ENERGY & FUELS
·
2019
·
IF 3.021
Xiayi Hu,Qian Yu,Yuanyuan Cui,Juntao Huang,Elenica Shiko,Yefeng Zhou,Zhaogang Zeng,Yang Liu,Rui Zhang
The main issue for the development of CO2 capture in industry is its high energy cost. In this work, the regeneration of the chemical solvent 3-(diethylamino)propylamine (DEAPA) with or without catalyst was studied to further reduce the energy consumption. Three different catalysts (SAPO-34, MCM-41, and SO42–/TiO2) were applied into the DEAPA system to enhance the energy efficiency by lowering the heat cost per mole of CO2 released in a CO2 stripping process. The results show that solely DEAPA (without catalyst) can increase the CO2 desorption rate by 37.28%, increase the cyclic capacity by 38.02%, and reduce the heat duty by 14.85% compared to 5 M monoethanolnamine (MEA). In addition, for the catalyst–DEAPA systems, DEAPA-SAPO-34, DEAPA-MCM-41, and DEAPA-SO42–/TiO2 could lower the heat duty by 33.08%, 27.79%, and 22.41%, respectively, relative to 5 M MEA. The SAPO-34 catalyst also shows a better efficiency for increasing the CO2 desorption rate and cyclic capacity compared to the other two catalysts used. Moreover, a possible catalytic mechanism for CO2 desorption from the DEAPA–catalyst system is proposed based on the results from catalyst characterization. Through comparing the parameters of each catalyst, it can be inferred that the mesopore surface area (MSA) and the total acid sites (TAS) are the critical factors for an efficient catalyst. The combination of MAS*TAS could especially act as a key value to evaluate the performance of a catalyst for catalytic CO2 desorption.
研究领域:
化学工程
·
环境科学
·
催化
✓ 已验证
DOI
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 11
·
IF 2.504
Chao Chen,Lei Cai,Xinchen Shangguan,Liang Li,Yanping Hong,Guoqiang Wu
Developing high-efficiency hetero-catalysts for transesterification reaction is of great importance in the production of biodiesel from Jatropha curcas L. seed oil (JO). Here, we synthesized a series of sulfated TiO2 by treating with varying H2SO4 concentration (SO42−/TiO2) and TiO2 catalysts and applied to the transesterification of JO. Furthermore, these heterostructures were characterized by many characterization methods including XRD, FT-IR, N2-adsorption, SEM, TEM, TG, py-IR and NH3-TPD, and their catalytic performance was investigated under various operating conditions. The results reveal that both the Brønsted and Lewis acid sites are presented in the SO42−/TiO2 catalysts, while only Lewis-type sites are observed in the TiO2 catalyst. And the acid intensity, surface area and mesoporous volume of catalysts are improved obviously after treating TiO2 with sulfuric acid. Then the SO42−/TiO2 catalysts exhibit much higher catalytic activity than TiO2 catalyst, which is attributed to the larger surface area and mesoporous volume and stronger acidity. Furthermore, the reusability behaviour of 1.5 SO42−/TiO2 catalyst in the transesterification of JO was also studied.
