Abstract Although considerable efforts towards directly converting syngas to liquid fuels through Fischer–Tropsch synthesis have been made, developing catalysts with low CO 2 selectivity for the synthesis of high‐quality gasoline remains a big challenge. Herein, we designed a bifunctional catalyst composed of hydrophobic FeNa@Si‐c and HZSM‐5 zeolite, which exhibited a low CO 2 selectivity of 14.3 % at 49.8 % CO conversion, with a high selectivity of 62.5 % for gasoline in total products. Molecular dynamic simulations and model experiments revealed that the diffusion of water molecules through hydrophilic catalyst was bidirectional, while the diffusion through hydrophobic catalyst was unidirectional, which were crucial to tune the water‐gas shift reaction and control CO 2 formation. This work provides a new fundamental understanding about the function of hydrophobic modification of catalysts in syngas conversion.

Water-gas shift reaction

10.1002/ange.202306786

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Citations (4)

Harnessing the Power of LLM to Support Binary Taint Analysis

arXiv (Cornell University) (2023)

Puzhuo Liu C. P. Sun Yaowen Zheng Xuan Feng Chuan Qin

This paper proposes LATTE, the first static binary taint analysis that is powered by a large language model (LLM). LATTE is superior to the state of the art (e.g., Emtaint, Arbiter, Karonte) in three aspects. First, LATTE is fully automated while prior static binary taint analyzers need rely on human expertise to manually customize taint propagation rules and vulnerability inspection rules. Second, LATTE is significantly effective in vulnerability detection, demonstrated by our comprehensive evaluations. For example, LATTE has found 37 new bugs in real-world firmware which the baselines failed to find, and 7 of them have been assigned CVE numbers. Lastly, LATTE incurs remarkably low engineering cost, making it a cost-efficient and scalable solution for security researchers and practitioners. We strongly believe that LATTE opens up a new direction to harness the recent advance in LLMs to improve vulnerability analysis for binary programs.

Taint checking

Firmware

Vulnerability

10.48550/arxiv.2310.08275

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Citations (6)

Promising Biosugarcane-Based Carbon Support for High Performance Iron-Based Fischer–Tropsch Synthesis

SSRN Electronic Journal (2021)

Jingyang Bai Chuan Qin Yanfei Xu Yixiong Du Guangyuan Ma

Exploiting new carbon supports with adjustable metal-support interaction and low price is of prime importance to realize the maximum active iron efficiency and industrial-scale application of Fe-based catalysts for Fischer−Tropsch synthesis (FTS). Herein, a simple, tunable and scalable biochar support with 3D hierarchical pore structure, deriving from the sugar cane bagasse, was successfully prepared and first for FTS. The metal-support interaction was precisely controlled by functional groups of the biosugarcane-based carbon material and different iron species sizes introduced by iron loadings. All catalysts synthesized displayed greatly high activities, and the FTY of Fe4/Cbio even reached 1198.9 μmol gFe−1s−1, remaining an excellent stability for 150 h. The superior performance was belong to the unique structure and characteristics of the biosugarcane-based carbon support, which possessed abundant C−O, C=O (η1(O) and η2(C, O)) functional groups, thus endowed the moderate metal-support interaction, high dispersion of active iron species, more active ε-Fe2C phase, and most importantly, high proportion of FexC/Fesurf, facilitating the maximum iron efficiency and intrinsic activity of the catalyst.

Fischer–Tropsch process

Carbon fibers

10.2139/ssrn.3811839

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Activated Nitrogen-Enriched Carbon/Reduced Expanded Graphite Composites for Supercapacitors

Advanced materials research (2011)

Shu Hui Tong Chuan Qin Zheng Jin Xue Song Wang Xu Bai

Activated nitrogen-enriched carbon/reduced expanded graphite composites (ANC/REG-c) with different composite ratio were prepared by in-situ polymerization, carbonization, activation and reduction of aniline and expanded graphite. These were characterized by XPS, SEM and electrochemical measurements. XPS shows that N atoms exist in the ANC and ANC/REG-c. Compared to mechanical mixture of ANC and REG(ANC/REG-m), ANC/REG-c shows lower resistance and higher C p1 (185.4 F/g) vs 124.3 F/g of ANC/REG-m measured by CV due to the introduction of the composite sturcture. When the composite ratio of ANC/REG-c is 6:1, the ANC/REG-c shows the highest C p1 (264.0 F/g) and its symmetric supercapacitor also shows the best synthetical electrochemical performances. The optimal supercapacitor presents good cycle stability. ANC/REG-c is a suitable electrode material for supercapacitors.

