CATALYSIS SURVEYS FROM ASIA
·
2020
·Vol. 24
·期 2
·104-114
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IF 2.194
Yang Lijuan,Song Zhaoyang,Yu Yingmin,Zhu Lijun,Xia Daohong
A novel bimetallic bifunctional Pt–NiP/Hβ isomerization catalyst was successfully prepared by introducing a small amount of noble metal Pt into the NiP on the Hβ carrier. The catalyst demonstrated superior catalytic activity to Pt/Hβ and NiP/Hβ catalysts for n -hexane isomerization, due to the good surface property, the synergistic effect of the two metals, the suitable match between acid site and metal site, as well as good reduction stability. The effects of Pt loading and NiP addition amount on the surface property were studied comprehensively through a series of characterization, and the correlation among surface property with catalytic behavior was also analyzed. The results indicated that the Pt (0.1 mol%)–NiP (10 mol%)/Hβ catalyst had good structural characters, surface acid property and an uniform distribution of NiP and Pt active components on surface, which is helpful to obtain a highly efficient catalytic performance. Additionally, the influence of reduction/reaction conditions on the catalytic activity, as well as the catalyst tolerance to water and thiophene sulfur, was investigated furtherly.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 18
·14799-14808
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IF 3.289
Ximing Yan,Ming Ke,Zhaozheng Song,Qingzhe Jiang,Pei Yu
Lanthanum ion exchange, low-temperature steam treatment and La/steam combined modification were used to modify Hβ zeolite, and then comparative studies were performed on the influences of single and compound modified methods on the etherification activity. XRD, XRF, BET, FETEM-EDS, FTIR, OH-FTIR, NH3-TPD and Py-IR analysis methods were used to characterize the catalysts. The evaluation results show that the best modification method is lanthanum ion exchange followed by low-temperature steam treatment; the highest conversion of isoamylene was 67.72% and the yield of TAME was 65.63%. The characterization results implied that large pore sizes, high acidity, moderate acid strength and a suitable Brønsted acid proportion are all favourable for etherification.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yujia He,Rui Zhang,Weipeng Song,Huai Liu,Junhua Zhang,Wenlong Jia,Lincai Peng
The simultaneous valorization of biomass-based C5 and C6 sugars to furfural, a versatile intermediate, is of great significance to fully utilize biomass components. Inability to effectively transform C6 sugars remains a major barrier toward this challenging goal. We herein report the 1,4-dioxane-mediated solvent system with Hβ zeolite catalyst for the transformation of glucose giving high yield to furfural (57%). The maintenance of intrinsic balanced Lewis and Brønsted acid sites from Hβ zeolite that is credited to the positive solvent effect of 1,4-dioxane is highly conductive to the selective C-C bond cleavage of glucose. Also importantly, the introduction of proper amount of H 2 O into the reaction system results in a high formation rate and an improved selectivity toward furfural due to the induction of highly reactive acyclic glucose. Glucose-to-furfural through 3-deoxyglucose should be more favorable than that via fructose. Impressively, the developed protocol can also be adapted to C5 sugars dehydration, and the one-pot conversion of glucose and xylose mixtures gains a furfural yield as high as 63%. The activation energy barrier for furfural production is higher from glucose compared to xylose. This work not only develops a promising protocol for furfural production simultaneously from C5 and C6 sugars but also provides insights into the mechanistic role of the solvent 1,4-dioxane to availably manipulate the acid-catalyzed conversion of C6 sugars.
研究领域:
生物化学
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催化化学
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Zhu Lijun,Huang Guosheng,Liu Shuo,Jing Xiaohui,Yang Junwei,Xia Daohong
Isoalkanes are ideal gasoline components, and the isomerization reaction of light alkanes is the most effective way to increase the octane number of gasoline. Non-precious metal/zeolite catalysts are the mainstream bifunctional catalysts for alkane isomerization reactions, but there are still challenges in achieving high octane number components—multi-branched isoalkanes in isomerization reactions. In this article, Ni–heteropoly acid/zeolite alkane isomerization catalyst (Ni–HTA/Hβ) was prepared by impregnation method. Under optimized conditions, the conversion rate of n -hexane was 79.5%, the yield of isoalkanes was 78.7%, and the selectivity of isoalkanes was as high as 99.0%. In the product distribution, the Ni–HTA/Hβ catalyst can obtain more multi-branched isoalkanes, namely, 2,2-dimethylbutane and 2,3-dimethylbutane, with a total content of up to 19.2%, achieving the goal of further improving the yield of double-branched alkanes in C 6 alkane isomerization products.
