ACS Omega
·
2021
·
IF 3.512
Runtian He,Teng Ma,Jiong Cheng,Binbin Jin,Jing Xu
Formation of formic acid from renewable biomass resources is of great interest since formic acid is a widely used platform chemical and has recently been regarded as an important liquid hydrogen carrier. Herein, a novel approach is reported for the conversion of glucose, the constituent carbohydrate from the cellulose fraction of biomass, to formic acid under mild hydrothermal conditions with simultaneous reduction of Ag2O to Ag. Results showed that glucose was selectively converted to formic acid with an optimum yield of 40.7% and glycolic acid with a yield of 6.1% with 53.2% glucose converting to carbon dioxide (CO2) immediately at a mild reaction temperature of 135 °C for 30 min. In addition, Ag2O was used as a solid oxidant for glucose oxidation, which avoids the use of traditionally dangerous liquid oxidant H2O2. Furthermore, complete conversion of Ag2O to Ag can be achieved. This study not only developed a new method for value-added chemical production from renewable biomass but also explored an alternative low-carbon and energy-saving route for silver extraction and recovery.
研究领域:
化学工程
·
可再生资源利用
✓ 已验证
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 5
·1161
·
IF 4.6
Jia Fang,Kejian Wang,Peng Chen,Xilong Xu,Chengzhuang Zhang,Yi Wu,Yan Yan,Zinong Zuo
In this study, a series of cerium dioxide catalysts with varying hydrothermal temperatures and times were synthesized using the hydrothermal method, without the use of templates. The impact of varying hydrothermal conditions on the activity of cerium dioxide catalysts was investigated through experiments to examine their oxidation characteristics in soot combustion. Among the conditions tested, the hydrothermal conditions of 140 °C and 6 h yielded the most optimal catalytic oxidation of soot, with a combustion characteristic temperature ( T p ) of 552 °C and a reduction of 122.9 °C. The integrated combustion index ( S ) and combustion stability coefficient ( R w ) were found to be 27.97 × 10 8 % 2 min −2 °C −3 and 90.76 × 10 5 , respectively. The indices of S and R w exhibited an improvement of 51.1% and 36.93%, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE RESEARCH
·
2024
·
IF 2.4
Yulong Chang,Yongtai Wang,Yimo Feng,Xiangling Zhu,Hongjun Zang
The “shell biorefinery,” which valorizes the shell waste chitin into fine chemicals, has developed rapidly in recent years. Herein, we present a novel base-free heteropolyacid-catalyzed oxidation method for the transformation of chitin biomass into organic acid. After a series of optimization experiments, a 5.93 % yield of formic acid and 25.09 % yield of acetic acid were achieved in the presence of 0.5 equivalent of Mo–V–P heteropolyacids (H 4 PMo 11 VO 40 ·2H 2 O) and air at 180 °C under hydrothermal conditions for 4 h. Meanwhile, we have demonstrated that the Keggin-type heteropolyacid catalysts are capable of efficiently converting microcrystalline chitin into organic acids. The synthesized heteropolyacids are well characterized with FT-IR, XRD, ICP-AES, and TGA. The possible reaction pathway was speculated accordingly. This method offers several advantages, including readily available raw materials, simple operation, and relatively higher yield.
研究领域:
生物化学
·
可持续化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Binbin Jin,Ligang Luo,Longfei Xie
The utilization of CO2, as a cheap and abundant carbon source to produce useful chemicals or fuels, has been regarded as one of the promising ways to reduce CO2 emissions and minimize the green-house effect. Previous studies have demonstrated that CO2 (or HCO3–) can be efficiently reduced to formic acid with metal Fe under hydrothermal conditions without additional hydrogen and any catalyst. However, the pathways and kinetics of the autocatalytic CO2 reduction remain unknown. In the present work, the reaction kinetics were carefully investigated according to the proposed reaction pathways, and a phenomenological kinetic model was developed for the first time. The results showed that the hydrothermal conversion of HCO3– into formic acid with Fe can be expressed as the first-order reaction, and the activation energy of HCO3– is 28 kJ/mol under hydrothermal conditions.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 16
·期 6
·3305-3312
·
IF 6.852
Yuhe Liao,Qiying Liu,Tiejun Wang,Jinxing Long,Longlong Ma,Qi Zhang
The selective transformation of cellulose to C6 alditols provides a feasible route towards the sustainable synthesis of chemicals and fuels. Herein, the catalytic performance of amorphous zirconium phosphate (ZPA) combined with 5 wt% Ru/C was evaluated in the direct conversion of cellulose to C6 alditols (sorbitol and mannitol) under hydrothermal conditions. The yield of C6 alditols reached 63.5% and 85.5% with microcrystalline cellulose and ball-milled cellulose as the feedstock, respectively. This hybrid catalyst was developed to convert concentrated cellulose to obtain C6 alditols with a high concentration of 68.8 mg mL−1 in the final products. The high yield of C6 alditols from cellulose was ascribed to the fact that ZPA favoured the adsorption of cellulose and promoted its depolymerization to cellobiose and glucose, which was hydrogenated immediately to C6 alditols over Ru/C. The weak adsorption of C6 alditols over ZPA inhibited the dehydration of C6 alditols to sorbitan. Furthermore, ZPA exhibited excellent hydrothermal stability and could be reused for several runs.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Mi Yan,Jianyong Liu,Dwi Hantoko,Ekkachai Kanchanatip,Nurak Grisdanurak,Yi Cai,Zengliang Gao
