检索结果-南通市图书馆

MgO/Carbon nanocomposites synthesized in molten salts for catalytic isomerization of glucose to fructose in aqueous media

引用

Green Chemical Engineering 2022年第4期3卷 359-366页

作者： Yuchao Shao Dong-Yang Zhao Wenjing Lu Yuyang Long Weicheng Zheng Jun Zhao Zhong-Ting Hu College of Environment Zhejiang University of Technology(ZJUT)Hangzhou310014China HKBU institute of Research and Continuing Education Shenzhen518057China institute of Bioresource and Agriculture Department of BiologyHong Kong Baptist UniversityHong Kong SARChina School of Environment Tsinghua UniversityBeijing100084China industrial catalysts institute of zjut Hangzhou310014China Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling Instrumental Analysis CenterSchool of Environmental Science and EngineeringZhejiang Gongshang UniversityHangzhou310012China Hangzhou Research institute of China Coal Technology&Engineering Group Hangzhou311201China

Isomerization of glucose into fructose has always been an important step in the biorefining *** study synthesized a novel Mg-decorated carbonaceous catalyst by molten salt method for the application of glucose *** morphology of carbon microspheres was formed with high specific surface area and pore *** effects of Mg loading,catalyst dosage,reaction temperature,and reaction time were investigated and *** highest fructose yield of 34.58%and fructose selectivity of 81.17%were achieved by the catalyst named Mg(100mg)/Carbon at hydrothermal temperature of 100℃ with reaction time of 1.5-2 h,showing the superiority of the *** results of recycling tests indicated Mg(100mg)/Carbon has good recyclability and can restore its activity after a simple *** the possible mechanism of glucose isomerization by Mg(100mg)/Carbon was *** study provided a new method for overcoming the difficulty of high energy barrier required for glucose isomerization in the biorefining process.

关键词： Glucose isomerization Heterogeneous catalyst Molten salt method Magnesium Hydrothermal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High-sensitivity intelligent packaging films harnessing rose anthocyanins and hydrophilic silica aerogel for visual food freshness monitoring

引用

Food Quality and Safety 2024年第1期8卷 179-189页

作者： Wenjun Wu Luman Zheng Jiahao Yu Liming Liu Gulden Goksen Ping Shao Department of Food Science and Technology Zhejiang University of TechnologyZhejiangHangzhouChina Department of Food Technology Vocational School of Technical Sciences at Mersin Tarsus Organized Industrial ZoneTarsus UniversityMersinTurkey Eco-industrial Innovation institute zjut Zhejiang University of TechnologyZhejiangQuzhouChina

The enhancement of the sensitivity for anthocyanin-based indicator films in food freshness monitoring in real time is important for *** this study,hydrophilic silica aerogel(SiO2 NA)was incorporated into corn starch(CS)/chitosan(CH)/rose anthocyanins(RACNs)-encapsulated potato amylopectin nanoparticles(APNPs)composite film to increase the sensitivity for shrimp freshness *** microstructure of films revealed that the gas absorption capacity was improved by amorphous SiO2 NA via hydrogen *** pore size(1.74–5.60 times),pore volume(3.92–5.60 times),and specific surface area(2.21–2.34 times)of films increased with the addition of SiO2 *** sensing of NH3 and pH and the reversibility of films were also ***,the pH-responsive films containing SiO2 NA changed visibly in color from purple–red to orange–gray and finally to gray,enabling effective monitoring of shrimp freshness during storage at 4°***,anthocyanin-based indicator films with improved sensitivity by adding SiO2 NA were successfully designed for monitoring shrimp freshness.

