Article
Chemistry, Physical
Tingyu Liang, Jialing Chen, Sen Wang, Pengfei Wang, Zhangfeng Qin, Fang Jin, Mei Dong, Jianguo Wang, Weibin Fan
Summary: This study investigates the effects of acid density on the methanol-to-hydrocarbon (MTH) performances and deactivation behaviors of H-MCM-22 zeolites. It is found that acid density has a significant impact on MTH performances, while acid distribution has a smaller effect. Increasing acid density promotes hydrogen transfer reactions and the formation of aromatics, ethene, and alkanes. Low acid density results in coke covering acid sites inside the micropores, while high acid density leads to massive coke deposition on the external surface. The deactivation behaviors of H-MCM-22 zeolites can be divided into three stages.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jingxiu Xie, Daniel S. Firth, Tomas Cordero-Lanzac, Alessia Airi, Chiara Negri, Sigurd Oien-Odegaard, Karl Petter Lillerud, Silvia Bordiga, Unni Olsbye
Summary: The transition to decentralized chemical plants using distributed feedstocks requires simpler downstream unit operations. Through the study of a series of isomorphically substituted zeotype catalysts, it was found that M(II)-substituted MAPO-18s demonstrate superior performance in the methanol to olefins (MTO) reaction, and co-feeding experiments revealed the inhibiting effect of CO on olefin hydrogenation.
Article
Engineering, Chemical
Karoline Kvande, Moses Mawanga, Sebastian Prodinger, Bjorn Gading Solemsli, Jia Yang, Unni Olsbye, Pablo Beato, Edd Anders Blekkan, Stian Svelle
Summary: By studying the stepwise mechanism of Cu-zeolites for direct methane activation to methanol (MTM), it is possible to achieve high selectivity in methanol production. This study investigates the acidity and nature of Cu-sites in MCM-22, an untested material for MTM, using adsorption/desorption experiments with n-propylamine, NH3, and CH4. The Cu-exchanged zeolites show moderate performance in MTM (approximately 0.10 mol(MeOH)/mol(Cu)), and the results obtained from MCM-22 are used to search for structure-activity relationships by comparing with other zeolite frameworks. CO-adsorption FT-IR spectroscopy experiments reveal the presence of multiple distinct Cu-sites in MCM-22, one of which is likely associated with inactive Cu species. NH3 adsorption/desorption experiments indicate that the number and strength of Bronsted acid sites before Cu exchange are limited, resulting in a low concentration of C-H-activating Cu-oxo species.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Jun Ke, Wen-De Hu, Yu-Jue Du, Yang-Dong Wang, Chuan-Ming Wang, Zai-Ku Xie
Summary: Through microkinetic simulations, this study reveals that the MTO conversion in H-SAPO-34 zeolite mainly occurs through the olefin-based cycle under different reaction conditions. By controlling the reaction conditions, the contribution ratio of the aromatic-based and olefin-based cycles can be adjusted, which is essential for catalyst and process optimization.
Article
Chemistry, Applied
Tomas Cordero-Lanzac, Cristina Martinez, Andres T. Aguayo, Pedro Castano, Javier Bilbao, Avelino Corma
Summary: This study investigates the synergies between oxygenates (especially dimethyl ether) and n-pentane at low OX/nC(5) ratios, enhancing n-pentane conversion while reducing catalyst coking rate. The analysis of used catalysts reveals that dimethyl ether exhibits higher reactivity than methanol in forming coke structures.
Article
Energy & Fuels
Tingyu Liang, Jialing Chen, Zhangfeng Qin, Sen Wang, Pengfei Wang, Fang Jin, Mei Dong, Jianguo Wang, Weibin Fan
Summary: A series of H-ZSM-5 catalysts with different Si/Al ratios were prepared and their Methanol to Olefin (MTO) performance was investigated. The results showed that the density of Brønsted acid sites (BAS) significantly influenced the reaction pathways, but had little effect on the activity of aromatic hydrocarbon pool (HCP) species.