This paper presents the results from experimental study of syngas production by catalytic cracking of tar in wastewater under supercritical condition . Ni/Al 2 O 3 catalysts were prepared via the ultrasonic assisted incipient wetness impregnation on activated alumina , and calcined at 600 °C for 4 h. All catalysts showed mesoporous structure with specific surface area in a range of 146.6–215.3 m 2 /g. The effect of Ni loading (5–30 wt%), reaction temperature (400–500 °C), and tar concentration (0.5–7 wt%) were systematically investigated. The overall reaction efficiency and the gas yields, especially for H 2 , were significantly enhanced with an addition of Ni/Al 2 O 3 catalysts. With 20%Ni/Al 2 O 3 , the H 2 yield increased by 146% compared to the non-catalytic experiment. It is noteworthy that the reaction at 450 °C with the addition of 20%Ni/Al 2 O 3 had a comparable efficiency to the reaction without catalyst at 500 °C. The maximum H 2 yield of 46.8 mol/kg tar was achieved with 20%Ni/Al 2 O 3 at 500 °C and 0.5 wt% tar concentration. The catalytic performance of the catalysts gradually decreased as the reuse cycle increased, and could be recovered to 88% of the fresh catalyst after regeneration. 20%Ni/Al 2 O 3 has a potential to improve H 2 production, as well as a good reusability . Thus, it is considered a promising catalyst for energy conversion of tar in wastewater.
研究领域:
能源化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Shangying Li,Hongping He,Qi Tao,Yunfei Xi,Aiqing Chen,Shichao Ji,Chaoqun Zhang,Yiping Yang,Jianxi Zhu
In this study, beidellite , paragonite and other 2:1 type layered aluminosilicates with high layer charges (2:1 type LA-HLC) were synthesized under hydrothermal conditions by using boehmite as a precursor. The concentrations of dissolved Al from boehmite precursor had important effects on the mineral components of the hydrothermal products and the layer charge density of the resultant minerals. A combination of 2:1 type LA-HLC, paragonite, and minor beidellite formed at a relatively high concentration of dissolved Al, while beidellite with a small amount of 2:1 type LA-HLC was produced at a low concentration of dissolved Al. The resultant 2:1 type LA-HLC exhibited poor swelling ability when treated with ethylene glycol. A solid-state transformation mechanism was proposed for the transformation based on the HRTEM images and EDS analyses, which showed that lattice fringes representing (001) faces of 2:1 type layered aluminosilicates (2:1 type LA) were parallel to the (020) direction of boehmite. The successful transformation of boehmite into 2:1 type LA provides insights to well understand the formation of 2:1 type LA in geological processes and offer a facile preparation approach for the synthesis of 2:1 type LA with different layer charges.
研究领域:
地质学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOMASS & BIOENERGY
·
2021
·
IF 5.061
Xin Cai,Zhaoxia Zhang,Yueyuan Ye,Duo Wang,Shuirong Li,Dechao Wang,Zhifeng Zheng
Utilizing waste lipids to produce renewable diesel has received widespread attention, but the traditional preparation process is limited by rigorous reaction conditions or complex catalytic systems . This study reports a simple acid addition method to improve the conversion of higher fatty acids and/or higher fatty acid esters into long-chain alkanes under mild hydrothermal conditions over commercial Ru/C catalyst. The pretreatment of water-containing lipids, as well as the preparation process of complex catalysts are avoided, and the scope of applicable raw materials is expanded and the reaction system is simplified. This catalytic system is suitable for the conversion of most lipid materials into long-chain alkanes. Under the optimized conditions, stearic acid is converted completely with 97.85% selectivity of long-chain alkanes at 180 °C for 3 h. The catalytic system maintained excellent activity during the five repeated reactions.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Earth and Space Chemistry
·
2022
·
IF 3.556
Shangying Li,Hongping He,Qi Tao,Peixin Du,Aiqing Chen,Yilin He,Jianxi Zhu
2:1 type layered aluminosilicates (LAs) such as beidellite, montmorillonite, and paragonite distribute widely in the various environments of the Earth, and they form commonly through the transformation of other minerals under hydrothermal or weathering conditions. Understanding the growth mechanisms of 2:1 type LAs during mineral transformation is of great importance for profoundly revealing their formation processes in the geological environments and a better understanding of the formation of crystal defects within minerals, however, which is not thoroughly revealed. In this study, the transformation of boehmite into 2:1 type LAs was successfully realized under hydrothermal conditions, and the growth mechanisms of 2:1 type LAs during such a mineral transformation were explored using spectroscopic and microscopic characterizations. The results indicated that layers of 2:1 type LAs preferentially extend in the a–b plane at the initial transformation stage and stack along the c-axis with the transformation proceeding. Additionally, some small primary nanoparticles of 2:1 type LAs occasionally attached to each other along the c-axis or in the a–b plane. This revealed that 2:1 type LAs that formed at the interfaces between precursor boehmite and additional amorphous Si mainly grew through the layer growth mechanism occasionally accompanied by the oriented attachment.
