ENERGY & FUELS
·
2023
·
IF 5.3
Cunshi Wang,Qiuzi Zhu,Zhimin Gao,Jianzhong Zhu,Liang Chen,Jianlong Liu,Wangjun Bai
The chemical absorption of CO2 using amine aqueous solutions is the most well-established and efficient approach to CCUS technology. However, these solutions can corrode carbon steel infrastructure, impacting production safety and cost-effectiveness. This study identifies a high CO2 loading (1.2561 mol mol–1) ternary system of 1,4-butanediamine (BDA), ethylene glycol (EG), and 70 wt % H2O (BE70H). The corrosion behavior and mechanism of BE70H on 20# carbon steel (20CS) were studied by weight loss test, ICP-OES analysis, electrochemical experiment, and various characterization techniques, with 30 wt % MEA solution was selected as a reference. The results show that the CO2-loaded amine solution is more corrosive to 20CS than the fresh solution. Fresh and CO2-saturated BE70H solutions (BE70HS) exhibited lower corrosion rates and lower iron concentrations. The characterization results showed that the surface of 20CS corroded by BE70HS formed a dense siderite (FeCO3) film. This film is believed to provide better corrosion inhibition than the chukanovite (Fe2CO3(OH)2) film formed in MEA-saturated solutions. The quantum chemical parameters, such as EHOMO, ELUMO, and ΔE, indicate that BDA molecules exhibit stronger adsorption on the surface of 20CS compared to MEA, effectively inhibiting the penetration of corrosive agents. The FeCO3 film and the adsorbed BDA layer on the 20CS surface are considered the major and minor pathways of corrosion inhibition, respectively. Furthermore, the phase separation behavior of the BE70H solution can potentially lead to differences in corrosiveness, making it a critical factor to consider in equipment anticorrosion design.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Siyu Ma,Zhihao Wang,Bowen Liu,Xiaolei Wang,Shichao Du,Zichen Song,Xinxin Bian,Manchen Hao,Ju Huang,Zhimin Chen,Zhiyu Ren
Pairing the hydrogen evolution reaction (HER) with the thermodynamics-friendly electrooxidation reaction (EOR) is a powerful way to maximize the energy/economic effectiveness, but still a challenge. Herein, the symbiotic Ni/MoN heterojunction arrays were constructed on foam (Ni/MoN/NF) by the nitridation-induced in situ reduction/conversion strategy. The fascinating interfacial electronic structure and surface reconstruction of Ni/MoN/NF heterojunction are responsible for the enhanced HMF-H 2 O paired electrolysis. Ni/MoN/NF only requires a low overpotential of 53 mV to reach the HER current density of 10 mA cm −2 , as well as the good durability; and NiOOH derived on the anode are electronically activated by MoN to achieving high-efficiency conversion from HMF to FDCA (∼100 % conversion, 97.5 % yield and 97.4 % Faradaic efficiency). For the HMF-H 2 O paired electrolysis, the assembled Ni/MoN/NF||Ni/MoN/NF electrolyzer only requires a low potential of 1.391 V to yield the current density of 10 mA cm −2 , ranking at the forefront in the reported coupling catalysts. Theoretical calculations manifest that the upshift of d -band center of the NiOOH/MoN heterojunction contributes to HMF chemisorption and activation, thereby enhancing its catalytic activity towards HMFEOR. Our study sheds light on the significance of designing the paired electrolysis with low voltage input for renewable energy applications.
