CATALYSIS COMMUNICATIONS
·
2016
·
IF 3.389
Xingrui Fu,Yue Liu,Weiyuan Yao,Zhongbiao Wu
The catalytic performances of Pt-Pd/MCM-41 bimetallic catalysts prepared by one-step synthesis method were investigated for total toluene oxidation in this paper. The experimental results demonstrated that Pt-Pd/MCM-41 was of superior catalytic activity comparing to the monometallic Pt/MCM-41 or Pd/MCM-41 catalysts with the same metallic content, yielding an almost 100% conversion at 180 °C. The following characterization results indicated that the bimetallic catalyst possessed a higher surface Pt(0) content and smaller doped metal size owing to the synergistic effect of the two noble metals, resulting in the improvement of oxygen adsorption capacity and the reducibility.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2017
·Vol. 11
·期 5
·414-423
·
IF 0.975
Liu Chenlu,Liao Longfei,Li Zengyong,Liu Ying,Wu Shubin,Zhuang Junping
Mesoporous MCM-41 was amino-functionalized to immobilize cupric (Cu2+) and vanadyl (VO2+) for preparing MCM–NH2–Cu2+ and MCM–NH2–VO2+ co-catalysts. The as-prepared two catalysts had been characterized
by XRD, N2 adsorption–desorption, FT-IR, XPS and TEM. The catalytic performance of MCM–NH2–VO2+ in HMF oxidation could be significantly promoted by using MCM–NH2–Cu2+ as the co-catalysts. Several critical
reaction parameters had been investigated, and it indicated that the highest conversion of 5-hydroxymethylfurfural (HMF) obtained was 98.1% at 110 °C in toluene with an optimal 2,5-diformylfuran (DFF) yield of 61.2%. Particularly, the MCM–NH2–Cu2+ and
MCM–NH2–VO2+ catalyst exhibited great stability and can be reused and showed no significant loss of their catalytic activities.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Weirui Chen,Xukai Li,Yiming Tang,Jialu Zhou,Dan Wu,Yin Wu,Laisheng Li
A flexible catalyst, Fe-Cu-MCM-41, was employed to enhance diclofenac (DCF) mineralization and inhibit bromate formation in catalytic ozonation process. Greater TOC removal was achieved in Fe-Cu-MCM-41/O 3 process (78%) than those in Fe-MCM-41/O 3 (65%), Cu-MCM-41/O 3 (73%) and sole ozonation (42%). But it was interesting that both Cu-MCM-41/O 3 and Fe-MCM-41/O 3 achieved 93% bromate inhibition efficiency, only 71% inhibition efficiency was observed in Fe-Cu-MCM-41/O 3 . Influence of pH, TBA/NaHSO 3 and detection of by-products were conducted to explore the mechanism. By Pyridine adsorption–IR and XPS, a relationship was found among activity of catalysts, Lewis acid sites and electron transfer effect between Fe (II/III) and Cu (I/II). Fe-Cu-MCM-41 promoted ozone decomposition to generate OH, which accounted for enhanced DCF mineralization. The consumption of aqueous O 3 also suppressed the oxidative of Br − and HBrO/Br − . More HBrO/BrO − accumulated in catalytic ozonation process and less bromate generated. Bromate formation in Fe-Cu-MCM-41/O 3 process was sensitive with pH value, the acidic condition was not favor for bromate formation. Both DCF mineralization and bromate inhibition were influenced by surface reaction. Moreover, Fe-Cu-MCM-41 showed excellent catalytic performance in suppressing the accumulation of carboxylic acid, especially for oxalic acid. Nearly no oxalic acid was detected during Fe-Cu-MCM-41/O 3 process.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 52
·31479-31494
·
IF 3.119
Boyu Du,Changzhou Chen,Yang Sun,Ming Yang,Mengtian Yu,Bingyang Liu,Xing Wang,Jinghui Zhou
