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Unnatural amino acid site - directed mutagenesis was applied to adenylate kinase to study its mechanism. 非天然氨基酸定点突变成功地应用在腺苷酸激酶上来研究其作用机理。
Overall acid is stronger than those of zeolites,e. g. ,HY and HZSM-5,in strength,though concentration of acid sites is relatively lower. Br?nsted酸位和Lewis酸位同时存在;酸性强于沸石分子筛(如HY和HZSM-5);但酸位浓度相对较低.
The R1 value determined by the new method can be well correlated with E-cat unit cell size and acid site density, and is consistent with the product distribution obtained from fixed fluidiz... 该方法得到的R1值与催化剂的平衡晶胞、酸中心密度有较好的相关性,与固定流化床的结果相比,趋势基本一致,可用于预测裂化催化剂上反应所得催化裂化汽油的质量。
Enhancement of the quantity of strong acid sites is the trend in development of C4-olefins cracking catalysts. 尽可能提高催化剂表面强酸的酸量是C4烯烃催化裂解制丙烯反应催化剂的研制方向。
On the other hand, both Br? nsted and Lewis acid sites are observed on PW/USY catalysts. 由于PW与USY孔壁的弱相互作用，PW和USY的酸性中心得到保存，PW/USY催化剂的酸量较USY和PW有较大提高，其表面同时存在B（Br?nsted）酸和L（Lewis）酸中心。
The experimental results show that ammonia molecule is adsorbed preferentially on the B acid sites. 实验结果还表明氨分子在B酸中心上优先被吸附。
Medium-strength acid sites are predominant in NiO-ZSM-5, which promote producing triethylenediamine(TEDA). 而 NiO-ZSM-5 含有大量中等强度的酸中心,有利于三乙烯二胺(TEDA)生成。
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。
It is shown that the acid sites of the zeolites play an important role on coke deposition. 酸强度越高,越容易积炭,酸量越大积炭越多。
It is suggested that the interaction of SO 2- 4 group with Zr in binary oxide result in the forming of acid sites. 研究结果表明 ;SO2 - 4基团与二元氧化物中Zr原子作用形成了酸性中心 .
The experimental results pointed out that the three kinds of active sites exist on the surface of the catalysts: Metallic site Cu, Lewis acid sites V~(5+) and Ti~(4+), Lewis base sites bridge O in V-O-Ti and terminal O in V=O. 实验结果表明:在Cu/V2O5-TiO2催化剂表面存在金属位Cu、Lewis酸位V5+和Ti4+以及Lewis碱位V-O-Ti的桥氧和V=O的端氧三类活性中心;
The coexistence of acid sites and nickel sulfide sites on the zeolite will promote the thiophene hydrodesulfurization reaction significantly. 催化剂表面酸性位和硫化镍活性位共存;对噻吩加氢脱硫反应是有利的.
The results showed that both L and B acid sites exist on SO- 2- 4/TiO 2 photocatalys t while only L acid sites on TiO 2 photocatalyst. 结果表明 ,TiO2 光催化剂的表面只有L酸中心 ,而SO2 -4 /TiO2 光催化剂表面既有L酸中心也有B酸中心。
The dynamic processes of Bronsted acid sites involved in the formation ofintermediates are observed directly by ]H MAS NMR. 直接观测到了B酸位(活性中心)在反应中的动态变化过程，B酸位参与了中间物种的生成。
There existed both Lewis acid sites(Fe~(3+),Mo~(6+)) and Lewis base sites(oxygen of Mo=O and Mo-O-Fe bond) on the surface of the catalysts. 催化剂表面由Lewis碱位(MoO键的端氧和Fe-O-Mo键中的桥氧)及Lewis酸位构成。
The acid sites of zeolite Y catalysts for alkylation of aromatics with long-chain alkenes are determined with IR and TPD. 用IR和TPD方法,研究了长链烯烃与芳烃的烷基化反应的Y型沸石催化剂的酸性对反应的作用。
These results indicate that the presence of strong acid sites favors the improvement of both phenol conversion and 2,4-DTBP selectivity. 这表明强酸中心的出现有利于提高苯酚的转化率和 2，4-二叔丁基苯酚的选择性。
After being characterized by FTIR and MAT,it was found that with increasing P content,the number of total acid sites and Bronsted acid sites on cat. 在用FTIR技术和MAT试验等催化剂表征手段对其表征之后，发现酸性、酸密度和强度等与催化剂的裂化性能有很大关系；
The active centers of ethoxylation are composed of WO x and W 6+ ; the active centers of activated alcohol are the weak Bronsted acid sites of carrier ( e.g., HZSM-5 ). 氧缺位的WOx 和W6+ 共同组成催化剂表面L酸活性中心 ;而载体 (如H -ZSM -5)弱的B酸位是醇 (ROH)的活性中心 .
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。