JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2025
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IF 6.2
Wanchen Zhu,Zhongyang Luo,Feiting Miao,Longyi Liu
Biomass hydropyrolysis vapor upgrading (HPVU) is a promising approach for biofuel production, where metallic catalysts play a key role in oxygen removal and aromatic hydrocarbon formation. In this study, Pd/HZSM-5 and Mo/γAl 2 O 3 catalysts were prepared and utilized individually or in combination to investigate their effects on poplar HPVU in a continuous-flow reactor. Meanwhile, the influence of upgrading temperature on hydrodeoxygenation (HDO) reactions was studied. At an upgrading temperature of 400 ℃, combination of Pd/HZSM-5 and Mo/γAl₂O₃ resulted in an organic phase yield of 9.19 wt%. The mass yield and selectivity of aromatic hydrocarbons reached 8.13 wt% and 93.4 %, respectively, with selectivity of C8 + monocyclic aromatic hydrocarbons accounting for 56.7 %. The overall mass balance was 96.2 %. The presence of Pd promotes hydrogenation and hydroalkylation reactions, while Mo/γAl₂O₃ enhances deoxygenation. Additionally, its mesoporous structure facilitates reactant diffusion. The density functional theory calculations confirmed that Pd could efficiently activate H 2 and thus provide hydrogen radicals for HDO on Mo/γAl₂O₃ surface, which revealed the synergistic effect of these two catalysts. This study highlights that noble-metal catalyst aided by oxophilic metal catalyst can make a significant contribution to biomass HPVU.
研究领域:
能源与催化
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化学工程
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2012
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IF 4.98
Yan Zhao,Yao Fu,Qing-Xiang Guo
In the present study, γ-valerolactone (GVL) is firstly reported to be converted into aromatic hydrocarbons through catalytic pyrolysis . The catalysts and reaction conditions are both critical in maximizing the hydrocarbon selectivity . Four zeolites , i.e. MCM-41, β-zeolite, ZSM-5 and HZSM-5 were tested in this work, among which HZSM-5 (Si/Al = 25) was found to be the most effective catalyst in both reactivity and selectivity. Under the reaction temperature of 500 °C, the highest carbon yield of 56.71% of aromatics was achieved from GVL with HZSM-5 (Si/Al = 25) as catalyst. Moreover, the HZSM-5 catalyst was recycled for five times without significant decrease in product selectivity.
研究领域:
能源与燃料
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化学工程
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Yiting Lei,Yulong Ma,Yonggang Sun,Liqiong Wang,Yingbo Zhu,Jinpeng Wei,Bolong Zhao,Li Zhu
Lignin, as a kind of biomacromolecule, plays a crucial role in the development of renewable energy sources. However, achieving excellent catalytic efficiency and selectivity towards expected products over a single catalytic system remains a significant challenge. The adjustment of acidic sites is an effective strategy to enhance hydrodeoxygenation (HDO) activity and product selectivity. This strategy facilitates charge transfer and activates substrate migration with the catalyst. Therefore, it is necessary to understand the relationship between the structure and activity of acid sites in catalysts, and construct synergistic Brønsted-Lewis sites. In this study, the incorporation of Ni@NC active phase derived from metal-organic frameworks (MOFs) significantly enhanced both the strength and quantity of Lewis acid sites (LASs) in the Ni@NC-HZSM-5 composite catalyst. This enhancement facilitated the cleavage of C Ar –OCH 3 bonds in lignin oil. Furthermore, the abundant Brønsted acid sites (BASs) present in HZSM-5 markedly promoted the cleavage of C Ar –OH bonds. Efficient conversion of real lignin oil was achieved through the synergistic action of the dual-acid sites, resulting in the conversion of 98.50 % and the C 6+ cycloalkane selectivity of 95.05 %. This study proposed a novel approach to the efficient upgrading of lignin-based bio-oil into alternative fuels using heterogeneous catalysts.
