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- 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.
- 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。
- 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
- 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 acidities of HY, USHY and SSHY zeolites were modified by K 2SO 4 solution , the acid strength and acid amount of zeolites could be controled by adjusting the concentration and temperature of K 2SO 4 solution and the frequency of exchange. 用K2SO4 溶液对HY、USHY 和SSHY 沸石的酸性进行改性,通过调节K2SO4 溶液的浓度、温度和交换次数,可控制沸石的酸强度和酸量。
- He gave me a taste of his acid wit. 他让我尝到了他敏锐尖刻之机智的滋味。
- Acid irritates the stomach lining. 酸能刺激胃黏膜。
- Acid had pitted the surface of the silver. 酸把银器的表面腐蚀了。
- I am doing an experiment of neutralizing acid. 我在做一个中和酸的实验。
- Can Jones beat Smith? That's the acid test. 琼斯能击败史密斯吗?那是个严峻的考验。
- Qualitative and quantitative analysis of acid site distribution,and acidity and acid strength of B and L acids can be carried out well by means of newly exploited ~(31)P NMR method. 新发展起来的31P核磁共振技术可较好地实现B酸和L酸的酸中心分布、酸量及酸强度的定性和定量分析。
- A salt or an ester of boric acid. 硼酸盐一种硼酸盐或硼酸酯