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2021
·
IF 8.001
Ruoqing Wang,Feng Shen,Yiwei Tang,Haixin Guo,Richard Lee Smith,Xinhua Qi
Levulinic acid in high yields (90%) was produced from hemicellulose-derived furfuryl alcohol catalyzed by a uniform, dandelion-like, SO 3 H-modified silica nanoflower solid acid (SiNF–SO 3 H). The SiNF–SO 3 H catalyst was prepared by soft template method in microemulsion system, followed by grafting of –SH and oxidation of –SH to –SO 3 H at room temperature to avoid use of corrosive sulfonating agents such as concentrated H 2 SO 4 . Dandelion-like porous structures of the SiNF–SO 3 H catalyst provided accessible and abundant catalytic sites ensuring high activity for furfuryl alcohol conversion (100%). Mixed-solvent γ -valerolactone-water (GVL-H 2 O) inhibited undesirable furfuryl alcohol polymerization reactions ensuring highly selective conversion of furfuryl alcohol to levulinic acid. Combination of catalyst and solvent system allowed achievement of the highest levulinic acid yields that have been reported to date. Both the catalyst synthesis protocol and reaction solvent (GVL-H 2 O) are green and sustainable. The SiNF–SO 3 H/(GVL-H 2 O) catalytic system has application to many acid catalyzed schemes for lignocellulosic biomass conversion.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Xue-ping Zhang,Wei Wang,Han-zhong Zhang,Shi-hua Sang
In this paper, the stable phase equilibrium data of the ternary system CaBr2-SrBr2-H2O at T = 273, 298, and 323 K and 101.3 kPa have been determined by isothermal the dissolution equilibrium method. The phase diagrams of them at the investigated temperatures have been drawn. It is found that the isothermal phase diagrams of the CaBr2–SrBr2–H2O system at T = 273, 298, and 323 K are classified as a simple co-saturation type consisting of an invariant point and two univariant curves. The equilibrium solid phases corresponding to an invariant point of the system were detected as CaBr2·6H2O + SrBr2·6H2O at 273 and 298 K and those identified as CaBr2·4H2O + SrBr2·6H2O at 323 K. In this system, calcium bromide exhibits a strong salting-out effect on strontium bromide. Furthermore, isothermal solubilities at three temperatures were compared and discussed.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yunpeng Liu,Dongyan Shen,Qiao Zhang,Yuan Lin,Feng Peng
The artificial carbon dioxide (CO 2 ) photoreduction into useful chemicals utilizing solar energy demands the stable photocatalysts with high-efficiency charge separation and effective CO 2 adsorption capacity. For all this, for the first time, Bi 2 WO 6 photocatalysts with atomically thin structure along with hydrophobic and nonpolar surface are successfully designed and prepared using CTAB as assistant. The ultrathin feature with short diffusion distance significantly facilitates the charge separation. The hydrophobic surface, modified by nonpolar long carbon chains of CTA + , boosts both the mass-transfer and adsorption of CO 2 , meanwhile suppressing the H 2 O adsorption. Hence, the prepared photocatalyst exhibits a high-efficiency photocatalytic conversion of CO 2 in H 2 O vapor without co-catalyst due to high CO 2 concentration and sufficient photogenerated carriers. The photocatalytic mechanisms including adsorption concentration and activation process of CO 2 are further revealed by the in-situ diffuse reflectance infrared fourier transform spectra (DRIFTS). As a new feature, linearly adsorbed CO at 2035 cm −1 is found on hydrophobic surface of Bi 2 WO 6 , and the absorbance of CO is critical to the next reaction step for CH 4 generation. This innovation provides a facile avenue for the design of photocatalysts with remarkable CO 2 capture ability to achieve the practical application of photocatalytic CO 2 reduction.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 58
·期 7
·969-976
·
IF 0
Guangtao Qian,Haiquan Chen,Guangliang Song,Jianan Yao,Mengjie Hu,Chunhai Chen
To introduce intramolecular hydrogen bonds in the polyimides (PIs), 5(6)-amino-2-(5-aminopyridin-2-yl)-benzimidazole (PyPABZ) were designed and synthesized. The intramolecular interaction was indicated by Fourier transform infrared when different copolyimides were prepared with 4,4′-oxydianiline and PyPABZ. These modified poly(benzimidazole imide)s eliminate the problem of high water absorption for benzimidazole (BI)-containing PIs in the materials applications. Moreover, the high packing coefficient and rigidity of these copolyimides caused by the strong intramolecular interaction from the H-bonding and the resulting PIs exhibited outstanding thermal properties such as high glass-transition temperature ( T g ) and low coefficient of thermal expansion. Graphical The polyimides derived from 5(6)-amino-2-(5-aminopyridin-2-yl)-benzimidazole (PIs–PyPABZ) were achieved with the presence of intramolecular hydrogen bonding. These modified co-poly(benzimidazole imide)s exhibited lower H 2 O-absorption and higher thermal properties depending on the intramolecular H-bonding content.