研究领域:
生物化学
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催化化学
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DOI
PubMed
高影响因子
LANGMUIR
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2024
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IF 3.7
Renjie Deng,Yiming She,Botao Cao,Lele Huang,Junjie Zhu,Huajie Liu,Haishuai Cui,Yao Tian,Fangfang Zhao
Zeolites are used in the field of toluene nitrification reactions, but their intrinsic mechanism is not well explained. In this work, three typical zeolites including HZSM-5, HY, and Hβ are selected as catalysts and used for the nitration of toluene and typical monosubstituted benzenes with NO2, and it explores the intrinsic influences on the nitrification of toluene on various zeolites through experimental and theoretical methods. The acidic properties and pore structures of three different zeolites were investigated through appropriate characterization techniques. Hβ zeolite exhibited the highest catalytic performance among the three zeolites, attributable to its unique pore structure and acidic properties. The theoretical analysis of various zeolites indicates that the Hβ zeolite can effectively reduce the activation energy barrier, thereby significantly enhancing the transfer nitration performance. The theoretical calculations also suggest that the para-nitration product is more readily formed within the pores of Hβ zeolite, resulting in high para-selectivity. This study provides a theoretical basis for the selective catalysis of aromatics on zeolites.
研究领域:
化学工程
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催化科学
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2026
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IF 3.7
Zhaoshuo Ge,Lixia Bao,Yangping Lv,Yiheng Wu,Daxin Shi,Qi Liu,Qin Wu,Kangcheng Chen,Guiyuan Jiang,Hansheng Li,Yaoyuan Zhang
Light alkane aromatization represents a pivotal catalytic process for valorizing abundant light alkanes into high-value aromatics, holding significant industrial promise. Herein, a series of Ga-HZSM-5 catalysts were synthesized by the hydrothermal method. The effects of Ga content and Si/Al ratio on the catalytic performance of propane aromatization over Ga-HZSM-5 were investigated to discern the structure-activity relationship, reaction pathway, and coke formation. The optimized 1%Ga-HZSM-5(50) catalyst exhibited superior performance, with propane conversion and BTX formation showing a volcano-shaped trend with increasing Ga content. Conversely, for a fixed Ga loading, aromatization performance was enhanced with decreasing Si/Al ratio, with 1%Ga-HZSM-5(25) delivering the highest aromatization activity. A positive correlation was identified between catalytic activity and Lewis acid density, underscoring the role of Lewis sites in facilitating propane dehydrogenation and subsequent BTX formation. Furthermore, TG and TPO analyses revealed that the deposited coke in Ga-HZSM-5 was predominantly highly graphitized, which could not be removed by the air-regeneration treatment under reaction temperature.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Boxuan Yang,Zheng Zhang,Chen Tian,Wenjing Yuan,Zhongqiu Hua,Shurui Fan,Yi Wu,Xuemin Tian
Gas sensors based on Pd-loaded SnO 2 were prepared with printed zeolite films on the top of the sensor layer to enhance selective response to methane. As expected, Pd-loaded SnO 2 has a sensitive response to CH 4 and VOCs, such as ethanol and acetone vapors. Pt catalyst was dispersed onto the surface to promote the catalytic activity of zeolite. According to the catalytic characterizations, it was indicated that interfered gases, CO and ethanol were catalytically oxidized into CO 2 and water vapor. Whereas the catalytic combustion of methane is a negligible and sensitive response to the interested analyte was significantly promoted. Thus, the selective response to CH 4 was greatly improved even in a mixture of CO and VOCs. Based on the power-law response to oxygen, it was found that the resistive responses of all sensors were highly oxygen-dependent, suggesting that oxygen adsorbates on the surface were involved in the sensing process and no difference with zeolite coated sensors. Thus, it can be concluded that zeolite films printed onto the sensing layer surface serve as a catalytic filter and responsible for the enhanced sensitive and selective response of methane.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2020
·Vol. 96
·期 1
·256-263
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IF 2.008
Guo Lulu,Wang Zhichang,Wang Jianfeng,Wang Zheng,Xue Shaozong,Jiang Xinge,Lu Tianliang,Xu Jun,Zhan Yuzhong,Han Li
c -Axis-oriented HZSM-5 zeolites were directly synthesized by introducing crosslinked polyacrylamide (C-PAM) hydrogels into ZSM-5 synthesis gels. The growth orientation of the crystals as well as the acidity of ZSM-5 could be modulated by the C-PAM content in the synthesis gel. The crystal growth along the a -axis and b -axis was obviously restricted, whereas c -axis growth was distinctly promoted with increasing C-PAM content, which was probably due to the C-PAM having stronger interactions with the {010} and {100} facets than the {101} facet. Sample Z-2, which was prepared with 2% C-PAM exhibited the shortest b -axis length elongated prism structure and strong acid sites. Furthermore, Z-2 exhibited excellent catalytic performance in the methanol-to-olefin (MTO) reaction showing the highest methanol conversion (100%) and the light olefin selectivity (TOS) (81.2%), as well as the longest lifetime (>23 h).
