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A mixed matrix membrane for enhanced CO2/N2 separation via aligning hierarchical porous zeolite with a polyethersulfone based comb-like polymer

https://doi.org/10.1016/j.jtice.2021.10.032

Yu, Yunfei ; Zhang, Chenchen ; Fan, Jiufeng ; Liu, Dongxia ; Meng, Jianqiang ( March 2022 , Journal of the Taiwan Institute of Chemical Engineers)

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Direct Non‐Oxidative Methane Conversion in a Millisecond Catalytic Wall Reactor

https://doi.org/10.1002/anie.201903000

Oh, Su Cheun ; Schulman, Emily ; Zhang, Junyan ; Fan, Jiufeng ; Pan, Ying ; Meng, Jianqiang ; Liu, Dongxia ( April 2019 , Angewandte Chemie International Edition)

Abstract
Direct non‐oxidative methane conversion (DNMC) has been recognized as a single‐step technology that directly converts methane into olefins and higher hydrocarbons. High reaction temperature and low catalyst durability, resulting from the endothermic reaction and coke deposition, are two main challenges. We show that a millisecond catalytic wall reactor enables stable methane conversion, C₂₊selectivity, coke yield, and long‐term durability. These effects originate from initiation of the DNMC on a reactor wall and maintenance of the reaction by gas‐phase chemistry within the reactor compartment. The results obtained under various temperatures and gas flow rates form a basis for optimizing the process towards lighter C₂or heavier aromatic products. A process simulation was done by Aspen Plus to understand the practical implications of this reactor in DNMC. High carbon and thermal efficiencies and low cost of the reactor materials are realized, indicating the technoeconomic viability of this DNMC technology.

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Direct Non‐Oxidative Methane Conversion in a Millisecond Catalytic Wall Reactor

https://doi.org/10.1002/ange.201903000

Oh, Su Cheun ; Schulman, Emily ; Zhang, Junyan ; Fan, Jiufeng ; Pan, Ying ; Meng, Jianqiang ; Liu, Dongxia ( April 2019 , Angewandte Chemie)

Abstract
Direct non‐oxidative methane conversion (DNMC) has been recognized as a single‐step technology that directly converts methane into olefins and higher hydrocarbons. High reaction temperature and low catalyst durability, resulting from the endothermic reaction and coke deposition, are two main challenges. We show that a millisecond catalytic wall reactor enables stable methane conversion, C₂₊selectivity, coke yield, and long‐term durability. These effects originate from initiation of the DNMC on a reactor wall and maintenance of the reaction by gas‐phase chemistry within the reactor compartment. The results obtained under various temperatures and gas flow rates form a basis for optimizing the process towards lighter C₂or heavier aromatic products. A process simulation was done by Aspen Plus to understand the practical implications of this reactor in DNMC. High carbon and thermal efficiencies and low cost of the reactor materials are realized, indicating the technoeconomic viability of this DNMC technology.

more » « less