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219 results on '"Bu, Quan"'

28. Establishment of an efficient and accurate thermal stability evaluation method based on machine vision and its application in PVC thermal degradation.

Author

Wang, Mei, Wang, Guanglin, Fan, Xinzhu, Song, Xianghai, Zhou, Bingliang, Bu, Quan, and Yuan, Shouqi

Subjects
THERMAL stability, COMPUTER vision, EVALUATION methodology, CONGO red (Staining dye), TEST methods
Abstract

Efficiency and accuracy are two major criteria for evaluating a test method. The thermal stability evaluation of PVC materials is now mainly based on the color change of PVC samples and Congo red test paper with manual observation as the main method, which is inefficient and imprecise. In this work, a machine vision-based evaluation system was developed to address the issues of low efficiency and poor accuracy in evaluating PVC thermal stability. During the degradation process, the color change recognition characteristics of PVC film samples and Congo red test paper were determined by analyzing the RGB SUM value and the R value, respectively. In comparison to manual observation, the machine vision-based evaluation system is more objective, efficient and accurate, and it is particularly suitable for evaluating PVC samples with similar thermal stability. Moreover, this study also resolves the issue of color mutation during the window period of the thermal stability test, and obtains the thermal degradation evolution trend through the color value change curve. This method holds great importance and application potential in guiding the processing or reprocessing of PVC materials. [ABSTRACT FROM AUTHOR]

Published
2023
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31. Preparation and Application of Carbon-Based Materials in the Production of Medium-Chain Carboxylic Acids by Anaerobic Digestion: A Review.

Author

Jiao, Lihua, Liu, Yang, Cao, Chunhui, Bu, Quan, Liu, Mingqing, and Xi, Yonglan

Subjects
CARBON-based materials, ANAEROBIC digestion, CARBON nanofibers, ELECTRON donors, ELECTROPHILES, FACTORS of production, CARBOXYLIC acids
Abstract

The main purpose of this article is to explore the mechanism of action of carbon-based materials in the anaerobic digestion (AD) production of medium-chain carboxylic acids (MCCA). Currently, there are various methods to increase production, but there is no review on how carbon-based materials improve MCCA. This paper first introduced the chain elongation (CE) technology, focusing on the factors affecting the production of MCCA by AD, such as pH, temperature, the ratio of electron donor (ED) to an electron acceptor (EA), substrate type, and other related factors. This article introduces the preparation and characteristics of carbon-based materials, as well as the effect and mechanism of adding carbon-based materials to AD acid production. Finally, the shortcomings of the current research were pointed out, and future research directions were prospected, aiming to provide a reference for improving the efficiency of AD of MCCA using carbon-based materials. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Microwave-Assisted Catalytic Conversion of 5-HMF for Biofuel Additives by Molybdophosphoric Acid Encapsulated KCC-1.

Author

Vasudevan, Srinivasan Vinju, Cai, Jin, Xu, Junming, Lin, Hongjian, Wang, Hongliang, and Bu, Quan

Subjects
PHOSPHOMOLYBDIC acid, BIOMASS energy, ETHERIFICATION, X-ray diffraction, FURFURAL, CATALYSTS
Abstract

In this work, the microwave-assisted reaction of 5-hydroxymethylfurfural (5-HMF) into valuable ether and acylated production formation was investigated with the help of molybdophosphoric acid encapsulated dendritic fibrous silica (KCC-1) as a catalyst. XRD, N2 adsorption-desorption, SEM, FT-IR, NH3-TPD, and TEM were used to analyze the physicochemical and structural properties of the synthesized catalysts. The microwave etherification of 5-HMF with ethanol was tested using synthesized catalysts. The effects of the reaction temperature, reaction time, catalytic amount, and microwave power were investigated. The resulting MPA-KCC-1 and IMPA-KCC-1 catalysts demonstrated excellent activity for the etherification of 5-HMF with ethanol, producing 5-(hydroxymethyl) furfural diethyl acetal (HMFDEA) and 5-(ethoxymethyl)furfural diethyl acetal (EMFDEA) products selectively. The significant advantages of the work are the selective production of EMFDEA at 82%, the catalyst can be easily removed via filtration, and the catalyst activity remains nearly intact even after five reaction cycles. [ABSTRACT FROM AUTHOR]

Published
2023
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