关键词： Hydrophilic silica aerogel anthocyanins sensitivity pH-responsive shrimp freshness intelligent packaging

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

La_2Ce_2O_7 supported ruthenium as a robust catalyst for ammonia synthesis

引用

Journal of Rare Earths 2019年第5期37卷 492-499页

作者： Wenfeng Han Zhi Li Huazhang Liu institute of industrial Catalysis Zhejiang University of Technology

La_2Ce_2O_7 nanoparticles were prepared by citric acid complexation method followed by calcination at varied temperatures. Then, supported with 4 wt% Ru, they were evaluated as the catalysts for ammonia synthesis under conditions similar with industry. With La_2Ce_2O_7 being calcinated at 700 or 800℃, the experimental results indicate that the Ru/La_2Ce_2O_7 catalyst exhibits much higher ammonia concentration or ammonia synthesis rate than that of Ru/CeO_2 and Ru/La_2O_3. In addition, Ru/La_2Ce_2O_7 possesses high stability under over-heating test. In the absence of any promotor, ammonia concentration of Ru/La_2Ce_2O_7 catalyst approaches 14% at 450℃, GHSV of 10000 h^(-1) and pressure of 10 MPa. The rate-determining step of ammonia synthesis, dissociation of N_2 is significantly facilitated by the strong metalesupport interaction(SMSI) between Ru and La_2Ce_2O_7. Due to the interaction, La_2Ce_2O_7 tends to donate electrons to Ru,resulting in the high electron density over the surface of Ru active sites which is favorable for the dissociation of N_2. Consequently, high activity is achieved.

关键词： Ammonia synthesis Ruthenium La2Ce2O7 Activation energy Nanoparticles Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Removal of formaldehyde over Mn_xCe_(1- x)O_2 catalysts: Thermal catalytic oxidation versus ozone catalytic oxidation

引用

Journal of Environmental Sciences 2014年第12期26卷 2546-2553页

作者： Jia Wei Li Kuan Lun Pan Sheng Jen Yu Shaw Yi Yan Moo Been Chang Graduate institute of Environmental Engineering National Central University industrial Technology Research institute

MnxCe1- xO2（x： 0.3–0.9） prepared by Pechini method was used as a catalyst for the thermal catalytic oxidation of formaldehyde（HCHO）. At x = 0.3 and 0.5, most of the manganese was incorporated in the fluorite structure of Ce O2 to form a solid solution. The catalytic activity was best at x = 0.5, at which the temperature of 100% removal rate is the lowest（270°C）. The temperature for 100% removal of HCHO oxidation is reduced by approximately 40°C by loading 5 wt.% Cu Oxinto Mn0.5Ce0.5O2. With ozone catalytic oxidation, HCHO（61 ppm） in gas stream was completely oxidized by adding 506 ppm O3 over Mn0.5Ce0.5O2 catalyst with a GHSV（gas hourly space velocity） of 10,000 hr-1at 25°C. The effect of the molar ratio of O3 to HCHO was also investigated. As O3/HCHO ratio was increased from 3 to 8, the removal efficiency of HCHO was increased from 83.3% to 100%. With O3/HCHO ratio of 8, the mineralization efficiency of HCHO to CO2 was 86.1%. At 25°C, the p-type oxide semiconductor（Mn0.5Ce0.5O2） exhibited an excellent ozone decomposition efficiency of 99.2%,which significantly exceeded that of n-type oxide semiconductors such as Ti O2, which had a low ozone decomposition efficiency（9.81%）. At a GHSV of 10,000 hr-1, [O3]/[HCHO] = 3 and temperature of 25°C, a high HCHO removal efficiency（≥ 81.2%） was maintained throughout the durability test of 80 hr, indicating the long-term stability of the catalyst for HCHO removal.

关键词： Formaldehyde Volatile organic compounds Indoor air pollutant Thermal catalytic oxidation Ozone catalytic oxidation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Behavior of adsorbed diphenyl-sulfide on the Pd/C catalyst for o-chloronitrobenzene hydrogenation

引用

Chinese Chemical Letters 2013年第1期24卷 59-62页

作者： Chang Su Xiao-Nian Li Qun-Feng Zhang Lei Ma Chun-Shan Lu Feng Feng industrial Catalysis institute of Zhejiang University of Technology

A series of diphenyl-sulfide （Ph2S）-immobilized Pd/C catalysts （Pd-Ph2Scx）/C） were prepared using the wetness-impregnation and immobilization method. Pd-Ph2S（x）/C catalysts employed for the hydro- genation of o-chloronitrobenzene showed very high selectivity. The structure of Pd-Ph2Scx）/C with different molar ratio of ligand （x-values） was characterized by XPS and TG-DSC-MS. The results suggest a ＂saturated＂ surface ratio of Ph2S/Pd （about 0.3） was formed on the Pd-Ph2S（x）[C catalysts surface. The Ph2S immobilized on the Pd particle is quite stable, and the desorption of Ph2S or dissociative loss of phenyl group was only found at temperatures above 500 K. The possible catalytic mechanism of the Pd-Ph2S（x）/C catalyst was also discussed.

