CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Jia Liu,Yinjiao Liu,Chengxizi Zhang,Jiawen Zhang,Lungang Chen,Shanjian Liu
Addressing the problem of difficulty in achieving highly selective production of nitrogenous compounds in traditional one-step nitrogen-rich pyrolysis due to the complex composition of biomass, the paper developed a synergistic strategy combining molecular sieve catalysis with staged nitrogen-rich pyrolysis. This strategy aims to achieve the directed conversion of cellulose-lignin into specific nitrogenous compounds and their selective enrichment in specific temperature zones. A systematic investigation was conducted on the catalytic effects of microporous (SSZ-13, HZSM-5) and mesoporous (SBA-15, MCM-41) molecular sieves. The results revealed that mesoporous catalysts exhibited excellent enrichment capabilities, owing to their greater pore size and specific surface area. Among these, MCM-41 enabled the proportion of nitrogenous components to reach as high as 83.0%–94.0% at different temperature stages. More importantly, this temperature-staged nitrogen-rich catalytic pyrolysis strategy realized the temperature-dependent enrichment of various nitrogenous products. Pyrroles (59.0%) and pyrazines (73.5%) were primarily enriched between 250–300 °C. Anilines (76.0%) and azoles (56.5%) were produced in the 300–400 °C range, while pyridines (91.4%) and indoles (∼100%) were selectively formed at 400–600 °C. The EPR analysis revealed the formation of additional oxygen vacancies in MCM-41 post-reaction. The overlap of N and O elemental distributions in EDS mapping suggested a potential interaction between NH 3 and the active sites. Reaction pathway analysis further demonstrated that the cooperative role of catalyst pore structure and acidic sites was vital for product selectivity. This research elucidates the structure–activity relationship of product distribution and catalyst, providing theoretical and technical support for the effective targeted synthesis of biomass-derived nitrogenous chemicals.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Chonglin Zheng,Weifeng Zhang,Zijing Guo,Yujie Jin,Jinying Li,Shengxu Luo,Jihui Li
Pyrolysis impregnation of magnetic iron is a promising strategy for preparation of magnetic biochar, but high temperature is usually required to produce magnetic iron species. Herein, a novel co-oxidative pyrolysis using potassium permanganate and potassium ferrate was explored for synthesis of magnetic biochar at 250–400 °C. Additionally, the magnetic biochar was applied to remove tetracycline and copper(II) from aqueous solution. This co-oxidative pyrolysis successfully impregnated magnetite, zero-valent iron, and manganese ferrite into carbon matrix with manganese oxides at 250 °C. Meanwhile, porous structures were created, accompanying by abundant oxygen groups. This magnetic biochar displayed 720.7 and 267.9 mg/g adsorption capacities toward tetracycline and copper(II) at 35 °C correspondingly, with 21.79 emu/g saturation magnetization. High adsorption capability was still achieved in real water matrices, showing great potential of the magnetic biochar for wastewater treatment in industry. The adsorption could be primarily contributed to hydrogen bond/complexation/π-π interaction/pore filling for tetracycline and cation exchange/complexation/electrostatic interaction/pore filling for copper(II). The success in fabrication of highly adsorptive magnetic biochar by potassium permanganate and potassium ferrate co-oxidative pyrolysis at low temperature, demonstrating oxidative magnetization was a promising technology for synthesis of high performance magnetic biochar with low energy consumption.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Yu Zhang,Xiaoqiao Zhang,Ping Zhu,Weidong Li,Lingen Zhang
To overcome the drawbacks of current recycling technologies and achieve clean utilization of toxic substances in spent lithium-ion batteries, a lithium synergistic vacuum catalytic co-pyrolysis method was proposed to defluorinate electrolyte and polyvinylidene fluoride with directional conversion to light fuel. The gas chromatography–mass spectrometry results indicated, compared to the control group, that adding CaO-ZSM-5 catalyst increased the light fuel (alcohols and hydrocarbons) content of the pyrolysis gas from 61.8 % to 91.47 % under the optimal conditions (530 °C and initial pressure of 100 Pa), whereas the total proportion of esters and toxic organic compounds decreased from 32.58 % to 3.99 %. Moreover, the ethylene carbonate and hexanedinitrile content of the electrolyte was enriched to 85 % in the pyrolysis oil. Notably, fluoride was not detected in the pyrolysis oil and gas, achieving a 98.16 % defluorination rate, implying that hazardous waste was transformed to ordinary waste, thereby greatly avoiding toxic emissions to the environment. The X-ray diffraction (XRD) and scanning electron microscopy/energy-dispersive X-ray spectroscopy data indicated that fluorine was fixed in the form of CaF 2 . X-ray photoelectron spectroscopy and XRD analysis of the catalytic pyrolysis residue confirmed that nonferrous metals in the cathode material were converted into simple substances and oxides. Finally, possible co-pyrolysis mechanisms of the organic compounds are proposed, including Li + generation, chain initiation, catalytic pyrolysis, and directional conversion.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Yuan Zhang,Yongshuai Wang,Hongyou Cui,Fang Wang,Zhihe Li,Changhua Sun,Yun Jia,Yujiao Xie,Feng Song,Jiangang Wang,Weiming Yi
Co-pyrolysis of biomass with Red Mud was used to boost up the quality of the produced bio-oil and recover iron from Red Mud. The influences of five different biomass species and impregnation pretreatment were investigated. It was found that co-pyrolysis could significantly improve the bio-oil quality, decreasing the acidity from 173.28 to 1.18 mg KOH/g due to the decarboxylation of carboxylic acids into ketones under the catalysis of Red Mud and boosting up the HHV from 20.05 to 31.80 MJ/kg with an energy efficiency of 72.56%. Meanwhile, the soluble alkalinity of Red Mud declined from 65.34 to 5.26 mg HCl/g, which is very crucial to mitigate the harmfulness and perniciousness to the environment. The characterizations of XRD, 57 Fe Mössbauer spectroscopy and XPS confirmed that the weak magnetic Fe 2 O 3 and FeOOH in Red Mud could be completely transformed into stronger magnetic Fe 3 O 4 . For this reason, the magnetic separation iron recovery reached up to 92.25% with iron grade of 66.12%. The findings in the research not only open the avenue for efficient biomass conversion to high quality fuels, but also provide an efficient approach to resourceful utilization of Red Mud.
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2022
·
IF 8.857
Zhanshi Ni,Haobo Bi,Chunlong Jiang,Hao Sun,Wenliang Zhou,Zhicong Qiu,Liqun He,Qizhao Lin
Confronted with the shortage of fossil energy, the large inventory and the serious pollution of industrial solid waste, the development of clean and efficient industrial solid waste disposal methods have become a trend. In this study, Thermogravimetric-Fourier transform infrared spectrometry was utilized to carry out the co-pyrolysis experiment of coal slime and lignin. Pyrolysis experiments were carried out following 7 different mass mixing ratios. The initial pyrolysis temperatures of CS, S9G1, S7G3, S5G5, S3G7, S1G9, and LIG were 414.5, 373.3, 287.6, 233.3, 225.8, 218.6, and 209.6 °C, respectively. By observing the evolution of the gaseous products of the sample pyrolysis, the results showed that the gaseous products mainly include hydrocarbons, aldehydes, ethers, and alcohols. The ratio of lignin in the mixture was changed, and the interaction between the sample particles was different. The principal component analysis method provided helps to understand the mechanism of co-pyrolysis of coal slime and lignin. The relative error of the established artificial neural network prediction was less than 2.5%. This paper comprehensively analyzed the interaction and gas evolution law during the co-pyrolysis of coal slime and lignin.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Zengtong Deng,Syed Shatir A. Syed-Hassan,Yuanjing Chen,Long Jiang,Jun Xu,Song Hu,Sheng Su,Yi Wang,Jun Xiang
Bio-oil can be converted to chemicals, carbon material, or syngas by various thermochemical processes which are always preceded with the pyrolysis step. In bio-oil pyrolysis, coke formation is almost inevitable, causing difficulties for further processing. In this study, bio-oil was mixed with Ni/Al 2 O 3 before it was fed for pyrolysis. Interesting results were observed whereby the effect of Ni/Al 2 O 3 mixing on coke formation shifted from promoting to inhibiting with increasing pyrolysis temperature. When the temperature was higher than 700 °C, contrary to the cases without mixing, the apparent decreases in coke yield were observed (e.g., the coke yield decreased by 10% at 800 °C). Comparative studies on bio-oil and its lignin-derived oligomer fraction indicated that the catalytic cracking of small molecules could enhance the formation of hydrogen radicals, which promoted thermal decomposition of lignin-derived oligomers, thus inhibiting coke formation via polymerization.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yanzhuo Zhang,Mengqi Xu,Rui He,Jing Zhao,Wei Kang,Jinghua Lv