研究领域:
催化化学
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石油炼制
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材料化学
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工业化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yang Peng,Zhanwei Xu,Le Yu,Xucheng Li,Weiran Yang
The direct conversion of furfural (FUR) to 2-methyltetrahydrofuran (2-MTHF) was investigated over a trimetallic CuNiRe/Hβ catalyst. Under optimal reaction conditions at 240 °C under 3 MPa H 2 for 1 h, almost complete conversion of FUR and high-yield of 2-MTHF (81 %) was achieved. This is the highest yield reported for the direct conversion of FUR to 2-MTHF. HR-TEM demonstrated that the growth of Cu nanoparticles (NPs) on the surface of Hβ was inhibited after loading Ni or Re resulted in the smaller Cu particle size and better hydrogenation and hydrodeoxygenation activity. H 2 -TPR characterization exhibited that the reducibility of bimetallic and trimetallic catalysts was higher than that of monometallic catalysts·NH 3 -TPD explained that Hβ acid sites mainly contributed to FUR deoxygenation. The adsorption configurations of FUR, furfuryl alcohol (FOL) and 2-methylfuran (2-MF) on the catalyst were revealed by ATR-IR. Catalyst evaluation and control experiments proved that FUR was first hydrogenated to FOL, followed by hydrodeoxygenation to 2-MF, and finally hydrogenated to 2-MTHF catalyzed by the combination of three metals.
研究领域:
催化化学
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可再生化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2024
·
IF 2.5
Xue Changhao,Hou Xiaohui,Sun Weijie,Yuan Xia
The acidic molecular sieve carrier Hβ supported non-noble metal catalyst Ni/Hβ was prepared by equal volume impregnation method and applied to the hydroalkylation of benzene to cyclohexylbenzene. The effects of calcination procedures on the particle size of Ni and the dispersion degree of metal on the carrier were investigated. Compared with the samples reduced by hydrogen after calcination, the active site Ni of Ni/Hβ obtained by direct thermal reduction in hydrogen is mainly dispersed on the surface of the carrier, with better metal dispersion and smaller particle size of Ni. Under the optimized reaction conditions, the initial pressure of H 2 is 2.5 MPa, the amount of catalyst is 4% of the total reaction liquid, and at the reaction temperature 190 °C for 3 h, the conversion of benzene is 38.4%, the selectivity of cyclohexylbenzene is 72.8%, the selectivity of cyclohexane is 5.2%, the selectivity of dicyclohexylbenzene is 16.5%, and the selectivity of other by-products decreased to 5.5%. After the catalyst was reused for 5 times, the conversion of benzene and selectivity of cyclohexylbenzene were both have a slight decrease. Characterization results showed that the structure of the recovered catalyst was stable, but the specific surface area and pore volume decreased significantly, the resulted problem of catalyst pore blockage can be restored through calcination treatment.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Zong-Pin Fu,Qi-Jie Zhou,Yun-Peng Zhao,Yu-Fa Wu,Fang-Jing Liu,Mei Zhong,Jian Li,Jing Liang,Jing-Pei Cao
The high oxygen content and low calorific value of bio-oil make it unsuitable for direct production of high energy density fuels. To address this issue, the C-O-C, C-O-H, and C-C bonds in the oxygenated compounds of bio-oil can be modified through hydrodeoxygenation (HDO) reaction. In this study, we synthesized a series of efficient Ni-CoOx/Hβ-u catalysts by impregnating Hβ molecular sieve modified with urea under mild conditions. The catalytic HDO performance of these catalysts was evaluated using guaiacol and dealkalized lignin oil as substrates. The results indicate that the Ni-15CoOx/Hβ-u catalyst demonstrated superior activity. The suitable specific surface area and pore volume of the Ni-15CoOx/Hβ-u catalysts, as well as uniformly dispersed metal particles on their surface, increased the number of active sites available for HDO. Additionally, the presence of defective sites on the CoOx surface and acidic sites on the catalyst facilitate the breaking of intermediate C-O bonds (deoxygenation) and dehydration reactions. Utilizing the Ni-15CoOx/Hβ-u catalysts, guaiacol was completely converted to cyclohexane with 100% selectivity (at 180 °C, 1.0 MPa H 2 , 40 min). Furthermore, the phenolic compounds in bio-oil could also be transformed into cycloalkanes via the HDO process. These findings suggest that the Ni-15CoOx/Hβ-u catalyst has the potential to effectively hydrodeoxygenate bio-oil under mild reaction conditions.
