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µÚ¶þƪÊÇ´óʦAlexisT. BellÔÚJ.Catal. ÉÏÃæ·¢±íµÄһƪÎÄÕ£¬Ñо¿µÄÄÚÈÝͦÓÐÒâ˼£¬ÊÇͨ¹ýԭλTEM¹Û²ìPtÄÉÃ׿ÅÁ£»ý̼µÄÐγɹý³Ì¡£Ö®ËùÒÔ½«ÕâÆªÎÄÕ·ÅÔÚÕâÀµÚÒ»ÊÇΪÁËÓ¡Ö¤ÉÏÃæCormaËù˵µÄ£¬Ô­Î»±íÕ÷µÄ¼¼ÊõΪ¶àÏà´ß»¯µÄ·¢Õ¹´øÀ´Á˺ܶàǰËùδÓеıãÀû£»µÚ¶þ£¬Ò²ÊÇΪÁ˲ûÊöÒ»¸öÎÊÌ⣬ÄǾÍÊÇ¡°¶àÏà´ß»¯ÖÐʲôÊÇÈȵ㣿¡±

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Carbon deposition on MgO-supported Pt nanoparticles from ethylene decomposition wasstudied by in situ transmission electron microscopy (TEM) at the atomic level. An imaging strategy was established for controlling beam-gas-sample interactions that minimizes beam-induced changes of the reaction. Using this strategy, it was possible to observe how carbon encapsulation occurs on Pt nanoparticles and the role of the Pt surface morphology. The evidence suggeststhat multiple partial layers grew simultaneously prior to full encapsulation of the nanoparticle. The growth of carbon on Pt nanoparticles was found to induce significant changes in the nanoparticle shape, resulting in particles becoming rounder as coking progressed. Closer examination of the surface structure revealedthat in some cases carbon growth induced step formation.

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1. ¸öÈ˾õµÃ£¬¶àÏà´ß»¯ÖУ¬ºÃµÄÎÄÕÂÓëÑо¿µÄÄÚÈݱ¾Éí²¢Ã»ÓйØÏµ£¬¶øÔÚÓÚÄãÈçºÎ½«ÄãÒªÑо¿µÄÎÊÌâŪÇå³þÒÔ¼°ÄãÑо¿µÄÄÚÈݶÔÓÚ±ðÈËÓжà´óµÄÆô·¢×÷Óá£ÒÔBellµÄÕâÆªÎÄÕÂΪÀý£¬PtÄÉÃ׿ÅÁ£±íÃæµÄ»ý̼Õâ¸öÏÖÏóºÜÔç¾ÍÒѾ­±»ÈËÖªµÀÁË£¬ÔÚÍÑÇâ´ß»¯·´Ó¦ÖУ¬±ÈÈç˵±ûÍéÍÑÇâÖУ¬Pt´ß»¯¼ÁµÄÒ»¸öÖØÒªµÄÎÊÌâ¾ÍÊÇ»ý̼£¬¶øÒýÈëSnµÈÔªËØ£¬¼õÉÙÔØÌåËáÐÔλµãµÈ¾ÍÊÇΪÁËÒÖÖÆ»ý̼(¾­µä´ß»¯¼Á£ºPtSn/Al2O3)¡£ÈËÃÇÒ²ÒѾ­¶ÔÕâ¸öÎÊÌâ½øÐÐÁËһϵÁÐÑо¿£¬ÄÇΪʲôBellµÄÎÄÕ¿ÉÒÔ·¢J.Catal£¬ÎªÊ²Ã´ÕâÆªÎÄÕ¿ÉÒÔ³ÆÖ®ÎªÒ»ÆªºÃÎÄÕÂÄØ£¿¹Ø¼üÔÚÓÚÈçºÎ½«Ñо¿µÄÎÊÌâŪµÃ¸üÇå³þ£¬ÔÚÓÚÑо¿µÄÉî¶ÈÓëÎÄÕ¶ÔÓÚ±ðÈËµÄÆô·¢¡£

2. BellÕâÆªÎÄÕµÄÇÐÈëµãÊÇʲô£¿How multiple carbon layers form on top of each other and what the role of the Pt surface is during carbon encapsulation.

ÒªµãÊÇʲô£¿A careful investigationof the carbon deposition reaction was carried out in which the electron illumination was systematically optimized to establish an approach allowing for conducting the experiments with suppressed electron beam-induced changes while elucidating the mechanism by which Pt nanoparticles coke at high spatial resolution.

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