AUSTRALIAN JOURNAL OF CHEMISTRY
·
2016
·Vol. 70
·期 6
·691-698
·
IF 1.427
Yu Shen,Fumin Wang,Chaoqun Yang,Xubin Zhang
Hierarchical HZSM-5 were synthesised by controlled desilication in alkaline medium and characterised by field-emission scanning electron microscopy, X-ray diffraction, transmission electron microscopy, inductively coupled plasma–atomic emission spectrometry, N2 adsorption–desorption, and Fourier transform infrared spectroscopy. The catalytic performance of HZSM-5 towards the selective oxidation of 2,3,6-trimethylphenol by H2O2 was evaluated. Recyclability tests were also carried out. The results showed that 2,3,5-trimethyl-1,4-benzoquinone was produced in high yields (i.e. 90 %), corresponding to a 2,3,6-trimethylphenol percentage of 98 %. The N2 adsorption–desorption and XRD studies suggested that mesopores with an average size of 5 nm were produced and that the structural character of HZSM-5 was preserved after desilication. Transmission electron microscopy analysis of the spent catalyst indicated good stability of the hierarchical structure. The Fourier transform infrared spectroscopy studies revealed the development of acid sites. The combined results suggested that the nature of the solvent, intrinsic acidity, and shape selectivity of the hierarchical structure of the catalyst ensured high catalytic properties.
研究领域:
化学工程
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Zilong Xie,Siyi Yu,Jiankun Wu,Xiao Lin,Yanping Liu,Jianzhi Wang,Jie Liu,Faquan Yu
2.3.5-trimethyl-1.4-benzoquinone (TMQ) is an important intermediate in the synthesis of vitamin E, and the oxygen oxidation of 2.3.6-trimethylphenol (TMP) is commonly used to prepare TMQ in the industry. However, the slow mass transfer of oxygen from the gas phase to the liquid phase in the gas-liquid two-phase reaction greatly limits the oxidation reaction rate. Therefore, this study presents a mild and efficient synthesis of TMQ by catalytic oxidation of TMP using high-velocity air as an oxidant in a self-built continuous flow microreactor. The continuous flow microreactor shows excellent mass transfer performance, and high- velocity air was used to drive the feedstock liquid to do circular motion. The effects of different operating conditions and microreactor parameters on TMP conversion and TMQ yield were investigated. The results show that the TMP conversion and TMQ yield reach 100% and 89.9% under the optimal conditions of the continuous flow microreactor, respectively. Compared with the tank reactors, this continuous-flow microreactor has broad application prospects in the production of TMP catalytic oxidation. In a state of continuous high-speed circular motion, efficient mass transfer in a narrow pipe enables full contact between the liquid and gas phases. As a result, reaction time is reduced from approximately 5 hours to merely 78.5 seconds.
研究领域:
化学工程
·
有机合成
·
工业催化
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Shaofang Ma,Zihan Zhu,Jianfei Xu,Jing Wang,Xinjing Tang,Wei Bian
Herein, we rationally designed and synthesized novel green-emitting fluorescent carbon dots (CDs) through cross amide formation of two precursors, benzene-1,3,5-triamine trihydrochloride and trimethyl 1,3,5-benzenetricarboxylate, under hydrothermal treatment . The average particle size of the CDs was ∼2.7 nm with graphitic carbon structures. The obtained CDs showed good photoluminescent properties with a quantum yield of up to 11.2%. The carbon dots showed good fluorescence sensitivity and selectivity for Hg 2+ , and the LOD and LOQ values were 17.5 pM and 58.3 pM in the range of 0.1–0.8 μM, which could be successfully applied to Hg 2+ detection in real water samples as well as intracellular Hg 2+ fluorescence detection .
研究领域:
材料科学
·
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Zhijin Ge,Xin'ao Li,Hui Hu,Qingming Huang,Xiaohui Chen
The pure silicon MWW were synthesized for the first time by means of a dry-gel conversion method utilizing N, N, N-trimethyl-1-adamantyl ammonium hydroxide and hexamethyleneimine as the structural directing agents. A vapor transport assisted crystallization method for obtaining complete crystallinity was developed to replace the traditional dry-gel conversion methods. TiCl 4 acid solution treatment was cleverly used for the implantation of titanium in MWW. Compared with Ti-ERB-1, the Ti content of boron- free Ti-MWW is only 20% of the former, the conversion rate of 1-hexene epoxidation is 2.3 times of the former and nearly 100% of H 2 O 2 efficiency.
研究领域:
化学工程
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）