APPLIED CATALYSIS A-GENERAL
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2018
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IF 4.521
Liqin Wang,Heqin Guo,Qilong Xie,Jungang Wang,Bo Hou,Litao Jia,Jinglei Cui,Debao Li
Furfural is one of the most valuable biomass platform compounds which is typically prepared from hemicellulose. Conversion of cellulose and its derived hexoses, which are the most abundant resource in nature, to furfural, is a big challenge. The amount of the reactive form (fructofuranose) which was beneficial to the formation of furfural and HMF, was increased when the solvent transformed from water to γ-butyrolactone (GBL)-water. The GBL promoted the adsorption of fructose on HY. The transfer of fructose from the solution to the channels of HY was enhanced with the introducing of GBL in solvent. The HY zeolite with apertures of 7.4 Å was found to promote the formation of acyclic fructose from cyclic fructose (8.6 Å) in the synergy with GBL. The Brønsted acid sites in the channels of HY favored the selective cleavage of the C C bond in acyclic fructose to xylose, and promoted the following dehydration of xylose to furfural, simultaneously. The furfural yield was increased while the 5-hydroxymethylfurfural (HMF) yield was decreased with the decrease of the Brønsted acid sites density. The maximum furfural yield was 37.8% over HY-3, while the maximum HMF yield was 69.2% over HY-1 in the conversion of fructose in GBL-water solvent. In addition, the etherification of HMF was the main factor for the low HMF yield and carbon balance in fructose conversion in GBL-water solvent.
研究领域:
化学工程
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生物质转化
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产品关联
DOI
高影响因子
Molecular Catalysis
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2022
·
IF 5.089
Huiying Wang,Xiangwen Zhang,Guozhu Li
In this work, a tricyclic fuel possessing high energy density and low freezing point has been synthesized via directional alkylation of naphthalene with cyclohexene. A hierarchical HY zeolite with well-defined micro/mesoporous framework was prepared by an alkali-treatment method to efficiently catalyze the reaction. Both porosity and acidity of HY zeolite were optimized by tuning NaOH concentration to maintain the active acid sites and increase their accessibility. The optimally hierarchical HY catalyst (0.5 HY) exhibited higher catalytic activity and good recycling stability. As a result, the tricyclic fuel was produced in high yield, which possesses an energy density of 42.38 MJ/L and a freezing point of < -75 °C. This work provides a straightforward reaction route and an efficient catalyst for the production of a high energy density tricyclic fuel using readily available raw materials.
研究领域:
化学工程
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2022
·
IF 8.129
Jiayao Qi,Yanni Guo,Hanqiong Jia,Binbin Fan,Hang Gao,Bo Qin,Jinghong Ma,Yanze Du,Ruifeng Li
The commercial Y zeolites are widely used in catalytic cracking and hydrocracking in industry, the efficient hydrocracking of polycyclic aromatics is a challenging task in petroleum and coal refining. The acidic zeolite in the hydrocracking bi-functional catalyst dominates largely the product selectivity, so understanding the independent effect of acid sites is favorable to the design of the catalyst. Herein, five industrial HY zeolites with different ratios of Si/Al were applied to tetralin hydrocracking to produce high-value benzene, toluene, and xylenes (BTX) in a high-pressure fixed bed reactor . The result indicated that mesoporous HUSY not only improved the catalytic activity but also exhibited longer-term stability compared with micropore HY. Interestingly, tetralin conversion in the hydrocracking showed a high-similar value when the Si/Al ratio of the zeolites is above 26 with almost identical porous structure , regardless of the distribution of acidity. And the yield of products is associated with the acidity of the HY zeolites, the lower the Si/Al ratio is, the more favorable the monocyclic aromatic hydrocarbons form. Therefore, it is beneficial for the industrial process to reduce the zeolite post-treatment procedure which achieves the high activity and BTX yield in the hydrocracking of tetralin and to abate the cost consumption, although it is still impractical to get rid of the trial-error scheme for the designing of an efficient catalyst in practice.
研究领域:
催化化学
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石油加工工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Yuehua Xiao,Chengtao Wang,Jiale Xiao,Hangjie Li,Zhengxing Cui,Yeqing Wang,Liang Wang,Feng-Shou Xiao
Oligomerization of alkenes is a promising way for production of high-quality and eco-friendly liquid fuels, where zeolite catalysts are critical. In the zeolite catalysts, mass transfer and accessibility in the reaction are normally influenced by intrinsic micropores of zeolites, in particular, bulky or branched molecules are employed. Here, we report isoamylene (2-methyl-2-butene) dimerization over mesoporous HY zeolites obtained by facile NaOH treatments. These mesoporous HY zeolites exhibited high activity and good stability for the isoamylene dimerization compared with untreated HY zeolite. Powder XRD patterns, N2 physisorption, SEM, TEM, NMR, FTIR, and NH3-TPD techniques were used to characterize the porosity and acidity of the zeolites. These results showed that mass transfer and accessibility to the acid sites of the guest molecules are the key factors for the improvement of catalytic performances.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
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2023
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IF 5.3
Yuxiang Mao,Jun Cheng,Hao Guo,Lei Qian,Weijuan Yang,Ji-Yeon Park
To improve Co-LDH nanosheet utilization in catalytic conversion of microalgal lipids to biodiesel, an efficient bifunctional catalyst with synergetic acid and base sites was synthesized by in situ growth of Co-LDH nanosheets on HY zeolite. The bifunctional catalyst with a molar ratio of Co-LDH nanosheets to HY zeolite at 4 exhibited synergistic catalysis of acid sites in the HY zeolite and base sites Co(OH)x (x = 2, 3) in the Co-LDH nanosheets, which promoted esterification of free fatty acids and transesterification of triglycerides in microalgal lipids. Co-LDH nanosheets were dispersed on the HY zeolite surface through generated Si–O–Co bonds to enhance Co(OH)x (x = 2, 3) utilization, while the specific surface area of the catalyst increased from 107.9 m2/g (Co-LDH) to 272.5 m2/g. Therefore, the optimal catalyst promoted conversion efficiency from 87.8 to 96.1%, and the conversion efficiency remained at 87.6% after six reusability cycles.
