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918 results on '"Li-Yong Wang"'

53. Stabilized ε-Fe2C catalyst with Mn tuning to suppress C1 byproduct selectivity for high-temperature olefin synthesis.

Author

Qian, Fei, Bai, Jiawei, Cai, Yi, Yang, Hui, Cao, Xue-Min, Liu, Xingchen, Liu, Xing-Wu, Yang, Yong, Li, Yong-Wang, Ma, Ding, and Wen, Xiao-Dong

Subjects
ALKENES, PRUSSIAN blue, CATALYSTS, CATALYTIC activity, MANUFACTURING processes
Abstract

Accurately controlling the product selectivity in syngas conversion, especially increasing the olefin selectivity while minimizing C1 byproducts, remains a significant challenge. Epsilon Fe2C is deemed a promising candidate catalyst due to its inherently low CO2 selectivity, but its use is hindered by its poor high-temperature stability. Herein, we report the successful synthesis of highly stable ε-Fe2C through a N-induced strategy utilizing pyrolysis of Prussian blue analogs (PBAs). This catalyst, with precisely controlled Mn promoter, not only achieved an olefin selectivity of up to 70.2% but also minimized the selectivity of C1 byproducts to 19.0%, including 11.9% CO2 and 7.1% CH4. The superior performance of our ε-Fe2C-xMn catalysts, particularly in minimizing CO2 formation, is largely attributed to the interface of dispersed MnO cluster and ε-Fe2C, which crucially limits CO to CO2 conversion. Here, we enhance the carbon efficiency and economic viability of the olefin production process while maintaining high catalytic activity. Epsilon Fe2C is considered a promising catalyst for syngas conversion due to its inherently low CO2 selectivity, but its application is limited by poor high-temperature stability. Here the authors present a successful method for synthesizing highly stable ε-Fe2C using a nitrogen-induced strategy through the pyrolysis of Prussian blue analogs. [ABSTRACT FROM AUTHOR]

Published
2024
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89. Effect of ammonium salt on the distribution of titanium species in the synthesis of TS-1 zeolites

Author

Dong-Bo Cao, Xian-qing Li, Guo-qiang Ding, Li Yong-Wang, Hongxing Wang, Haohao She, and Yulei Zhu

Subjects
chemistry.chemical_classification, Anatase, Chemistry, chemistry.chemical_element, Salt (chemistry), law.invention, Amorphous solid, chemistry.chemical_compound, law, Phase (matter), Ammonium, Crystallization, Zeolite, Nuclear chemistry, Titanium
Abstract

Titanium silicalite (TS-1) zeolites with different distribution of Ti species were synthesized through altering different amounts of (NH4)2SO4 as crystallization-mediating agent. The distribution of titanium species of TS-1-X samples (X represents the molar ratio of (NH4)2SO4 to SiO2) was systematically investigated via ICP-AES, FT-IR, UV-vis, UV-Raman and other techniques. The TS-1-X zeolite samples were applied in the epoxidation of 1-hexene reaction. It was found that the appropriate amount of ammonium salt not only facilitated the enrichment of titanium species from liquid phase to solid phase and promoted the incorporation of Ti into the MFI skeleton, but also resulted in the formation of uniformly small TS-1 crystals due to the inhibition of rapid growth of crystals. However, much more amounts of (NH4)2SO4 led to the formation of extra-framework Ti, including anatase TiO2 and amorphous Ti species. Meanwhile it promoted the rapid growth of grain resulting in larger TS-1 crystals. Ti-rich TS-1 sample synthesized with molar ratio of (NH4)2SO4 to SiO2 of 0.2 exhibited higher conversion of 1-hexene (42%) and effective utilization of H2O2 (81.8%). In addition, the effect of ammonium salt's composition on the properties of TS-1 was investigated by experiments and characterizations. It was found that ammonium salt could regulate the process of crystallization through its own anion and changing pH of the synthesis gel.

Published
2021
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92. Abnormal in LMNA Triggers a Shift in Intracellular Metabolic Homeostasis Via AMPK Activation

Author

Ying Zhou, Jia-jie Yang, Yuan Cheng, Ge-xuan Feng, Rong-hui Yang, Yuan Yuan, Li-yong Wang, and Lu Kong

Subjects
oncology_oncogenics
Abstract

Laminopathies are a spectrum of diseases caused by LMNA mutations. In familial partial lipodystrophy of Dunnigan (FPLD), LMNA plays role in the differentiation and development of adipocytes and lipid metabolism. Changes in LMNA predict not only the differentiation of adipose-derived mesenchymal stem cells (AD-MSCs) but also the transformation of cancer cells. Hence, our in-depth study aimed to identify the molecular connection between disordered lipid metabolism and hepatic carcinogenesis. We first discovered significant positive correlations between pLMNA and two key rate-limiting enzymes in de novo fatty acid synthesis, acetyl-CoA-carboxylase 1 (ACC1) and fatty acid synthase (FASN), in the liver tissue but not in adipose tissue of obese model rats. Moreover, LMNA knockdown (KD) in rat AD-MSCs prevented the differentiation and maturation of adipocytes. To clarify the mechanistic relationship with lipogenesis, gain- and loss-of-function experiments in which functional changes and the related molecular pathways were investigated in a normal hepatocyte line (7701 cells). Adenosine 5'-monophosphate activated protein kinase α (AMPKα) was found to be activated by abnormalities in the LMNA structure under conditions of LMNA deletion, farnesyltransferase inhibitor (FTI) treatment and LMNA mutations associated with clinical FPLD pathogenic phenotype. Active AMPKα could directly phosphorylate ACC1 and thus inhibit lipid synthesis but induced glycolysis in both HCC cells and normal cells. The HCC cells could not survive with LMNA knockout (KO) or even KD. Lonafarnib (an FTI) combined with low-glucose conditions significantly decreased the proliferation of HepG2 and MHCC cells by inhibiting glycolysis and the maturation of prelamin A.

Published
2022

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