Article
Chemistry, Inorganic & Nuclear
Xin Zhang, Hexun Zhou, Yiru Ye, Xinyu You, Xue Zhou, Shican Jiang, Kun Liu, Abhishek Dutta Chowdhury
Summary: This study focuses on improving the catalyst durability of zeolite FER-catalyzed methanol-to-hydrocarbon (MTH) process through material design, catalysis optimization, and advanced characterization. By optimizing the physicochemical properties, a unique flake-shaped FER zeolite with superior lifetime was developed. Combining it with Y2O3 further increased the catalyst lifespan and exhibited preferential selectivity for C4-C7 hydrocarbons.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Xin Zhang, Hexun Zhou, Yiru Ye, Xinyu You, Xue Zhou, Shican Jiang, Kun Liu, Abhishek Dutta Chowdhury
Summary: This study reports a unique flake-shaped FER zeolite with optimized physicochemical properties that offers a potential alternative catalyst for the MTH process. By combining it with Y2O3, a superior catalyst lifespan and selectivity were achieved compared to traditional FER zeolite.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Veronica Papa, Johannes Fessler, Francesco Zaccaria, Julien Hervochon, Phong Dam, Christoph Kubis, Anke Spannenberg, Zhihong Wei, Haijun Jiao, Cristiano Zuccaccia, Alceo Macchioni, Kathrin Junge, Matthias Beller
Summary: In this study, several imidazolylphosphine pincer ligands and corresponding Mn complexes were synthesized, characterized, and studied in depth using experimental and theoretical investigations. The complexes showed good to excellent performance in various hydrogenation reactions, particularly in the reduction of N-heterocycles. Spectroscopic studies provided evidence for a classical metal-ligand cooperative mechanism and identified amido and hydrido species.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Oncology
Guanghao Wu, Biying Chen, Junjie Jiang, Yiran Chen, Yanyan Chen, Haiyong Wang
Summary: This study reveals the predictive capability of pyroptosis in immunotherapy for melanoma. By developing a pyroptosis-based model, it is reliable to predict the clinical benefits and survival outcomes of melanoma patients receiving immunotherapy.
Article
Oncology
Yuchu Zhao, Shiting Yu, Yue Wang, Yanyan Chen, Jingjing Chen, Jiawen Wang, Meichen Liu, Siming Wang
Summary: The study found that the water-soluble total protein extract from Pueraria Lobata Radix (PLP) had a strong inhibitory effect on tyrosinase activity and melanin synthesis in B16 melanoma cells. Mechanistically, PLP downregulated the expression of MITF-related melanogenic enzymes and induced apoptosis through mitochondria-related pathways. Additionally, PLP regulated antioxidant enzymes to reduce reactive oxygen species levels and inhibit melanogenesis.
MOLECULAR MEDICINE REPORTS
(2023)
Article
Chemistry, Physical
Qiuming Zhou, Sen Wang, Zhiwei Wu, Zhangfeng Qin, Mei Dong, Jianguo Wang, Weibin Fan
Summary: The pore structure and acidic property of ZSM-5 zeolite were controlled using an NH4HF2 and K2CO3 post-treatment method to improve its catalytic activity and stability in alkane aromatization. The Pt/KZSM-5(deAl) catalyst exhibited high conversions and aromatic selectivities for n-heptane, n-octane, and n-nonane, and showed a long catalytic lifetime. The regulation of pore structure and acidity reduced cracking reactions and enhanced the interaction between Pt and ZSM-5 zeolite.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Hao Yu, Minghao Dou, Shuang Wang, Yuye Cheng, Zhiqiang Li, Hongyu Shao, Mengjie Yao, Xinrui Wang, Yanyan Chen, Shenjie Li
Summary: A convenient and safe coordination-assisted self-assembly method was used to encapsulate quantum dots into metal-organic frameworks and further formed AgInS2@ZIF-8/ZnS nanostructures. This improved their photocatalytic hydrogen production performance and cycling stability.
ACS APPLIED NANO MATERIALS
(2023)
Article
Engineering, Environmental
Hongwei Li, Yuanming Lai, Huyuan Zhang, Yanyan Chen, Wangtao Jiang, Yan Tian, Jiachuan Ran
Summary: This paper presents a refined closed-form solution for evaluating the mechanical behavior of the composite lining-ground interaction in cold-region tunnels. The solutions for moment, thrust, radial displacement, and contact stress have been derived based on the unified strength theory. The usefulness of this method in tackling ground-structure interaction problems in cold regions is demonstrated through studying the equations for the lining-ground interaction behavior.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Tianqing Zhou, Shaoze Wang, Chaojian Zhang, Yue Yao, Yanyan Chen, Shuxiang Lu, Xiaoyuan Liao
Summary: Improving catalysts' desulfurization capacity is crucial for environmental protection. NH2-MIL-125 material, a MOF material with good adsorption properties, was prepared using a hydrothermal method. The dried materials at different temperatures were analyzed using XRD, FT-IR, SEM, and physical adsorption. Experiment results showed that NH2-MIL-125@150 degrees C had the highest desulfurization capacity, followed by NH2-MIL-125@200 degrees C and NH2-MIL-125@250 degrees C, while NH2-MIL-125@110 degrees C had the lowest capacity.
Article
Oncology
Yanyan Chen, Guoxin Cai, Junjie Jiang, Chao He, Yiran Chen, Yongfeng Ding, Jun Lu, Wenyi Zhao, Yan Yang, Yiqin Zhang, Guanghao Wu, Haiyong Wang, Zhan Zhou, Lisong Teng
Summary: This study examined the heterogeneity of primary and peritoneal metastasis (PM) samples in gastric cancer (GC) patients using quantitative proteomics and whole-exome sequencing. Proteomic features enriched in RNA binding and extracellular exosomes were observed in PM samples. A ten-protein signature was derived by machine learning, which was significantly associated with patient prognosis. This signature could guide risk stratification and individualized treatment.
