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Polyolefin waste to light olefins with ethylene and base-metal heterogeneous catalysts ÓÃÒÒÏ©ºÍ¼ú½ðÊô·Ç¾ùÏà´ß»¯¼Á½«·Ï¾É¾ÛÏ©Ìþת»¯ÎªÇáÏ©Ìþ ¡ø ×÷ÕߣºRICHARD J. CONK, JULES F. STAHLER, JAKE X. SHI, JI YANG, NATALIE G. LEFTON, JOHN N. BRUNN, ALEXIS T. BELL, AND JOHN F. HARTWIG ¡øÁ´½Ó£º https://www.science.org/doi/10.1126/science.adq7316 ¡øÕªÒª£º ÔÔòÉÏ£¬½«ËÜÁÏ·Ö½â³ÉÆäÔʼ¹¹¼þÊÇÒ»ÖÖÀíÏëµÄ»ØÊÕ²ßÂÔ¡£µ«ÔÚʵ¼ùÖУ¬ÕâÖÖ·½·¨²»¿ÉÄÜÓÃÓÚĿǰʹÓõÄÁ½ÖÖ×î³£¼ûµÄËÜÁÏ¡ª¡ª¾ÛÒÒÏ©ºÍ¾Û±ûÏ©¡£ÒòΪÏà¹Ø·´Ó¦ÔÚÄܺÄÉϲ»Õ¼ÓÅÊÆ¡£×î½ü£¬¼¸×éÑо¿ÈËÔ±±íÃ÷£¬ÓúÏÊʵĴ߻¯¼ÁÒýÈëÐÂÏʵÄÒÒÏ©¿ÉÒÔ½«¾ÛÏ©Ìþת»¯Îª±ûÏ©£¬µ«ÓÃÓÚ´ß»¯µÄ¹ó½ðÊô¼Û¸ñ¹ý¸ß¡£ ÏÖÔÚConkµÈÈË·¢ÏÖ£¬¿ÉÒÔÔÚÕâ¸ö¹ý³ÌÖÐʹÓõØÇòÉϸü·á¸»µÄÑõ»¯ÎÙºÍÄÆµÄ×éºÏ¡£Ñо¿±íÃ÷£¬Ñõ»¯ÎÙÔÚ¶þÑõ»¯¹èÉϺÍÄÆÔÚ¦Ã-Ñõ»¯ÂÁÉϵļòµ¥×éºÏ½«¾ÛÒÒÏ©ºÍ¾Û±ûÏ©»òÁ½ÕߵĻìºÏÎïת»¯Îª±ûÏ©»ò±ûÏ©ºÍÒì¶¡Ï©µÄ»ìºÏÎÔÚ320¡ãCϲúÁ¿´óÓÚ90%£¬¶ø²»ÐèÒª¶ÔÆðʼ¾ÛÏ©Ìþ½øÐÐÍÑÇâ¡£ ¡ø Abstract£º Breaking down plastic into its original building blocks is an ideal recycling strategy in principle. Unfortunately, in practice, this approach isn¡¯t possible for the two most common plastics currently in use, polyethylene and polypropylene, because the reaction is too energetically unfavorable. Very recently, several groups of researchers showed that introducing fresh ethylene with the right catalyst can transform polyolefins into propylene, but the precious metals used for the catalysis are prohibitively expensive. Conk et al. now report that the process works using a more Earth-abundant combination of tungsten oxide and sodium. The research shows that the simple combination of tungsten oxide on silica and sodium on gamma-alumina transforms PE, PP, or a mixture of the two, including postconsumer forms of these materials, to propylene or a mixture of propylene and isobutylene in greater than 90% yield at 320¡ãC without the need for dehydrogenation of the starting polyolefins. |
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