关键词： Pd-Ph2S(x)/C o-Chloronitrobenzene Hydrogenation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of carbon-supported Pd/SnO_2 catalyst for highly selective hydrogenation of 2,4-difluoronitrobenzene

引用

Chinese Chemical Letters 2014年第8期25卷 1137-1140页

作者： Jia Zhao Lei Ma Xiao-Liang Xu Feng Feng Xiao-Nian Li industrial Catalysis institute of Zhejiang University of Technology

Halogenated anilines have a wide range of applications in the production of pharmaceuticals and agrochemical substances, and thus it is of great importance to develop highly active and selective catalysts for the hydrogenation of halogenated nitrobenzenes. We approach this challenge by probing noble metal/non-noble metal oxide nanoparticles（NPs） catalysts. Carbon-supported Pd/SnO2catalysts were synthesized by the chemical reduction method, and their catalytic activity was evaluated by the hydrogenation reaction of 2,4-difluoronitrobenzene（DFNB） to the corresponding 2,4-difluoroaniline（DFAN）, showing a remarkable synergistic effect of the Pd and SnO2 NPs. The as-prepared Pd/SnO2/C catalysts were characterized using TEM, XRD, H2 TPD and XPS techniques. Modifications to the electronic structure of the Pd atoms through the use of SnO2 led to the suppression of the hydrogenolysis of the C–F bond and the acceleration of nitrosobenzene（DFNSB） conversion and consequently, resulted in the inhibition of the formation of reactive by-products and may be responsible for the enhancements observed in selectivity.

关键词： Tin dioxide Palladium Selective hydrogenation 2.4-Difluoronitrobenzene

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Aqueous-phase hydrogenation of levulinic acid over carbon layer protected silica-supported cobalt-ruthenium catalysts

引用

Chinese Journal of Chemical Engineering 2021年第10期34卷 114-122页

作者： Lihua Qian Guojun Lan Xiaoyan Liu Zhenqing Li Ying Li institute of industrial Catalysis Zhejiang University of TechnologyHangzhou 310014China

The hydrogenation of levulinic acid(LA)to c-valerolactone(GVL)by using water as solvent is a crucial process in the production of fine chemicals from *** ultrathin carbon layer coating CoRu bimetallic catalyst supported on silica(CoRu@C/SiO2)is prepared by using tannis-ligated cobalt-ruthenium complex on silica as precursors,and applied for catalyzed synthesis of GVL from *** of the synergistic effect between cobalt and ruthenium,the addition of small amounts of Ru to Co catalysts can increase the catalytic activity in the aqueous hydrogenation of *** ultrathin carbon layer covered on the CoRu bimetallic catalyst can greatly reduce the leaching of active *** CoRu@C/SiO2 catalyst achieves high stability and is reused up to 5 runs without significant loss of performance in aqueous hydrogenation of levulinic acid.

关键词： Levulinic acid Hydrogenation Cobalt-ruthenium Synergistic effect Carbon coating

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Oxygen and nitrogen-doped metal-free carbon catalysts for hydrochlorination of acetylene

引用

Chinese Journal of Chemical Engineering 2016年第4期24卷 484-490页

作者： Tongtong Zhang Jia Zhao Jiangtao Xu Jinhui Xu Xiaoxia Di Xiaonian Li industrial Catalysis institute of Zhejiang University of Technology Hangzhou 310014 China

