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Tianlin Ma,Manyun Yin,Chunyang Su,Ningfei Guo,Xiangxiang Huang,Zhen Han,Yujie Wang,Gangling Chen,Zhi Yun 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
The surplus production of glycerol as a byproduct of biodiesel has become an urgent problem for the sustainabilityof the biodiesel industry. The catalytic transformation of glycerol to value-added chemicalshas attracted the attention of researchers worldwide over the last decade. Among them, selective dehydrationof glycerol to acrolein has gained interest from both academic researchers and industrial applications. Molecular sieves have been considered as the most promising catalysts for industrialapplications of glycerol dehydration. However, there is no systematic summary for the research carriedout for this reaction over molecular sieve catalysts. This work provides a comprehensive and criticalreview of glycerol dehydration to acrolein over molecular sieve catalysts, including ZSM-5, ZSM-11,MCM-22, MCM-41, SBA-15, SAPO-34, HY and Hb. The key technical problems that restrict its industrialapplication are the easy coking and poor stability of the molecular sieves. In particular, the pore size, porestructure, acid amount, acid strength, acid type and reaction conditions that influence the dehydrationperformance are discussed in detail. Furthermore, the reaction mechanism, reaction kinetics, reactionthermodynamics and future research directions for catalyst design and engineering are also presented. This review will deepen our understanding of the catalytic dehydration of glycerol to acrolein and provideguidance for researchers on the rational design of molecular sieve catalysts.
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The optimum steel fiber reinforcement for prestressed concrete containment under internal pressure
Zhi Zheng,Ye Sun,Xiaolan Pan,Chunyang Su,Jingchang Kong 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6
This paper investigates the optimum fiber reinforcement for prestressed concrete containment vessels(PCCVs) under internal pressure. To achieve this aim, steel fiber, which is the most widely used fiber typein current engineering applications, is adopted to constitute steel fiber-reinforced concrete (SFRC) tosubstitute the conventional concrete in the PCCV. The effects of characteristic parameters, lsf , of the steelfiber affecting significantly the mechanical behavior of the concrete are first taken into account. Partial orcomplete concrete regions of the PCCV are also considered to be replaced by SFRC to balance theeconomy and safety. By adopting the ABAQUS software, the ultimate bearing capacity and performancefor the fiber-reinforced PCCV are scientifically studied and quantified, and the recommendations for theoptimum way of fiber reinforcement are presented.
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Zhi Zheng,Yong Wang,Shuai Huang,Xiaolan Pan,Chunyang Su,Ye Sun Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6
Following a loss of coolant accident (LOCA), prestressing concrete containment vessels (PCCVs) may experience high thermal load as well as internal pressure. The high temperature stress would increase the risk of premature damage to the containment, which reduces the safety margin during the increasing internal pressure. However, current investigations cannot clearly address the issues of thermal-pressure coupling effect on damage propagation and thus safety of the containment. Thus, this paper offers three simple and powerful damage parameters to differentiate the severity of damage of the containment. Moreover, despite of the temperature action severely threatening the pressure performance of the containment, the research regarding the improvement of the resistant performance of the containment is quite scarce. Therefore, in this paper, a comprehensive comparison of damage propagation and mechanism between conventional and fiber-reinforced concrete (FRC) containments is performed. The effects of fiber characteristics parameters on damage propagation of structures following the LOCA are also specifically revealed. It is found that the proposed damage indices can properly indicate state of damage in the containment body and the addition of fiber can be used to obviously mitigate the damage propagation in PCCV considering the thermal-pressure coupling.
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