✓ 已验证
产品关联
DOI
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Qing Hao,Huan Zhou,Mengli Zhang,Si Wu,Junfang Yang
Rare-earth ore concentrate is calcined at high temperature by the alkaline method, and the associated elements fluorine and phosphorus are enriched in the form of sodium fluoride and sodium phosphate in water elution. To separate and recover fluorine and phosphorus from the aqueous solution, the solid–liquid equilibrium behaviors of the quaternary systems Na+//F–, CO32–, PO43–-H2O and their two sub-ternary systems NaF-Na3PO4-H2O and Na2CO3-Na3PO4-H2O at 313.15 K were studied via the isothermal solubility phase equilibrium method. Solubility data, liquid density and pH, two complete isothermal phase diagrams of the ternary system, and one complete isothermal phase diagram of the quaternary system were obtained. The results showed that two double salts NaF·2Na3PO4·19H2O and Na3PO4·3Na2CO3·8H2O occurred in the respective ternary systems. Five solid species of one anhydrous salt of NaF, two hydrous salts of Na2CO3·H2O and Na3PO4·12H2O, and two double salts of Na3PO4·3Na2CO3·8H2O and NaF·2Na3PO4·19H2O were found in the quaternary system. The phase diagram of the quaternary system consisted of three invariant points, five crystallization regions, and seven univariate curves. Na3PO4 easily combined with NaF to form double salt NaF·2Na3PO4·19H2O, which occupied a larger phase region in the quaternary phase diagram. The increase in Na2CO3 will lead to the decrease in the solubility of Na3PO4 and NaF in the system.
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Peng Fei,Zhengli Guo,Chunlu Ye,Ziling Teng,Qiaoling Chen,Guoguang Zhang,Yuanhong Zhuang,Wenqiang Lai,Hanguo Xiong,Jie Cai
In this study, H 2 Ti 2 O 5 ·H 2 O nanotubes (TNTs) and Ce-doped titanate nanotubes (Ce-TNTs) were synthesised via hydro-thermal synthesis and incorporated into bamboo fibre/high-density polyethylene (HDPE) (BH) composites to enhance the flame retardance of these composites. Transmission electron microscopy (TEM), X-Ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses showed that Ce ions were well doped into the crystal lattice of TNTs, but these ions slightly affected the sizes of TNTs. Both 6 wt% TNTs and 6 wt% Ce-TNTs were well distributed in the bamboo fibre/HDPE matrix, and promoted the formation of a network structure in the BH composites. Cone calorimetry test and limiting oxygen index test indicated that TNTs enhanced the flame retardance of the BH composites. Compared to those of BH0, the time to ignition (TTI) of bamboo fibre/HDPE composites incorporating TNTs (BHT) was delayed from 29 s to 36 s, and peak heat release rate (pHRR), average heat release rate (av-HRR) and total heat release (THR) of BHT decreased from 658.6, 222.7 and 55.8 kW/m 2 to 503.0, 158.0 and 39.6 kW/m 2 , respectively. The improvement mainly attributed to adsorption effect of TNTs. When Ce-TNTs were used as a substitute for TNTs, the TTI of bamboo fibre/HDPE composites incorporating Ce-TNTs (BHC) composites were further delayed to 41 s, and pHRR, av-HRR and THR decreased to 399.1, 138.0 and 34.5 kW/m 2 , respectively.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2019
·Vol. 61
·期 1
·77-85
·
IF 0.907
Yanfei Wang,Mo Gaoming,He Liu,Huang Qing
Abstract Isothermal gelation processes for relatively low concentration PAN/DMSO/H 2 O solutions are studied by rheology. Winter–Chambon criterion is unitedly used to investigate the rheological kinetics and the structural and mechanical characteristics of the resulted gels are evaluated. It is found that during the isothermal gelation procedure, two coincident points appear sequentially, where loss tangent tan δ is independent of frequency. The occurrence of two coincident points suggests that the critical gel forms first, then it evolves into the second self-similar structure, and the average distance between crosslinks of network becomes shorter. The results also show that decreasing temperature, increase of PAN concentration or H 2 O content will lead to faster gelation kinetics and formation of more elastic and compact critical gel and the second self-similar structure. At the same temperature, the later formed second self-similar structure is always more elastic and compact than the critical gel, and the corresponding gel stiffness is stronger.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Chen Meng-qi,Xu Jie,Wei Yan,Hao Shuang-hong
