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silica-alumina
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  硅铝
     Effect of silica-alumina colloid powder on properties of SiAlON-reinforced Al_2O_3-SiC-C castables
     硅铝凝胶粉结合SiAlON增强A1_2O_3-SiC-C浇注料
短句来源
     n-hexane,n-octane,p-xylene,bengene and ethanol have been adsorbed up to saturation on low silica-alumina ratio ZSM-5 (Si/Al=15),ZSM-11 (Si/Al=15) and Theta-1 (Si/Al=32) at room temperature and relative pressure p/p_0≈0.5.The desorption of these adsorbates is then carried out by temperature programmed desorption (tpd).
     正己烷、正辛烷、对二甲苯、苯和乙醇在低硅铝比 ZSM-5(Ai/Al=15),ZSM-11(Si/Al=15)和 Theta-1(Si/Al=32)上,在室温和相对压力 P/P_0≈0.5时吸附达到饱和后,这些吸附质用程序升温热脱(tpd)方法进行脱附。
短句来源
     Comparative Study of Catalytic Cracking Performance of NBMAS,AlMCM-41,Amorphous Silica-alumina and HZSM-5
     NBMAS,AlMCM-41,无定形硅铝和HZSM-5催化裂化性能的比较研究
短句来源
     The results show that the p-xylene selectivity of unmodified silica-alumina and mordenite is only 14.6 and 33.3% respectively, and the p-xylene selectivity of modified silica-alumina and mordenite is increased up to 34.0 and 43.7% respectively.
     改性后的非晶质硅铝催化剂的对二甲苯选择性由14.6增到34.0%,晶质丝光沸石催化剂改性后由33.3增到43.7%。
短句来源
     The slit/clay ratios of most soils are above 1.3, silica-alumina ratios (SiO_2/Al_2O_3) of the B or major genetic horizons are above 3.7, and the content of free iron oxide ranges from 16-29 g/kg, much lower than that of the Udic Argosols derived from granite in the same area.
     大多数土壤的粉粒/粘粒比值都在1.3以上,土壤B层粘粒硅铝率均大于3.7,游离铁含量(16~29)g/kg,土壤发育程度明显低于同地区的花岗岩风化物发育的湿润淋溶土。
短句来源
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  氧化硅-氧化铝
     Preparation of polyimide/silica-alumina hybrid film
     聚酰亚胺/氧化硅-氧化铝杂化薄膜的制备
短句来源
     EFFECT OF MODIFICATION OF SILICA-ALUMINA AND MORDENITE ON THEIR ACTIVITY AND SELECTIVITY FOR XYLENE ISOMERIZATION
     改性氧化硅-氧化铝和丝光沸石催化剂上的二甲苯异构化
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  “silica-alumina”译为未确定词的双语例句
     The oxidation activity of supported La_(1-x)Sr_xMnO_3 has been greatly improved by modifying the support silica-alumina (SA) , with Mn_2O_3, designated as SAM_y (y is Mn_2O_3 loadings) .
     用Mn_2O_3改性微球硅酸铝(SAMy,y为预载量)作载体,La_(1-x)Sr_xMnO_3催化剂CO氧化活性显著提高。
短句来源
     The calculation predicts that AgNO_3 modified silica-alumina zeolite, through Ag~+ forming π-complexation with C_2H_4, might be deeply remove C_2H_4 species from the CO_2 stream.
     AgNO_3改性HZSM-5也能将CO_2中的C_2H_4脱附到1ppmv以下,但其部分活性中心对C_2H_4的吸附非常强,需要400℃左右才能完全再生。
短句来源
     In B horizons of the soils distributed below 600—700m above sea level, the soil colour is reddish brown or bright reddish brown (5YR5/6—5/8), the ratio of silt/clay smaller than 1.00, the coefficient of weathering and eluviation lower than 0.35, the base saturation lower than 35% and the silica-alumina ratio of clay smaller than 2.4. Kaolinite is dominant in clay minerals.
     海拔600—700m以下的土壤,B层颜色以红棕色和亮红棕色(5YR5/6—5/8)为主,粉砂/粘粒值小于1.00,风化淋溶系数小于0.35,盐基饱和度小于35%,粘粒SiO_2/Al_2O_3多小于2.4。 粘粒矿物以高岭石为主。
短句来源
     Catalysts wemanufactured using impregnation technique with Ni-W metals pairs loaded on modified Y zeolites and amorphous Silica-Alumina as catalyst supports.
     以改性高硅DAY沸石和ASA为载体,采用浸渍法负载Ni-W金属组分制成催化剂。
短句来源
     The effect of different solid materials (quartz, silica-alumina, Y-9 and CRC-1 cracking catalysts) on the oxidation rate of carbon monoxide at the temperature from 600℃ to 680℃ was investigated in a steady flow reactor.
     利用流动法微型反应器研究了不同固态物质(石英砂及Si—Al、Y—9、CRC—1催化裂化催化剂)在600~680℃反应温度范围内对CO氧化速率的影响。
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  silica-alumina
Role of silica-alumina catalyst texture in the reaction of propane oxidative dehydrogenation in the presence of sulfur dioxide
      
The mesostructured silica SBA-15, γ-Al2O3, and amorphous silica-alumina are modified with Ni(acac)2 in the liquid and gas phases.
      
The dominant Ni(acac)2 chemisorption sites on amorphous silica-alumina are the acid hydroxyls of ≡Si-OH-Al= bridges.
      
The methanol adsorption capacity of an amorphous silica-alumina was measured using an equilibrium technique.
      
Coke concentration profiles have been determined by a non-invasive method for the catalytic reaction of xylenes over a silica-alumina bead catalyst.
      
