RSC Advances
·
2015
·Vol. 5
·期 118
·97256-97263
·
IF 3.84
Qianqian Huang,Weiqiang Yu,Rui Lu,Fang Lu,Jin Gao,Hong Miao,Jie Xu
Catalytic conversion and application of bio-based platform chemicals is of great significance. Itaconic acid, one of the abundant and renewable bio-based platform chemicals, could be hydrogenated to produce methylsuccinic acid, which has important applications in pharmaceutical synthesis. Traditional catalysts can be corroded, leached and deactivated in an acid reaction environment, and the stability of the catalysts is a great challenge. Carbothermal reduction was employed to prepare stable ruthenium-based catalysts, and the results confirmed that CO generated in situ functioned as an efficient reducing species in the carbothermal reduction process. The catalysts were applied for the hydrogenation of itaconic acid, and showed good stability and resistance to acid with no obvious loss of activity and less leaching in recycling tests compared to hydrogen reduced samples which exhibited an apparent decrease of 22% for the conversion of itaconic acid. The carbothermal reduced catalysts could maintain 99% conversion and 99% selectivity for methylsuccinic acid, and maintained good stability and acid-resistance under a higher temperature and longer reaction time.
研究领域:
催化化学
·
绿色化学
·
生物质转化
·
有机合成
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材料化学
·
工业催化
·
可持续能源
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 19
·26869-26876
·
IF 4.527
Shao-Min Lin,Ya-Ling Yu,Ming-Feng Zhong,Huan Yang,Chen-Yang Zhang,Zhi-Jie Zhang,Wei Xu,Jiong-Yan Xie,Yu-Chun Qiu
Converting the γ phase into the α phase completely is necessary in the presintering stage of industrial alumina (Al 2 O 3 ), which requires high temperature and energy consumption. To reduce the presintering temperature, γ-Al 2 O 3 was activated by oxalic acid . XRD , 27 Al-MAS-NMR and TG-DSC were used to characterize the γ - alumina before and after activation, and the phase transformation was studied. The formation temperature of α-Al 2 O 3 decreased to 1029 °C for oxalic acid activated γ-Al 2 O 3 , and the α-fraction was 100% for activated γ-Al 2 O 3 at 1300 °C. After oxalic acid activation , the diffraction peak intensity of γ-Al 2 O 3 decreased significantly; the results of 27 Al-MAS-NMR suggested that octahedral [AlO 6 ] in γ-Al 2 O 3 was easier than tetrahedral [AlO 4 ] to be attacked by oxalic acid , and the formation of pentavalent [AlO 5 ] with higher reaction activity, which was in favour of the lowering formation temperature of α-Al 2 O 3 . The dissolution concentration of Al increased after oxalic acid activation, and the dissolution process was controlled by surface reactions. Oxalic acid mainly attacked the octahedral aluminium in γ-Al 2 O 3 and extracted Al as three complexes of [Al(C 2 O 4 )] + , [Al(C 2 O 4 ) 2 ] - and [Al(C 2 O 4 ) 3 ] 3- . Oxalic acid activated γ - Al 2 O 3 with a lower phase transformation temperature has broad application prospects in the alumina industry.
研究领域:
材料化学
·
无机化学
·
固态化学
·
工业催化
·
陶瓷材料
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Shu-Sen Liu,Yong-Yong Jin,Yahong Han,Jinxian Zhao,Jun Ren
It is a big challenge to improve the stability and anti-coking abilities of catalyst in high temperature CO methanation reaction. To address the issue, SiC was chose as the support, and Ce was used as a promoter to prepare supported Ni catalysts for CO methanation. A long-term high temperature stability evaluation experiment was carried out at 600 °C for 100 h in comparison with Ni/Al 2 O 3 catalyst. The catalysts were characterized by a combination of characterization techniques for understanding the catalytic performance and carbon deposition behaviors in CO methanation. The life test result indicates that, compared to Ni/Al 2 O 3 , Ni/SiC is thermally stable and highly resistant to carbon deposition . Improved cataytic activity and stability was further reached by introduce of Ce promoter into Ni/SiC, which can be attributed to the enhanced interaction between Ni and SiC and improved dispersion of Ni active species.