Article
Engineering, Geological
Hongwei Li, Yuanming Lai, Huyuan Zhang, Yanyan Chen, Wangtao Jiang, Jiachuan Ran
Summary: A refined closed-form analytical solution is developed to evaluate the mechanical behavior of composite lining-ground interaction under the coupling effects of anisotropic frost heave and dynamic loads in cold regions. The composite lining is considered homogenized, consisting of an inner thin-walled shell and an outer thick-walled cylinder embedded in an isotropic medium. The proposed solutions, based on elasticity theory, are more suitable for predicting the mechanical behavior of composite lining-ground interaction under anisotropic frost action. The analytical solutions can address soil-structure interaction problems in cold regions.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Yanyan Chen, Shenjie Li, Zhiqiang Li, Wanqing Li, Hongyu Shao, Minghao Dou, Yuye Cheng, Xiangling Wan, Xiuxian Jiang, Zhengguang Zhang
Summary: Water-soluble nonrare metal Ag-Sn-S nanocrystals (ATS NCs) were synthesized at room temperature using the interfacial nucleation mechanism. The synthesized ATS NCs exhibited a band gap of 2.32 to 2.59 eV, giving them a high redox ability and very high photocatalytic degradation rate. The interfacial regulation of acid protonation on the surface of ATS NCs resulted in more defect states, which improved the photocatalytic oxidation degradation efficiency. The ATS NCs showed potential for practical treatment of large-scale industrial wastewater.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Fung-Kit Tang, Yanyan Chen, Daniel Nnaemaka Tritton, Zongwei Cai, Ken Cham-Fai Leung
Summary: A class of rhodamine-based fluorescent sensors that can selectively and sensitively detect Pd2+ metal ions in aqueous media have been developed. These sensors, PMS and PRS, exhibit colorimetric and fluorescent changes when exposed to Pd2+, due to the opening and restoring of their spirolactam rings. PRS has high selectivity for Pd2+ over 22 other metal ions, with a 0.6-fold ratiometric difference at I-600nm/I-515nm. The closed form of the lactam ring in PRS-Pd can be switched back in the presence of various thiols, providing a red-green traffic light detection mechanism. PRS also shows excellent cell viability and can be used to image Pd2+ and detect biothiols in cancer cells.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Lina Liu, Zhihong Wei, Qiang Chen, Chaoren Shen, Tonghao Shen, Xinxin Tian, Si-Dian Li
Summary: Reliable geometrical and energetic references for B-n clusters were established using full configuration interaction (FCI) and multi-reference configuration interaction methods (MRCI). The computed results were confirmed to be accurate based on comparison with experimental data. Among the tested methods, the VSXC functional showed the best performance in predicting the relative energies of B-1-B-4 clusters.
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Yinghao Zhao, Hualan Zhou, Mengzhen Song, ZeXin Xu, Zhiwei Sun, Qianhui Xu, Yanyan Chen, Xiaoyuan Liao
Summary: Adsorption technology is a promising method for removing pollutants in fluids, and Ti-MOFs are widely used as efficient adsorbents. However, the use of Ti-MOFs with different morphologies for dye removal has not been reported. In this study, three kinds of Ti-MOFs with different morphologies were prepared and tested for adsorbing different dyes. It was found that the truncated octahedron Ti-MOFs showed the best removal efficiency for the cationic dye methylene blue. The adsorption process was exothermic and followed a pseudo-second-order/Freundlich isotherm model. The results also showed that the adsorption performance was dependent on the facet orientation, with truncated octahedron Ti-MOFs exhibiting the highest adsorption capacity among the three morphologies. This research provides a highly efficient adsorbent for industrial dye wastewater remediation.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Green & Sustainable Science & Technology
Shasha Zheng, Zhihong Wei, Bartosz Wozniak, Fabian Kallmeier, Eszter Barath, Haijun Jiao, Sergey Tin, Johannes G. de Vries
Summary: This article introduces a strategy for synthesizing benzenoid aromatics from bio-based feedstock, which shows the potential to replace fossil-based resources in aromatics production.
NATURE SUSTAINABILITY
(2023)
Article
Chemistry, Multidisciplinary
Yingjie Li, Penghui Li, Chaojian Zhang, Kai He, Yanyan Chen, Xiaoyuan Liao
Summary: The dual Zn source (DZS) strategy was used to prepare high-quality and high-output ZIF-8, eliminating waste acid and improving the yield. The resulting ZIF-8 had a large surface area (1571 m(2) g(-1)) and a unique diamond dodecahedron morphology, showing excellent adsorption desulfurization ability (19 mg g(-1)). The introduction of Zn(OH)(2) or ZnO facilitated the diffusion of the LUMO orbital, enhancing the electron accepting ability and accelerating the formation of ZIF-8 crystals. Most importantly, the DZS method allowed for the direct reuse of the resultant mother liquor, achieving zero-discharge.