably favorable prognosis and TME score, along with a higher immune infiltration score and lower TIDE score. The signature also significantly related to chemotherapy response, especially in cisplatin, vinorelbine, and paclitaxel. Importantly, the nomogram we constructed had good reliability with the assessment of the calibration chart and consistency index (c-index). GO and KEGG enrichment analysis indicated that co-expression mRNAs of the 5 lncRNAs were mainly focused on RNA splicing, DNA replication, and protein serine/threonine kinase activity. Functional assays demonstrated that SPATA41, one of the five OS-related lncRNAs, regulated invasion, migration, proliferation, and programmed death in vitro . In summary, our 5-lncRNA-based signature has a good performance in predicting immune characteristics and prognosis of LUSC patients.
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PubMed
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Shanshan Shao,Yu Cao,Jiaxin Jiang,Xiaohua Li,Yongbo Yu
In this study, metal-loaded HZSM-5 was prepared with metal ion extracted from the cathode materials of spent lithium batteries (lithium iron phosphate, LFP; lithium nickel-cobalt manganate, NCM) with citric acid for the improved production of light aromatic hydrocarbons by catalytic pyrolysis of rape straw. Because of the dealuminization effect of citric acid on HZSM-5, mesopores were introduced, and the diffusion and conversion of pyrolysis gas over acid sites were improved. After metal loading with acid-leaching solution, the amount of weak and total acids in metal-loaded HZSM-5 increased a lot, which was conducive to the dehydration, deoxygenation, decarbonylation and aromatization of pyrolysis, and the production of monocyclic aromatic hydrocarbons (MAHs). With 0.1 mol/L citric acid for LFP and NCM treatment, the metal-loaded catalyst showed a higher yield of benzene, toluene and xylene (BTX) of 11.10 wt% during catalytic pyrolysis of rape straw. Compared with 0.1-NCM-H5, a higher yield of MAHs was obtained over 0.1-LFP-H5 with a more favorable pore structure and higher amounts of weak and total acid sites. In general, the high-valued utilization of agricultural wastes and spent lithium batteries was realized in this study to produce clean energy.
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JOURNAL OF MEDICINAL CHEMISTRY
·
2024
·
IF 6.8
Bei Zhang,Zhong-Kai Zou,Jian-Fan Cai,Wen-Ming Tan,Jun-Wei Chen,Wei-En Li,Jing-Nan Liang,Wei-Pei Wu,Gang Wang,Xiao-Hong Ruan,Pei-Liang Zhao
Phosphodiesterase 5 (PDE5) is a cGMP-specific hydrolytic enzyme and widely distributed in versatile tissues. PDE5 has been identified as a valid therapeutic target for treating erectile dysfunction and pulmonary arterial hypertension (PAH). Herein, a hit-to-lead structural optimizations were performed on the PDE1 inhibitor 10c, leading to compound 14b possessing great potency against PDE5A (IC50 = 3 nM) with high selectivity over PDE1, PDE2, PDE3, PDE4, PDE7, PDE8, PDE9, PDE10, and PDE11 by more than 1125-fold, and remarkable safety properties. Furthermore, oral administration of 14b (5.0 mg/kg) exerted much better pharmacodynamics effects on both mPAP (mean pulmonary artery pressure) and RVHI (index of right ventricle hypertrophy) than sildenafil citrate (10.0 mg/kg) in a monocrotaline-induced PAH rat model. Overall, these results proposed a novel highly selective PDE5 inhibitor 14b which could serve as a potential candidate for treatment of PAH.
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APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Feng Lin,Yulong Ma,Yonggang Sun,Xiuqin Men,Yingbo Zhu,Tingting Gao,Kanghe Zhao
Strategies for catalytic lignin depolymerization to yield ethylbenzene chemicals are green, sustainable and environmentally friendly methods. In this study, a series of Ni-CeO 2 /H-ZSM-5 catalysts were prepared via the precipitation method, which catalytically degraded the β-O-4 chemical bonding structure to yield ethylbenzene chemicals. The 2-(2-methoxy-phenoxy)-1-phenylethanol substance (β-O-4) was selected as a typical lignin model compound for the investigation of the intrinsic depolymerization mechanism and the catalytic performance. The results demonstrated that the introduced CeO 2 active phase can effectively promote the catalytic conversion of the β-O-4 chemical bonding structure to ethylbenzene chemicals. Physicochemical data demonstrate that the reaction pathways and hydrogenation selectivity were effectively regulated and controlled by the tuning of the dehydration and hydrogenolysis processes via the introduction of CeO 2 , which realized the selective adjustment of the redox properties and the surface valence states of active species in the catalytic process due to its excellent oxygen transfer performance.
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高影响因子
FUEL
·
2024
·
IF 6.7
Zhonghai Liu,Kaili Wang,Yayun Pang,Chenglei Xiao,Xiaoping Wu,Jinliang Song,Tiejun Wang
One-pot dehydration-oligomerization of biomass-derived alcohols provides a promising strategy for the production of renewable jet fuels, but it is still a great challenge. In this study, the hierarchically porous plate-like HZSM-5 catalysts were constructed to catalyze dehydration-oligomerization of higher alcohols derived from upgrading of fermentation ethanol. It was observed that the P40(0.2) catalyst showed the best performance with the C 8 -C 16 products selectivity of 66.4%. Systematic investigations revealed that the outstanding performance of P40(0.2) originated mainly from the synergistic effect of the finely tuned acidity and the hierarchical porous plate-like structure. Notably, the good activity of P40(0.2) on dehydration-oligomerization of the actual oil phase from ethanol upgrading confirmed the great potential of practical applications for the synthesis of jet fuels from biomass-derived alcohols.
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