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Effect of Steam Treatment on the Catalytic Performance of ZSM-5 in the co-conversion of Methanol and n-Hexane to Aromatics

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China Petroleum Processing & Petrochemical Technology 2024年第3期26卷 73-81页

作者： Wei Shumei Xu Yarong Yang Fan Zhu Kake Zhu Xuedong State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Research Institute of Urumqi Petrochemical company PetrochinaUrumqi 830019China

Steam pretreatment is a widely used method for modifying the acidity and structure of zeolites,thereby enhancing their catalytic *** study systematically investigated the effects of steam treatment on ZSM-5 zeolites at varying treatment temperatures and *** structural evolution of the catalysts was monitored using N2 adsorptiondesorption,X-ray diffraction,inductively coupled plasma optical emission spectroscopy,scanning electron microscopy,NH3 temperature-programmed desorption,in situ pyridine infrared spectroscopy,and thermogravimetric *** characterization results revealed that mesopores were introduced into the ZSM-5 zeolite catalysts through dealumination induced using steam treatment at moderate temperatures(400 and 500℃).Moreover,compared with the parent catalyst,the steam-treated catalysts exhibited a lower amount of acid sites and relative crystallinity,while the n(Si)/n(Al)ratio *** the co-conversion of methanol and n-hexane in a fixed bed reactor at 400℃and 0.5 MPa(N2 atmosphere),with a weight hourly space velocity of 1 h−1 and a stoichiometric ratio of 1:1(CH3OH to n-hexane),the steam-treated catalysts displayed a prolonged catalyst ***,the parent zeolite had a lifetime of 96 h,while the catalyst treated at 500℃for 12 h had a lifetime of up to 240 ***,the steam-treated catalysts maintained stable n-hexane conversion and improved aromatic ***,these treated catalysts exhibited a lower deactivation rate than the parent catalyst,and would be conducive to industrial scale-up production.

关键词： steam ZSM-5 zeolites co-conversion aromatization methanol n-hexane

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High‑Temperature Electrochemical Devices Based on Dense Ceramic Membranes for co_(2) conversion and Utilization

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Electrochemical Energy Reviews 2021年第3期4卷 518-544页

作者： Wenping Li Jing‑Li Luo Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada

The adverse effects of global warming and climate change have driven the exploration of feasible routes for co_(2) capture,storage,conversion and *** processes related to co_(2) conversion in high-temperature electrochemical devices(HTEDs)using dense ceramic membranes are particularly appealing due to the simultaneous realization of highly efficient co_(2) conversion and value-added chemical production as well as the generation of electricity and storage of renewable energy in some ***,most studies are focused on the two processes,co_(2) electrolysis and H2O/co_(2) co-electrolysis in oxygen-conducting solid oxide electrolysis cell(O-SOEC)*** attention has been paid to other meaningful co_(2)-conversion-related processes in HTEDs and systematic summary and analysis are currently not *** review will fill the gap and classify the co_(2)-conversion-related processes in HTEDs reported in recent years into four types accord-ing to the related reactions,including assisted co_(2) reduction to co,H2O and co_(2) co-conversion,dry reforming of methane and co_(2) ***,an overview of the fundamentals of HTED processes is presented,and then the related mechanism and research progress of each type of reactions in different HTEDs are elucidated and concluded *** remaining major technical issues are also briefly ***,the main challenges and feasible solutions as well as the future prospects of HTEDs for co_(2)-conversion-related processes are also discussed in this review.

关键词： Electrochemical devices High temperature co_(2)reduction co-conversion Dry reforming of methane co_(2)hydrogenation

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comparison of mitochondrial genomes provides insights into intron dynamics and evolution in the caterpillar fungus cordyceps militaris

Comparison of mitochondrial genomes provides insights into i...

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中国菌物学会2015年学术年会

作者： Yongjie Zhang Xingzhong Liu Chengshu Wang Jianping Xu School of Life Sciences Shanxi University State Key Laboratory of Mycology Institute of MicrobiologyChinese Academy of Sciences Institute of Plant Physiology and Ecology Shanghai Institutes for Biological SciencesChinese Academy of Sciences Department of Biology McMaster University

Intra-specific comparison of mitochondrial genomes can help elucidate the evolution of a species, however it has not been performed for hypocrealean fungi that form diverse symbiotic associations with other organisms. In this study, comparative analyses of three completely sequenced mitochondrial genomes of a hypocrealean fungus, cordyceps militaris, the type species of cordyceps genus, revealed that the introns were the main contributors to mitochondrial genome size variations among strains. Mitochondrial genes in C. militaris have been invaded by group I introns in at least eight positions. PCR assays of various C. militaris isolates showed abundant variations of intron presence/absence among strains at seven of the eight intronic loci. Although the ancestral intron pattern was inferred to contain all eight introns, loss and/or gain events occurred for seven of the eight introns. These introns invaded the C. militaris mitochondrial genome probably by horizontal transfer from other fungi, and intron insertions into intronless genes in C. militaris were accompanied by co-conversions of upstream exon sequences especially for those introns targeting protein-coding genes. We also detected phylogenetic congruence between the intron and exon trees at each individual locus, consistent with the ancestral mitochondria of C. militaris as having all eight introns. This study helps to explain the evolution of C. militaris mitochondrial genomes and will facilitate population genetic studies of this medicinally important fungus.

关键词： cordyceps militaris mitochondrial genome intron dynamics horizontal gene transfer co-conversion

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