In this study, effects of catalyst types, reaction temperatures, reaction times, reaction solvents and ultrasound frequencies were carefully investigated to improve the yields and characteristics of various depolymerization products of organosolv lignin. Generally, both catalyst types and ultrasound frequencies played important roles in promoting lignin depolymerization and reducing char yield. In particular, the yield and distribution of phenolic monomer (PM) products were greatly influenced by pore structure and acidity of the catalyst. The optimal reaction condition was got in isopropanol at 310 °C for 6 h with 30% ultrasound frequency and 50% phosphotungstic acid (PTA)/MCM-41 catalyst. The highest yields of PM, bio-oil, liquid fuels and lignin conversion were reached as 8.63 wt%, 86.89 wt%, 95.52 wt% and 98.54 wt%, respectively. The results showed that ultrasound acoustic cavitation could enhance the depolymerization of lignin, thus greatly enhancing production of liquid fuels. Simultaneously, the hydrogen composition and high heating value of various lignin depolymerization products improved, and the oxygen content decreased, indicating that hydrogenation and/or hydrodeoxygenation happened during the depolymerization process. Finally, we also found that the 50% PTA/MCM-41 catalyst had high stability; it could be reused for up to five cycles without loss of catalytic activity.
研究领域:
能源化学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Xiaohong Yao,Jian Zhang,Chao Long
This study explored how the Si/Al ratio in Nb-Mn/MCM-41 catalysts affect toluene degradation via plasma catalysis. Adjusting the Si/Al ratio altered catalyst acidity and redox properties, decreasing the Si/Al ratio led to increased acidity, higher Mn 3+ /Mn 4+ ratio and greater O ads /O lat ratio as indicated by NH 3 -TPD, XPS, and O 2 -TPD analysis. Lower Si/Al (Nb-Mn/M(25)) boosted toluene removal efficiency to 98.2% under dry conditions due to increased oxygen vacancies and acidity. Moderate humidity enhanced conversion, but higher humidity levels proved detrimental, especially for low Si/Al catalysts. At a humidity level of 3.11 vol%, the toluene removal efficiency of Nb-Mn/M(25) exhibited a reduction of 15.3%, while Nb-Mn/M(200) with higher Si/Al ratio decreased only by 3%. Hydrophobic, higher Si/Al catalysts showed better resistance to humidity's negative impact. These findings offered insights into designing efficient catalysts for VOC removal by optimized Si/Al ratio and managing humidity.
研究领域:
环境催化
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材料科学
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化学工程
·
等离子体化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 12
·2125-2131
·
IF 2.942
Chunyan Sun,Feng Zhang,Xiao Wang,Fangqin Cheng
Graphical A composite ammonium molybdophosphate/Al-MCM-41 material is synthesized by a one-pot method with natural clay as the silica and aluminum source. A modified “liquid-phase transport” step allows the use of impure natural clay as the starting material to produce pure product without sedimentation pretreatment. The composite material is effective for the adsorption of cesium ions from brine. Ordered hexagonal mesoporous aluminosilicate matrix (Al-MCM-41) with incorporated ammonium molybdophosphate (AMP) was successfully synthesized by a one-pot synthesis method with natural clay from low-grade potash ores of Qinghai salt lake as the silica and aluminum source. We introduced a modified “liquid-phase transport” step, which allowed the use of impure natural clay as a starting material to directly produce pure product without sedimentation pretreatment. The resultant product was characterized by X-ray fluorescence (XRF) spectroscopy, FTIR spectroscopy, XRD, TEM, 27 Al and 31 P magic-angle spinning (MAS) NMR spectroscopy, and N 2 adsorption/desorption, which indicated that the AMP was immobilized in the mesoporous structure of Al-MCM-41. The adsorption capacity of the final product for the removal of cesium ions in solution was also investigated. The results suggested that salt lake clay is a promising low-cost precursor for the production of mesoporous aluminosilicate supports through one-pot syntheses, and the final composite material is effective for the adsorption of cesium ions from solutions containing other alkali metal ions.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 75
