JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2022
·
IF 6.437
Linlin Yi,Hong Yao,Xian Li,Zhenzhong Hu,Liu Shi,Yangwei Wu
The catalytic pyrolysis is a promising method for obtaining value-added aromatics, especially benzene, toluene and xylene (BTX). For different biomass-based materials, the dual catalyst system composed of CaO-based and ZSM-5-based catalysts showed an obvious selectivity for the BTX production. This study chose CaO derived from organic calcium precursors (Org-CaO) and nano-sized ZSM-5 (NZSM-5), and comprehensively investigated the effects mechanism of biomass components on the formation pathways of BTX via Py-GC/MS. Under the catalysis of NZSM-5, the BTX yields were only 7.8–30%. The BTX yields on Org-CaO/NZSM-5 were as follows: lipid (63.1%) > hemicellulose (55.4%) > cellulose (40.2%) > lignin (21.7%). Typical pyrolysis intermediates were employed to quantitatively reveal the intermediate reactions. Pyrolysis intermediates exhibited low BTX-forming reactivity over NZSM-5. The pre-catalysis of Org-CaO selectively converted part undesired intermediates (fatty acids and furans) into BTX precursors (short-chain olefins and ketones), facilitating the remarkable increase of BTX yield in the subsequent NZSM-5 catalysis process. However, the pre-catalysis of Org-CaO can hardly make the ring opening reaction of lignin-derived phenolic compounds that have very low reactivity on NZSM-5, and thence high-lignin biomass obtained low BTX production during catalytic pyrolysis by Org-CaO/NZSM-5. These findings afforded a new route for increasing the BTX yields by directionally forming BTX precursors or controlling biomass components.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Linhui Feng,Heping Cui,Pusen Chen,Khizar Hayat,Xiaoming Zhang,Chi-Tang Ho
An Amadori rearrangement product (ARP) derived from ribose (Rib) and glutathione (GSH) was prepared and identified as N-(1-deoxy-d-ribulos-1-yl)-glutathione by ultraperformance liquid chromatography–tandem mass spectrometry and NMR. Thermal treatment of the ARP aqueous solution was conducted, and a relatively high temperature was found to accelerate the degradation of the ARP. The concentration of furans formed at 120 °C was more than 6.39 times that at 100 °C, and especially, the high temperature favored the formation of furfural and 4-hydroxy-5-methyl-3(2H)-furanone through deoxyosone dehydration. The promoting role of extra-added GSH or its constituent amino acids was investigated in the volatile formation during thermal processing of the ARP. Both, the added GSH and its constituent amino acids, could timely capture glyoxal (GO) and methylglyoxal (MGO) to facilitate Strecker degradation, which improved pyrazine formation. Compared with glycine and glutamic acid, cysteine was the most effective extra-added amino acid to react with GO and MGO to produce pyrazine and methylpyrazine. More importantly, the cysteine degraded from extra-added GSH effectively accelerated the generation of sulfur-containing volatile compounds through the reaction of cysteine degradation products with furans and shorter-chain α-dicarbonyl compounds.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Weizhong Mao,Junhua Liu,Bingqian Yin,Deyu Kong,Shiwen Miao,Fang Wang
We propose a simple preparation route that converting biomass-derived furfural (FUR) to furfuryl alcohol (FOL) over a series of Ni-Mg-Al catalysts (NMA-n) with different molar ratios. Yield of FOL can reach 96.8 % over NMA-2 catalyst under the mild reaction conditions. There are three reasons for this high yield of FOL: (1) The introduction of different amounts of Mg and Al causes the synergistic effect to adjust the acidity and basicity of catalyst, optimal acid-base ratio (0.73:1) and Ni metal site achieve multi-centers collaborative catalysis. (2) Mesoporous structure of this catalyst provides a large number of adsorption sites. Furthermore, the highest O defect /O lattice ratio (1.79:1) create more oxygen vacancies, and then increase the adsorption sites of reactants, thereby making the catalytic activity of NMA-2 higher than most reported Ni-based catalysts. (3) Through kinetic studies, this excellent catalytic performance is related to activation energy (51.8 kJ/mol), which is lower than most reported CTH catalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 6
