文献类型：期刊文献

英文题名：Selective Hydrocracking of Waste Polyolefins toward Gasoline-Range Liquid Fuels via Tandem Catalysis over a Cerium-Promoted Pt/HY Catalyst

作者：Zhao, Pengcheng[1];Guo, Wenze[1,2,3];Gui, Zhipeng[1];Jiang, Jie[1];Zhu, Zhihua[1];Li, Jin-Jin[4];Zhao, Ling[1,4];Zhou, Jian[5];Xi, Zhenhao[1,4]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Smart Mfg Energy Chem Proc, Minist Educ, Shanghai, Peoples R China;[3]Delft Univ Technol, Dept Proc & Energy, Large Scale Energy Storage Sect, NL-2628 CB Delft, Netherlands;[4]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[5]SINOPEC Corp, Shanghai Res Inst Petrochem Technol, State Key Lab Green Chem Engn & Ind Catalysis, Shanghai 201208, Peoples R China

年份：2024

卷号：12

期号：15

起止页码：5738

外文期刊名：ACS SUSTAINABLE CHEMISTRY & ENGINEERING

收录：;EI(收录号：20241215782984);WOS:【SCI-EXPANDED(收录号:WOS:001186360700001)】；

基金：This research was financially supported by the National Natural Science Foundation of China (Nos. 21978089 and 22293064), the Program of Shanghai Academic/Technology Research Leader (No. 21XD1433000), and the Key Research and Development Program of Xinjiang Uygur Autonomous Region (No. 2022B01032-1).

语种：英文

外文关键词：polyolefin; hydrocracking; bifunctional catalyst; platinum; cerium oxide; gasoline

摘要：Upcycling of waste plastics into value-added chemicals and fuels represents a promising orientation toward a more sustainable chemical industry. We present a selective process for hydrocracking waste polyolefins into a spectrum of branched gasoline-range C5-12 hydrocarbons, utilizing a cerium-promoted Pt/HY as a metal-acid bifunctional catalyst. The HY zeolite was engineered with a hierarchical meso/microporosity and moderated acidity to alleviate the over cracking of intermediate hydrocarbons to light C(1-4 )gas products. The cerium presented as a surface cerium oxide phase, which mitigated acidity and significantly improved Pt dispersion. Upon a proper metal-acid balance, an optimized yield of C5-12 up to 85 wt % was achieved from the low-density polyethylene over a cerium-promoted Pt/HY catalyst at 280 C-degrees and 2 MPa H-2 for 2 h. The tandem catalysis was proposed to proceed with an initial dehydrogenation of the polymer chain over Pt sites, with subsequent isomerization and cracking over the Bronsted acid sites and hydrogenation of the olefin intermediates over Pt sites. The strong Pt-O-Ce bridging structure inhibited the migration and agglomeration of Pt atoms, affording good stability and no distinct performance loss over three sequential runs. This process is applicable to the hydrocracking of other polyolefins such as high-density polyethylene, polypropylene, and daily plastic bags to gasoline-range fuels in desirable yields (60-80 wt %).