Article
Engineering, Environmental
Abdenour Achour, Diana Bernin, Derek Creaser, Louise Olsson
Summary: The catalytic hydroconversion of Kraft and hydrolysis lignins was compared for the first time using an unsupported NiMoS-SBA catalyst in a batch reactor. The study investigated the effect of key reaction parameters on product yields and properties. The results showed that hydrolysis lignin had higher monomer yields compared to Kraft lignin due to its lower ash and sulfur contents, as well as chemical structural differences. The hydrolysis lignin also produced more small molecules from ring-opening of cellulose, which stabilized the reactive oligomeric groups. The NiMoS-SBA catalyst showed promise for the depolymerization of lignin and had good stability for multiple reaction cycles.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Bingyue Tang, Wenzhi Li, Xia Zhang, Baikai Zhang, Hao Zhang, Cunshuo Li
Summary: Via controlled oxidation, MoO3 with oxygen vacancies was synthesized and employed as a catalyst for the depolymerization of Kraft lignin in a new solvent system without external hydrogen gas. The optimized catalyst and hydrogen-donor solvent system resulted in high yield of soluble products and increased heating value of liquid fuels.
Article
Energy & Fuels
Xia Zhang, Wenzhi Li, Jindong Wang, Baikai Zhang, Ge Guo, Changcheng Shen, Yihang Jiang
Summary: A novel catalyst has been developed to effectively convert lignin into liquid fuels, by selectively adsorbing and activating C-O and C-C bonds, as well as stabilizing depolymerization intermediates. This approach achieves efficient lignin depolymerization, leading to increased yields and improved fuel quality.
Article
Chemistry, Physical
Joby Sebastian, You Wayne Cheah, Diana Bernin, Derek Creaser, Louise Olsson
Summary: In the deoxygenation process of kraft lignin to aromatics, the presence of impurities has a significant impact on the activity of the catalyst, with some impurities obstructing depolymerization and leading to catalyst deactivation. However, at lower loadings, impurities can also act as promoters, counteracting the negative effects during depolymerization.
Article
Engineering, Environmental
Mingqiang Chen, Zhiyuan Tang, Yishuang Wang, Jingjing Shi, Chang Li, Zhonglian Yang, Jun Wang
Summary: Phosphorus-modified Mo/Sepiolite catalysts can regulate Kraft lignin conversion, reducing lignin oil yield and HHV while significantly increasing the productivity of phenolic compounds. The optimized distribution between Mo5+ sites and acid strength/type in 5P-Mo/SEP results in lignin oil with a higher HHV compared to Kraft lignin.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Guang Miao, Peng Chong, Cuiting Yang, Zewei Liu, Hao Yu, Lei Dong, Guoqing Li, Jing Xiao
Summary: This study reports the catalytic upgrading of thiophenic sulfur compounds over a silver-modified MoO3 catalyst under ambient conditions. The conversion of thiophenic compounds to bromides using Br-2 and H2O2/HBr achieved high conversion rates and selectivity.
Article
Chemistry, Applied
Omar Y. Y. Abdelaziz, Ida Clemmensen, Sebastian Meier, Sasa Bjelic, Christian P. P. Hulteberg, Anders Riisager
Summary: Zirconia-supported vanadium-copper catalysts (VCux:yZr) were used to oxidatively depolymerize softwood LignoBoost Kraft lignin (LB). The most promising catalyst was VCu1:2Zr, which achieved a total monomer yield of 9 wt% and the highest selectivity for vanillin (59%). This study demonstrates the potential of the V-Cu/ZrO2 catalyst system in the production of value-added aromatics from technical lignin under relatively mild conditions, contributing to the more sustainable use of forest-based industries.
TOPICS IN CATALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Xuan-Tien Pham, Thong Le Minh Pham, Xuan Thang Cao, Khanh B. Vu, Vy Anh Tran, Gabriella Garbarino, Thanh Khoa Phung
Summary: Catalytic conversion of lignin into valuable liquid products using reduced Ru/C catalyst was investigated. The results showed that the catalyst is stable and active for the conversion of lignin model compound. For Kraft lignin, the catalyst enhanced the conversion, with the highest conversion achieved using ethanol solvent at high temperature.