Because of the increasingly widespread contamination of antibiotics, the preparation of biochar by heteroatom doping to further improve the catalytic degradation efficiency of antibiotics has become a major focus of research. In this study, N-doped (NBC), S-doped (SBC), and NS-doped (NSBC) moso bamboo biochar were obtained at preparation temperatures of 300–700 °C. The concentration of environmentally persistent free radicals (EPFRs) in all biochars peaked when the preparation temperature was 500 °C: 2.45 × 10 19 spins·g −1 (BC), 9.23 × 10 19 spins·g −1 (NBC), 6.10 × 10 19 spins·g −1 (SBC), and 4.36 × 10 19 spins·g −1 (NSBC). After heteroatom doping, EPFR species were more abundant, and the distribution of three types of EPFRs (oxygen-centered (g > 2.0040), carbon-centered (g < 2.0030), and carbon-centered radicals with oxygen atom free radicals (2.0030 < g < 2.0040) varied with the preparation temperature. In the process of antibiotic degradation, both NBC and SBC increased the degradation rate of antibiotics, whereas NSBC reduced the degradation rate. Compared with the degradation rate of antibiotics of biochar (79.86%), the degradation rate of antibiotics by NBC, SBC, and NSBC via PMS activation was 92.23%, 88.86%, and 70.97% on average in 30 min, respectively. The greatest contributors to the catalytic degradation were SO 4 •- , followed by 1 O 2 , •OH, and O 2 •- . EPFRs and 1 O 2 might be the main contributors to the free radical and non-free radical pathways. The enhancement of EPFRs following the N doping or S doping of biochar is the key factor underlying PMS activation. Therefore, changes in the structure of biochar can better activate PMS to produce reactive oxygen species-degrading antibiotics. The mineralization rate of antibiotics by BC, NBC, SBC, and NSBC was 42.12%, 47.06%, 44.99%, and 39.01%, respectively. This means that a small portion of the antibiotics was completely decomposed into CO 2 , H 2 O, and inorganic substances after degradation. Cyclic experiments showed that heteroatom-doped biochar had higher reusability, and the degradation rate decreased less than 15%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WASTE MANAGEMENT
·
2021
·
IF 7.145
Junhao Lin,Shichang Sun,Juan Luo,Chongwei Cui,Rui Ma,Lin Fang,Xiangli Liu
This paper proposed to use ferric oxide (Fe 2 O 3 ) and ferroferric oxide (Fe 3 O 4 ) as catalysts with both microwave absorption and catalytic properties. Carbon dioxide (CO 2 ) was introduced as the reaction atmosphere to further improve the quality of biofuel produced by microwave pyrolysis of food waste (FW). The results showed the bio-gas yield and the syngas concentration (H 2 + CO) increased to 70.34 wt% and 61.50 mol%, respectively, using Fe 3 O 4 as the catalyst. The content of aliphatic hydrocarbons in bio-oil produced with the catalyst Fe 2 O 3 increased to 67.48% and the heating value reached 30.45 MJ/kg. Compared with Fe 2 O 3 catalyst, Fe 3 O 4 exhibited better microwave absorption properties and catalytic properties. Transmission electron microscopy (TEM) and Electron paramagnetic resonance (EPR) characterizations confirmed that the crystal surface of Fe 3 O 4 formed more oxygen vacancy defects and unpaired electrons. Additionally, according to the X-ray photoelectron spectroscopy (XPS) analysis, the content of lattice oxygen in Fe 3 O 4 was 14.11%, a value that was much lower than Fe 2 O 3 (38.54%). The oxygen vacancy defects not only improved the efficient utilization of microwave energy but also provided the reactive sites for the reaction between the volatile organic compounds (VOCs) and CO 2 to generate CO. This paper provides a new perspective for selecting catalysts that have both microwave absorption and catalytic properties during the microwave pyrolysis of biomass.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2020
·
IF 2.87
Yu Shi,Chang Liu,Jiankun Zhuo,Qiang Yao