研究领域:
催化化学
·
能源化学工程
·
材料科学
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工业催化
·
化学反应工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 35
·
IF 1.866
Yuanzhu Long,Fuhua Sun,Chao Liu,Dong Huang,Xingyi Xie
To explore a new blowing agent for polyurethanes (PUs), palmitic acid was grafted onto a branched polyethyleneimine (bPEI; weight-average molecular weight = 25,000 Da) via N,N ′-carbonyldiimidazole condensation to form a hydrophobically modified bPEI [palmitic acid grafted branched polyethyleneimine (C 16 –bPEI)] with a grafting rate of 12%. A CO 2 adduct of C 16 –bPEI, which trapped 16.8% CO 2 in it, was synthesized from C 16 –bPEI. The long alkyl chain grafting improved the dispersibility of the CO 2 adduct in the PU raw materials and favored a homogeneous release of CO 2 to blow PUs during the exothermic foaming process. The preliminary results show that the foams possessed a density of 72.0 kg/m 3 and a compressive strength of 246 kPa; this matched the required values of foams for the thermal insulation of underground steel pipes. This new blowing agent emitted nothing but CO 2 to the atmosphere, so it will not promote ozone depletion and will avoid global warming problems that are associated with traditional blowing agents such as chlorofluorocarbons and hydrochloroflourocarbons. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43874.
研究领域:
高分子化学
·
材料科学
·
绿色化学
·
能源与环境材料
·
工业催化
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 1
·51418
·
IF 3.125
Lan Hao,Xulin Cui,Xiaoli Wu,Jingtao Wang,Yifan Li,Wenpeng Li,Xingzhong Cao,Haoqin Zhang
Efficient separation of aromatic-aliphatic hydrocarbon mixtures has long been an important topic in chemical industries. Organic nanofiltration (OSN) has been revealing great promise in separating solvent mixtures that has not been effectively resolved by the state-of-the-art technologies. Herein, novel OSN membranes are designed for the separation of toluene and n -heptane. Polyamide active layer with diaminonaphthalene as the aqueous phase monomer is prepared by interfacial polymerization for the first time. The addition of polydimethylsiloxane gutter layer, as well as the combination of spin coating technique and macroporous substrate, renders the membranes with loose and defect-free architectures. The as-designed membranes achieve a rather high selectivity of toluene over n -heptane (>4) together with ultra-high toluene permeance (>180 L m −2 h −1 bar −1 ). These membranes also present excellent stability in the long-term operation.
研究领域:
材料科学
·
膜分离技术
·
化学工程
·
纳米技术
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高分子化学
·
工业催化
·
绿色化学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2021
·
IF 2.775
Zhendong Wang,Shuo Chen,Bingxiao Feng,Hongbing Song,Meng Xiao,Hengjun Gai,Tingting Huang
Extracting phenol from coal tar has great economic significance. In this paper, a process for separating phenol from coal tar using mono-ethanolamine (MEA) as extractant was proposed, the conceptual design and optimized of the process was carried out by using Aspen Plus software. To ensure the accuracy of simulation, the vapor-liquid equilibrium data of MEA + phenol binary system were measured under different pressures. The binary interaction parameters of NRTL model, Wilson model and UNIQUAC model were fitted with the experimental data by data regression system. The results show that the deviation of NRTL model is less than that of Wilson model and UNIQUAC model. Considering that the boiling point difference between MEA and phenol is only 10°, two energy-saving schemes of double effect distillation are introduced into the conceptual process proposed in this paper, which can save 20% and 44.8% respectively compared with the traditional single tower distillation process . This paper provides reference for the industrial application of MEA in the extraction of phenol from coal tar.
研究领域:
化学工程
·
分离科学
·
热力学
·
能源化工
·
工业催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）