Activated carbon was tested as metal-free catalyst for hydrochlorination of acetylene in order to circumvent the problem of environment pollution caused by mercury and high cost by noble metals. Oxygen-doped and nitrogen-doped activated carbons were prepared and characterized by XPS, TPD and N2 physisorption methods. The influences of the surface functional groups on the catalytic performance were discussed base on these results. Among all the samples tested, a nitrogen-doped sample, AC-n-US00, exhibited the best performance, the acety- lene conversion being 92% and vinyl chloride selectivity above 99% at 240 ~C and C2H2 hourly space velocity 30 h- 1. Moreover, the AC-n-US00 catalyst exhibited a stable performance during a 200 h test with a conversion of acetylene higher than 76% at 210 ~C at a C2H2 hourly space velocity 50 h 1. In contrary, oxygen-doped catalyst had lower catalytic activities. A linear relationship between the amount of pyrrolic-N and quaternary-N species and the catalytic activity was observed, indicating that these nitrogen-doped species might be the active sites and the key in tuning the catalytic performance. It is also found that the introduction of nitrogen species into the sample could significantly increase the adsorption amount of acetylene. The deactivation of nitrogen- doped activated carbon might be caused by the decrease of the accessibility to or the total amount of active sites.

关键词： Acetylene hydrochlorinationActivated carbonSurface chemistryOxygenated groupNitrogen-doped

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dual active sites over Cu-ZnO-ZrO_(2) catalysts for carbon dioxide hydrogenation to methanol

引用

Journal of Environmental Sciences 2023年第9期131卷 162-172页

作者： Xiucheng Sun Yifei Jin Zaizhe Cheng Guojun Lan Xiaolong Wang Yiyang Qiu Yanjiang Wang Huazhang Liu Ying Li institute of industrial Catalysis Zhejiang University of TechnologyHangzhou 310014China

CO_(2) hydrogenation to methanol is a significant approach to tackle the problem of global warming and simultaneously meet the demand for the portable ***-ZnO catalysts with various kinds of promoters have received wide ***,the role of promoter and the form of active sites in CO_(2) hydrogenation are still in ***,various molar ratios of ZrO_(2) were added into the Cu-ZnO catalysts to tune the distributions of Cu^(0) and Cu+species.A volcano-like trend between the ratio of Cu+/(Cu++Cu^(0))and the amount of ZrO_(2) is presented,among which the CuZn10Zr(the molar ratio of ZrO_(2) is 10%)catalyst reaches the highest ***,the maximum value of space-time yield to methanol with 0.65 gMeOH/(gcat·hr)is obtained on CuZn10Zr at reaction conditions of 220°C and 3 *** characterizations demonstrate that dual active sites are proposed during CO_(2) hydrogenation over CuZn10Zr *** exposed Cu^(0) takes participate in the activation of H_(2),while on the Cu^(+) species,the intermediate of formate from the co-adsorption of CO_(2) and H_(2) prefers to be further hydrogenated to CH_(3)OH than decomposing into the by-product of CO,yielding a high selectivity of methanol.

关键词： Cu-ZnO-ZrO_(2) CO_(2)hydrogenation Methanol Dual active sites Formate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High-performance Cu/Zn O/Al_(2)O_(3) catalysts for methanol steam reforming with enhanced Cu-ZnO synergy effect via magnesium assisted strategy

引用

Journal of Energy Chemistry 2021年第12期30卷 550-557,I0013页

作者： Zaizhe Cheng Wenqiang Zhou Guojun Lan Xiucheng Sun Xiaolong Wang Chuan Jiang Ying Li institute of industrial Catalysis Zhejiang University of TechnologyHangzhou 310014ZhejiangChina

Methanol steam reforming(MSR) is an attractive approach to produce hydrogen for fuel *** to the limited catalyst loading volume and frequent start-ups and shut-downs on board,it is highly desired to develop an extremely active and robust ***,on the basis of industrial Cu/ZnO/Al_(2) O_(3) catalysts,a series of CuZnAl-xMg catalysts with enhanced Cu-ZnO synergy were synthesized via magnesium assisted *** incorporation of magnesium was found to be beneficial to the enhancement of catalytic activity and stability of catalyst.A combination of complementa ry characterizations(***,H_(2)-TPR,N_(2) O chemisorption,TEM,XPS analysis etc.) proves that isomorphous substitution of Cu^(2+)in malachite phase gives rise to more dispersive Cu and ZnO NPs,and the increased Cu^(+)/Cu~0 ratio indicates the strengthened Cu-ZnO synergy effect,which leads to the boosted stability during the thermal treatment.

关键词： Methanol steam reforming Cu/ZnO/Al_(2)O_(3) Doping Magnesium Hydrogen

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：