KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·Vol. 41
·期 6
·1665-1678
·
IF 2.9
Liu Yanyan,Wang Zhiheng,Li Xin,Gao Ruiyao,Sun Jiong,Liu Jiankun,Yao Songdong
To investigate the potential utilization of MOF templates in hydrodesulfurization (HDS) of large sulfur-containing compounds, MOF-derived Ni 2 P was prepared and characterized by XRD, TG, SEM, TEM, XPS and Raman. The findings indicate that MOF-derived Ni 2 P catalyst exhibits significantly enhanced Hydrodesulfurization (HDS) activity compared to conventional unsupported Ni 2 P. A modified pyrolysis and phosphiding condition allowed the stacking of central Ni atoms to be aggregated loosely, and morphology of MOF-derived Ni 2 P can be controllably transmitted from polyhedral to petal-like. A lower pyrolysis temperature tends to reduce density of Ni aggregates and cluster size of Ni 2 P(111), thereby facilitating the phosphiding of Ni aggregates and enhancing the catalytic activity of MOF-derived Ni 2 P in HDS process. Increasing the duration time of pyrolysis at lower temperatures does not accelerate the aggregation of particles, but makes petals on surface of MOF-derived Ni become thinner and eventually disappear, until coral-like nanosphere aggregates with uniform size are formed. The gradually elimination of MOF framework renders nickel aggregates more susceptible to phosphiding. The collapse of pore structure of MOF template can impact HDS activity of MOF-derived Ni 2 P. Prolonging pyrolysis time causes the spacing between Ni 2 P clusters to diminish, thereby significantly decreasing reactivity of Ni 2 P-400-4-275 compared to Ni 2 P-400-2-275 in DBT–HDS.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Energetic Materials Frontiers
·
2025
·
IF 3.9
Rui-min Tang,Chen Wang,Mao-guo Zhu,Liang-liang Sun,Jian-xing Yang,Su-hang Chen,Feng-qi Zhao,Kang-zhen Xu
The pyrolysis behavior and mechanism of energetic materials are crucial for assessing their safety and application. In this study, the pyrolysis behavior, gas-phase decomposition products, condensate phase products and pyrolysis mechanism of high nitrogen compound 4,4’,6,6’-tetri(azide)-hydrazine-1,3,5-triazine (TAHT) were fully studied through differential scanning calorimetry (DSC), thermogravimetric analysis (TG), thermogravimetric-infrared-mass spectrometry (TG-IR-MS) and in-situ infrared spectroscopy. The results indicate that the thermal behavior of TAHT exhibits a big exothermic decomposition process and an endothermic decomposition process accompanied by mass loss of 42.5 % and 52.1 %, respectively. At the heating rate of 10 o C·min -1 , the peak temperature ( T p ) and decomposition enthalpy of exothermic decomposition process are 230.4 o C and -2021.0 J·g -1 , respectively. The peak temperature ( T p ) of endothermic decomposition process is 703.5 o C. In the exothermic decomposition stage, the main gas-phase decomposition products of TAHT is N 2, and contains small amounts of NH 3 and HCN, the hydrazine bond and azide groups in the condensed-phase almost completely disappear during the pyrolysis process, and the residues form a network structure of triazine ring. Based on the analysis of gas-phase and condensed-phase products, a possible pyrolysis mechanism for TAHT is proposed. This work provides valuable theoretical insights for the application of TAHT as a new green energetic material.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 31
·e202201268
·
IF 2.307
Aixiao Fu,Mengqing Sun,Shifeng Jiang,Huanfei Xu,Guoqiang Xu
Graphical Pyrroles are important nitrogen-containing compound. Here, we constructed N, P-doped activated carbon supported Ir to perform the synthesis of pyrroles from alcohols and amino alcohols. The unique performance is attributed to the interaction between Ir and N, P-doped activated carbon. Pyrroles are a significant class of nitrogen-containing heterocyclic compounds and the derivatives. Here, an efficient procedure has been proposed for the loading of Ir on N, P-doped activated carbon to exploit pyrroles are synthesized from alcohols and amino alcohols. And the optimal conversion of 1-phenylethanol is up to 65 % with 2-phenylpyrrole selectivity of 80 %. The good performance is attributed to the interaction between metal Ir and N, P-doped activated carbon, which could also be confirmed from BET and XPS characterizations. What's more, the catalyst could be generally used for a range of reactions to produce pyrroles from alcohols and amino alcohols.
研究领域:
有机化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Changqu Lin,Lulu Xu,Yue Zhuang,Peipei Ma,Hongli Wu,Haifeng Gan,Fei Cao,Ping Wei
The cleavage of C-C bonds to generate small molecules is a pivotal strategy for integrating shell bio-refinery products into the conventional chemical industry. Herein, we synthesized a novel bifunctional acetylacetone molybdenum-based catalyst with oxygen vacancies and acid sites (Ov-Mo-acac), which catalyze the retro -aldol reaction of N -acetylglucosamine (NAG), consequently the condensation with acetylacetone and dehydration to co-produce furan and pyrrole compounds. Reaction optimization resulted in a remarkable yield of 95 % for N-acetyl-3-acetyl-2-methyl pyrrole (AMAP) and 74 % for 5-(1,2-dihydroxyethyl)-2-methyl-3-acetylfuran (DMAF) from NAG at 90 ℃ for 3 h. XPS, EPR, and Raman confirmed the reduction of molybdenum from the Mo 6+ to Mo 5+ and Mo 4+ , and oxygen vacancies on the surface. Furthermore, the catalyst has Lewis and Brønsted acidic sites, as evidenced by py-FTIR and 1 H MAS NMR. The study offers a new approach to utilizing shellfishery waste and sheds the function of oxygen vacancies on Mo-based catalysts for the retro -aldol reaction of carbohydrates.
研究领域:
生物化学
·
催化化学
·
生物质能
✓ 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）