研究领域:
催化化学
·
可再生能源
·
纳米材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Yaoyao Peng,Lei Song,Siru Lu,Ziyu Su,Kui Ma,Siyang Tang,Shan Zhong,Hairong Yue,Bin Liang
The significant decrease of acid sites caused by alkali metal poisoning is the major factor in the deactivation of commercial V 2 O 5 -WO 3 /TiO 2 NH 3 -SCR catalysts. In this work, the solid superacid SO 4 2− -TiO 2 modified by sulfate radicals, was selected as the catalyst support, which showed superior potassium resistance. The physicochemical properties and K-poisoning resistance of the V 2 O 5 -WO 3 /SO 4 2− -TiO 2 (VWSTi) catalyst were carried out by XRD, BET, H 2 -TPR, NH 3 -TPD, XPS, in situ DRIFTS and TG. The results pointed out that the introduction of SO 4 2− significantly increased the NH 3 -SCR catalytic activity at high temperatures, with an exceptionally high NO x conversion over 90% between 275 °C and 500 °C. When 0.5% (mass) K 2 O was doped on the catalysts, the catalytic performance of the traditional V 2 O 5 -WO 3 /TiO 2 (VWTi) catalyst decreased significantly, while the VWSTi catalyst could still maintain a NO x conversion over 90% in the range of 300–500 °C. The characterizations suggested that the support of SO 4 2− -TiO 2 greatly increased the number of acidic sites, thereby enhancing the adsorption capacity of the reactant NH 3 . The results above demonstrated a potential approach to achieve superior potassium resistance for NH 3 -SCR catalysts using solid superacid.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Zhixian Huang,Yixiong Lin,Ling Li,Changshen Ye,Ting Qiu
The solid acid SO 4 2 − /TiO 2 was prepared by immersion method and applied for synthesis of propylene glycol methyl ether acetate (PMA) through esterification reaction of propylene glycol monomethyl ether (PM) and acetic acid (HAc). The optimal catalyst preparation condition was determined by orthogonal analysis of parameters in a five-factor and four-level test. The obtained solid acid catalysts were characterized in detail by means of X-ray powder diffraction, thermogravimetry, pyridine adsorbed IR analysis, scanning electron microscopy, and BET surface area method. Synthesis of PMA was studied in this paper through experimental investigation of reaction conditions such as temperature, molar ratio of reactants, catalyst dosage and agitation speed. Based on its possible reaction mechanism, a pseudo-homogeneous kinetic model was established and its activation energies E a + and E a − , 65.68 × 10 3 J·mol − 1 and 57.78 × 10 3 J·mol − 1 , were estimated. To prepare shaped solid acid catalyst SO 4 2 − /TiO 2 , the shaping method of impregnation–shaping–impregnation was applied. The optimal molding formulation of solid acid catalyst, obtained from the orthogonal test, was found to be binder 7 wt.%, reinforcing agent 20 wt.%, pore forming material 2.5 wt.%, and lubricant 4 wt.%. The results of performance test of catalyst demonstrated that the shaped solid acid catalyst exhibited high activity and stability.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2014
·
IF 3.309
Huiling Li,Aojie Deng,Junli Ren,Changyu Liu,Wenju Wang,Feng Peng,Runcang Sun
One of the most promising strategies for furfural production is to extract continually the target product from the aqueous solution utilizing organic solvents. With the aim to develop an ecologically viable catalytic pathway for furfural production without the addition of mineral acids, we presented a modified biphasic system using a solid acid (SO 4 2− /TiO 2 -ZrO 2 /La 3+ ) as catalyst for producing furfural from xylose. Different kinds of aprotic organic solvents (DMSO, DMF and DMI) in water phase and 2-butanol in organic phase (MIBK) were investigated as reaction media. Furfural yield and xylose conversion efficiency were dependent on the amounts of aprotic organic solvents and 2-butanol, the solid/liquid ratio, and the volume ratio of the organic phase and the aqueous phase as well as the reaction temperature and time. As a result, DMI showed the best performance on improving furfural yield during the furfural production. 3563.3 μmol of furfural/g of xylose with 97.9% xylose conversion efficiency was obtained after 12 h at 180 °C when the volume ratios of water to DMI and MIBK to 2-butanol were 8:2 and 7:3, respectively.
研究领域:
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Puxiang Yan,Haiyong Wang,Yuhe Liao,Chenguang Wang
Upgrading biomass to renewable diesel and jet fuels is essential to achieve carbon neutrality. Herein, diesel and jet fuels range alkanes were produced by HAA of 2-methylfuran and furfural over solid acid SO 4 2- /TiO 2 and subsequent HDO over Pd/NbOPO 4 . A series of SO 4 2- /TiO 2 catalysts were synthesized by wetness impregnation to produce C15 fuel precursors. S/Ti-450 with a calcination temperature of 450 °C exhibited the highest activity, affording 97.9 % yield of C15 fuel precursor. Sufficient Brønsted acid sites and moderate Brønsted acid strength are responsible for the super catalytic performance of S/Ti-450. Stability studies demonstrated that S/Ti-450 could be regenerated. Furthermore, the application of S/Ti-450 in the HAA reaction was extended to other carbonyl compounds (e.g., butanal, cyclohexanone and acetone) and high yields of desired fuel precursors were obtained. Finally, C15 fuel precursor was further converted to long-chain alkanes via HDO over Pd/NbOPO 4 , yielding 85.0 % diesel and jet fuels range alkanes.
研究领域:
化学工程
·
可再生能源
·
催化科学
✓ 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）