FUEL
·
2023
·
IF 7.4
Yanhong Wang,Lijiao Fan,Liqun Xiao,Lulu Wang,Dongsheng Shen,Yuyang Long
5-Hydroxymethylfurfural (HMF) has been considered a valuable biomass-derived platform chemical that can be produced by hexose dehydration in the presence of an acid. However, the yield of HMF is always reduced because of side reactions such as rehydration and condensation. In this work, the reactive adsorption process of fructose dehydration to HMF catalyzed by hydrochloric acid under microwave condition was studied. BP2000 has better adsorption capacity than activated carbon (AC) in reactive adsorption, and addition of BP2000 increases the HMF yield. The maximum theoretical yield of HMF was 65 % obtained by adding 39 g L −1 BP2000 and reacting for 4 min at 160 °C under a microwave hydrothermal condition. It was discovered that microwave hydrothermal technology (MHT) could significantly increase efficiency and reduce reaction time. Reactive adsorption could efficiently buffer HMF from side reactions when reaction conditions became severe, thereby increasing the HMF yield. Reactive adsorption provides a more sustainable method for HMF production and separation.
研究领域:
化学工程
·
生物质能
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产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Siqi Lv,Rui Zhang,Yuanping He,Zichuan Ma,Xiaolong Ma
Volatile methyl siloxanes (VMSs), which are converted to silica sediments during biogas burning, are regarded as the most problematic VMSs in existing biogas cleaning systems. However, the majority of methods for VMS removal, including cryogenic condensation, physical absorption, chemical absorption and porous material adsorption have been constrained by these methods' intrinsic drawbacks. Here, we present an alternate method for removing VMS from gas streams that are based on the materials supported by H 2 SO 4 . Simple incipient wetness impregnation was used to create MCM-41-supported H 2 SO 4 (SSA/MCM) materials, which showed high reactive adsorption property for hexamethyldisiloxane (L2) elimination in the temperature range of 80–160 °C with the peak reactivity at 100 °C. With maximum Q B and Q m values of 191.3 and 365.6 mg g −1 , respectively, dynamic adsorption findings showed the significance of altering the intake concentration, gas flow rate, adsorbent mass, relative humidity, as well as H 2 SO 4 loading in determining the L2 removal efficacy. Furthermore, it was established that the L2 reactive adsorption was caused by the polymerization of L2 by supported H 2 SO 4 , which produced the creation of polysiloxane. The findings offer an important foundation for creating a cutting-edge biogas cleaning method.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Qiyu Liu,Liang Zhou,Di Fan,Mingzhao Guan,Qiaozhi Ma,Song Li,Xinping Ouyang,Xueqing Qiu,Wei Fan
Selective saccharification of cellulose into glucose is a critical step for utilization of lignocellulosic biomass. Molten salt hydrates (MSHs) have shown promising performance in selectively converting cellulose into glucose because of the high solubility of cellulose in the solvent. However, the separation of formed glucose from the MSHs is still a grand challenge. To address this issue, we developed a two-step process, where crystalline cellulose is hydrolyzed into short-chain glucan oligomers in MSHs followed by separation and subsequent hydrolysis of the formed oligomers into glucose under mild conditions. The two-step method provides an easy separation for glucan oligomers from the MSHs without sacrificing the selectivity to glucose. Application of the method for crystalline cellulose is, however, limited to a relatively low concentration, 26.2 mg/mL, because of the formation of byproducts in the MSH that facilitate oligomers degradation. In this work, reactive adsorption was employed to in situ remove the byproducts formed during cellulose hydrolysis in the MSH. It was found that hyper-cross-linked polymer (HCP) made from the polymerization of 4-vinylbenzyl chloride and divinylbenzene can selectively adsorb 5-hydroxymethylfurfural (5-HMF) and levulinic acid (LA) while showing negligible sugar adsorption in both water and the MSH. With the reactive adsorption approach, byproducts including 5-HMF and LA were removed from the reaction media under reaction conditions, and their negative effects on oligomer degradation were inhibited. In the presence of the HCP, the obtained glucan oligomer concentration was enhanced from less than 54.2 to 247.1 mg mL–1 when the weight ratio of cellulose was increased to MSH from 1:60 to 1:4, exhibiting an oligomer yield of 69.5%. The HCP can be effectively separated from the reaction media by filtration and regenerated by oxidation with hydrogen peroxide. Application of reactive adsorption with HCP for cellulose hydrolysis in the MSH provides a promising method to produce glucan oligomers and glucose with an improved yield and efficiency.