Catalytic fast co-pyrolysis of biomass and plastic is an effective method to achieve high-quality bio-oil production. In this work, (Ni)-MCM-41 catalysts with different Ni loadings were prepared and characterized in detail by using a variety of advanced analytical techniques, and the effects on the catalytic performance were analyzed by micropyrolysis with gas chromatography mass spectrometry (Py-GC/MS) and thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR) methods. The results showed that an appropriate amount of Ni addition can effectively modulate the physicochemical properties of MCM-41. For a Ni loading of 25.1 wt % (Cat-C), the catalyst showed an optimal catalytic performance, a decrease in the proportion of oxygenated compounds in the product from 35.6 (MCM-41) to 13.4%, and an increase in the relative total amount of olefins plus aromatics from 62.2 (MCM-41) to 84.6%. The excellent catalytic performance of Cat-C can be ascribed to a balancing of its proper physical structural properties, appropriate acidity, strong metal–carrier interaction, high metal dispersion, and excellent compatibility balance between active and acidic sites.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Yong Huang,Shasha Liu,Jie Zhang,Syed Shatir A. Syed-Hassan,Xun Hu,Hongqi Sun,Xun Zhu,Jianbin Zhou,Shu Zhang,Hong Zhang
This study investigated the interactions between volatile and char during biomass pyrolysis at 400 °C, employing a β–5 lignin dimer and amino-modified graphitized carbon nanotube (CNT–NH 2 ) as their models, respectively. The results demonstrated that both –NH 2 and its carrier (CNT) facilitated the conversion of the β–5 dimer, which significantly increased from 9.7% (blank run), to 61.6% (with CNT), and to 96.6% (with CNT–NH 2 ). CNT mainly favored the breakage of C–O bond in the feedstock to produce dimers with a yield of 55.5%, while CNT–NH 2 promoted the cleavage of both C–O and C–C bonds to yield monomers with a yield up to 63.4%. Such significant changes in the pyrolysis behaviors of the β–5 lignin dimer after the introduction of CNT–NH 2 were considered to be mainly caused by hydrogen-bond formations between –NH 2 and the dimeric feedstock/products, in addition to the π–π stacking between CNT and aromatic rings.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Zhenxiao Tang,Maozhong Yi,Qiuling Xiang,Yuhui Du,Ke Peng
An improved high-solid-loading slurry impregnation process was developed to introduce HfB 2 particles into a low-density C/C preform efficiently, and precursor infiltration and pyrolysis process was used for densification to obtain a C/C-HfB 2 -SiC composite. The microstructure characterization revealed that HfB 2 particles uniformly filled the pores in the C/C preform, and SiC well densified the interstices between HfB 2 particles and the small pores in the carbon fiber bundles. After being tested, the C/C-HfB 2 -SiC composite had a density of 4.07 g/cm 3 and a bending strength of 344.8 MPa, and exhibited a non-brittle fracture behavior. After ablation with oxyacetylene flame at 2500 ℃ for 120 s, the mass ablation rate and linear ablation rate of the C/C-HfB 2 -SiC composite were 0.5 mg/s and 0.415 μm/s, respectively. The good ablation performance is attributed to the hindering effect of the HfO 2 scale on oxygen diffusion at high temperature.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Fan Zhang,Haipeng Yu,Linghao Li,Hong Wang,Zhen He,Enchen Jiang,Yan Sun,Zhihe Li,Weiming Yi,Xiwei Xu
As a novel pretreatment method, a deepeutectic solvent (DES) can effectively deconstruct lignocellulose to promote its selective saccharification. In this research, biomass light oil (BL-oil) and choline chloride (ChCl) were employed to prepare a novel, low-cost imitative DES to boost pyrolytic saccharification of corn stalk (CS). The physical–chemical properties of original CS and pretreated samples were investigated. Furthermore, the influence of mass ratio of BL-oil and ChCl as well as pretreated temperature on pyrolytic product distribution was studied. The results showed that the imitative DES had a similar pretreated effect to commercial DESs, which can destroy the structure of CS to facilitate the degradation of hemicellulose and lignin. In addition, the imitative DES was more conducive to removal of alkali metals and alkaline earth metals. The yield of levoglucosan increased from 2.59 to 59.87 mg/g under the optimum imitative DES pretreated condition. The preparation and utilization of a biomass-derived imitative DES broadened the application of biomass pyrolysis oil and realized the “closed-loop” concept of biorefinery.
✓ 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）