·1-11
·
IF 3.097
Wang Wei-Yu,Zha Xiang-Jun,Bao Rui-Ying,Ke Kai,Liu Zheng-Ying,Yang Ming-Bo,Yang Wei
Dynamics of exchange within vitrimer networks are influenced by mobility of the chemical species involved in the exchange reaction, then it can be affected by the crystalline phase when boronic ester bond is introduced into the thermoplastic elastomers with crystalline phase as physical cross-links. In this work, the dynamic dioxaborolane cross-links were introduced into commercial poly(ethylene-α-octene) (POE) with crystalline phases as physical cross-links to prepare POE vitrimers. The results of stress relaxation show that relaxation time (τ) follows an Arrhenius law with the temperature at the melting range for not only POE vitrimers and thermally treated POE vitrimers with dynamic cross-links, but also neat POE with purely physical cross-links. The liquid-to-solid transition temperature can raise to 35.3 °C for POE vitrimers from -42.9 °C of the thermally treated one, due to the constrained mobility by residual crystalline phases. The resulted POE vitrimers maintain a stress at break of higher than 27.5 MPa and an elongation at break of higher than 800% at room temperature. With the temperature increasing, the crystal melting induced weakening of the physical cross-linking in POE decreases the strength, but the storage modulus and the stress at 300% and 500% elongation of POE vitrimers are improved. The properties of POE vitrimers can almost keep unchanged after recycling or healing. All these results show that the introduction of reversible boronic ester bonds is a promising strategy to improve the performances and recyclability of physically cross-linked POE materials.
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Yang You,Min Zhi Rong,Ming Qiu Zhang
The present work proposes a novel strategy to prepare reversibly interlocked networks with enhanced mechanical properties through hierarchy-induced multilevel energy consumption mechanisms. The core issue lies in the introduction of in situ inter-macromolecular ionic interactions among the component networks regardless of their miscibility, which is hard to be implemented in other materials. Traditional small-molecule contra-ions are no longer necessary accordingly. As revealed by the proof-of-concept transparent interlocked networks composed of immiscible cross-linked styrene–butadiene rubber (SBR) and polyethylenimine (PEI), the interlocking architecture and the inter-macromolecular ionic interactions are mutually promoted. The latter pulls the immiscible polymer chains together, favoring the formation of the former, while the former prevents the neighboring chains from separation and helps the complexation among the counterpart functional groups. Eventually, multilevel energy consumption mechanisms can be triggered under the applied force and the conventionally conflicting properties including strength, toughness, and creep resistance of the interlocked networks are remarkably increased at the same time. Moreover, the moisture sensitivity that used to accompany ionic interactions disappears, which broadens the application scope of the materials in practice. Owing to the included reversible Diels–Alder bonds and Schiff base, the SBR and PEI-based interlocked networks are self-healable and reprocessable and can even be unlocked producing the original single networks. It is anticipated that a versatile and facile platform technique may thus be developed for creating new polymeric materials with advanced multifunctionality.