Article
Chemistry, Multidisciplinary
Alireza Saraeian, Sadie J. Burkhow, Dapeng Jing, Emily A. Smith, Brent H. Shanks
Summary: The study showed that the acidity of the catalyst and the oligomerization of MoOx are crucial factors in determining product distribution. The addition of MoO3 reduces the number of strong Lewis acid sites and creates weaker Lewis and Brønsted acid sites, resulting in lower coke yields. The integration of MoOx species and acidity from the support allows for modulation of product selectivity.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Energy & Fuels
Mingqiang Chen, Wei Dai, Yishuang Wang, Zhiyuan Tang, Hong Li, Chang Li, Zhonglian Yang, Jun Wang
Summary: In this study, a series of Mn-Mo/SEP catalysts with different Mn/Mo ratios were prepared and applied to the catalytic depolymerization of lignin in supercritical ethanol systems. The results showed that the Mn/Mo ratios could regulate the catalyst performance and affect the yield and selectivity of the products. Among the catalysts tested, 3Mn1Mo/SEP exhibited excellent catalytic performance with high lignin yield and selectivity to phenols.
Article
Energy & Fuels
Yiya Wang, Riyi Lin, Liqiang Zhang, Xinlu Han, Jinyu Li, Chenxing Huang, Qiwei Dong, Pengyu Chen, Huanan Li, Xinwei Wang
Summary: This study investigates the catalytic viscosity reduction of heavy oil at low temperatures using a series of ZrO2-MoO3-based catalysts loaded on raw or modified lotus stem biochar. The results show that catalyst IV, consisting of KH570-MLSB, ZrO2, and MoO3, exhibits the best catalytic effect at 200 degrees C.
Article
Energy & Fuels
Mingqiang Chen, Hong Li, Yishuang Wang, Zhiyuan Tang, Wei Dai, Chang Li, Zhonglian Yang, Jun Wang
Summary: This study reports a catalytic process using microporous biochar (BC) derived from lignin supported Ni-Ce catalysts for the depolymerization of lignin to guaiacol and 4-alkyl guaiacols in an aqueous-phase glycerol medium. The catalytic system showed high yields of the target compounds due to the promotion of metallic Ni sites and the interaction of Ni with CeO2, which resulted in the formation of Ni-CeO2-x interfaces and oxygen vacancies that could adsorb and activate the bonds of lignin and its fragments.
Review
Chemistry, Multidisciplinary
Dimitris D. S. Argyropoulos, Claudia Crestini, Christian Dahlstrand, Erik Furusjo, Claudio Gioia, Kerstin Jedvert, Gunnar Henriksson, Christian Hulteberg, Martin Lawoko, Clara Pierrou, Joseph S. M. Samec, Elena Subbotina, Henrik Wallmo, Martin Wimby
Summary: Kraft lignin, a by-product of pulp production, can be separated from black liquor to reduce the load on recovery boilers and increase pulp production, while also generating valuable bioenergy. In recent years, there has been growing interest in developing and utilizing this underutilized resource. This review provides an overview of Kraft lignin, its applications, and evaluates its value chains from black liquor to different products. It is anticipated that this work will inspire further development and use of Kraft lignin for new applications, promoting global sustainability concerns.
Article
Chemistry, Multidisciplinary
Patricia Figueiredo, Maarit H. Lahtinen, Melissa B. Agustin, Danila Morais Carvalho, Sami-Pekka Hirvonen, Paavo A. Penttila, Kirsi S. Mikkonen
Summary: The study found that the acetone/water (3:1) method is the most effective approach for preparing uniform, small, and spherical LNPs from three different technical lignins. These LNPs show improved stability at different ionic strengths and pH ranges, making them suitable for various applications in pharmaceutical and food sciences.
