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SO〓〓/M〓O〓 solid superacid was applied to the photocatalytic oxidation of organic pollutants for the first time. Porous SO〓〓/TiO〓 solid superacid catalysts with high specific surface area were prepared by sol-gel method. The photocatalytic degradation of bromomethane was used as model reaction. The influence of impregnation with H〓SO〓 solution on the structure of catalysts and their photocatalytic performance was systematically studied by using X-ray diffraction, X-ray photoelectron spectroscopy, N〓 sorption analysis applying BET method, UV-Vis diffuse reflectance spectroscopy, FTIR spectroscopy, O〓-TPD and photocatalytic activity measurement. The acidity of TiO〓-based catalysts was investigated by Hammett indicator method, NH〓-TPD and IR spectra of pyridine adsorbtion. The mechanism of superacidifing effects on photocatalytic performances such as the photocatalytic degradation rate of bromomethane, apparent kinetic constant and apparent quantum efficiency was discussed.The results indicated that SO〓〓 is combined with metal ions of TiO〓 in a chelating bidentate mode.

本文首次将SO〓〓/MxOy型固体超强酸催化剂用于光催化氧化有机污染物研究,采用溶胶-凝胶法制备了具有多孔性和大比表面结构的二氧化钛基固体超强酸光催化剂SO〓〓/TiO〓,以光催化降解溴代甲烷为模型反应,系统地研究了H〓SO〓浸渍处理对催化剂表面酸性及其气相光催化性能的影响,结合XRD、BET、XPS、FTIR、Hammett指示剂法、吡啶吸附红外光谱、NH〓-TPD、O〓-TPD、紫外可见漫反射光谱等多种表征手段,深入地讨论了超强酸化对TiO〓的改性机理,阐明了引起SO〓〓/TiO〓超强酸催化剂光催化降解溴代甲烷的转化率、表观反应速率常数和表观量子效率变化的本质原因。

Screening of complex-enzyme-producing strains on Broussonetia papyrifera white bast fiber ;2. According to the classification of pectinase and its action mechanism,the process conditions and effect of pectinase on bio-pulping of bast fiber material are introduce.

综述了果胶酶在制浆造纸上应用的研究进展,从果胶酶系的分类和脱胶机理的角度出发,介绍了果胶酶及其相关微生物在韧皮纤维原料酶法和发酵浸渍法制浆中的作用条件和作用效果,着重介绍了果胶酶在湿部化学上降低阳离子需求量的作用,同时讨论了外界因子对其提高细小纤维和填料留着率效果的影响,并指出果胶酶对纸浆物理性能的影响。

The catalyst prepared by coprecipitation-impregnation has good catalytic performance of maleic anhydride hydrogenation to γ-butyrolactone.

共沉淀-浸渍法制备的20%CuO-20%SnO〓/Al〓O〓催化剂具有较好的顺酐加氢制γ-丁内酯活性,在280℃,顺酐转化率为94.4%,γ-丁内酯选择性为100.0%。

NaZSM-5 zeolites were modified by impregnation with metal nitrate and their catalytic properties for gas phase reaction of γ-butyrolactone and ethanolamine to give intermediate N-hydroxylethyl pyrrolidonewere studied.

采用金属盐溶液浸渍的方法对NaZSM-5分子筛进行改性,考察了ZSM-5分子筛对γ-丁内酯与乙醇胺之间气相反应合成N-羟乙基吡咯烷酮的催化性能。

The catalyst prepared by impregnating SBA-15 in solution of 0.1 mol/L ceric sulfate and being calcined at 300℃ for 3h showed best catalytic activity in synthesis of n-butyl acetate.

用0.1 mol/L的硫酸高铈浸渍SBA-15,焙烧温度为300℃,焙烧时间3h,通过乙酸正丁酯的合成反应考察催化剂Ce-SBA-15的制备,酯化率为95.7%。

Chymosin is extracted by washing and drying the stomach lining, which is then cut into small pieces and macerated in a solution of boric acid or brine at 30°C for 4-5 days.

凝乳酶是提取洗衣机和烘乾胃部内层,然后切成小块,并浸渍在解决硼酸或卤水在30 ℃为4-5天。

It was used for catalytic oxidation of crotonic aldehyde to crotonic acid .

浸渍法制备的Al_2O_3负载金属氧化物为催化剂,催化氧化巴豆醛制备巴豆酸。

Take DMSO swollen treatment and DEA-SO2-DMSO decrystallization treatment for example, the X-ray diffraction and the Tobolsky's intermittent stress relaxation of treated woods were determined during soaking in water, analyzed the effects of water on crystal degree and inter-cohesion of treated woods. According to these continuous relaxation curves measured in water with different temperatures, various thermodynamic quantities were obtained by using Eyring absolute rate theory, and reviewed the chemical reactions in wood which occur in different relaxation process. For the first time quantify these crosslinkings formed in the process of tensional relaxation by using the SMCIR intermittent stress relaxation way, and defined the cross-linking reaction types. In order to find out the contribute of drying to the fixation of deformation of chemically treated wood, stress relaxation of oven-dry untreated and treated wood was measured during the process of temperature elevation and descend, then analyzed the effect of temperature change on relaxation mechanism of treated oven-dry wood. According to continuous relaxation curves of oven-dry treated wood under various constant temperature, calculated the thermodynamics of relaxation process and discussed the mechanism of molecule change in wood, at the same time, also quantified these cross-linkings produced in wood by intermittent method and on the basis of which the model of molecular change during relaxation process of chemically treated was constructed.

以DMSO膨胀处理及DEA- SO2-DMSO非晶化塑化处理为例,测定了两种处理木材在水浸渍过程中的X射线衍射及Tobolsky间歇应力松弛,分析了水对处理木材结晶度及内部凝聚力的影响;通过未处理和两种处理木材在不同温度水中的连续应力松弛测定,应用Eyring的绝对速度反应理论计算并获得了松弛过程中的各热力学量,分析了在水中松弛过程中不同阶段木材内部发生的化学反应;并首次采用SMCIR连续·不连续双曲线应力松弛法定量了轴向拉伸应力松弛过程中木材内部产生的架桥量,明确了交联反应的类型;为了了解干燥对处理木材塑性变形固定的影响,测定了未处理和两种处理绝干木材在温度下降过程和上升过程中的应力松弛,分析了温度变化对处理绝干木材应力松弛的影响;根据多个温度水平下的连续应力松弛测定曲线,计算松弛过程的热力学量,考察了绝干木材在松弛过程中内部发生的分子变化机理,同时也用间歇法定量了木材内部新形成的架桥量,并在此基础上构筑处理木材在松弛过程中内部分子构造的变化模型。

Often repeated impregnation saliva, skin inflammation caused by lip weeks, small red spotted, small papules, chapped, is caused by small desquamative skin, and finally the formation of black-brown pigmentation.

经常反复的唾液浸渍,引起唇周皮肤炎症,出现红色小斑疹,小丘疹,皲裂,乃致皮肤有细小的脱屑,最后形成黑褐色的色素沉着。

One new solvent free impregnating resin based on unsaturated polyester with modified diphenylene ether is prepared.

讨论了促进剂和挥发分抑制剂对无溶剂浸渍漆性能的影响,以及促进机理和抑制机理。

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