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 11
·1679
·
IF 4.329
Yanning Zeng,Weiming Yang,Shuxin Liu,Xiahui Shi,Aoqian Xi,Faai Zhang
Thermoset polymers show favorable material properties, while bringing about environmental pollution due to non-reprocessing and unrecyclable. Diels–Alder (DA) chemistry or reversible exchange boronic ester bonds have been employed to fabricate recycled polymers with covalent adaptable networks (CANs). Herein, a novel type of CANs with multiple dynamic linkers (DA chemistry and boronic ester bonds) was firstly constructed based on a linear copolymer of styrene and furfuryl methacrylate and boronic ester crosslinker. Thermoplastic polyurethane is introduced into the CANs to give a semi Interpenetrating Polymer Networks (semi IPNs) to enhance the properties of the CANs. We describe the synthesis and dynamic properties of semi IPNs. Because of the DA reaction and transesterification of boronic ester bonds, the topologies of semi IPNs can be altered, contributing to the reprocessing, self-healing, welding, and shape memory behaviors of the produced polymer. Through a microinjection technique, the cut samples of the semi IPNs can be reshaped and mechanical properties of the recycled samples can be well-restored after being remolded at 190 °C for 5 min.Keywords:CANs;semi IPNs;self-healing
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Science and Human Wellness
·
2021
·
IF 5.154
He Li,Xiangyi Tang,Chunjian Wu,Shujuan Yu
The stewed pork balls with brown sauce (SPB-BS) in China is well known for its delicacy and preferred by consumers. Maillard reaction (MR) is widespread in SPB-BS due to the use of sugar, meat and sauce in the thermal process. However, there is a lack of research on its risk and flavor by MR. By solid phase extraction combined with HPLC-MS, 4 kinds of harmful compounds including acrylamide (AA), heterocyclic aromatic amines (HAAs), 4-methylimidazole (4-MEI) and furan were analyzed in SPB-BS and their amounts ranged 0.05–0.50 mg/kg. The quantitative formula was proposed to evaluate the risk value of the SPB-BS, after taking into account the content, acceptable daily intake (ADI) and carcinogenicity of each compound. The risk values were in range of 0.57–37.93, suggesting that the risk caused by MR in SPB-BS was low. By head space-solid phase microextraction combined with GC-MS, 57 volatile compounds in SPB-BS were identified with the dominant contribution of alcohols, aldehydes, acids and esters. Based on the structures of these compounds and the composition of SPB-BS, lipid oxidation and MR are inferred to be responsible for the formation of the harmful and volatile compounds. In addition, the added sauces and oil provides the main precursors to form the harmful and volatile compounds in SPB-BS, so it is necessary to point out a balance between them in the further study.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Changhong Lin,Huan Ge,Tianle Wang,Min Huang,Puyou Ying,Ping Zhang,Jianbo Wu,Shibin Ren,Vladimir Levchenko
The realization of recyclable materials is an urgent problem to be solved for extending practical applications in industry. Herein, a simple method was proposed to prepared the recyclable materials thorough dynamic reversible chemistry . In this work, we design the recyclable and self-healing polyurethane based on the thermoreversible dynamic Diels-Alder reaction. In addition, the Halloysite nanotubes (HNTs) were introduced into the system to improve the thermal properties, mechanical properties of polyurethane nanocomposites (PUDM/HNTs). The tensile tests showed that the HNTs can significantly improved the mechanical properties of nanocomposites. The healing efficiency above 90% on average was achieved which was determined by the recovery of breaking strength . Besides, the composites exhibited outstanding reprocessability via thermally induced. Therefore, Such excellent recyclable performance and self-healing ability give the polyurethane materials an opportunity to have great potential in the fields of save-energy, friendly-environment materials.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2020
·Vol. 246
·期 10
·2065-2077
·
IF 2.366
Batool Zahra,Li Lin,Xu Dan,Wu Ming,Weng Longmei,Jiao Wenjuan,Cheng Hao,Roobab Umme,Zhang Xia,Li Xiaoxi,Liang Yi,Li Bing
Furan, which has been identified as possibly carcinogenic for humans, can be induced to different food items by thermal treatment. In accordance with the previous studies and risks associated with prevalence of furan in food, it is necessary to be acknowledged of amounts of furan formed in different thermally processed foods for human awareness. In this study, Headspace Solid-Phase Microextraction Gas Chromatography–Mass Spectrometry (HS-SPME-GC/MS) was optimized for simultaneous determination of furan, furfural, 2-methylfuran and 2-pentylfuran for the first time from different dried fruits and roasted nuts. The method was proved to be valid for determination of all analytes at 50 °C for 25 min, stirring at 700 rpm and 20% NaCl (W/V) using 50/30 μm divinlybenzene/carboxen/polysimethylsiloxane (DVB/CAR/PDMS) fibre. All analytes were baseline-separated at HP 5-MS column in less than 13 min and obtained results have shown prevalence of furan, furfural and 2-pentylfuran in the studied matrices; however, 2-pentylfuran was more prevalent in the roasted nuts than dried fruits and 2-methylfuran has not shown considerable prevalence in both matrices. Moreover, this method was validated in terms of linearity, precision, recovery, specificity, limit of detection and limit of quantification depending on analytes and sample matrices. Hence, the present method was proved to be highly sensitive, specific and robust with good precision and accuracy and suitable for monitoring these furan derivatives in the studied matrices.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 22