Article
Chemistry, Physical
Xiaomeng Dou, Wenzhi Li, Chaofeng Zhu, Xiao Jiang
Summary: The depolymerization and demethoxylation of Kraft lignin (KL) was achieved using a novel H-NiFe2O4 catalyst under mild conditions, with high liquid product yield and minimal coke yield. The catalytic performance of H-NiFe2O4 benefits from the synergy of Ni and Fe, promoting lignin depolymerization while suppressing condensation reactions. Plausible reaction pathways of KL depolymerization over H-NiFe2O4 are discussed, demonstrating the potential of this catalytic system for efficient conversion of KL into liquid fuels.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Huawang Zhao, Xiaoyin Chen, Alexander J. Hill, Guohua Jing, Yongdan Li, Johannes W. Schwank
Summary: Pd/SSZ-13 catalysts were investigated for the simultaneous storage of NO and C3H6 at 100 degrees C. The effects of the state of Pd species on co-adsorption and release were studied under simulated exhaust conditions. The results showed that the NO storage capacity at 100 degrees C was enhanced by simultaneous NO + C3H6 adsorption. DRIFTs results showed that Pd2+ provides the adsorption sites for NO + C3H6 to form Pd2+(NO) (C3H6), which alleviates the inhibition effect of H2O on NO adsorption on Pd ions. The different release behaviors of NO + C3H6 are discussed based on the chemistry of NO and C3H6 adsorption and the effect of intermediate CO.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Qianyuan Qiu, Zheng-Ze Pan, Penghui Yao, Jiashu Yuan, Chun Xia, Yicheng Zhao, Yongdan Li
Summary: A bi-functional catalytic perovskite LaNi0.5Co0.5O3 (LNCO) is utilized as the cathode in a high-efficiency Li-O2 battery with a molten nitrate salt electrolyte at 160 degrees C. This LNCO cathode exhibits stable low charge-discharge overpotential and high energy efficiency over 100 cycles. The discharge product, Li2O, has a porous and fluffy morphology, facilitating the transfer of oxygen and other intermediate species. Li2O as a discharge product enables a higher theoretical specific energy density compared to Li2O2 in ambient temperature Li-O2 batteries.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Huanghao Ning, Wenxue Ji, Yongdan Li, Cuijuan Zhang
Summary: Thermal treatment can improve the catalytic activity of the 5 wt% BaMnO3-CeO2 composite catalyst for NO decomposition. The diffusion of Ce species from CeO2 to BaMnO3 lattice generates oxide ion vacancy, accelerating the rate-determining step and enhancing the catalytic activity.
Article
Chemistry, Physical
Jiashu Yuan, Xiaotang Shi, Qianyuan Qiu, Penghui Yao, Yonggao Xia, Yicheng Zhao, Yongdan Li
Summary: In this study, a flexible freestanding anionic metal-organic framework (MOF)-based membrane was successfully prepared through a solution casting method, which exhibited impressive ionic selectivity and conductivity. The membrane enabled high-capacity retention and accelerated uniform lithium deposition, leading to improved performance of the nonaqueous redox flow batteries (NARFBs).
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Running Kang, Zirui Zhang, Feng Bin, Xiaolin Wei, Yongdan Li, Guoxing Chen, Xin Tu
Summary: The effects of catalyst support on the CO catalytic ignition performance and reaction pathways were investigated, and it was found that TiO2 or ZSM-5 supports promote copper dispersion and the oxidation process mainly occurs at the phase interface. The Cu and Ce interactions lead to the formation of solid solutions, which enhance the activity of individual copper sites and favor the ignition of CO at low temperatures. The Cu2+ species are reduced to form dicarbonyls, which also take part in the oxidation process.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Yushuai Sang, Yuhan Ma, Gen Li, Kai Cui, Mingze Yang, Hong Chen, Yongdan Li
Summary: The dissolution and solvolysis processes of enzymatic hydrolysis lignin (EHL) in ethylene glycol were investigated. Ethylene glycol exhibited high EHL solubility and achieved complete EHL dissolution at room temperature. The interactions between ethylene glycol and EHL, such as van de Waals interactions, were found to break the pi-pi stacking in EHL, resulting in complete EHL dissolution. When NaOH and Ni were used as co-catalysts, EHL was efficiently depolymerized at 200 degrees C, and the overall monomer yield reached 18.8 wt%. Fourier transform infrared spectroscopy (FT-IR) and molecular dynamics simulation results showed that the adsorption of ethylene glycol over Ni surface hindered the adsorption of lignin fragments and monomers. Thus, EHL catalytic solvolysis in ethylene glycol occurred in the liquid phase, where OH- of NaOH promoted the EHL linkage breakage and active hydrogen atoms formed on Ni surface stabilized the active monomers.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Electrochemistry
Mengyuan Wang, Xiaosong Zhang, Ziyin Guo, Chunhua Chen, Jiashu Yuan, Yongdan Li, Yonggao Xia, Ya-Jun Cheng