研究领域:
催化化学
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可再生能源
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2018
·Vol. 96
·期 12
·2586-2592
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IF 1.265
Renjie Deng,Kuiyi You,Fangfang Zhao,Pingle Liu,He'an Luo
In this work, a simple method for the highly selective preparation of valuable dinitronaphthalene from 1-nitronaphthalene employing NO 2 as a nitrating agent has been developed. The results demonstrated that HY zeolite as an eco-friendly and stable catalyst exhibits good catalytic performances. The total selectivity to valuable dinitronaphthalene compounds including 1,5-, 1,4-, and 1,3-dinitronaphthalene can reach 87.6 % in our present nitration reaction. Meanwhile, the physico-chemical properties of catalysts were characterized by XRD, FTIR, TG/DTG, BET, and NH 3 -TPD, and the probable nitration reaction mechanism was also suggested in this paper. The present nitration process seems to be a mild, eco-friendly, and economical route for the preparation of valuable dinitronaphthalene compounds.
研究领域:
化学工程
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催化
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环境化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Zhiheng Wang,Yanyan Liu,Xin Li,Ruiyao Gao,Jiong Sun,Jiankun Liu,Songdong Yao
This study utilized the swelling properties of superabsorbent polymers (SAP) to adsorb zeolite sols and slurries to construct C-HY composites. The synthesized C-HY composites proved to be effective supports for NiMo catalysts in the hydrodesulfurization (HDS) of dibenzothiophene ( DBT ) and 4,6-dimethyl-dibenzothiophene (4,6-DMDBT). XRD , BET, SEM, TG, NH 3 -TPD, FTIR, H 2 -TPR, TEM and XPS were used to characterization the texutural structure, acidity and metal distribution of prepared NiMo/C-HY catalysts. By combining zeolite slurries with SAPs, HY can be efficiently incorporated into carbon substrate structure in three dimensions (3D), thereby changing the structural characteristics, morphology, acidity, and metal distribution of HDS catalysts. The conversion of DBT decreases sequentially: NiMo/C-HY-s > NiMo/C-HY-h > NiMo/C-HY-p > NiMo/C-HY-c, and the conversion of 4,6-DMDBT decreased sequentially: NiMo/C-HY-s > NiMo/C-HY-p > NiMo/C-HY-h ≫ NiMo/C-HY-c. The introduction of HY into the carbon support can increase the HDS reaction rate of NiMo/C by more than 1.2–1.5 times. The intrinsic reaction activity of NiMo/C-HY-s can even exceed that of traditional NiMo/Al 2 O 3 catalysts. Based on the same Mo loading amount, the HDS activity of NiMo/C-HY-s is twice that of NiMo/Al 2 O 3 in DBT HDS and 1.1–1.5 times that of NiMo/Al 2 O 3 in 4,6-DMDBT HDS. It is thought that HY in carbon composites promotes C–S bond cleavage of sulfur-containing molecules in DBT HDS. The unique dispersion of Mo species induced by HY favors the formation of highly stacked NiMoS active phases, which may be the crucial in 4,6-DMDBT HDS.
研究领域:
催化化学
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材料科学
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能源化工
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Changhui Zhu,Haiyong Wang,Chilu Cai,Kang Bi,Bijuan Cai,Xiangbo Song,Qiying Liu,Longlong Ma
Biomass-derived 2,5-dimethylfuran (DMF) is an ideal, renewable gasoline additive, and its production with high productivity is highly desirable. A continuous production route was developed to yield DMF from fructose via a tandem strategy, where dehydration catalysts (HY zeolite and niobium phosphate) assisted by 1-butyl-3-methylimidazolium chloride ([BMim]Cl) and hydrodeoxygenation (HDO) catalyst Cu–Ru/C were integrated into one reaction system with γ-butyrolactone (GBL) as the mobile phase. Optimum conditions, such as temperature, H2 pressure, weight hourly space velocity, and [BMim]Cl concentration, were investigated systematically, with an initial HDO study by using 5-hydroxymethylfurfural (HMF) as substrate and subsequent tandem dehydration and HDO to produce DMF with fructose as substrate. Among the conditions, the highest yield of DMF at 55.2% was gained by niobium phosphate and Cu–Ru/C, with the aid of [BMim]Cl in a fixed bed. Meanwhile, [BMim]Cl facilitated fructose dehydration to HMF and also mediated HDO of the resultant HMF by stabilization, which was clarified by 1H NMR and FTIR spectroscopy. Finally, the fact that carbon deposit led to catalyst deactivation was examined thoroughly via a series of characterization techniques. This work achieved continuous DMF production from fructose and laid a foundation for future possible amplification of DMF.
研究领域:
化学工程
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催化
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可再生能源
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生物燃料
✓ 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）