Efficient and selective dual-pathway polyolefin hydro-conversion over unexpectedly bifunctional M/TiO2-anatase catalysts

نویسندگان

چکیده

The huge scale of plastic waste generation and its environmental consequences drive the demands for catalytic upcycling processes. Here, we report efficient polypropylene (PP) hydro-conversion over Ru Ni supported on a sol-gel anatase TiO2 (TiO2-A-SG). A small number Brønsted acid sites TiO2-A-SG enables hydrocracking, improving efficiency, steering selectivity towards high-valued C4-20, allowing more isomerization, compared to Ru-based monofunctional hydrogenolysis catalysts. relative contribution hydrocracking increases with lower hydrogen partial pressure, branched substrates, loading. Ni/TiO2-A-SG exhibits superior activity conventional Brønsted-acidic supports, particularly zeolites. Mechanistic studies shows fast isomerization sequential β-scissions caused by strong polymer-catalyst interaction cracking abundant 3C. This favors C4-12 formation prevents secondary reactions. work demonstrated novel, highly noble-metal-free catalyst upcycling, while advancing mechanistic understanding polyolefin hydro-conversion.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Selective Alkylation of Benzene by Propane over Bifunctional Pd-Acid Catalysts

The alkylation of benzene by propane to yield isopropylbenzene (iPrPh) was studied using bifunctional Pd-acid catalysts, such as Pd-heteropoly acid and Pd-zeolite, in a fixed bed reactor at 300 ◦C and 1 bar pressure. Keggin-type tungstosilicic acid H4SiW12O40 (HSiW) and zeolite HZSM-5 were used as the acid components in these catalysts. The reaction occurred most efficiently over 2%Pd/25%HSiW/S...

متن کامل

Selective oxidation of methanol to dimethoxymethane over bifunctional VO(x)/TS-1 catalysts.

This communication describes the design of bifunctional VO(x)/TS-1 catalysts with enhanced redox and acidic character via doping SO(4)(2-) and PO(4)(3-) for selective oxidation of methanol to dimethoxymethane. Redox sites enable the production of formaldehyde, while acidic sites favor the condensation of formaldehyde to DMM.

متن کامل

Selective Gas-Phase Conversion of Glycerol to Acetol Over Promoted Zirconia Solid Acid Catalysts

The vapour phase selective conversion of glycerol to acetol at normal atmospheric pressure in a fixed-bed micro reactor was investigated over SO4 2 and WOx promoted ZrO2 and M-ZrO2 (M = Al2O3 or TiO2) solid acid catalysts. The investigated sulfate and tungstate ion promoted zirconia-based catalysts were prepared by both coprecipitation and impregnation methods and calcined at 923 K. The synthes...

متن کامل

Nanoporous Composites as Bifunctional Catalysts

Title of Document: SYNTHESIS OF ZEOLITE@MOF NANOPOROUS COMPOSITES AS BIFUNCTIONAL CATALYSTS Guanghui Zhu, Master of Science, 2014 Directed By: Professor, Dr. Dongxia Liu, Department of Chemical and Biomolecular Engineering And Professor, Dr. Kyu Yong Choi, Department of Chemical and Biomolecular Engineering As nanoporous materials, zeolite and metal organic framework (MOF) share common characte...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Applied Catalysis B-environmental

سال: 2023

ISSN: ['1873-3883', '0926-3373']

DOI: https://doi.org/10.1016/j.apcatb.2023.122897