-
河南省农区“四化同步”发展的实证研究--以河南省社旗县为例
河南省农区是中原经济区实现“四化同步”发展的重点和关键地区。文章论述了“四化”的内涵及其相互间的辩证联系，剖析了社旗县促进“四化同步”发展的实践及成效，提出了辩证看待发展模式、发挥科技带动作用、制订好产业发展规划、以项目建设为抓手、积极承接产业梯度转移等促进河南省农区“四化同步”发展的政策建议。...
2020-11-03 10:30:25浏览：43
查看 -
河南省三次产业演进及其特征分析--基于河南省1978年～2012年经济数据
基于河南省1978年～2012年的经济数据，借助 SPSS17.0统计软件，对河南省三次产业进行方差分析和聚类分析，河南省三次产业发展可分为三个阶段。“向上发展”是第一阶段的特征，第二阶段呈现“U”型发展特征，第三阶段特征则表现为“稳中有降”。总体上看，河南省的经济已经从农业时代进入工业化时代，但第二产业发展后劲不足，第三产业亟待大力发展。基于此，提出了完善第二产业结构、推动第三产业发展的措施。...
2020-11-03 10:30:25浏览：30
查看 -
-
电力节能技术在电力技术中的应用
企业需要加强对电力计量的管理，有两层含义，其一就是避免因为计量问题而给企业经营带来的隐患，对运行的重要电能计量装置施行质量跟踪、状态监测、抽样检定、动态管理，定期进行对在用计量装置测试数据分析，避免计量装置失准运行，提高在用电能计量装置准确性；其二就是根据电能计量的结果制定相关长效机制，减少不必要的电能损耗或者使用，降低企业产品的成本。...
2020-10-26 22:14:25浏览：27
查看 -
山楂黄酮提取工艺研究
[目的]优化山楂果实和叶中黄酮的提取工艺.[方法]采用单因素和正交试验法研究不同工艺条件对山楂黄酮提取效率的影响,得出最佳提取工艺及相关参数.[结果]试验得出,山楂黄酮提取采用最适宜方法为渗漉法,其最佳工艺参数是:溶剂为50％的乙醇,料液比1∶8 g/ml,浸泡时间72 h,流速为中速(3 ml/min).[结论]此方法工艺简单,成本低,提取率高,无需加热,剩余物无有害残留,适用于山楂黄酮的大批量提取生产....
2020-10-26 22:14:25浏览：23
查看 -
燕麦酸奶加工工艺的研究
燕麦含有丰富的营养成分和功能性成分，其中的膳食纤维对人体有很好的保健作用，将其添加到酸奶中，不仅增加酸奶的膳食纤维含量，而且使酸奶热值降低，营养更全面。利用保加利亚乳杆菌、嗜热乳酸链球菌混合菌种进行乳酸发酵，接种量为2％，培养温度为42~45℃，将燕麦添加量定为4％，8％，12％，16％，20％，24％进行分组试验，研究不同的燕麦添加量对酸奶品质和凝乳时间的影响，确定燕麦的最佳添加量为12％。...
2020-10-22 17:35:41浏览：33
查看 -
La2O2CO3 supported Ni-Fe catalysts for hydrogen production from steam reforming of ethanol
La2O2CO3 was prepared by calcination of La2 (CO3)3 in the air.Catalysts Ni-Fe/La2O2CO3 with different mole ratios of Ni to Fe,Ni/La2O2CO3 and Fe/La2O2CO3 were prepared by impregnation method.The catalytic properties were evaluated on steam reforming of ethanol (SRE) from 300 to 700 ℃ under atmospheric pressure and the samples were characterized by Brunauer-Emmett-Teller method (BET),X-ray diffraction (XRD) and temperature programmed reduction (TPR).The results showed that Ni-Fe bimetallic catalysts exhibited higher activities than single metallic catalysts,which was attributed to the co-existence of well dispersed Ni,Fe and LaFeyNi1 yO3.It was found that the catalyst Ni-Fe/La2O2CO3 containing 10 wt.％ Ni and 3 wt.％-5 wt.％ Fe showed the best performance,the conversion of ethanol was 100％,the selectivity of H2 was higher than 90％,and the selectivity of CO was lower than 1.5％ at 400 ℃....