The primary aim of this study is to develop a recovery process for PhSO3K from the industrial waste of Qpe (quizalofop-p-ethyl) production. The solubility data for the PhSO3K–K2CO3–H2O system at 15, 25, 35, 45, and 55 °C were determined to obtain the phase diagram of the system. Moreover, the different crystallization fields in the phase diagram of 25 °C were analyzed. The separation technology of PhSO3K from the PhSO3K–K2CO3–H2O system was designed based on the phase diagram. Furthermore, the PhSO3K and K2CO3 in a wastewater from Qpe production were crystallized in sequence by evaporation according to the designed method. The organic impurities precipitated concomitantly with PhSO3K were washed out by ethanol. Finally, the purified PhSO3K was converted to (R)-ethyl O-bezenesulfonyl lactate, the intermediate of Qpe production.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Song-Il O,Jun-Min Yan,Hong-Li Wang,Zhi-Li Wang,Qing Jiang
Ni/La 2 O 3 nanocatalyst with Pt and Rh content as low as 5 mol%, respectively, is successfully synthesized by a facile co-reduction method in the presence of hexadecyl trimethyl ammonium chloride aqueous solution under ambient atmosphere. Interestingly, the resulted Ni/La 2 O 3 catalyst with low cost exhibits excellent catalytic activity to dehydrogenation of hydrous hydrazine (N 2 H 4 ·H 2 O), producing hydrogen with 100% selectivity at room temperature (298 K), which represents a promising step toward the practical application for N 2 H 4 ·H 2 O system on fuel cells.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Xin Xiao,Huan Zhong,Chunxia Zheng,Mingli Lu,Xiaoxi Zuo,Junmin Nan
Novel flower-like WO 3 ·H 2 O micro/nano-architectures are conveniently synthesized via a low-temperature oil bath route, and its catalytic oxidative desulfurization (ODS) activity for dibenzothiophene (DBT) in a model oil is systematically evaluated within an n-octane/acetonitrile (MeCN) biphasic system in the presence of H 2 O 2 as an oxidizing reagent. The results indicate that DBT can be effectively removed using the as-synthesized WO 3 ·H 2 O catalyst in the presence of H 2 O 2 and that the catalytic process follows pseudo-first-order kinetics. Under optimal conditions, i.e., n(S/catalyst) = 5 and n(H 2 O 2 /S) = 8 at 70 °C, the sulfur content is diminished from 4000 to approximately 220 μg g −1 after 60 min of reaction. The mechanistic study reveals that the desulfurization route is dominated by direct catalytic oxidation rather than indirect oxidation by radicals. The oxidation product is dibenzothiophene sulfone (DBTO 2 ) with almost 100% selectivity, and it can quickly migrate into the MeCN phase due to its highly polar nature, resulting in the removal of DBT from the oil phase. By combining the experimental results with the theoretical DFT calculations, the crystal structure of WO 3 ·H 2 O and the electronic structures of DBT vs. DBTO 2 are considered to be the key roles in this synchronized adsorption-catalytic oxidation-extraction process. In addition, the as-synthesized WO 3 ·H 2 O is structural stable during the reaction and can be also used to remove 4,6-dimethyldibenzo-thiophene (DMDBT), benzothiophene (BT), and thiophene (Th) in fuel oils, suggesting its potential for practical applications.
✓ 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）