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One of the main difficulties encountered in catalytic cracking of shale oil is the poisoning effect of organic nitrogen bases on silica-alumina catalysts. Employing dealkylation of cumene as the controlling reaction, the authors investigated the poisoning action of pyridine on a silica-alumina catalyst. The authors surveyed the earlier works critically, and proved that in the Frost's equation, not only does 伪 depend upon internal diffusion, but also 尾 is related to external diffusion. Therefore,...

One of the main difficulties encountered in catalytic cracking of shale oil is the poisoning effect of organic nitrogen bases on silica-alumina catalysts. Employing dealkylation of cumene as the controlling reaction, the authors investigated the poisoning action of pyridine on a silica-alumina catalyst. The authors surveyed the earlier works critically, and proved that in the Frost's equation, not only does 伪 depend upon internal diffusion, but also 尾 is related to external diffusion. Therefore, this equation has to be treated as an empirical one generally. Macrokinetic calculations show that when external diffusion plays an important role, Wheeler's calculation method should also be considered as an empirical and conditional one. The pyridine-poisoning curves demonstrate that there are at least two types of acidic active centres and one type of polar centre present on silicaalumina catalyst. The adsorption of pyridine on protonic acid centres is selective. On the same kind of acid centre, pyridine is adsorbed homogeneously, so the poisoning curve gains "anti-selective" shape. Experiments justify the activation action of water and the deactivation effect of excess amount of water. On account of these facts, the authors suggest a new view point with respect to the structure of the active centres on silica-alumina catalyst as well as to the deactivation mechanism.

頁岩油催化裂化的主要困難之一是有機氮碱對硅鋁催化劑的毒害作用.本文以異丙基苯的裂化作為控制反應,用動力學方法考察了硅鋁催化劑為吡啶中毒的情况. 作者批判性地總結了前人的工作,並證明公式中,不僅α取决於內部擴散,且β與外部擴散有關,因此公式一般只能作為經驗公式應用.宏觀動力學計算表明,當外部擴散起作用時,Wheeler的計算方法也只能認為是經驗性的及條件性的。吡啶中毒曲线表明,硅鋁催化劑上至少有兩種酸性活性中心及一種極性中心存在.吡啶對質子酸中心有選擇性吸附作用;但在同類中心上,吡啶的吸附則是均匀的,因而中毒曲线呈现“反選擇性”。實驗也證實了水分的活化作用及過量水分的去活化作用.據此,作者對硅鋁催化劑活性中心結構及其中毒機理提出了新的觀點。

There exist a number of different theories as to the nature and the origin of the acidity of silica-alumina cracking catalysts.Even the proper method for its determination is subject to debate. The authors of this paper studied the acidity of co-precipitated silica-alumina catalysts prepared by the same procedure but containing different proportions of alumina and base-exchanged in different solutions.The acidity of each of these catalysts before and after calcination is determined respectively by...

There exist a number of different theories as to the nature and the origin of the acidity of silica-alumina cracking catalysts.Even the proper method for its determination is subject to debate. The authors of this paper studied the acidity of co-precipitated silica-alumina catalysts prepared by the same procedure but containing different proportions of alumina and base-exchanged in different solutions.The acidity of each of these catalysts before and after calcination is determined respectively by several known methods.In addition the authors devised a new method for the determination of acidity based on the adsorption isotherm in aqueous potassium hydroxide solutions.The data so obtained by these different methods are correlated with the cracking activity of the different catalysts. Based on the results obtained in this work,the mechanism by which acidic centers are formed in the course of catalyst preparation is discussed,and it is proposed that acidic centers of different nature and acid strength,including both Lewis and protonic acid centers,are present on the surface of co-precipitated silica-alumina catalysts.Acid centers of the protonic type made up of two aluminium atoms are believed to be mainly responsible for the cracking activity of such catalysts, although certain other acid centers may also possess catalytic activity to a greater or less extent.

关于硅铝裂化催化剂的酸性的性质和由来存在着一系列的不同理论.甚至测定硅铝催化剂酸性的适当方法也是争论的问题.本文作者用同样的步骤,但用不同氧化铝含量,并用不同的溶液进行离子交换,制备了不同的共胶硅铝催化剂,并研究了它们的酸性.每个催化剂在陪烧前后用几种已知的方法来测定酸性.此外作者还提出了一种新的,基于催化剂在氢氧化钾水溶液中的吸附等温线的酸性测定方法.用这些不同方法所得的数据和催化剂的裂化活性作了比较.根据本工作所得的结果,作者讨论了在催化剂制备过程中酸性中心形成的机理,并提出了下列看法:在共胶硅铝催化剂的表面上存在着不同性质和不同强度的酸性中心,包括路易(Lewis)酸中心和质子酸中心.作者认为这类催化剂的活性主要是由具有两个铝原子的质子酸中心所产生的,虽然某些其它类型的酸性中心也可能在不同程度上具有催化活性。

The acidity, catalytic activity, and platinum dispersion properties of four series of platinum-silica-alumina catalysts were measured and the relationship between these properties was studied. The acidity of the catalyst was varied by changing the Na poisoning conditions for and the alumina content of the carrier. The platinum dispersion condition was varied by changing the calcination temperature for and the platinum content of the catalyst.

研究了不同类型铂硅铝催化剂的铂分散度,并考察了它和催化剂的酸性及活性等相互之间的关系。发现当改变酸性或铂分散度时,催化剂的铂总面积和酸性以及活性三者之间都有平行变化的趋势。这些结果都可用表面复合体生成的观点解释,但与分离中心的观点有所矛盾。

 
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