Low-temperature synthesis of α-alumina nanosheets on microfibrous-structured Al-fibers for Pd-catalyzed CO oxidative coupling to dimethyl oxalate

Abstract

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Highly Effective Pd/MgO/γ-Al2O3 Catalysts for CO Oxidative Coupling to Dimethyl Oxalate: The Effect of MgO Coating on γ-Al2O3

“…Dimethyl oxalate (DMO) is an important chemical raw material used to synthesize various significant chemical products such as oxamide, oxalate acid, and methyl glycolate. , More importantly, ethylene glycol (EG) is synthesized by hydrogenation of DMO and is an important chemical used in polyester manufacturing and as an antifreezer. − Commercial production of EG is mainly from ethylene oxidation. With shrinking sources of petroleum, synthesis of EG from coal called coal to EG (CTEG) has been attracting increasing interest. , The CTEG includes two processes: (1) 2CO + 2CH 3 ONO → (COOCH 3 ) 2 + 2NO, with CO derived from synthesis gas oxidative coupling with methyl nitrite (MN) to DMO and (2) (COOCH 3 ) 2 + 4H 2 → (CH 2 OH) 2 + 2CH 3 OH, hydrogenation of DMO to EG. Process (1), gas-phase CO oxidative coupling with MN to DMO, is an important process in CTEG, which can convert inorganic C1 to organic C2. , …”

“…With shrinking sources of petroleum, synthesis of EG from coal called coal to EG (CTEG) has been attracting increasing interest. 7,8 The CTEG includes two processes: (1) 2CO + 2CH 3 ONO → (COOCH 3 ) 2 + 2NO, with CO derived from synthesis gas oxidative coupling with methyl nitrite (MN) to DMO and (2) (COOCH 3 ) 2 + 4H 2 → (CH 2 OH) 2 + 2CH 3 OH, hydrogenation of DMO to EG. Process (1), gas-phase CO oxidative coupling with MN to DMO, is an important process in CTEG, which can convert inorganic C1 to organic C2.…”

Theoretical exploration of the origin of selectivity for the oxidative carbonylation reaction catalyzed by a single Pd atom embedded on graphene

“…Our above theoretical findings are quite consistent with the experimental observation that surfaces with weaker acidities, such as α-Al 2 O 3 , have higher catalytic activity for DMO and that, conversely, surfaces with higher acidities favor DMC production (γ-Al 2 O 3 ). 23,53…”

Recent advances in the routes and catalysts for ethanol synthesis from syngas

“…Wang et al 334 synthesized α-Al 2 O 3 nanosheets on Al-fibers, to support the active Pd component for DMO synthesis via methanol coupling with CO. The experiential results showed that the Pd, loaded on α-Al 2 O 3 nanosheets, possessed excellent catalytic performance for the DMO synthesis.…”

“…Prior to the impregnation, the Al-fiber was etched using NaOH (0.1 wt%) aqueous solution. Wang et al 334 pretreated Al-fibers in a quartz tube, and oxidized in steam at 393 K for 6 h, to form α-Al 2 O 3 nanosheets on the microfibrous-structured Al-fibers. Then, the active Pd component was impregnated by the wet impregnation method.…”