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- CHARACTERIZATION OF SURFACE ACIDIC STRENGTH FOR SOLID ACID CATALYST THROUGH TEMPERATURE PROGRAMMED DESORPTION 固体酸催化剂表面酸强度的程序升温脱附表征
- surface acid strength 表面酸强度
- The strength of chemical-strengthening glass is analyzed before and after surface acid etching, and the strength reservation of glass corroded is studied. 对离子交换增强玻璃表面不同程度酸腐蚀后强度变化的情况进行了分析,并对表面腐蚀后强度的保留进行了研究。
- The order of Bronsted acid strength are FSPrHY>FSY>USPrHY>USY>PrHY>NH_4Y. B 酸强度顺序为:FSPrHY>FSY>USPrHY>USY>PrHY>NH_4Y.
- Secondly, the acid strength, specific surface, size and the feature, the structure of acid center and the content of Sulphur and Titanium have been characterized by IR, XRD, TEM, SEM, BET, EDS,TG-DTA and Hammett indicator. 我们利用IR，XRD，TEM，SEM，BET，EDS,TG-DTA，Hammet指示剂法等表征手段对催化剂的酸性，比表面，粒度形貌，酸中心结构，硫钛含量等进行了考察。
- Besides, the conversion of ethanol have been found to be dependent on the amount of surface acid sites on zeolites. 乙醇转化率与分子筛表面酸量有关。
- Crystal structure was obtained by XRD. Relative acid strength and acid amount were gotten by NH3-TPD. 用XRD测试了催化剂的晶体结构,用NH3-TPD测试了催化剂的相对酸强度和酸量分布。
- The reactive condition of catalyst was optimized by orthogonal method. The acid strength and structures of solid superacid catalyst was research. 用正交试验法对催化剂的制备条件进行优化,并对催化剂的酸强度、酸结构进行了系统的研究。 具体工作分为三部分进行:
- The results showed that the catalytic activity and the selectivity for DOX increased with the increase of acid strength and dissociation degree. 结果表明,在酸强度较高的情况下,无机酸离解程度高,能达到较优的催化效果。
- The results of TPR indicated that metal sulfides were the hydrogenation centers, after presulfiding the acid strength of catalyst increased, but the total acid quantity reduced. TPR表明，金属硫化物是加氢活性中心，硫化后的催化剂酸强度增加，但总酸量减小。
- The results of TPR indicated that metal sulfides were the hydrogenation centers,after presulfiding the acid strength of catalyst increased,but the total acid quantity reduced. TPR表明,金属硫化物是加氢活性中心,硫化后的催化剂酸强度增加,但总酸量减小。
- Surface acidity of CLM probably originates from the pillars and its surface hydroxy. 表面酸性可能来源于柱子和表面羟基,柱子的热稳定性对表面羟基,表面酸性均有较大影响。
- Surface acidity is one of the important surface chemical properties of silicate clay minerals. 摘要表面酸性是硅酸盐黏土矿物的重要表面化学性质之一。
- These treatments adjust effectively the surface acidity and pore structure of mordenite. 这些处理过程有效地调节了丝光沸石的表面酸性和孔结构。
- Acid had pitted the surface of the silver. 酸把银器的表面腐蚀了。
- A series of S_2O~(2-)_8/ZrO_2-SiO_2 catalysts with different composition,which have different acid types,acid amount and acid strength at surfaces,were characterized by IR,Py-IR,and XPS. 采用IR、Py-IR、XPS技术考察了不同制备条件下制备的S2O2-8/ZrO2-SiO2类固体超强酸催化剂的表面酸种类、酸量、酸强度.
- Ultrasonic conductometric titration (UCT) is an easy, quick and reliable method for determining surface acidity of zeolites. 对影响超声振荡电导滴定法测定分子筛表面酸性质的因素进行了考察。
- The superacid SZA-20-200-800 has a maximum acid strength (H0<-13.8) measured by Hammett indicator method, indicating that it is a stronger acid than concentrated H_2SO_4 (H0=-11.9). Hammett指示剂测得样品SZA-20-200-800酸强度(H0<-13.;8)最强;酸性大于浓硫酸(H0=-11
- The pillar structure, thermal stability and surface acidity of the pillared clays were investigated by ~(27)Al-NMR, XRD, DTA, IR, Py-IR, TPD. 用~(27)Al-NMR、XRD、DTA、IR、吡啶吸附-IR、正丁胺吸附-TPD等手段表征了柱结构、热稳定性和表面酸性。
- Comparing with SO42/TiO2, the acidic strength and anti-moisture ability of SO42/TiO2-SiO2 catalyst were decreased. 与SO_2~(2-)/TiO_2相比,SO_2~(2-)/TiO_2-SiO_2催化剂的酸强度略有降低、反应物中水蒸汽对催化剂活性的负面影响增加。