研究领域:
能源化学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Congcong Ji,Hongyu Wang,Shiqin Sun,Qi Li,Ji-Jun Zou,Shitao Yu,Huibing Shi,Genkuo Nie,Shiwei Liu
2-Ethylanthraquinone is frequently used for producing bulk consuming chemicals. However, the synthesis of 2-ethylanthraquinone is still restricted by expensive raw materials, complex preparation process and poor-cycling catalyst. Herein, a one-pot method is developed to synthesize 2-ethylanthraquinone using phthalic anhydride and ethylbenzene as feedstock by combination of acylation and dehydration over a Sc-modified Hβ catalyst. Sc-modified Hβ was prepared via impregnation and catalyzed conversion of phthalic anhydride about 58.8% and 2-ethylanthraquinone selectivity up to 78.5% which is better than the results by other metals-modified Hβ zeolites. By adjusting Sc loading amount in Hβ, more acids are created especially strong Lewis acid and an appropriate synergistic effect of Lewis/Bronsted acids is obtained for cascade reactions of acylation and dehydration. Then, the reaction conditions were investigated and the catalyst can be reused in 4 runs. This work provides a green and simple way for 2-ethylanthraquinone synthesis.
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
Molecular Catalysis
·
2025
·
IF 4.9
Qian Li,Liang Gao,Hao Zou,Yibin Luo,Xingtian Shu,Hao Wang
The dehydration-Prins condensation of tert‑butanol (TBA) and paraformaldehyde to produce 4,4-dimethyl-1,3-dioxane (DMD) was investigated using Hβ zeolites with a controlled Si/Al ratio. The acidic properties, including type, strength, and density, were systematically characterized, revealing that both total acid density and weak Brønsted acid density critically govern DMD selectivity. Specifically, reducing the weak Brønsted acid density from 204.91 to 92.94 μmol/g resulted in an 18 % decrease in DMD selectivity. Reaction pathway analysis identified the dehydration of TBA to isobutene as the key initial step. Furthermore, the introduction of extra-framework aluminum species enhanced the Lewis acid density and the Brønsted-to-Lewis (B/L) acid ratio. TBA dehydration experiments confirmed that Lewis acids originating from extra-framework aluminum significantly promote this critical step. Under the optimized conditions of 125 °C, 3.0 MPa, 0.417 mol of paraformaldehyde, 0.208 mol of TBA, 20 wt % H 2 O, and 1.7 wt % Hβ22, the conversion of TBA reached 59.1 %, the selectivity for DMD was 57.3 %, and the main by-product was identified as an over-condensation product with a 1,3-dioxane structure.
