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The catalyst prepares hydrogen (from the fuel) and oxygen (from the air) to take part in an oxidation reaction by assisting both molecules to split, ionize, and release or accept protons and electrons.
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触媒同时帮助来自燃料的氢与来自空气的氧分子分解、解离、释放或接受质子与电子，而发生氧化反应。 |
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The catalysts could be easily filtrated from the reaction mixture and reused.
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有机锡化合物作为催化剂用量少，并能回收再利用。 |
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The catalysts exhibited good adaptability to feedstock at high carbon space velocity, with higher conversion, little pressure drop over the bed, good tolerance to steam hydration, poisoning and coke formation, and good regeneratibility.
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结果表明，该催化剂对原料的适应性较强，使用空速高，转化率高，床层阻力降小，抗蒸汽水合氧化能力、抗毒物能力和抗积炭能力较强，催化剂可还原再生，烧炭速率快。 |
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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。 |