·期 3
·850-859
·
IF 9.48
Yang Qian,Ze-Jun Li,Xian-Long Du,Qi Zhang,Yi Zhao,Yong-Mei Liu,Yong Cao
Development of a highly efficient and robust catalyst with reduced usage of noble metals is extremely desirable for selective hydrogenations of furan-containing bio-based feedstocks, which represents an attractive and sustainable alternative to petrochemical resources. Herein, we describe a new type of well-dispersed Ru subnanoclusters (ca. 0.50 wt%) supported on commercial P25 TiO2 material obtained from a facile and effective amino acid-assisted deposition–precipitation strategy. The as-synthesized catalyst exhibits superior catalytic activity and selectivity for direct hydrogenation of industrially important furfural as well as a range of structurally diverse bio-based furanic compounds to their corresponding fully hydrogenated derivatives. An average turnover frequency (ATOF) value as high as 367 h−1 at 80 °C and 4 MPa H2 is obtained, which is the highest reported value. This catalyst also shows stable furfural total hydrogenation in 5 reaction cycles conducted at 80 °C (52 mmol-scale, turnover number up to 12 500). In terms of the kinetic and structural characterizations, the key performances of the ultrasmall Ru clusters are proposed to mainly originate from an enhanced number of unsaturated surface Ru atoms and change in local coordination environment. Our work highlights the importance of the subnanometric size of Ru clusters in the advancement of efficient and affordable approaches towards bio-based chemical production.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today
·
2019
·
IF 24.372
Yang You,Wei Li Peng,Pu Xie,Min Zhi Rong,Ming Qiu Zhang,Dong Liu
The combination of polymers can produce a multicomponent polymeric system, with advanced performance that cannot be achieved by the individual components. An ideal case lies in the creation of all interface materials to maximize the synergistic hybrid effects. Thus far, however, even for the elaborate interpenetrating polymer networks , microheterogeneity is inevitably observed. Herein, we show a conceptual innovative approach to prepare molecular-level interlocking polymer networks by topological reorganization of two immiscible single polymer networks with orthogonal reversible covalent crosslinkages. The conventional phase separation is suppressed as gelation proceeds, and the interlocked networks are further unlocked to a homogenous structure, recovering the original single polymer networks. The resultant interlocking polymer networks show nonlinear improvement in mechanical performance in addition to smart adaptivity like self-healability. An extensible platform technology for bringing in new materials may thus be developed, which is breakthrough in the scope of classic polymer engineering dominated by irreversible covalent chemistry . Furthermore, the long-range interlocked networks themselves are a promising model system for studying soft condensed matter physics .
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Changhong Lin,Dekun Sheng,Xiangdong Liu,Shaobin Xu,Fance Ji,Li Dong,Yan Zhou,Yuming Yang
Graphene and modified Graphene often can be used as effective reinforcer or cross-linker in self-healing materials. However, the influence of fillers sheets size on the self-healing materials remained unclear. In this report, we investigate the effect of different graphene oxide (GO) sheets size in the properties of self-healing Polyurethane . The different sizes of graphene oxide (GO) were prepared from various sizes of graphite via the improved Hummers' method. Furthermore, the corresponding maleimide functionalized GO (mGO) sheets were synthesized from maleimide modification processing. The X-Ray photoelectron spectroscopy (XPS) analysis shows that the smaller size GO, the higher oxidation and functionalization. We systematically investigated the influence of size GO and mGO on the mechanical and self-healing performance of Polyurethane/Graphene Oxide (PG) and Polyurethane/maleimide modified Graphene Oxide (PM) with the dynamic thermal reversible Diels-Alder bonds. The results show that GO sheets in smaller size produce an advantage on the mechanical and self-healing behavior. Moreover, the PM nanocomposites exhibited superior mechanical and self-healing properties compared to PG nanocomposites at the same loading.
✓ 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）