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• 2018-12-01 21:43發(fā)布了問答

  加入什么金屬怎樣減少鐵離子的溶出，是做了催化劑的那種

  　

  355人看過

• 2018-01-05 09:11發(fā)布了問答

  車內的異味怎么除去

  　

  441人看過

• 2017-12-28 10:17發(fā)布了問答

  室內甲醛測試價格大概是多少

  　

  404人看過

• 2017-01-25 00:23發(fā)布了問答

  我把木炭放入氫氣罐中放入高爐中燒能得到甲烷嗎

  　

  346人看過

• 2016-06-01 13:25發(fā)布了問答

  茂金屬是什么

  　

  889人看過

• 2014-02-06 11:01發(fā)布了問答

  苯烷基化生產(chǎn)乙苯所用催化劑是怎么回收的

  　

  437人看過

• 2012-05-09 18:46發(fā)布了問答

  具有生物催化劑特征的核酶(ribozyme)其化學本質是

  　

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• 2011-11-16 03:44發(fā)布了問答

  幾個簡單的化學選修課問題，幫忙解答下啊。每題幾十個字即可。

  1、什么是化學，其研究對象及內容是什么？ 2、什么事納米材料和納米科技？ 3、請舉例討論化學在環(huán)境保護中的作用 4、列舉糖類在生物體內的功能

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• 2011-06-15 10:00發(fā)布了問答

  請問鋁是一種稀土金屬嗎？稀土金屬一共有多少種？

  　

  525人看過

• 2009-07-07 09:19發(fā)布了問答

  相轉移催化劑比如四丁基溴化銨 酸堿性判斷

  是酸性還是堿性現(xiàn)在整得有點暈，大俠們搞點理論支持下自己得觀點謝謝... 是酸性還是堿性 現(xiàn)在整得有點暈，大俠們搞點理論支持下自己得觀點 謝謝 展開

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• 2009-06-04 01:23發(fā)布了問答

  高分求翻譯 在線等 有點長請耐心點，我可以追加分階段 大俠幫忙

  1. NOTE The Effect of Lanthanide Oxides as a Support for Ruthenium Catalysts in Ammonia Synthesis 2. Ruthenium is known to show significant activity for ammonia synthesis， particularly when promoted with alkali metal compounds， some showin... 1. NOTE The Effect of Lanthanide Oxides as a Support for Ruthenium Catalysts in Ammonia Synthesis 2. Ruthenium is known to show significant activity for ammonia synthesis， particularly when promoted with alkali metal compounds， some showing greater activity than iron catalysts under atmospheric pressure (1， 2). In fact， ruthenium catalysts may be regarded as second-generation ammonia catalysts right alongside iron catalysts. Currently， a type of ruthenium catalyst is already being used in a commercial ammonia plant (3)， proving its potential for promising applications in industry. 3. In conclusion， we found that lanthanide oxides (CeO2， Sm2O3， La2O3) were the most effective supports for ammonia synthesis. Furthermore， a significant increase in activity was observed by reduction at high temperatures. Among lanthanide oxides， Ru/Sm2O3 and Ru/La2O3 were found to be more active while only Ru/CeO2 maintained stable activity for a long period of time. Our further studies will focus on the role hydrogen poisoning playing in these systems. 展開

  364人看過