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The catalytic activity of iodine in the esterification reaction was studied by synthesis cyclohexyl acetate from acetic anhydride, cyclohexano and acetic acid, cyclohexano.
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摘要以单质碘为催化剂，通过乙酸酐、环己醇及乙酸、环己醇为原料合成乙酸环己酯，对碘的催化活性进行了研究。 |
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The catalytic activity of some vanadium phosphorus oxides was also compared, and the results showed that higher product yields were obtained when using acetonitrile as the solvent than using toluene.
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此外，对不同钒磷氧化物的催化活性进行了比较，结果表明，在乙腈溶剂中的产品收率比在甲苯溶剂中高。 |
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The catalytic applications of the mesoporous materials in epoxidation of olefins are summarized, including the preparation methods and modification of the materials, catalytic performance and characterization of active sites.
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摘要本文综述了介孔材料在烯烃环氧化反应中的应用，包括材料的制备方法、催化性能以及活性中心的表征。 |
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The catalytic center of an enzyme is composed of a set of amino acids whose three-dimensional arrangement forms the “active-site” that allows them to efficiently bind and modify the substrate.
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酶的催化中心是由一组氨基酸组成，其三维结构形成活性位点，允许它高效地结合或修饰底物。 |
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The catalytic properties of zinc oxide catalysts from zinc oxide, zinc acetate calcined at 600℃ and zinc carbonate prepared through deposition, in the synthesis of dimethyl carbonate by alcoholysis of urea were studied.
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摘要研究了在600℃煅烧氧化锌、醋酸锌和沉淀法制得碳酸锌而得到的氧化锌催化剂，对尿素醇解制备碳酸二甲酯的催化作用。 |
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The catastrophe of a tragedy usually brings death or ruin to the leading character.
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悲剧的结局常常是主角的死亡或彻底失败。 |
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The catch is that property developers are turning the decrepit buildings, abandoned when most businesses fled a crime-wave for the northern suburbs in the early 1990s, into swanky apartment blocks, and property prices have been rocketing.
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上世纪90年代初，多数商业公司因为要远离原所在地的犯罪高潮而搬迁到北郊，吊诡之处在于，房地产开发商将他们遗弃的破楼改造成了时尚公寓街区，而房价也一路上涨。 |
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The catch is that reform throughout the region is flagging.
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问题是这一地区的改革渐趋颓势。 |
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The catch is that these card games are addictive.
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但是问题的关键在于这些游戏玩起来上瘾。 |
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The catch of anchovy is analyzed based on the practice of inshore anchovy trawling. The formula for output calculation per net is established and confirmed.
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摘要根据中国近海捕捞鳀鱼拖网渔船的实际生产作业情况，对近海拖网渔船捕捞鳀鱼的渔获量进行了分析，建立了相应的网次平均产量公式，并对该公式进行了验证。 |
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The catch of the door doesn't fit on any more.
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这扇门的门扣再也扣不上了。 |