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高影响因子
CHINESE JOURNAL OF CATALYSIS
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2014
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IF 1.552
Shurong Wang,Qinjie Cai,Xiangyu Wang,Li Zhang,Yurong Wang,Zhongyang Luo
Acids and ketones in biomass pyrolysis oil (bio-oil) can be readily cracked to produce hydrocarbons. They can also be enriched in the distilled fraction using molecular distillation techniques. To simulate the actual composition of the distilled fraction, the co-cracking performance of mixtures of hydroxypropanone, cyclopentanone, and acetic acid with ethanol in a fixed-bed reactor over an HZSM-5 catalyst was studied. The influences of reaction temperature and pressure on the reactant conversion, selectivity, and composition of the oil phase were investigated. At a low reaction temperature of 340 °C, the conversions of acetic acid and ethanol were as low as 67.9% and 74.4%, respectively, and the oil phase had a low hydrocarbon content of 59.8%, with large amounts of oxygenated byproducts. Cracking under atmospheric pressure also generated a low-quality oil phase with a very low selectivity of only 10.8%. Increasing the reaction temperature promoted reactant conversion and improved the deoxygenation efficiency, whereas increasing the reaction pressure significantly promoted hydrocarbon production. The optimum conditions for biogasoline production were 400 °C and 2 MPa. Under these conditions, the reactant conversion reached 100% and the oil phase selectivity was 31.5 wt%. This oil phase consisted entirely of hydrocarbons, 91.5 wt% of which were aromatic hydrocarbons , indicating that the HZSM-5 catalyst had high activity for deoxygenation and aromatization reactions during cracking. In addition, characterization of the spent catalysts and stability tests showed that the catalyst was deactivated after a long reaction time. However, the catalytic activity was recovered by catalyst regeneration.
研究领域:
能源生物学
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催化化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2015
·
IF 4.321
Qian Yao,Lujiang Xu,Zheng Han,Ying Zhang
Furfural, an abundant biomass derived compound, was converted into indoles via thermo-catalytic conversion and ammonization with zeolites. The effect of reaction temperature, catalyst, weight hourly space velocity (WHSV) and ammonia to furfural molar ratio on the product distribution was investigated systematically. They all played important roles on indoles production. The maximal carbon yield of indoles (20.79%) was achieved by using HZSM-5 (Si/Al = 25) catalyst at 650 °C with WHSV as 1.0 h −1 and NH 3 to furfural molar ratio as 2. The HZSM-5 (Si/Al = 25) catalyst was recycled for five times and showed slight deactivation. Three possible aldehyde group of furfural conversion pathways were proposed and one possible reaction pathway from furfural to indoles was verified based on the experimental and quantum calculation results, that is, furfural firstly reacted with ammonia to form furfural-imine, and then furfural-imine underwent a cracking reaction to form furan. Thereafter, furan was converted to pyrrole and finally to indoles.