研究领域:
生物化学
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材料科学
·
可再生能源
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DOI
PubMed
高影响因子
FUEL
·
2021
·
IF 6.609
Lan li,Feng Ju,Yao Sun,Hui Pan,Hao Ling
The Ni/ZnO-Al 2 O 3 -SiO 2 adsorbent is a widely used industrial adsorbent for reactive adsorption desulfurization (RADS) process. Metallic Ni and NiO are assumed as the main RADS active sites, and NiS x is the intermediate phase to transfer sulfur to ZnO. However, NiS x could also be the active center for RADS process. In this work, to conduct the desulfurization activity of NiS x , a novel NiSO 4 /ZnO-Al 2 O 3 -SiO 2 adsorbent was prepared and examined through a serious experimental and theoretical study over the conventional adsorbents. Results showed that NiSO 4 based adsorbents could first self-sulfide to NiS x phases, and then NiS x plays as main active sites for RADS. The NiSO 4 phases improved the direct desulfurization selectivity of dibenzothiophene (DBT). By adjusting the content of nickel, the sulfur removal rate of adsorbent with 3 wt% Ni from NiSO 4 could achieve the same level of adsorbent prepared with 18 wt% Ni from NiO. Moreover, NiSO 4 based adsorbent performs excellent desulfurization activity, and its breakthrough sulfur capacity achieves 122.0 mgS/g. The evolution of Ni species on NiSO 4 adsorbent has been studied, and a desulfurization mechanism that takes both NiO and NiS x as active phases has been carried out. NiO phase mainly promotes the hydrodesulfurization pathway, while NiS x phase prefers the direct desulfurization pathway. Finally, the mechanism of RADS on NiS x and the reaction pathways of DBT are also presented.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2013
·Vol. 59
·期 8
·2966-2976
·
IF 2.493
Jiajun Gao,Xingyu Chen,Nannan Ren,Wenjiao Wu,Chunxi Li,Hong Meng,Yingzhou Lu
Excellent desulfurization is achieved via reactive adsorption using Friedel-Crafts acylation materials, that is, acylating reagents and Lewis acids, such as acetyl chloride (AC) and AlCl 3 , being named as acylation desulfurization (ACDS). For model oil, thiophenic compounds, namely, dibenzothiophene, benzothiophene, and thiophene, are removed completely by AC–AlCl 3 within 30 min at room temperature. In this process, thiophenic compounds are acylated by AC under the catalysis of AlCl 3 , and the acylated derivatives are stronger base than original ones due to incorporation of O-containing carbonyl group (CO) and, thus, adsorbed more easily by AlCl 3 via Lewis acid–base complexation. Further, ACDS mechanism is identified by acylated product characterization and quantum chemistry calculation. Satisfactorily, ACDS is still effective for toluene-rich and real oils, and real oil quality is improved with desulfurization proceeding. © 2013 American Institute of Chemical Engineers AIChE J , 59: 2966–2976, 2013
研究领域:
化学工程
·
石油加工
·
催化化学
✓ 已验证
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 30
·
IF 12.5
Xinxin Li,Weiwei Zhang,Guang Miao,Zhikang Wu,Xingjie Wang,Xuan Wei,Zewei Liu,Hao Tang,Cuiting Yang,Jing Xiao
Separating perfluorinated cyclopropane/propane mixtures is critical yet challenging for sustainably producing high-purity perfluropropane in the advanced electronics industry. Conventional one-step adsorption separation methods lack proper selectivity due to similar molecular sizes and properties. We introduce a tandem reaction-adsorption approach with ultrahigh selectivity and low-pressure uptake. The initial step converts perfluorinated cyclopropane into olefins, enhancing molecular size and polarity differences and enabling efficient sieving using a scalable, stable molecular sieve developed. The method achieves selectivity over two orders of magnitude higher than conventional methods, producing 99.9999% pure perfluropropane at 12.5 liters per kilogram per hour with a 98.8% yield in the fixed beds. The tandem reaction-adsorption methodology introduces an efficient route for separating and purifying industrially challenging gas analogs.