研究领域:
地质学
·
矿物学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Xiaohe Wang,Hongwei Chen,Maosheng Zhang,Chaoran Wang,Yufei Wang,Pu Bai,Libo Li,Wenfu Yan
Silicoaluminophosphate (SAPO) zeolites as one of the most important members of zeolitic materials, providing equally high adsorption capacity of CO 2 as aluminosilicate zeolites, can be used as promising candidate materials for selective adsorption and separation of CO 2 . In this work, desirable from both economic and environmental viewpoints, a green and cost-effective one step synthesis strategy of K-SAPO-34 zeolite was developed in a wholly inorganic system under hydrothermal conditions. The pure K-SAPO-34 crystals can be obtained in a wide range of initial gel compositions. The as-synthesized K-SAPO-34 has high proportion of framework Si (Si / (Si + Al + P) = 0.37) and framework charge density ((Al – P) / (Si + Al + P) = 0.36). Because the presence of silica islands in K-SAPO-34 framework leads to a decrease in the number of extra framework cations per unit cell, the K-SAPO-34 in this work has a high CO 2 adsorption capacity (64.1 cm 3 /g) than the conventional K-SAPO-34 prepared by ion-exchange (1.9 cm 3 /g). Moreover, the K-SAPO-34 in this work has a superior separation performance for CO 2 /N 2 and CO 2 /CH 4 .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2015
·
IF 3.893
Zhiyuan Song,Dezhang Ren,Tian Wang,Fangming Jin,Qianhui Jiang,Zhibao Huo
An efficient conversion of biomass-derived cyclohexanone to cyclohexanol by in situ-formed hydrogen over Cu catalyst under hydrothermal conditions was reported at first. Among the catalysts tested, Cu exhibited high catalytic activity for the conversion of cyclohexanone, and the highest yield of 100% was obtained when Zn acted as reductant. The experiment was carried out by using gaseous hydrogen as the external hydrogen source indicated that the yield of 75.1% was lower than in situ-formed hydrogen by oxidation of Zn in water. The present study provides an efficient route by environmentally benign, commercially available Cu powder as a catalyst for cyclohexanone conversion to cyclohexanol.
研究领域:
化学工程
·
可再生资源利用
·
催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Yu Xie,Yeping Wu,Xiuli Zhao,Hanbing Ma,Ping Zhang,Yinyu Zhang
As the non-covalent interfacial interactions of adhesive-metal bonds are inherently susceptible to disruption by water molecules, bonding structures often culminate in failure under hydrothermal conditions. Herein, we designed a novel primer composed of catechol-based epoxy adhesive containing the aniline trimer, which enhances both the adhesion properties and anti-corrosive performance for ordinary epoxy adhesive. The lap shear strength of Q235 steel coated with EP-AT-CMB increased from 8.36 MPa to 22.07 MPa compared to untreated substrates. Notably, the adhesion strength of Q235 steel coated with EP-AT-CMB remained robust at 14.16 MPa after being immersed in water for 4 days, whereas the untreated samples experienced a near-total loss of adhesion strength. The superior anti-corrosion capability of EP-AT-CMB specimens is attributed to two factors: (1) the high density of hydrogen bonds of the primer/metal interface exhibit a barrier property for water molecules; (2) the electroactivity aniline trimer, which facilitates the formation of a passive film composed of Fe 2 O 3 and Fe 3 O 4 . The synergism between the catechol structure of the primer and the electrochemical behavior of the aniline trimer enhances the durability of the adhesive structure, offering a practical and durable primer material for a wide range of applications
研究领域:
材料科学
·
腐蚀与防护
·
界面化学
✓ 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）