Summary: In this paper, a two-step carbon coating process is developed to suppress irreversible phase transition and excessive side reactions at the electrode-electrolyte interface for high-nickel ternary cathode materials LiNi0.8Co0.1Mn0.1O2 (NCM811). Sucrose is melted and coated onto the particle surface, which is converted into carbon in situ at elevated temperature under oxygen atmosphere. The carbon coating treatment effectively improves the cyclic (96.7% capacity retention after 100 cycles at 1 C) and rate performance (130 mAh g(-1) at 5 C) of the NCM811 cathode.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Environmental
Ying Li, Dongdong Chen, Xin Xu, Xinyu Wang, Running Kang, Mingli Fu, Yanbing Guo, Peirong Chen, Yongdan Li, Daiqi Ye
Summary: This review summarizes recent advances in passive NOx adsorbers (PNA) based on palladium-exchanged zeolites for efficient reduction of harmful nitrogen oxides (NOx) emitted from low-temperature diesel exhausts during cold-start conditions. The review discusses the choice of parent zeolite, Pd precursor, and synthetic method for Pd-zeolite synthesis, as well as the effect of hydrothermal aging on Pd-zeolite properties and PNA performance. Mechanistic insights into Pd active sites, NOx storage/release chemistry, and interactions with exhaust components/poisons are gained through the integration of experimental and theoretical methodologies. Novel designs of PNA integration into exhaust after-treatment systems are also presented, along with discussions on major challenges and implications for further development and real-world application of Pd-zeolite-based PNA in cold-start NOx mitigation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Parminder Kaur, Moonis Ali Khan, Yongdan Li, Ahmed A. S. Al-Othman, Zeid Abdullah Alothman, Mika Sillanpaa, Ville Kuokkanen, Monzur A. Imteaz, Saleh Al-Farraj
Summary: The effectiveness of bifacial mixed metal-metal organic framework (MOF) anodes for municipal wastewater's photoelectro-catalytic (PEC) treatment is explored. The removal efficiency of pollutants from municipal wastewater and the impact of operational parameters are verified using TiO2-Bi(mixed metal)-MOF and TiO2-Sb(mixed metal)-MOF anodes in a visible light range. The study shows that TiO2-Bi(mixed metal)-MOF anodes in the PEC system play a positive role in removing micropollutants and disinfecting municipal wastewater, with high efficiency.
JOURNAL OF CLEANER PRODUCTION
(2023)
Review
Biochemistry & Molecular Biology
Huanghao Ning, Yongdan Li, Cuijuan Zhang
Summary: Reducing CO2 emissions and converting it into valuable chemicals is important, and integrating the capture and utilization processes is a feasible option to reduce transportation costs.
Article
Chemistry, Physical
Xuelan Hou, Hang Zhang, Ramesh Raju, Yongdan Li, Peter D. Lund
Summary: Improving light absorption and conversion ability is crucial for enhancing the performance of photoelectrochemical (PEC) cells in converting solar radiation into chemical energy. This study demonstrates a simple and low-cost method to prepare a nanostructured TiOx film with tunable absorption range from 250 to 2500 nm, surpassing the absorption edge of TiO2. The film shows superior light capture ability and a 10-fold increase in charge carrier transfer rate under AM 1.5 G light. It has potential for large-area PEC cells with promoted charge carriers' transfer.
JOURNAL OF POWER SOURCES
(2023)
Article
Electrochemistry
Bingxue Wu, Jian Zhang, Zhi Yang, Xuanlin Lu, Xin Zhao, Wen Liu, Jiaxuan Chen, Yicheng Zhao, Yongdan Li
Summary: In this study, a Ni-Ce0.8Sm0.2O2-δ anode with low Ni content is successfully synthesized through a polymer-directed evaporation-induced self-assembly strategy. The anode exhibits an enlarged triple-phase boundary region and improved reactivity of lattice oxygen due to the even distribution of Ni. With 5 wt.% Ni, the anode shows the lowest polarization resistance and the highest amounts of oxygen vacancies and Ce3+/Ce4+ redox pairs, resulting in improved charge transfer process and excellent stability.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Jinze Wu, Hui Liu, Yongdan Li, Cuijuan Zhang
Summary: Amorphous BiOx, prepared on the surface of NASICON electrolyte using the photochemical metal-organic deposition method, can greatly enhance the interfacial properties at the anode side. The Na symmetric cell operates at a critical current density of 1.2 mA cm(-2) and cycles steadily at 0.5 mA cm(-2) for 1000 h at 30 °C.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Najla Grioui, Amal Elleuch, Kamel Halouani, Yongdan Li
Summary: This study investigates the feasibility of using exhausted olive pomace biochar as a fuel in a direct carbon fuel cell. The results confirm the feasibility, with a maximum power density of 10 mW cm(-2) at 700 degrees C. The limited output of the fuel cell is attributed to the high ash content and low volatile matter content of the biochar.
C-JOURNAL OF CARBON RESEARCH
(2023)
Article
Chemistry, Physical
Qianyuan Qiu, Jiaqi Wang, Penghui Yao, Yongdan Li
Summary: In this study, a facile coprecipitation approach was used to synthesize a LaNi0.5Co0.5O3 perovskite oxide with a low annealing temperature, which was then utilized as the cathode material for a lithium-oxygen battery. The assembled battery exhibited superior electrochemical performance and stable operation.
FARADAY DISCUSSIONS
(2023)