·47539-47546
·
IF 3.108
Song Zhang,Chao Xu,Guoqing Zhai,Mingliang Zhao,Mo Xian,Yuxiang Jia,Zongjiang Yu,Fusheng Liu,Fangfang Jian,Weizhi Sun
A new type of bimetallic palladium and aluminum incorporated mobile crystalline materials (Pd–Al-MCM-41) as bifunctional catalysts has been hydrothermally synthesized. Characterization shows that these molecular materials exhibit an ordered mesoporous structure, high surface area and a good dispersion of palladium in the frame. The catalytic activity of the Pd–Al-MCM-41 for the dimerization–hydrogenation reaction system of β-pinene in one pot has been systematically studied. Pd0.5–Al30-MCM-41 (SiO2/Al2O3 = 30, 0.5 wt% palladium content) was found to be the best catalyst which gave a dimer yield of up to 64.7%. It is worth noting that palladium shows a good synergic catalytic effect with aluminum in the dimerization reaction and enhances the dimerization yield. Furthermore, the bifunctional catalyst displayed a good activity over 4 runs.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Hongxia Zhang,Yahang Mou,Shuhua Liu,Dezhi Han,Fang Wang,Liancheng Bing,Guangjian Wang
Efficient and controllable hydrogen release from ammonia borane (NH 3 BH 3 , AB) hydrolysis is a secure and effective way to generate hydrogen on-demand. The development of high-efficiency and low-cost catalysts is of important but still remains a great challenge. Herein, uniformly dispersed NiPCeO x nanoparticles (NPs) with narrow size distribution supported on mesoporous MCM-41 were prepared by incipient wetness impregnation followed by NaBH 4 reduction. Attributing to the ordered mesoporous structure of the support as well as the efficiently enhancement of electron density on the Ni active sites brought by the electron transfers , the NiPCeO x /MCM-41 catalyst exhibits exceptional catalytic performance towards AB hydrolysis with a high turnover frequency (TOF) value of 47.3 mol H2 (mol Ni ·min) −1 at 298 K and a low apparent activation energy ( Ea ) of 35.86 kJ mol −1 . Furthermore, the NiPCeO x /MCM-41 catalyst shows excellent durability with 76.5% of the initial TOF value remained after five cycles.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2020
·
IF 3.905
Kai Li,Bo Wang,Dana Bolatibieke,Dong-Hong Nan,Zhen-Xi Zhang,Min-Shu Cui,Qiang Lu
Levoglucosenone (LGO) is a valuable chiral synthon and can be produced from pyrolysis of cellulose and biomass. In the present study, Ni-P-MCM-41 catalysts with various P-to-Ni ratios were prepared and employed for selective production of LGO from biomass. Both analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and lab-scale experiments were conducted to explore the effects of several factors on the formation of LGO, including P-to-Ni ratio in Ni-P-MCM-41, catalyst/sample ratio and pyrolysis temperature. The results revealed that all the Ni-P-MCM-41 catalysts, especially the one with a P-to-Ni ratio of 5, exhibited excellent catalytic capability and selectivity for LGO production. For Py-GC/MS, the maximal LGO yields of 27.34 wt% and 14.30 wt% were achieved from cellulose and pine at 350 °C with catalyst/cellulose ratio of 3 and catalyst/pine ratio of 2, respectively. While in lab-scale experiments, the highest LGO yields from cellulose and pine were 21.37 wt% and 10.71 wt%, with the corresponding selectivity of 78.31% and 53.75%, respectively. The Ni-P-MCM-41 catalyst possessed much better catalytic efficiency on the LGO production than previously reported catalysts, including H 2 SO 4 , H 3 PO 4 , solid superacid, solid phosphoric acid and activated carbon.