2020-10-22 17:35:41浏览：106
查看 -
Modeling and Optimization of Catalytic Dehydration of Ethanol to Ethylene Using Central Composite De
The central composite design in the modeling and optimization of catalytic dehydration of ethanol to ethylene was performed to improve the ethylene yield. A total of 20 experiments at random were conducted to in-vestigate the effect of reaction temperature, Si/Al ratios of H-ZSM-5 catalyst and liquid hourly space velocity (LHSV)on the ethylene yield. The results show that the relationship between ethylene yield and the three signifi-cant independent variables can be approximated by a nonlinear polynomial model, with R-squared of 99.9% and adjusted R-squared of 99.8%. The maximal response for ethylene yield is 93.4% under the optimal condition of 328 ℃, Si/Al ratio 85, and LHSV 3.8 h-1....
2020-10-22 17:35:41浏览：46
查看 -
Effect of La on Partial Oxidation of Ethanol to Hydrogen over Ni/Fe Catalysts
The partial oxidation of ethanol to hydrogen was investigated over Ni/Fe/La catalysts prepared by the co-precipitation method. The effects of introduction of La promoter and the reaction temperature on the catalytic performance were studied. It was found that the introduction of La into Ni/Fe catalysts is helpful to increase the selectivity to hydrogen and the stability of the catalysts. The results of XRD and XPS characterization show that the structure of the catalyst was changed during the reaction. The existence of LaFeO3 species is possibly the main reason of the increase of the catalyst stability....
2020-10-22 17:35:41浏览：67
查看 -
Effects of Ethanol Pulping on the Length of Bamboo Cellulose
On the conditions of different ethanol concentration, acids and catalyzers, the effects of ethanol pulping on the cellulose length of bamboo were studied. The results indicates that ethanol pulping has remarkable effects on the length of cellulose, which is clearly reduced with adding ethanol and acid. The margin of length of cellulose become smaller with the increase of the catalyzer. When the ethanol concentration was 70%, the concentration of acid was 0.3% and some NaOH was used as catalyzer, the length of cellulose was the longest....
2020-10-22 17:35:41浏览：59
查看 -
甲烷二氧化碳重整制合成气中积炭效应的数值模拟
通过建立包含动量、质量传递以及化学反应动力学方程的多物理场耦合数值模型，对以Ni为催化剂的甲烷二氧化碳重整制合成气过程中的积炭效应展开了计算。计算结果阐明了包含多孔介质催化剂段的反应通道中的速度场及压力分布，以及在通道中随气体流动以及沉积在催化剂表面的碳颗粒的浓度分布，分析了积炭对催化剂孔隙率和渗透率的影响，并进一步讨论了甲烷浓度以及温度对积炭产生的影响，最后提出了消减积炭的方法。本文的结论对于进一步研究 Ni 基催化剂在 CH4-CO2重整制合成气反应中积炭效应的消减有一定的指导意义。...
2020-10-02 20:35:09浏览：62
查看 -
甲烷部分氧化制合成气催化剂的研究进展
甲烷部分氧化（POM）反应制合成气是化学利用甲烷的有效途径之一。研究表明,甲烷部分氧化反应的工艺有能耗低和反应速率较快等优点,而且所得的H2和CO的比例适于合成甲醇等工业化学品。在该工艺过程中,所需反应容器体积小,反应效率高,可大幅度降低制备合成气的成本。开发POM反应的高效催化剂是进一步提高反应效率、实现工业化的关键途径,因此,是当前国际催化领域研究的热门课题之一。本文主要介绍了传统的金属负载型催化剂和金属氧化物催化剂用于POM反应的研究进展。...
2020-10-02 20:35:09浏览：39
查看 -
关于变压吸附法从鲁奇合成气中分离CO的研究
为从鲁奇合成气中得到体积分数为98%以上的CO产品气,采用新型载铜分子筛吸附剂对鲁奇合成气进行了变压吸附分离的试验和研究。介绍了实验流程和实验装置;阐述了实验方法和步骤;简述了吸附温度在70℃时和常温时的实验数据。研究结果表明：对于甲烷体积分数高达15%的鲁奇合成气,该吸附剂能够高效地分离出CO,CO产品气的体积分数可达98%以上。义马气化厂新建20万t/a醋酸项目配套CO装置已确定选用该吸附剂。...
2020-10-02 20:35:09浏览：48
查看 -
直接乙醇燃料电池阳极电催化剂的研究进展
介绍了直接乙醇燃料电池(DEFC)具有无毒,来源丰富的优点,分析了DEFC在Pt上的电催化氧化机理,讨论了DEFC的阳极电催化剂的重要作用;探讨了具有高电催化活性的新型Pt基催化剂、新型非贵金属催化剂、新型催化剂载体、新型的催化剂制备方法等的研究现状;指明了阳极催化剂将是今后DEFC研究和发展的重要方向之一....
2020-09-30 09:14:00浏览：68
查看 -