研究领域:
化学工程
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材料科学
·
分离技术
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工业化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 15
·3171
·
IF 4.6
Hongmei Wang,Xiaoxu Zhang,Ziqi Shen,Zichuan Ma
The recovery and abatement of volatile organic compounds (VOCs) have received increasing attention due to their significant environmental and health impacts. Supported sulfonic acid materials have shown great potential in converting aromatic VOCs into their non-volatile derivatives through reactive adsorption. However, the anchoring state of sulfonic acid groups, which is closely related to the properties of the support, greatly affects their performance. In this study, two supported sulfonic acid materials, SZO and SMO, were prepared by treating ZrO2and MgO with chlorosulfonic acid, respectively, to investigate the influence of the support properties on the anchoring state of sulfonic acid groups and their reactive adsorption performance foro-xylene. The supports, adsorbents, and adsorption products were extensively characterized, and the reactivity of SZO and SMO towardso-xylene was systematically compared. The results showed that sulfonic acid groups are anchored on the ZrO2surface through covalent bonding, forming positively charged sulfonic acid sites ([O1.5Zr-O]δ−-SO3Hδ+) with a loading of 3.6 mmol/g. As a result, SZO exhibited excellent removal efficiency (≥91.3%) and high breakthrough adsorption capacity (ranging from 38.59 to 82.07 mg/g) foro-xylene in the temperature range of 130 –150 °C. In contrast, sulfonic acid groups are anchored on the MgO surface via ion-paired bonding, leading to the formation of negatively charged sulfonic acid sites ([O0.5Mg]+:OSO3H−), which prevents their participation in the electrophilic sulfonation reaction witho-xylene molecules. This work provides new insights into tuning and enhancing the performance of supported sulfonic acid materials for the resource-oriented treatment of aromatic VOCs.
研究领域:
环境科学
·
材料化学
·
化学工程
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Yi Yuan,Lijia Huang,Tian C. Zhang,Yuan Wang,Shaojun Yuan
Metal oxide loaded carbon-based materials have attracted extensive attention as promising desulfurizers to solve the problem of H 2 S emission at room temperature . However, low desulfurization capacity, difficult regeneration and high economic cost are the main problems of metal oxide loaded carbon-based desulfurizers, which limit their industrial application. Herein, a novel and low-cost CaCO 3 -ZnO loaded biochar (RCZ) was synthesized by one-step pyrolysis of scrap rice and metal salts for highly efficient H 2 S removal at room-temperature. The optimized RCZ-1-1-1-800 sample showed an excellent H 2 S removal ability of 834.48 mg/g at the reaction temperature of 25 °C, oxygen content of 10%, and relative humidity of 70% as compared to 29.31 mg/g achieved by the inactivated biochar (prepared without activator). Such an RCZ-1-1-1-800 desulfurizer also delivered a high H 2 S removal ability under different desulfurization conditions. The associated desulfurization mechanism of RCZ was the coupling of reactive adsorption and catalytic oxidation with sulfur being the main desulfurization product. Moreover, the as-fabricated RCZ also exhibited a high reusability , retaining about 95% of the initial H 2 S removal capacity after five adsorption/regeneration cycles. This work provides a promising idea for the preparation of low-cost and high-capacity metal oxide- and carbonate-loaded carbon-based desulfurizers.