研究领域:
化学工程
·
可再生能源
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催化
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Haozhan Chu,Shaojuan Zeng,Xiangping Zhang,Guoxiong Zhan,Bo Wang,Hongyu Zhang,Sheng Zhong,Wei Liu
Ionic liquids (ILs) show great application potentials in CO 2 capture due to extremely low vapor pressures, tunable structures, and strong CO 2 affinity. Up to date, many efforts have been focused on the design and absorption performance of novel functionalized ILs, rather than desorption performance. In our previous work, the IL solvent [Cho][Triz]/TMS exhibited exceptional CO 2 absorption performance. As a successive study on decreasing regeneration energy consumption, this work focused on the design and synthesis of novel metal-modified MCM-41 catalysts with multiple acidic sites to enhance CO 2 catalytic desorption in the nonaqueous [Cho][Triz]/TMS (80 wt%/20 wt%) absorbent under lower temperatures. Among all the composite MCM-41 catalysts, the CoM-1/4 catalyst exhibits superior catalytic performance because of the increase of Brønsted acid sites by 232.3 % and Lewis acid sites by 56.2 % compared with pristine MCM-41, which promote CO 2 desorption by accelerating C-N bond breaking. The CO 2 desorption rate and amount increased by 180.2 % and 95.7 %, and the activation energy reduced by 46.7 % compared to the non-catalysis. Therefore, the theoretical regeneration energy consumption of the catalyst-added system was 0.88 GJ/t CO 2 , representing a 76.7 % reduction compared with the 30 wt% MEA solution. Furthermore, the CoM-1/4 catalyst maintained high catalytic activity after 20 cycles. This work indicated that the CoM-1/4 catalyst effectively enhanced the regeneration performance of IL absorbent, facilitating the development of an energy-efficient CO 2 capture process for industrial applications.
研究领域:
化学工程
·
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2014
·
IF 3.209
Ben Qi,Lan-Lan Lou,Yanbing Wang,Kai Yu,Ying Yang,Shuangxi Liu
Manganese containing mesoporous materials Mn-MCM-41 were prepared by template-ion exchange (TIE), in situ reduction (ISR), direct hydrothermal (DHT) and wetness impregnation (WI) methods. The samples were characterized by XRD , N 2 adsorption–desorption, HR-TEM, TG, UV–Vis, H 2 -TPR and ESR techniques, which illustrated that the definite structure of the MCM-41 was retained after introducing Mn into MCM-41 by different method. The catalytic activity and selectivity of the Mn-MCM-41 in the epoxidation of styrene with 30% H 2 O 2 as an oxidant agent were explored. The TIE catalysts showed the highest activity but Mn 2+ was leached during the reaction. The ISR catalysts exhibited high activity for epoxidation of styrene. Furthermore, recycling studies proved the ISR catalysts as heterogeneous catalysts , which did not lose the catalytic activity after four recycles appreciably. However, the DHT and WI catalysts showed poor performance in the catalytic epoxidation of styrene. Various parameters such as different reaction molar ratio of H 2 O 2 /styrene, catalyst amount, and kinds of solvents were studied to optimize the reaction conditions.
研究领域:
催化化学
·
材料化学
·
有机合成
·
多相催化
·
环境友好氧化过程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Guoqiang Shen,Lun Pan,Zhe Lü,Chongqing Wang,Fazal-e- Aleem,Xiangwen Zhang,Ji-Jun Zou
Adsorption and photodegradation are promising approaches for removing organic pollutions. In this study, we combined these two processes by co-loading Fe-TiO 2 and Fe 2 O 3 quantum dots (QDs) on porous MCM-41, using a simple hydrolysis method. X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy results indicated that Fe-TiO 2 QDs are formed at low Fe precursor concentrations, while additional Fe 2 O 3 QDs are formed at higher Fe precursor concentrations. The Fe 2 O 3 and Fe-TiO 2 QDs impart high adsorption capacity and high photoactivity to the porous MCM-41, respectively. Thus, their combination results in a synergic effect of the adsorption and photodegradation. The highest-performing sample exhibits excellent performance in removing rose bengal from aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 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）