研究领域:
生物化学
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催化化学
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DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2017
·
IF 3.471
Leilei Dai,Liangliang Fan,Dengle Duan,Roger Ruan,Yunpu Wang,Yuhuan Liu,Yue Zhou,Zhenting Yu,Yuezhen Liu,Lin Jiang
Fast microwave-assisted catalytic pyrolysis (fMACP) of soapstock for hydrocarbon-rich bio-oil using different catalysts was investigated in this study. Effects of catalyst, pyrolysis temperature and catalyst to feed ratio on product fractional yields and chemical composition were studied. Experimental results indicated that the use of catalyst increased the relative content of hydrocarbons and selectivity of aromatics. Moreover, HZSM-5 catalyst enhanced the bio-oil yield. When HZSM-5 zeolite was used as a catalyst, 600 °C was the optimal pyrolysis temperature, which provides the maximum bio-oil yield and high content of hydrocarbons. At the cost of the decrease of bio-oil yield, the increase of catalyst to feed ratio increased the relative content of hydrocarbons from 65.41% to 88.59% and selectivity of aromatics from 5.99% to 29.46%. In addition, the analytical results of bio-char show that bio-char with micropore structure and high contents of the essential plant nutrients and micronutrients can be used as a soil amendment to improve soil productivity.
研究领域:
能源与环境科学
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化学工程
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2013
·
IF 4.75
Yan Zhao,Tao Pan,Yong Zuo,Qing-Xiang Guo,Yao Fu
Catalytic pyrolysis of 5-Hydroxymethylfurfural (HMF) was conducted on a fixed bed reactor at atmospheric pressure. HMF could be converted into aromatic hydrocarbons through catalytic pyrolysis . The catalysts and reaction conditions were both critical in maximizing the aromatic hydrocarbons selectivity . Four catalysts, β-zeolite, HZSM-5, Ga/HZSM and In/HZSM were tested in this study. HZSM-5 (Si/Al = 50) was found to be the most effective catalyst in both reactivity and selectivity among these catalysts. Under the reaction temperature of 600 °C, the highest carbon yield of 48.99% of aromatic hydrocarbons was achieved from catalytic pyrolysis HMF with HZSM-5 (Si/Al = 50) as catalyst. Moreover, the HZSM-5 (Si/Al = 50) catalyst was recycled for five times without shown deactivation of the catalyst.
研究领域:
能源生物学
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催化化学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Baocheng Qiu,Yakun Zhang,Yi Liu,Yi Zhang
The efficient conversion of ethane has become more attractive recently because of the shale gas revolution. Platinum-based catalyst is the most active for direct dehydrogenation of ethane to ethylene, but it always suffers deactivation due to coke deposition and sintering of supported Pt. We have successfully synthesized a Pt-embedded inside HZSM-5 crystal catalyst (Pt@HZSM-5) by hydrothermal synthesis using Pt/SiO 2 as only silicone source, to realize excellent stability during the dehydrogenation of ethane (EDH) to ethylene. Based on various characterization results, including in-situ synchrotron XANES and EXAFS, in situ XPS, operando DRIFTS, as well as 27 Al MAS NMR, the stable Pt species with high electron density on Pt@HZSM-5 avoids the deep dehydrogenation of ethane to form coke, and the surrounding environment of Pt active phase, including newly formed HZSM-5 frameworks and its acidity, contributes to suppressing the aromatization of the formed ethylene. As synergic effects, the Pt@HZSM-5 catalyst realizes excellent stability during 50 h EDH reaction without any regenerations with relatively high ethane conversion under the serve reaction conditions (90% ethane in feed gas, 0.1 MPa, 550 °C). However, the conventional Pt/HZSM-5 catalyst exhibits dynamic transformation of Pt chemical state, particle size, and its surrounding environment, resulting in rapid deactivation induced by much more carbon deposition and aromatization of the formed ethylene.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
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