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• 2017-03-29 03:49发布了问答

  决定酸碱催化剂活性和选择性的基本因素是什么答案

  　

  408人看过

• 2016-04-25 09:09发布了问答

  制备碳纳米管时，对Fe催化剂薄膜等离子体刻蚀后的sem图像的分析结果如

  何描述？

  495人看过

• 2013-11-01 15:30发布了问答

  关于酵素，如何揭穿酵素的伪科学面目？

  　

  423人看过

• 2009-05-31 04:30发布了问答

  帮忙翻译 化工文献 在线等 拒绝使用自动翻译

  Nano-sized Beta zeolites， with a crystal size of 80–100 nm， were synthesized via surface wet method. The nano-sized Hbeta zeolites exhibit much higher activity and stability in the Friedel–Crafts acylation of anisole and toluene with acet... Nano-sized Beta zeolites， with a crystal size of 80–100 nm， were synthesized via surface wet method. The nano-sized Hbeta zeolites exhibit much higher activity and stability in the Friedel–Crafts acylation of anisole and toluene with acetic anhydride than theconventional zeolites of largeparticle size.The smallcrystalsize of nano-sized zeolitesmay bringon more accessible activesites and then enhance the catalytic activity. The exposed pore openings in nano-sized zeolites allow a fast desorption of heavy products from the catalyst and can then reduce the occupancy of active sites by the adsorption of products ，this can then alleviate the catalyst deactivation and improve the catalyst stability deactivation and improve the catalyst stability. 急用 在线等 拒绝用自动翻译 因为这个谁都会 如果有超级好用的自动在线翻译或软件也可以推荐 展开

  394人看过