Carbon fibers

10.4028/www.scientific.net/amr.211-212.440

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Citations (2)

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

RSC Advances (2021)

Wei Zhang Yunhao Tang Wei Xiao Min Ruan Yanshan Yin

Probable surface NH 3 -SCR reaction mechanism over CuCe/TiO 2 -ZrO 2 catalyst is proposed to follow the E–R mechanism and the L–H mechanism, while the E–R mechanism dominates in the reaction and the oxidation of NO closes the catalytic cycle.

10.1039/d1ra06325a

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Citations (4)

Interactive Project Planning and Management Tool for Agile Software Development Teams

Chuan Qin

Software project management

Lean software development

Agile usability engineering

Scrum

Source

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Citations (0)

Insights into the Diffusion Behaviors of Water over Hydrophilic/Hydrophobic Catalysts During the Conversion of Syngas to High‐Quality Gasoline

Angewandte Chemie International Edition (2023)

Yanfei Xu Heng Liang Rui Li Zhenxuan Zhang Chuan Qin

Although considerable efforts towards directly converting syngas to liquid fuels through Fischer-Tropsch synthesis have been made, developing catalysts with low CO2 selectivity for the synthesis of high-quality gasoline remains a big challenge. Herein, we designed a bifunctional catalyst composed of hydrophobic FeNa@Si-c and HZSM-5 zeolite, which exhibited a low CO2 selectivity of 14.3 % at 49.8 % CO conversion, with a high selectivity of 62.5 % for gasoline in total products. Molecular dynamic simulations and model experiments revealed that the diffusion of water molecules through hydrophilic catalyst was bidirectional, while the diffusion through hydrophobic catalyst was unidirectional, which were crucial to tune the water-gas shift reaction and control CO2 formation. This work provides a new fundamental understanding about the function of hydrophobic modification of catalysts in syngas conversion.

Water-gas shift reaction

10.1002/anie.202306786

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Citations (17)

The Development and Adoption of Online Learning in Pre- and Post-COVID-19: Combination of Technological System Evolution Theory and Unified Theory of Acceptance and Use of Technology

Journal of risk and financial management (2021)

Ping Qiao Xiaoman Zhu Yangzhi Guo Ying Sun Chuan Qin

After the outbreak of COVID-19, schools heavily depend on e-learning technologies and tools to shift from in-person class to online. This review article analyzes the changes of technology evolution and technology adoption of e-learning in pre- and post-COVID-19 based on the Technology System Evaluation Theory (TSET) and technology adoption of e-learning based on the Unified Theory of Acceptance and Use of Technology (UTAUT). We intend to explore the interaction of technology evolution and technology adoption in the different focus of e-learning technology in the two stages and the particularity and heterogeneity of the UTAUT model. The results indicate that (1) The moderating results of technology evolution are proposed and evaluated under the UTAUT model before the COVID-19 outbreak. Studies after the COVID-19 pandemic paid more attention to technology efficiency rather than effectiveness; (2) Research on e-learning focuses on the infrastructure to reach more users after the outbreak of COVID-19 because e-learning is the only way to continue education; (3) COVID-19 fear moderates the relationship between the external factors and the behavior intention of e-learning users. The lack of financial support on technology evolution will directly weaken the implementation of new technology. Social Isolation offers more opportunities for students to engage in e-learning. Meanwhile, it slows down the implementation of e-learning because of out-to-date hardware and software. This article offers an enhanced understanding of the interaction of technology evolution and technology adoption under unexpected environments and provides practical insights into how to promote new technology in a way that users will accept and use easily. This study can be tested and extended by empirical research in the future.

Technological evolution

E-Learning

10.3390/jrfm14040162

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Citations (87)