查询词典 furfural

The results showed that:1 78 volatile constituents were identified in the oil,which were mainly caryophyllene,1,5,9,9-tetramethyl-1,4,7-cycloundecatriene,germacrone,eudesmol and furfural,etc.2 The aroma quality and intensity of cigarette were improved,irritation was reduced,and a...

结果表明：①满山红挥发油中共鉴定出78种挥发性成分，主要有石竹烯、1，5，9，9四甲基-1，4，7环十一碳三烯、杜鹃酮、桉叶醇和糠醛等；②该挥发油具有提高B2F和C3F等香气质和香气量，降低刺激性和改善余味的作用。

A novel furan resin was synthesized by polycondensation between furfuralcohol and furfural.

用糠醇和糠醛缩聚制备了新型呋喃树脂。

The catalytic performance of all the amorphous alloy catalysts mentioned above was measured during liquid phase hydrogenation of furfural to furfuryl alcohol, together with the kinetic studies. The relationship between the catalyst performance and the structure of catalyst, surface electronic state of the amorphous alloy has been systematically studied based on a series of characterization of catalysts . Meanwhile, the promoting effects of the support on the thermal stability and catalytic activity of the amorphous alloy catalysts have been discussed.

本文采用一系列的表征方法(XRD、XPS、TEM、BET、氢吸附、TPD等)进一步研究非晶态合金催化剂的表面结构、表面电子态和催化性能之间的关系，探索电子效应和几何效应对催化剂活性中心结构的影响，探索非晶态合金的晶化失活和载体对非晶态结构的稳定化作用，以及修饰剂对催化性能的改善作用等。

Five Co-B amorphous alloy catalysts were prepared by chemical reduction in different media, including pure water and pure ethanol as well as the mixture of ethanol and water with variable ethanol content. Their catalytic properties were evaluated using liquid phase furfural hydrogenation to furfuryl alcohol as the probe reaction.

采用化学还原法在不同介质中制备了5种Co-B非晶态合金催化剂，反应介质包括水、乙醇以及不同乙醇含量的乙醇－水混合溶液，并以液相糠醛加氢制备糠醇为探针反应考察了其催化性能。

Surface organometallic chemistry ; tetrabutyl tin ; HY molecular sieve ; grafting reaction ; catalysis ; furfural ; furfuryl alcohol

表面金属有机化学；四丁基锡； HY分子筛；接枝；催化；糠醛；糠醇

Amorphous alloys represent a variety of special materials with short-range ordering while long-range disordering structure which may provide pathways to the excellent catalytic properties, i.e., good anti-poisoning ability, the higher catalytic activity and selectivity in homogeneous hydrogenation of a,p-unsaturated aldehyde, the low and even none environment pollutionUp to now, in hydrogenation of furfural to furfuryl alcohol, the most commonly used catalysts are Cu-Cr dopant Cu-Cr, and Raney Ni et al.

目前，在糠醛催化加氢反应中所用的催化剂主要有Cu-Cr和修饰的Cu-Cr以及Raney Ni等，Cu-Cr催化剂毒性较高，对环境构成严重的危害，而且易阻塞反应器。

The Cu-doped Co-Cu-B catalyst was prepared by chemical reduction of mixed CoCl_2 and CuCl_2 with KBH_4 in a- queous solution and the effect of the Cu-content on the catalytic performance was investigated during liquid-phase furfural hy- drogenation to furfuryl alcohol.

用KBH_4还原CoCl_2和CuCl_2混合溶液制得Co-Cu-B催化剂，用于糠醛液相选择性加氢制糠醇，研究了不同Cu掺入量对催化剂性能的影响，发现当Cu：Co的摩尔比为9.64×10~(-3)时，催化活性达到最佳。

In the paper, it was reported thatα-Furoic acid was synthesized with the electrooxidation ofα-furfural at the Ni electrode in the NaOH solution.

报道了在NaOH溶液中，以α-呋喃甲醛为原料，在Ni电极上直接电氧化制备α-呋喃甲酸。

Cyclodextrin ; mimic enzyme ; microreator ; furfural ; furoic acid ; catalytic oxidation ; green chemistry

β环糊精；模拟酶；微型反应器；糠醛；糠酸；催化氧化；绿色化学

Catalytic Synthesis of Methyl Furoate by Peroxhydrogen and Sulphate Acid;2. Using hydrochloric acid as a cheap catalyst,perfume methyl furoate was synthesized from methanol and furoic acid prepared from furfural,and was characterized by GC,IR and 1H-NMR.

从糠醛出发，由制备的糠酸和甲醇反应，在盐酸催化下，合成了香料糠酸甲酯，并用IR、1HNMR、GC等进行了表征；探讨了包括高纯度糠酸的制备在内的反应影响因素，在醇酸物质的量之比为 5∶1、催化剂体积占甲醇体积 13。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。