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- 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。
- relative acidic strength 相对酸强度
- 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.
- 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。
- 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。
- Is our relative strength growing? 我们的相对力量正在增长吗？
- the relative acid content of the soil 土壤相对含酸量
- I don't believe that our relative strength is increasing. 我也不相信我们的相关力量正在增长。
- 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.
- 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。
- 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
- Then we have drawn a conclusion: the maximal acid strength of SO_4~(2-)/TiO_2-SiO_2 solid superacid catalyst is -12.70. The acid centre mode of SO_4~(2-)/TiO_2-SiO_2 is chelate structure. 结果表明:SO_4~(2-)/ZiO_2-SiO_2催化剂的酸强度最大达-12.;70。 SO_4~(2-)/TiO_2-SiO_2固体超强酸的酸中心模型是螫合式双配位。
- It is shown that the catalyst SO 2-_4/Zr-HMS possesses the structure of HMS and with the acid strength by -13.75(H_0). The catalytic activity of SO 2-_4/Zr-HMS in the esterification of phthalic anhydride with butanol is higher than that of SO 2-_4/ZrO_2. 结果表明 ;经过一系列处理后制得的 SO2 -4 / Zr-HMS催化剂具备 HMS中孔分子筛的结构特征 ;其酸强度可达 H0 =-1 3 .;75
- They are now living in relative comfort. 他们现在过着比较安逸的生活。
- He is a distant relative of mine. 他是我的一位远亲。
- My aunt is my only immediate relative. 我姑母是我唯一的至亲。
- He asked me some questions relative to the subject. 他问了我一些有关这个题目的问题。