研究领域:
环境科学
·
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Long-Jiang Wang,Hui-Ling Fan,Ju Shangguan,Eric Croiset,Zhongwei Chen,Hui Wang,Jie Mi
A series of novel zinc oxide–silica composites with three-dimensionally ordered macropores (3DOM) structure were synthesized via colloidal crystal template method and used as sorbents for hydrogen sulfide (H2S) removal at room temperature for the first time. The performances of the prepared sorbents were evaluated by dynamic breakthrough testing. The materials were characterized before and after adsorption using scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). It was found that the composite with 3DOM structure exhibited remarkable desulfurization performance at room temperature and the enhancement of reactive adsorption of hydrogen sulfide was attributed to the unique structure features of 3DOM composites; high surface areas, nanocrystalline ZnO and the well-ordered interconnected macroporous with abundant mesopores. The introduction of silica could be conducive to support the 3DOM structure and the high dispersion of zinc oxide. Moisture in the H2S stream plays a crucial role in the removal process. The effects of Zn/Si ratio and the calcination temperature of 3DOM composites on H2S removal were studied. It demonstrated that the highest content of ZnO could reach up to 73 wt % and the optimum calcination temperature was 500 °C. The multiple adsorption/regeneration cycles showed that the 3DOM ZnO–SiO2 sorbent is stable and the sulfur capacity can still reach 67.4% of that of the fresh sorbent at the fifth cycle. These results indicate that 3DOM ZnO–SiO2 composites will be a promising sorbent for H2S removal at room temperature.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1936-1945
·
IF 3.146
Niu Hui,Feng Yuyu,Ding Jie,Zhang Wei,Hu Chenxing,Zhang Qingxiang,Zhang Chen,Li Cuiqing
This study reports reactive adsorptive dechlorination of hydrocarbon oil over TiO 2 -based metal oxides at the temperatures of 20–150 °C. TiO 2 and a series of TiO 2 -CeO 2 were prepared by precipitation method and characterized by N 2 adsorption, XRD, FT-IR, pyridine-IR, NH 3 -TPD and CO 2 -TPD. The characterization results showed that both the acidity and basicity of the adsorbent had a significant impact on its dechlorination capacity. TiO 2 -U precipitated by urea exhibited higher dechlorination capacity than TiO 2 -A precipitated by ammonia due to the higher surface area, more acid and base amounts of the former. Among various Ti (1− x ) Ce x O 2 (x=0.1, 0.3, 0.5, 0.7, 0.9, 1) oxides, Ti 0.7 Ce 0.3 O 2 and Ti 0.3 Ce 0.7 O 2 bimetallic oxides showed higher dechlorination capacity than TiO 2 -U, and the chlorine removal over Ti 0.7 Ce 0.3 O 2 reached 82.8% after adsorption at 150 °C for 3 h. Mixing 5 wt% of alkali earth metal oxide into Ti 0.7 Ce 0.3 O 2 mechanically enhanced its dechlorination capacity, and the chlorine removal over Ti 0.7 Ce 0.3 O 2 -BaO reached as high as 92.1%. The chlorine removal increased with increasing the adsorption temperature. Ion chromatography and GC-MS analysis revealed that organochlorine compound was converted into Cl − and its corresponding alcohol over the adsorbent at 150 °C. Finally, the mechanism of reactive adsorption dechlorination was proposed.
研究领域:
化学工程
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lan li,Jie Sun,Hao Ling,Feng Ju
NiSO4/ZnO-Al2O3-SiO2 adsorbent, as a novel reactive adsorption desulfurization (RADS)adsorbent, has self-sulfidation ability and high desulfurization performance when treating model fuel. However, the RADS performance of the adsorbent under FCC gasoline feedstock is not well understood. Here, we compare the performance of the adsorbent under FCC gasoline with model fuel to test the effect of the hydrocarbon composition of the feedstock. The complex composition of FCC gasoline makes it sensitive to the nickel loading amount of the adsorbent. Under the influence of specific surface area and pore structure, the adsorbent loaded with 3 wt% nickel shows better desulfurization activity when treating FCC gasoline. As hydrocarbons in FCC gasoline compete with sulfur compounds for active Ni sites, the reaction conditions have been tested and optimized to achieve deep desulfurization while maintaining low olefin loss to ensure the octane number of the product. By experimental tests and characterization, it has been proved that NiSx and NiO acted as active Ni sites of the adsorbent. Based on these observations, the mechanism of RADS of FCC gasoline over NiSO4/ZnO-Al2O3-SiO2 adsorbent has been proposed, which provides theoretical support for the development of new adsorbents and the optimization of RADS process.
研究领域:
化学工程
·
环境科学
·
石油炼制
✓ 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）