One-pass selective conversion of syngas to para-xylene

Abstract

We presented a promising hybrid catalyst, named Cr/Zn–Zn/Z5@S1, to effectively realize the one-pass selective conversion of syngas to para-xylene.

Direct and Oriented Conversion of CO2 into Value‐Added Aromatics

“…The methanol/DME‐mediated pathway for tandem catalytic conversion of CO 2 into hydrocarbons is accomplished over a bifunctional catalyst possessing active sites for both methanol synthesis and the conversion of methanol into hydrocarbons . A successful oriented conversion of methanol into PX would facilitate direct conversion of CO 2 into PX in a single pass, but this has not hitherto been reported …”

“…[8] As uccessful oriented conversion of methanol into PX would facilitate direct conversiono f CO 2 into PX in as ingle pass, but this has not hitherto been reported. [9] The vital factor for the direct conversion of CO 2 into BTX, especially PX, is precise regulation of the chemical properties of H-ZSM-5. During the traditional methanol-to-aromatics (MTA) process, BTX formed within the micropores of H-ZSM-5 is inevitably alkylated to heavy aromatics during itsd iffusion to the externals urfaceo ft he zeolite.…”

Ceria‐Zirconia/Zeolite Bifunctional Catalyst for Highly Selective Conversion of Syngas into Aromatics

“…In addition, a 73.9 % selectivity to aromatics can be reached over the ZnCrO x /HZSM‐5 bifunctional catalyst at a reaction pressure of 4.0 MPa . Furthermore, by decorating a Zn‐modified ZSM‐5 with Silicalite‐1 shell, the selectivity to p ‐xylene can be significantly improved in the present of ZnCr 2 O 4 spinel …”

“…[6a] Furthermore, by decorating a Zn-modified ZSM-5 with Silicalite-1 shell, the selectivity to p-xylene can be significantly improved in the present of ZnCr 2 O 4 spinel. [7] The surface oxygen vacancies of metal oxides have been considered as sites for CÀO bond activation, where *C species can be formed and afterwards removed by hydrogenation in the presence of H 2 in the form of hydrocarbons or oxygenates as intermediates for the formation of olefins and aromatics on the acidic sites of zeolites. [1b,2c] Therefore, the oxygen vacancy should play a vital role during the direct conversion of syngas on these bifunctional catalysts.…”

Effect of the Post‐Treatment of HZSM‐5 on Catalytic Performance for Methanol to Aromatics

“…Table shows the data of IR spectra of pyridine adsorption for catalysts. The total amount of B acid sites was obviously decreased by surface‐passivation and hydrothermal treatment, which might be due to the neutralization of the B acid center on the outer surface of the HZSM‐5‐0.09 M‐1 M by the basic group on the organosilane . Compared to the HZSM‐5‐0.09 M‐1 M, the amount of L acid sites for Si/HZSM‐5‐0.09 M‐1M T increased, which may be due to the fact that some Al species in the zeolite lattice migrate from the skeleton to non‐skeleton Al, forming L acid sites during the process of hydrothermal treatment …”