研究领域:
催化化学
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有机化学
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物理化学
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材料科学
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化学反应工程
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 8
·4756-4767
·
IF 2.3
Liu Kande,Wang Sitan,Zheng Lishan,Lou Shifeng,Meng Xuan,Cao Fahai,Liu Naiwang,Shi Li
The catalytic performance of Hβ zeolite treated with different concentration of NaOH on the alkylation of tert-butanol with phenol was studied. The effect of NaOH concentration on the crystallinity, morphology, textural property and acidity of Hβ zeolite was studied by X-ray diffraction (XRD), scanning electron microscope characterization (SEM), N 2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR) and pyridine adsorption infrared spectra (Py-IR) techniques. A certain concentration of NaOH treatment can regulate the pore structure of Hβ zeolite and remove part of framework aluminum and framework silicon, thus achieving the purpose of regulating the pore structure and acidity of the catalyst. Though lower Bronsted to Lewis acid amount ratio when treated NaOH concentrations were 0.15 mol/L, leading to the increasing of selectivity to 4-TBP. The Hβ-0.2 M showed the high selectivity of 90.21% for synthesis of 4-tert-butyl-phenol (4-TBP), compared with the unmodified parent zeolite, the selectivity of 4-TBP improved 16.7%. Graphical Abstract
研究领域:
催化化学
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材料科学
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 43
·期 3
·1557-1574
·
IF 1.833
Xiong Yuannan,Chen Wenqi,Zeng Aiwu
The liquid phase acylation of 2-methylfuran with acetic anhydride over modified Hβ zeolite was first conducted in a continuous flow reactor. The deactivation of Hβ zeolites was attributed to strong adsorption of reactants or products and was verified by GC–MS and 13 C MAS NMR. Deactivated zeolites can be regenerated to their original state by calcination. The acidic properties was adjusted by surface modification on Hβ, the maximum yield of 89.5 mol% and selectivity of 100 % were obtained over tartaric acid modified by Hβ. The deposition of tetraethoxysilane to silica on Hβ contributed to enhancing the catalytic stability. Combined with the results of NH 3 -TPD and Py-FTIR, the amount of Broensted acids played a major role on catalytic activity. A close relationship between the catalytic stability and the ratio of the amount of strong to weak acids at 1:1 was highlighted here. The solvents' effect on the catalytic performances was examined, and 1,2-dichloroethane with moderate polarity exerted a positive effect on catalytic stability.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
ChemCatChem
·
2014
·Vol. 6
·期 12
·3482-3492
·
IF 5.044
Liangguang Chen,Junying Fu,Lingmei Yang,Zibo Chen,Zhenhong Yuan,Pengmei Lv
Graphical Ni wanna live forever: A Ni/Hβ zeolite catalyst is applied to the hydrotreatment of fatty acid methyl esters (FAMEs). The metallic and acidic functionalities of Ni/Hβ zeolite catalysts show a synergy in hydrodeoxygenation, which proceeds without carbon loss and with high FAME conversions and yields of liquid C 16 and C 18 alkanes. The reaction scheme of the whole FAME transformation is investigated by using a batch reactor. A Ni/Hβ zeolite catalyst was prepared for the selective transformation of fatty acid methyl esters (FAMEs) into diesel-like alkanes through hydrotreatment. Characterization of the physicochemical properties of a 10 wt % nickel-loaded, Hβ zeolite support indicated that nickel(II) oxide aggregated into large particles approximately 23.9 nm in size, whereas nickel aggregated into particles 18.3 nm in size, significantly increasing the total acid sites of Hβ zeolite after hydrogen reduction. The reaction scheme of the whole FAME transformation was investigated by using a batch reactor. It was found that FAMEs were first hydrogenated mainly to saturated fatty acids, followed by hydrodeoxygenation without carbon loss, the main route toward alkanes. The hydrotreatment of FAMEs by decarboxylation or decarbonylation was favored at high temperatures and low hydrogen pressures on Hβ zeolite with higher nickel loadings. The metallic and acidic functionalities of nickel/Hβ zeolite catalysts exhibited a synergistic effect in hydrodeoxygenation without carbon loss, achieving high FAME conversion and yields of liquid C 16 and C 18 alkanes. Optimal catalytic performances were obtained with 10 wt % nickel loading over Hβ zeolite (Si/Al=25) at 270 °C with a pressure of 1.0 MPa H 2 over 8 h. A maximum alkane product yield of 93.2 % was achieved for C 15 –C 18 alkanes with complete FAME conversion. 80.3 % FAME conversion could was achieved after eight reaction cycles by using the nickel/Hβ zeolite catalyst with calcination after every use.
研究领域:
催化化学
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可再生能源
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绿色化学
✓ 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）